Added TZ_LINK_INTL option

2025-06-15 03:54:09 +02:00
parent dee5dca459
commit 25c6aaec18
70 changed files with 48094 additions and 4 deletions
--- a/.gitmodules
+++ b/.gitmodules
@@ -31,9 +31,6 @@
 [submodule "libadrenotools"]
 	path = externals/libadrenotools
 	url = https://github.com/bylaws/libadrenotools.git
-[submodule "tzdb_to_nx"]
-	path = externals/nx_tzdb/tzdb_to_nx
-	url = https://github.com/lat9nq/tzdb_to_nx.git
 [submodule "simpleini"]
 	path = externals/simpleini
 	url = https://github.com/brofield/simpleini.git
--- a/externals/nx_tzdb/tzdb_to_nx
+++ b/externals/nx_tzdb/tzdb_to_nx
--- a/externals/nx_tzdb/tzdb_to_nx/.github/workflows/cmake.yml
+++ b/externals/nx_tzdb/tzdb_to_nx/.github/workflows/cmake.yml
@@ -0,0 +1,52 @@
+name: CMake
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+    # The CMake configure and build commands are platform agnostic and should work equally well on Windows or Mac.
+    # You can convert this to a matrix build if you need cross-platform coverage.
+    # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
+    strategy:
+      matrix:
+        platform: [ubuntu-latest,macos-latest]
+    runs-on: ${{ matrix.platform }}
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: 'true'
+
+    - name: Configure CMake
+      # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
+      # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
+      run: |
+        cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
+        echo "nx_tzdb_dir=$(grep NX_TZDB_DIR ${{github.workspace}}/build/CMakeCache.txt | sed 's/.*=//g')" > "$GITHUB_ENV"
+
+    - name: Build
+      # Build your program with the given configuration
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} --target x80e
+      
+    - name: Package
+      run: |
+        mkdir -p ${{github.workspace}}/artifacts
+        cp -Rv ${{ env.nx_tzdb_dir }} ${{github.workspace}}/artifacts/
+        
+    - name: Version
+      run: |
+        echo "nx_version=$(cat ${{ env.nx_tzdb_dir }}/version.txt)" > "$GITHUB_ENV"
+      
+    - name: Upload
+      uses: actions/upload-artifact@v3
+      with:
+        name: ${{ env.nx_version }}_${{ matrix.platform }}
+        path: artifacts/nx
--- a/externals/nx_tzdb/tzdb_to_nx/.gitignore
+++ b/externals/nx_tzdb/tzdb_to_nx/.gitignore
@@ -0,0 +1,2 @@
+.cache
+build
--- a/externals/nx_tzdb/tzdb_to_nx/.gitmodules
+++ b/externals/nx_tzdb/tzdb_to_nx/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "externals/tz/tz"]
+	path = externals/tz/tz
+	url = https://github.com/eggert/tz.git
--- a/externals/nx_tzdb/tzdb_to_nx/CMakeLists.txt
+++ b/externals/nx_tzdb/tzdb_to_nx/CMakeLists.txt
@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.10)
+
+project(tzdb2nx VERSION 1.0)
+
+option(TZDB2NX_ZONEINFO_DIR "Specify a custom zoneinfo directory containing time zone data you wish to use" "")
+option(TZDB2NX_VERSION "Specify a custom zoneinfo version with the directory" "")
+
+if (TZDB2NX_ZONEINFO_DIR AND NOT TZDB2NX_VERSION)
+    message(FATAL_ERROR "TZDB2NX_ZONEINFO_DIR was specified but TZDB2NX_VERSION was left undefined.")
+endif()
+
+set(CMAKE_CXX_STANDARD 20)
+
+option(TZ_LINK_INTL "Enable if gettext needs to link with libintl" ${APPLE})
+
+if (TZ_LINK_INTL)
+    find_package(Intl REQUIRED)
+endif()
+
+add_subdirectory(externals)
+add_subdirectory(src)
--- a/externals/nx_tzdb/tzdb_to_nx/CMakeModules/list_directory.cmake
+++ b/externals/nx_tzdb/tzdb_to_nx/CMakeModules/list_directory.cmake
@@ -0,0 +1,10 @@
+set(WITH_DIRECTORIES ${CMAKE_ARGV3})
+set(RECURSE ${CMAKE_ARGV4})
+
+set(HOW_TO_GLOB "GLOB")
+if (RECURSE)
+    set(HOW_TO_GLOB "GLOB_RECURSE")
+endif()
+
+file(${HOW_TO_GLOB} FILE_LIST LIST_DIRECTORIES ${WITH_DIRECTORIES} RELATIVE ${CMAKE_SOURCE_DIR} "*")
+execute_process(COMMAND ${CMAKE_COMMAND} -E echo "${FILE_LIST};")
--- a/externals/nx_tzdb/tzdb_to_nx/LICENSE
+++ b/externals/nx_tzdb/tzdb_to_nx/LICENSE
@@ -0,0 +1,21 @@
+ The MIT License (MIT)
+
+Copyright © 2023 lat9nq
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the “Software”), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/externals/nx_tzdb/tzdb_to_nx/README.md
+++ b/externals/nx_tzdb/tzdb_to_nx/README.md
@@ -0,0 +1,22 @@
+# tzdb_to_nx
+
+This is a CMake/C++ project to convert RFC 8536 time zone data to the Nintendo Switch's format.
+This makes use a lot of Unix system calls as well as a bash script to convert the data, so it likely requires a bit of work to port to a non-POSIX platform, such as Windows.
+
+Intended for use with the [yuzu Emulator](https://yuzu-emu.org/) project, but the project in the future likely won't ship synthesized Switch archives.
+That leaves this project in a place where it is not likely to be used, but will remain here as a reference.
+
+- tzdb: CMake and bash script to build and convert time zone data from https://www.iana.org/time-zones into the Nintendo Switch's format.
+- tzdb2nx: C++ program that converts a single tzif file to the Nintendo's format.
+
+The fine folks over at [SwitchBrew](https://switchbrew.org/wiki/PSC_services#ITimeZoneService) have left very helpful information on reading the data.
+Nintendo's file is simply the TZif version 2 data, with standard_indicators and ut_indicators data stripped out (and the necessary modifications needed in the header to make the data valid).
+This means the TZif 1 data is not present, so essentially we are left with the second half of each file.
+
+Nintendo also does not seem to run the `zic` program on their output when they build the time zone data.
+I have left the relevant build command for that in src/tzdb/CMakeLists.txt commented out, but it isn't used here.
+This lets the project produce data identical to Nintendo's firmware for time zones, however this code does not produce the time zone data on US/Pacific-New or America/East-Saskatchewan (I may have bunged up the actual paths for these as this is 3 day old memory).
+
+The CMake and C++ code in this repository is licensed under the MIT License.
+The source files date.c, newstrftime.3 and strftime.c from submodule eggert/tz use the BSD-3 clause license [[source]](https://github.com/eggert/tz/blob/main/LICENSE).
+The time zone data output from this repository, like those found in archives in the Release setcion, is in the public domain [[source]](https://github.com/eggert/tz/blob/main/LICENSE).
--- a/externals/nx_tzdb/tzdb_to_nx/externals/CMakeLists.txt
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(tz)
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/CMakeLists.txt
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/CMakeLists.txt
@@ -0,0 +1,73 @@
+set(TZ_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/tz" CACHE PATH "Time zone source directory")
+set(TZ_DIR "${CMAKE_CURRENT_BINARY_DIR}/tz")
+set(TZ_TMP_SOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}/tmpsrc")
+set(TZIF_LIST_FILE "${CMAKE_CURRENT_BINARY_DIR}/tzif_list.txt" CACHE PATH "List of zone info files")
+if (TZDB2NX_ZONEINFO_DIR)
+    set(TZ_ZONEINFO_DIR "${TZDB2NX_ZONEINFO_DIR}" CACHE PATH "Time zone info data directory")
+else()
+    set(TZ_ZONEINFO_DIR "${TZ_DIR}/usr/share/zoneinfo" CACHE PATH "Time zone info data directory")
+endif()
+
+find_program(GNU_MAKE make)
+if (NOT GNU_MAKE)
+    message(FATAL_ERROR "GNU make not found")
+endif()
+
+if (NOT EXISTS "${TZ_DIR}" OR NOT EXISTS "${TZIF_LIST_FILE}")
+    if (NOT TZDB2NX_ZONEINFO_DIR) # If a custom zoneinfo directory was specified
+        # tz's makefile can only build in-tree, so copy the whole source tree to a
+        # separate directory before building.
+        execute_process(
+            COMMAND
+                ${CMAKE_COMMAND} -E copy_directory "${TZ_SOURCE_DIR}" "${TZ_TMP_SOURCE_DIR}"
+            COMMAND_ERROR_IS_FATAL ANY
+        )
+
+        if (TZ_LINK_INTL)
+            set(TZ_MAKEFLAGS "LDLIBS=${Intl_LIBRARY}")
+        else()
+            set(TZ_MAKEFLAGS)
+        endif()
+
+        execute_process(
+            COMMAND
+                ${GNU_MAKE} DESTDIR=${TZ_DIR} ${TZ_MAKEFLAGS} install
+            WORKING_DIRECTORY 
+                ${TZ_TMP_SOURCE_DIR}
+            COMMAND_ERROR_IS_FATAL ANY
+        )
+
+        unset(TZ_MAKEFLAGS)
+
+        # Step taken by Arch Linux packaging, but Nintendo apparently skips it
+        # execute_process(
+        #     COMMAND
+        #         "${TZDB_LOCATION}/zic" -b fat -d ${TZDB_ZONEINFO} africa antarctica asia australasia europe northamerica southamerica etcetera backward factory
+        #     WORKING_DIRECTORY
+        #         "${TZDB_LOCATION}"
+        #     COMMAND_ERROR_IS_FATAL ANY
+        # )
+    endif()
+
+    execute_process(
+        COMMAND
+           ${CMAKE_COMMAND} -P ${PROJECT_SOURCE_DIR}/CMakeModules/list_directory.cmake false ON
+        WORKING_DIRECTORY
+            "${TZ_ZONEINFO_DIR}"
+        OUTPUT_VARIABLE
+            TZIF_SCAN
+    )
+
+    set(TZIF_LIST "")
+    foreach(CANDIDATE ${TZIF_SCAN})
+        if (CANDIDATE STREQUAL "\n")
+            continue()
+        endif()
+        set(TZIF_FILE "${TZ_ZONEINFO_DIR}/${CANDIDATE}")
+        file(READ "${TZIF_FILE}" HEADER LIMIT 4)
+        string(SUBSTRING "${HEADER}" 0 4 HEADER) # Remove trailing newline
+        if (HEADER STREQUAL "TZif")
+            file(APPEND "${TZIF_LIST_FILE}" "${TZIF_FILE}\n")
+        endif()
+    endforeach()
+endif()
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/.gitignore
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/.gitignore
@@ -0,0 +1,26 @@
+# Files intentionally not tracked by Git.
+# This file is in the public domain.
+*.a
+*.asc
+*.diff
+*.i
+*.o
+*.orig
+*.patch
+*.rej
+*.tar
+*.tar.*
+*.txt
+*.tzs
+*.zi
+*~
+ChangeLog
+check_*
+date
+leapseconds
+tzselect
+version
+version.h
+yearistype
+zdump
+zic
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/CONTRIBUTING
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/CONTRIBUTING
@@ -0,0 +1,97 @@
+# Contributing to the tz code and data
+
+Please do not create issues or pull requests on GitHub, as the
+proper procedure for proposing and distributing patches is via
+email as described below.
+
+The time zone database is by no means authoritative: governments
+change timekeeping rules erratically and sometimes with little
+warning, the data entries do not cover all of civil time before
+1970, and undoubtedly errors remain in the code and data.  Feel
+free to fill gaps or fix mistakes, and please email improvements
+to <tz@iana.org> for use in the future.  In your email, please give
+reliable sources that reviewers can check.
+
+## Contributing technical changes
+
+To email small changes, please run a POSIX shell command like
+'diff -u old/europe new/europe >myfix.patch', and attach
+'myfix.patch' to the email.
+
+For more-elaborate or possibly-controversial changes,
+such as renaming, adding or removing zones, please read
+"Theory and pragmatics of the tz code and data"
+<https://www.iana.org/time-zones/repository/theory.html>.
+It is also good to browse the mailing list archives
+<https://mm.icann.org/pipermail/tz/> for examples of patches that tend
+to work well.  Additions to data should contain commentary citing
+reliable sources as justification.  Citations should use "https:" URLs
+if available.
+
+For changes that fix sensitive security-related bugs, please see the
+distribution's 'SECURITY' file.
+
+Please submit changes against either the latest release
+<https://www.iana.org/time-zones> or the main branch of the development
+repository.  The latter is preferred.
+
+## Sample Git workflow for developing contributions
+
+If you use Git the following workflow may be helpful:
+
+  * Copy the development repository.
+
+        git clone https://github.com/eggert/tz.git
+        cd tz
+
+  * Get current with the main branch.
+
+        git checkout main
+        git pull
+
+  * Switch to a new branch for the changes.  Choose a different
+    branch name for each change set.
+
+        git checkout -b mybranch
+
+  * Sleuth by using 'git blame'.  For example, when fixing data for
+    Africa/Sao_Tome, if the command 'git blame africa' outputs a line
+    '2951fa3b (Paul Eggert 2018-01-08 09:03:13 -0800 1068) Zone
+    Africa/Sao_Tome 0:26:56 - LMT 1884', commit 2951fa3b should
+    provide some justification for the 'Zone Africa/Sao_Tome' line.
+
+  * Edit source files.  Include commentary that justifies the
+    changes by citing reliable sources.
+
+  * Debug the changes, e.g.:
+
+        make check
+        make install
+        ./zdump -v America/Los_Angeles
+
+  * For each separable change, commit it in the new branch, e.g.:
+
+        git add northamerica
+        git commit
+
+    See recent 'git log' output for the commit-message style.
+
+  * Create patch files 0001-..., 0002-..., ...
+
+        git format-patch main
+
+  * After reviewing the patch files, send the patches to <tz@iana.org>
+    for others to review.
+
+        git send-email main
+
+    For an archived example of such an email, see
+    "[PROPOSED] Fix off-by-1 error for Jamaica and T&C before 1913"
+    <https://mm.icann.org/pipermail/tz/2018-February/026122.html>.
+
+  * Start anew by getting current with the main branch again
+    (the second step above).
+
+-----
+
+This file is in the public domain.
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/LICENSE
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/LICENSE
@@ -0,0 +1,5 @@
+Unless specified below, all files in the tz code and data (including
+this LICENSE file) are in the public domain.
+
+If the files date.c, newstrftime.3, and strftime.c are present, they
+contain material derived from BSD and use the BSD 3-clause license.
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/Makefile
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/Makefile
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/NEWS
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/NEWS
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/README
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/README
@@ -0,0 +1,52 @@
+README for the tz distribution
+
+"Where do I set the hands of the clock?" -- Les Tremayne as The King
+"Oh that--you can set them any place you want." -- Frank Baxter as The Scientist
+					(from the Bell System film "About Time")
+
+The Time Zone Database (called tz, tzdb or zoneinfo) contains code and
+data that represent the history of local time for many representative
+locations around the globe.  It is updated periodically to reflect
+changes made by political bodies to time zone boundaries, UTC offsets,
+and daylight-saving rules.
+
+See <https://www.iana.org/time-zones/repository/tz-link.html> or the
+file tz-link.html for how to acquire the code and data.  Once acquired,
+read the comments in the file 'Makefile' and make any changes needed
+to make things right for your system, especially if you are using some
+platform other than GNU/Linux.  Then run the following commands,
+substituting your desired installation directory for "$HOME/tzdir":
+
+	make TOPDIR=$HOME/tzdir install
+	$HOME/tzdir/usr/bin/zdump -v America/Los_Angeles
+
+See the file tz-how-to.html for examples of how to read the data files.
+
+This database of historical local time information has several goals:
+
+ * Provide a compendium of data about the history of civil time that
+   is useful even if not 100% accurate.
+
+ * Give an idea of the variety of local time rules that have existed
+   in the past and thus may be expected in the future.
+
+ * Test the generality of the local time rule description system.
+
+The information in the time zone data files is by no means authoritative;
+fixes and enhancements are welcome.  Please see the file CONTRIBUTING
+for details.
+
+Thanks to these Time Zone Caballeros who've made major contributions to the
+time conversion package: Keith Bostic; Bob Devine; Paul Eggert; Robert Elz;
+Guy Harris; Mark Horton; John Mackin; and Bradley White.  Thanks also to
+Michael Bloom, Art Neilson, Stephen Prince, John Sovereign, and Frank Wales
+for testing work, and to Gwillim Law for checking local mean time data.
+Thanks in particular to Arthur David Olson, the project's founder and first
+maintainer, to whom the time zone community owes the greatest debt of all.
+None of them are responsible for remaining errors.
+
+-----
+
+This file is in the public domain, so clarified as of 2009-05-17 by
+Arthur David Olson.  The other files in this distribution are either
+public domain or BSD licensed; see the file LICENSE for details.
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/SECURITY
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/SECURITY
@@ -0,0 +1,15 @@
+Please report any sensitive security-related bugs via email to the
+tzdb designated coordinators, currently Paul Eggert
+<eggert@cs.ucla.edu> and Tim Parenti <tim@timtimeonline.com>.
+Put "tzdb security" at the start of your email's subject line.
+We prefer communications to be in English.
+
+You should receive a response within a week. If not, please follow up
+via email to make sure we received your original message.
+
+If we confirm the bug, we plan to notify affected third-party services
+or software that we know about, prepare an advisory, commit fixes to
+the main development branch as quickly as is practical, and finally
+publish the advisory on tz@iana.org.  As with all tzdb contributions,
+we give credit to security contributors unless they wish to remain
+anonymous.
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/africa
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/africa
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/antarctica
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/antarctica
@@ -0,0 +1,309 @@
+# tzdb data for Antarctica and environs
+
+# This file is in the public domain, so clarified as of
+# 2009-05-17 by Arthur David Olson.
+
+# From Paul Eggert (1999-11-15):
+# To keep things manageable, we list only locations occupied year-round; see
+# COMNAP - Stations and Bases
+# http://www.comnap.aq/comnap/comnap.nsf/P/Stations/
+# and
+# Summary of the Peri-Antarctic Islands (1998-07-23)
+# http://www.spri.cam.ac.uk/bob/periant.htm
+# for information.
+# Unless otherwise specified, we have no time zone information.
+
+# FORMAT is '-00' and STDOFF is 0 for locations while uninhabited.
+
+# Argentina - year-round bases
+# Belgrano II, Confin Coast, -770227-0343737, since 1972-02-05
+# Carlini, Potter Cove, King George Island, -6414-0602320, since 1982-01
+# Esperanza, Hope Bay, -6323-05659, since 1952-12-17
+# Marambio, -6414-05637, since 1969-10-29
+# Orcadas, Laurie I, -6016-04444, since 1904-02-22
+# San Martín, Barry I, -6808-06706, since 1951-03-21
+#	(except 1960-03 / 1976-03-21)
+
+# Australia - territories
+# Heard Island, McDonald Islands (uninhabited)
+#	previously sealers and scientific personnel wintered
+#	Margaret Turner reports
+#	https://web.archive.org/web/20021204222245/http://www.dstc.qut.edu.au/DST/marg/daylight.html
+#	(1999-09-30) that they're UT +05, with no DST;
+#	presumably this is when they have visitors.
+#
+# year-round bases
+# Casey, Bailey Peninsula, -6617+11032, since 1969
+# Davis, Vestfold Hills, -6835+07759, since 1957-01-13
+#	(except 1964-11 - 1969-02)
+# Mawson, Holme Bay, -6736+06253, since 1954-02-13
+
+# From Steffen Thorsen (2009-03-11):
+# Three Australian stations in Antarctica have changed their time zone:
+# Casey moved from UTC+8 to UTC+11
+# Davis moved from UTC+7 to UTC+5
+# Mawson moved from UTC+6 to UTC+5
+# The changes occurred on 2009-10-18 at 02:00 (local times).
+#
+# Government source: (Australian Antarctic Division)
+# http://www.aad.gov.au/default.asp?casid=37079
+#
+# We have more background information here:
+# https://www.timeanddate.com/news/time/antarctica-new-times.html
+
+# From Steffen Thorsen (2010-03-10):
+# We got these changes from the Australian Antarctic Division: ...
+#
+# - Casey station reverted to its normal time of UTC+8 on 5 March 2010.
+# The change to UTC+11 is being considered as a regular summer thing but
+# has not been decided yet.
+#
+# - Davis station will revert to its normal time of UTC+7 at 10 March 2010
+# 20:00 UTC.
+#
+# - Mawson station stays on UTC+5.
+#
+# Background:
+# https://www.timeanddate.com/news/time/antartica-time-changes-2010.html
+
+# From Steffen Thorsen (2016-10-28):
+# Australian Antarctica Division informed us that Casey changed time
+# zone to UTC+11 in "the morning of 22nd October 2016".
+
+# From Steffen Thorsen (2020-10-02, as corrected):
+# Based on information we have received from the Australian Antarctic
+# Division, Casey station and Macquarie Island station will move to Tasmanian
+# daylight savings time on Sunday 4 October. This will take effect from 0001
+# hrs on Sunday 4 October 2020 and will mean Casey and Macquarie Island will
+# be on the same time zone as Hobart.  Some past dates too for this 3 hour
+# time change back and forth between UTC+8 and UTC+11 for Casey:
+# - 2018 Oct  7 4:00 - 2019 Mar 17 3:00 - 2019 Oct  4 3:00 - 2020 Mar  8 3:00
+# and now - 2020 Oct  4 0:01
+
+# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
+Zone Antarctica/Casey	 0	-	-00	1969
+			 8:00	-	+08	2009 Oct 18  2:00
+			11:00	-	+11	2010 Mar  5  2:00
+			 8:00	-	+08	2011 Oct 28  2:00
+			11:00	-	+11	2012 Feb 21 17:00u
+			 8:00	-	+08	2016 Oct 22
+			11:00	-	+11	2018 Mar 11  4:00
+			 8:00	-	+08	2018 Oct  7  4:00
+			11:00	-	+11	2019 Mar 17  3:00
+			 8:00	-	+08	2019 Oct  4  3:00
+			11:00	-	+11	2020 Mar  8  3:00
+			 8:00	-	+08	2020 Oct  4  0:01
+			11:00	-	+11
+Zone Antarctica/Davis	0	-	-00	1957 Jan 13
+			7:00	-	+07	1964 Nov
+			0	-	-00	1969 Feb
+			7:00	-	+07	2009 Oct 18  2:00
+			5:00	-	+05	2010 Mar 10 20:00u
+			7:00	-	+07	2011 Oct 28  2:00
+			5:00	-	+05	2012 Feb 21 20:00u
+			7:00	-	+07
+Zone Antarctica/Mawson	0	-	-00	1954 Feb 13
+			6:00	-	+06	2009 Oct 18  2:00
+			5:00	-	+05
+# References:
+# Casey Weather (1998-02-26)
+# http://www.antdiv.gov.au/aad/exop/sfo/casey/casey_aws.html
+# Davis Station, Antarctica (1998-02-26)
+# http://www.antdiv.gov.au/aad/exop/sfo/davis/video.html
+# Mawson Station, Antarctica (1998-02-25)
+# http://www.antdiv.gov.au/aad/exop/sfo/mawson/video.html
+
+# Belgium - year-round base
+# Princess Elisabeth, Queen Maud Land, -713412+0231200, since 2007
+
+# Brazil - year-round base
+# Ferraz, King George Island, -6205+05824, since 1983/4
+
+# Bulgaria - year-round base
+# St. Kliment Ohridski, Livingston Island, -623829-0602153, since 1988
+
+# Chile - year-round bases and towns
+# Escudero, South Shetland Is, -621157-0585735, since 1994
+# Frei Montalva, King George Island, -6214-05848, since 1969-03-07
+# O'Higgins, Antarctic Peninsula, -6319-05704, since 1948-02
+# Prat, -6230-05941
+# Villa Las Estrellas (a town), around the Frei base, since 1984-04-09
+# These locations employ Region of Magallanes time; use
+# TZ='America/Punta_Arenas'.
+
+# China - year-round bases
+# Great Wall, King George Island, -6213-05858, since 1985-02-20
+# Zhongshan, Larsemann Hills, Prydz Bay, -6922+07623, since 1989-02-26
+
+# France - year-round bases (also see "France & Italy")
+#
+# From Antoine Leca (1997-01-20):
+# Time data entries are from Nicole Pailleau at the IFRTP
+# (French Institute for Polar Research and Technology).
+# She confirms that French Southern Territories and Terre Adélie bases
+# don't observe daylight saving time, even if Terre Adélie supplies came
+# from Tasmania.
+#
+# French Southern Territories with year-round inhabitants
+#
+# Alfred Faure, Possession Island, Crozet Islands, -462551+0515152, since 1964;
+#	sealing & whaling stations operated variously 1802/1911+;
+#	see Asia/Dubai.
+#
+# Martin-de-Viviès, Amsterdam Island, -374105+0773155, since 1950
+# Port-aux-Français, Kerguelen Islands, -492110+0701303, since 1951;
+#	whaling & sealing station operated 1908/1914, 1920/1929, and 1951/1956
+#
+# St Paul Island - near Amsterdam, uninhabited
+#	fishing stations operated variously 1819/1931
+#
+# Kerguelen - see Indian/Maldives.
+#
+# year-round base in the main continent
+# Dumont d'Urville - see Pacific/Port_Moresby.
+
+# France & Italy - year-round base
+# Concordia, -750600+1232000, since 2005
+
+# Germany - year-round base
+# Neumayer III, -704080-0081602, since 2009
+
+# India - year-round bases
+# Bharati, -692428+0761114, since 2012
+# Maitri, -704558+0114356, since 1989
+
+# Italy - year-round base (also see "France & Italy")
+# Zuchelli, Terra Nova Bay, -744140+1640647, since 1986
+
+# Japan - year-round bases
+# See Asia/Riyadh.
+
+# S Korea - year-round base
+# Jang Bogo, Terra Nova Bay, -743700+1641205 since 2014
+# King Sejong, King George Island, -6213-05847, since 1988
+
+# New Zealand - claims
+# Balleny Islands (never inhabited)
+# Scott Island (never inhabited)
+#
+# year-round base
+# Scott Base, Ross Island, since 1957-01.
+# See Pacific/Auckland.
+
+# Norway - territories
+# Bouvet (never inhabited)
+#
+# claims
+# Peter I Island (never inhabited)
+#
+# year-round base
+# Troll, Queen Maud Land, -720041+0023206, since 2005-02-12
+#
+# From Paul-Inge Flakstad (2014-03-10):
+# I recently had a long dialog about this with the developer of timegenie.com.
+# In the absence of specific dates, he decided to choose some likely ones:
+#   GMT +1 - From March 1 to the last Sunday in March
+#   GMT +2 - From the last Sunday in March until the last Sunday in October
+#   GMT +1 - From the last Sunday in October until November 7
+#   GMT +0 - From November 7 until March 1
+# The dates for switching to and from UTC+0 will probably not be absolutely
+# correct, but they should be quite close to the actual dates.
+#
+# From Paul Eggert (2014-03-21):
+# The CET-switching Troll rules require zic from tz 2014b or later, so as
+# suggested by Bengt-Inge Larsson comment them out for now, and approximate
+# with only UTC and CEST.  Uncomment them when 2014b is more prevalent.
+#
+# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
+#Rule	Troll	2005	max	-	Mar	 1	1:00u	1:00	+01
+Rule	Troll	2005	max	-	Mar	lastSun	1:00u	2:00	+02
+#Rule	Troll	2005	max	-	Oct	lastSun	1:00u	1:00	+01
+#Rule	Troll	2004	max	-	Nov	 7	1:00u	0:00	+00
+# Remove the following line when uncommenting the above '#Rule' lines.
+Rule	Troll	2004	max	-	Oct	lastSun	1:00u	0:00	+00
+# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
+Zone Antarctica/Troll	0	-	-00	2005 Feb 12
+			0:00	Troll	%s
+
+# Poland - year-round base
+# Arctowski, King George Island, -620945-0582745, since 1977
+
+# Romania - year-bound base
+# Law-Racoviță, Larsemann Hills, -692319+0762251, since 1986
+
+# Russia - year-round bases
+# Bellingshausen, King George Island, -621159-0585337, since 1968-02-22
+# Mirny, Davis coast, -6633+09301, since 1956-02
+# Molodezhnaya, Alasheyev Bay, -6740+04551,
+#	year-round from 1962-02 to 1999-07-01
+# Novolazarevskaya, Queen Maud Land, -7046+01150,
+#	year-round from 1960/61 to 1992
+
+# Vostok, since 1957-12-16, temporarily closed 1994-02/1994-11
+# See Asia/Urumqi.
+
+# S Africa - year-round bases
+# Marion Island, -4653+03752
+# SANAE IV, Vesleskarvet, Queen Maud Land, -714022-0025026, since 1997
+
+# Ukraine - year-round base
+# Vernadsky (formerly Faraday), Galindez Island, -651445-0641526, since 1954
+
+# United Kingdom
+#
+# British Antarctic Territories (BAT) claims
+# South Orkney Islands
+#	scientific station from 1903
+#	whaling station at Signy I 1920/1926
+# South Shetland Islands
+#
+# year-round bases
+# Bird Island, South Georgia, -5400-03803, since 1983
+# Deception Island, -6259-06034, whaling station 1912/1931,
+#	scientific station 1943/1967,
+#	previously sealers and a scientific expedition wintered by accident,
+#	and a garrison was deployed briefly
+# Halley, Coates Land, -7535-02604, since 1956-01-06
+#	Halley is on a moving ice shelf and is periodically relocated
+#	so that it is never more than 10km from its nominal location.
+# Rothera, Adelaide Island, -6734-6808, since 1976-12-01
+#
+# From Paul Eggert (2002-10-22)
+# <http://webexhibits.org/daylightsaving/g.html> says Rothera is -03 all year.
+#
+# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
+Zone Antarctica/Rothera	0	-	-00	1976 Dec  1
+			-3:00	-	-03
+
+# Uruguay - year round base
+# Artigas, King George Island, -621104-0585107
+
+# USA - year-round bases
+#
+# Palmer, Anvers Island, since 1965 (moved 2 miles in 1968)
+# See 'southamerica' for Antarctica/Palmer, since it uses South American DST.
+#
+# McMurdo Station, Ross Island, since 1955-12
+# Amundsen-Scott South Pole Station, continuously occupied since 1956-11-20
+#
+# From Chris Carrier (1996-06-27):
+# Siple, the first commander of the South Pole station,
+# stated that he would have liked to have kept GMT at the station,
+# but that he found it more convenient to keep GMT+12
+# as supplies for the station were coming from McMurdo Sound,
+# which was on GMT+12 because New Zealand was on GMT+12 all year
+# at that time (1957).  (Source: Siple's book 90 Degrees South.)
+#
+# From Susan Smith
+# http://www.cybertours.com/whs/pole10.html
+# (1995-11-13 16:24:56 +1300, no longer available):
+# We use the same time as McMurdo does.
+# And they use the same time as Christchurch, NZ does....
+# One last quirk about South Pole time.
+# All the electric clocks are usually wrong.
+# Something about the generators running at 60.1hertz or something
+# makes all of the clocks run fast.  So every couple of days,
+# we have to go around and set them back 5 minutes or so.
+# Maybe if we let them run fast all of the time, we'd get to leave here sooner!!
+#
+# See Pacific/Auckland.
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/asctime.c
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/asctime.c
@@ -0,0 +1,131 @@
+/* asctime and asctime_r a la POSIX and ISO C, except pad years before 1000.  */
+
+/*
+** This file is in the public domain, so clarified as of
+** 1996-06-05 by Arthur David Olson.
+*/
+
+/*
+** Avoid the temptation to punt entirely to strftime;
+** the output of strftime is supposed to be locale specific
+** whereas the output of asctime is supposed to be constant.
+*/
+
+/*LINTLIBRARY*/
+
+#include "private.h"
+#include <stdio.h>
+
+/*
+** All years associated with 32-bit time_t values are exactly four digits long;
+** some years associated with 64-bit time_t values are not.
+** Vintage programs are coded for years that are always four digits long
+** and may assume that the newline always lands in the same place.
+** For years that are less than four digits, we pad the output with
+** leading zeroes to get the newline in the traditional place.
+** The -4 ensures that we get four characters of output even if
+** we call a strftime variant that produces fewer characters for some years.
+** The ISO C and POSIX standards prohibit padding the year,
+** but many implementations pad anyway; most likely the standards are buggy.
+*/
+static char const ASCTIME_FMT[] = "%s %s%3d %.2d:%.2d:%.2d %-4s\n";
+/*
+** For years that are more than four digits we put extra spaces before the year
+** so that code trying to overwrite the newline won't end up overwriting
+** a digit within a year and truncating the year (operating on the assumption
+** that no output is better than wrong output).
+*/
+static char const ASCTIME_FMT_B[] = "%s %s%3d %.2d:%.2d:%.2d     %s\n";
+
+enum { STD_ASCTIME_BUF_SIZE = 26 };
+/*
+** Big enough for something such as
+** ??? ???-2147483648 -2147483648:-2147483648:-2147483648     -2147483648\n
+** (two three-character abbreviations, five strings denoting integers,
+** seven explicit spaces, two explicit colons, a newline,
+** and a trailing NUL byte).
+** The values above are for systems where an int is 32 bits and are provided
+** as an example; the size expression below is a bound for the system at
+** hand.
+*/
+static char buf_asctime[2*3 + 5*INT_STRLEN_MAXIMUM(int) + 7 + 2 + 1 + 1];
+
+/* A similar buffer for ctime.
+   C89 requires that they be the same buffer.
+   This requirement was removed in C99, so support it only if requested,
+   as support is more likely to lead to bugs in badly-written programs.  */
+#if SUPPORT_C89
+# define buf_ctime buf_asctime
+#else
+static char buf_ctime[sizeof buf_asctime];
+#endif
+
+char *
+asctime_r(register const struct tm *timeptr, char *buf)
+{
+	static const char	wday_name[][4] = {
+		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+	};
+	static const char	mon_name[][4] = {
+		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+	};
+	register const char *	wn;
+	register const char *	mn;
+	char			year[INT_STRLEN_MAXIMUM(int) + 2];
+	char result[sizeof buf_asctime];
+
+	if (timeptr == NULL) {
+		errno = EINVAL;
+		return strcpy(buf, "??? ??? ?? ??:??:?? ????\n");
+	}
+	if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
+		wn = "???";
+	else	wn = wday_name[timeptr->tm_wday];
+	if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
+		mn = "???";
+	else	mn = mon_name[timeptr->tm_mon];
+	/*
+	** Use strftime's %Y to generate the year, to avoid overflow problems
+	** when computing timeptr->tm_year + TM_YEAR_BASE.
+	** Assume that strftime is unaffected by other out-of-range members
+	** (e.g., timeptr->tm_mday) when processing "%Y".
+	*/
+	strftime(year, sizeof year, "%Y", timeptr);
+	/*
+	** We avoid using snprintf since it's not available on all systems.
+	*/
+	sprintf(result,
+		((strlen(year) <= 4) ? ASCTIME_FMT : ASCTIME_FMT_B),
+		wn, mn,
+		timeptr->tm_mday, timeptr->tm_hour,
+		timeptr->tm_min, timeptr->tm_sec,
+		year);
+	if (strlen(result) < STD_ASCTIME_BUF_SIZE
+	    || buf == buf_ctime || buf == buf_asctime)
+		return strcpy(buf, result);
+	else {
+		errno = EOVERFLOW;
+		return NULL;
+	}
+}
+
+char *
+asctime(register const struct tm *timeptr)
+{
+	return asctime_r(timeptr, buf_asctime);
+}
+
+char *
+ctime_r(const time_t *timep, char *buf)
+{
+  struct tm mytm;
+  struct tm *tmp = localtime_r(timep, &mytm);
+  return tmp ? asctime_r(tmp, buf) : NULL;
+}
+
+char *
+ctime(const time_t *timep)
+{
+  return ctime_r(timep, buf_ctime);
+}
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/asia
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/asia
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/australasia
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/australasia
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/backward
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/backward
@@ -0,0 +1,318 @@
+# tzdb links for backward compatibility
+
+# This file is in the public domain, so clarified as of
+# 2009-05-17 by Arthur David Olson.
+
+# This file provides links from old or merged timezone names to current ones.
+# Many names changed in 1993 and in 1995, and many merged names moved here
+# in the period from 2013 through 2022.  Several of these names are
+# also present in the file 'backzone', which has data important only
+# for pre-1970 timestamps and so is out of scope for tzdb proper.
+
+# Although this file is optional and tzdb will work if you omit it by
+# building with 'make BACKWARD=', in practice downstream users
+# typically use this file for backward compatibility.
+
+# This file is divided into sections, one for each major reason for a
+# backward compatibility link.  Each section is sorted by link name.
+
+# A "#= TARGET1" comment labels each link inserted only because some
+# .zi parsers (including tzcode through 2022e) mishandle links to links.
+# The comment says what the target would be if these parsers were fixed
+# so that data could contain links to links.  For example, the line
+# "Link Australia/Sydney Australia/ACT #= Australia/Canberra" would be
+# "Link Australia/Canberra Australia/ACT" were it not that data lines
+# refrain from linking to links like Australia/Canberra, which means
+# the Australia/ACT line links instead to Australia/Sydney,
+# Australia/Canberra's target.
+
+
+# Pre-1993 naming conventions
+
+# Link	TARGET			LINK-NAME	#= TARGET1
+Link	Australia/Sydney	Australia/ACT	#= Australia/Canberra
+Link	Australia/Lord_Howe	Australia/LHI
+Link	Australia/Sydney	Australia/NSW
+Link	Australia/Darwin	Australia/North
+Link	Australia/Brisbane	Australia/Queensland
+Link	Australia/Adelaide	Australia/South
+Link	Australia/Hobart	Australia/Tasmania
+Link	Australia/Melbourne	Australia/Victoria
+Link	Australia/Perth		Australia/West
+Link	Australia/Broken_Hill	Australia/Yancowinna
+Link	America/Rio_Branco	Brazil/Acre	#= America/Porto_Acre
+Link	America/Noronha		Brazil/DeNoronha
+Link	America/Sao_Paulo	Brazil/East
+Link	America/Manaus		Brazil/West
+Link	America/Halifax		Canada/Atlantic
+Link	America/Winnipeg	Canada/Central
+# This line is commented out, as the name exceeded the 14-character limit
+# and was an unused misnomer.
+#Link	America/Regina		Canada/East-Saskatchewan
+Link	America/Toronto		Canada/Eastern
+Link	America/Edmonton	Canada/Mountain
+Link	America/St_Johns	Canada/Newfoundland
+Link	America/Vancouver	Canada/Pacific
+Link	America/Regina		Canada/Saskatchewan
+Link	America/Whitehorse	Canada/Yukon
+Link	America/Santiago	Chile/Continental
+Link	Pacific/Easter		Chile/EasterIsland
+Link	America/Havana		Cuba
+Link	Africa/Cairo		Egypt
+Link	Europe/Dublin		Eire
+# Vanguard section, for most .zi parsers.
+#Link	GMT			Etc/GMT
+#Link	GMT			Etc/GMT+0
+#Link	GMT			Etc/GMT-0
+#Link	GMT			Etc/GMT0
+#Link	GMT			Etc/Greenwich
+# Rearguard section, for TZUpdater 2.3.2 and earlier.
+Link	Etc/GMT			Etc/GMT+0
+Link	Etc/GMT			Etc/GMT-0
+Link	Etc/GMT			Etc/GMT0
+Link	Etc/GMT			Etc/Greenwich
+# End of rearguard section.
+Link	Etc/UTC			Etc/UCT
+Link	Etc/UTC			Etc/Universal
+Link	Etc/UTC			Etc/Zulu
+Link	Europe/London		GB
+Link	Europe/London		GB-Eire
+# Vanguard section, for most .zi parsers.
+#Link	GMT			GMT+0
+#Link	GMT			GMT-0
+#Link	GMT			GMT0
+#Link	GMT			Greenwich
+# Rearguard section, for TZUpdater 2.3.2 and earlier.
+Link	Etc/GMT			GMT+0
+Link	Etc/GMT			GMT-0
+Link	Etc/GMT			GMT0
+Link	Etc/GMT			Greenwich
+# End of rearguard section.
+Link	Asia/Hong_Kong		Hongkong
+Link	Africa/Abidjan		Iceland	#= Atlantic/Reykjavik
+Link	Asia/Tehran		Iran
+Link	Asia/Jerusalem		Israel
+Link	America/Jamaica		Jamaica
+Link	Asia/Tokyo		Japan
+Link	Pacific/Kwajalein	Kwajalein
+Link	Africa/Tripoli		Libya
+Link	America/Tijuana		Mexico/BajaNorte
+Link	America/Mazatlan	Mexico/BajaSur
+Link	America/Mexico_City	Mexico/General
+Link	Pacific/Auckland	NZ
+Link	Pacific/Chatham		NZ-CHAT
+Link	America/Denver		Navajo	#= America/Shiprock
+Link	Asia/Shanghai		PRC
+Link	Europe/Warsaw		Poland
+Link	Europe/Lisbon		Portugal
+Link	Asia/Taipei		ROC
+Link	Asia/Seoul		ROK
+Link	Asia/Singapore		Singapore
+Link	Europe/Istanbul		Turkey
+Link	Etc/UTC			UCT
+Link	America/Anchorage	US/Alaska
+Link	America/Adak		US/Aleutian
+Link	America/Phoenix		US/Arizona
+Link	America/Chicago		US/Central
+Link	America/Indiana/Indianapolis	US/East-Indiana
+Link	America/New_York	US/Eastern
+Link	Pacific/Honolulu	US/Hawaii
+Link	America/Indiana/Knox	US/Indiana-Starke
+Link	America/Detroit		US/Michigan
+Link	America/Denver		US/Mountain
+Link	America/Los_Angeles	US/Pacific
+Link	Pacific/Pago_Pago	US/Samoa
+Link	Etc/UTC			UTC
+Link	Etc/UTC			Universal
+Link	Europe/Moscow		W-SU
+Link	Etc/UTC			Zulu
+
+
+# Two-part names that were renamed mostly to three-part names in 1995
+
+# Link	TARGET				LINK-NAME	#= TARGET1
+Link	America/Argentina/Buenos_Aires	America/Buenos_Aires
+Link	America/Argentina/Catamarca	America/Catamarca
+Link	America/Argentina/Cordoba	America/Cordoba
+Link	America/Indiana/Indianapolis	America/Indianapolis
+Link	America/Argentina/Jujuy		America/Jujuy
+Link	America/Indiana/Knox		America/Knox_IN
+Link	America/Kentucky/Louisville	America/Louisville
+Link	America/Argentina/Mendoza	America/Mendoza
+Link	America/Puerto_Rico		America/Virgin	#= America/St_Thomas
+Link	Pacific/Pago_Pago		Pacific/Samoa
+
+
+# Pre-2013 practice, which typically had a Zone per zone.tab line
+
+# Link	TARGET			LINK-NAME
+Link	Africa/Abidjan		Africa/Accra
+Link	Africa/Nairobi		Africa/Addis_Ababa
+Link	Africa/Nairobi		Africa/Asmara
+Link	Africa/Abidjan		Africa/Bamako
+Link	Africa/Lagos		Africa/Bangui
+Link	Africa/Abidjan		Africa/Banjul
+Link	Africa/Maputo		Africa/Blantyre
+Link	Africa/Lagos		Africa/Brazzaville
+Link	Africa/Maputo		Africa/Bujumbura
+Link	Africa/Abidjan		Africa/Conakry
+Link	Africa/Abidjan		Africa/Dakar
+Link	Africa/Nairobi		Africa/Dar_es_Salaam
+Link	Africa/Nairobi		Africa/Djibouti
+Link	Africa/Lagos		Africa/Douala
+Link	Africa/Abidjan		Africa/Freetown
+Link	Africa/Maputo		Africa/Gaborone
+Link	Africa/Maputo		Africa/Harare
+Link	Africa/Nairobi		Africa/Kampala
+Link	Africa/Maputo		Africa/Kigali
+Link	Africa/Lagos		Africa/Kinshasa
+Link	Africa/Lagos		Africa/Libreville
+Link	Africa/Abidjan		Africa/Lome
+Link	Africa/Lagos		Africa/Luanda
+Link	Africa/Maputo		Africa/Lubumbashi
+Link	Africa/Maputo		Africa/Lusaka
+Link	Africa/Lagos		Africa/Malabo
+Link	Africa/Johannesburg	Africa/Maseru
+Link	Africa/Johannesburg	Africa/Mbabane
+Link	Africa/Nairobi		Africa/Mogadishu
+Link	Africa/Lagos		Africa/Niamey
+Link	Africa/Abidjan		Africa/Nouakchott
+Link	Africa/Abidjan		Africa/Ouagadougou
+Link	Africa/Lagos		Africa/Porto-Novo
+Link	America/Puerto_Rico	America/Anguilla
+Link	America/Puerto_Rico	America/Antigua
+Link	America/Puerto_Rico	America/Aruba
+Link	America/Panama		America/Atikokan
+Link	America/Puerto_Rico	America/Blanc-Sablon
+Link	America/Panama		America/Cayman
+Link	America/Phoenix		America/Creston
+Link	America/Puerto_Rico	America/Curacao
+Link	America/Puerto_Rico	America/Dominica
+Link	America/Puerto_Rico	America/Grenada
+Link	America/Puerto_Rico	America/Guadeloupe
+Link	America/Puerto_Rico	America/Kralendijk
+Link	America/Puerto_Rico	America/Lower_Princes
+Link	America/Puerto_Rico	America/Marigot
+Link	America/Puerto_Rico	America/Montserrat
+Link	America/Toronto		America/Nassau
+Link	America/Puerto_Rico	America/Port_of_Spain
+Link	America/Puerto_Rico	America/St_Barthelemy
+Link	America/Puerto_Rico	America/St_Kitts
+Link	America/Puerto_Rico	America/St_Lucia
+Link	America/Puerto_Rico	America/St_Thomas
+Link	America/Puerto_Rico	America/St_Vincent
+Link	America/Puerto_Rico	America/Tortola
+Link	Pacific/Port_Moresby	Antarctica/DumontDUrville
+Link	Pacific/Auckland	Antarctica/McMurdo
+Link	Asia/Riyadh		Antarctica/Syowa
+Link	Asia/Urumqi		Antarctica/Vostok
+Link	Europe/Berlin		Arctic/Longyearbyen
+Link	Asia/Riyadh		Asia/Aden
+Link	Asia/Qatar		Asia/Bahrain
+Link	Asia/Kuching		Asia/Brunei
+Link	Asia/Singapore		Asia/Kuala_Lumpur
+Link	Asia/Riyadh		Asia/Kuwait
+Link	Asia/Dubai		Asia/Muscat
+Link	Asia/Bangkok		Asia/Phnom_Penh
+Link	Asia/Bangkok		Asia/Vientiane
+Link	Africa/Abidjan		Atlantic/Reykjavik
+Link	Africa/Abidjan		Atlantic/St_Helena
+Link	Europe/Brussels		Europe/Amsterdam
+Link	Europe/Prague		Europe/Bratislava
+Link	Europe/Zurich		Europe/Busingen
+Link	Europe/Berlin		Europe/Copenhagen
+Link	Europe/London		Europe/Guernsey
+Link	Europe/London		Europe/Isle_of_Man
+Link	Europe/London		Europe/Jersey
+Link	Europe/Belgrade		Europe/Ljubljana
+Link	Europe/Brussels		Europe/Luxembourg
+Link	Europe/Helsinki		Europe/Mariehamn
+Link	Europe/Paris		Europe/Monaco
+Link	Europe/Berlin		Europe/Oslo
+Link	Europe/Belgrade		Europe/Podgorica
+Link	Europe/Rome		Europe/San_Marino
+Link	Europe/Belgrade		Europe/Sarajevo
+Link	Europe/Belgrade		Europe/Skopje
+Link	Europe/Berlin		Europe/Stockholm
+Link	Europe/Zurich		Europe/Vaduz
+Link	Europe/Rome		Europe/Vatican
+Link	Europe/Belgrade		Europe/Zagreb
+Link	Africa/Nairobi		Indian/Antananarivo
+Link	Asia/Bangkok		Indian/Christmas
+Link	Asia/Yangon		Indian/Cocos
+Link	Africa/Nairobi		Indian/Comoro
+Link	Indian/Maldives		Indian/Kerguelen
+Link	Asia/Dubai		Indian/Mahe
+Link	Africa/Nairobi		Indian/Mayotte
+Link	Asia/Dubai		Indian/Reunion
+Link	Pacific/Port_Moresby	Pacific/Chuuk
+Link	Pacific/Tarawa		Pacific/Funafuti
+Link	Pacific/Tarawa		Pacific/Majuro
+Link	Pacific/Pago_Pago	Pacific/Midway
+Link	Pacific/Guadalcanal	Pacific/Pohnpei
+Link	Pacific/Guam		Pacific/Saipan
+Link	Pacific/Tarawa		Pacific/Wake
+Link	Pacific/Tarawa		Pacific/Wallis
+
+
+# Non-zone.tab locations with timestamps since 1970 that duplicate
+# those of an existing location
+
+# Link	TARGET			LINK-NAME
+Link	Africa/Abidjan		Africa/Timbuktu
+Link	America/Argentina/Catamarca	America/Argentina/ComodRivadavia
+Link	America/Adak		America/Atka
+Link	America/Panama		America/Coral_Harbour
+Link	America/Tijuana		America/Ensenada
+Link	America/Indiana/Indianapolis	America/Fort_Wayne
+Link	America/Toronto		America/Montreal
+Link	America/Toronto		America/Nipigon
+Link	America/Iqaluit		America/Pangnirtung
+Link	America/Rio_Branco	America/Porto_Acre
+Link	America/Winnipeg	America/Rainy_River
+Link	America/Argentina/Cordoba	America/Rosario
+Link	America/Tijuana		America/Santa_Isabel
+Link	America/Denver		America/Shiprock
+Link	America/Toronto		America/Thunder_Bay
+Link	Pacific/Auckland	Antarctica/South_Pole
+Link	Asia/Shanghai		Asia/Chongqing
+Link	Asia/Shanghai		Asia/Harbin
+Link	Asia/Urumqi		Asia/Kashgar
+Link	Asia/Jerusalem		Asia/Tel_Aviv
+Link	Europe/Berlin		Atlantic/Jan_Mayen
+Link	Australia/Sydney	Australia/Canberra
+Link	Australia/Hobart	Australia/Currie
+Link	Europe/London		Europe/Belfast
+Link	Europe/Chisinau		Europe/Tiraspol
+Link	Europe/Kyiv		Europe/Uzhgorod
+Link	Europe/Kyiv		Europe/Zaporozhye
+Link	Pacific/Kanton		Pacific/Enderbury
+Link	Pacific/Honolulu	Pacific/Johnston
+Link	Pacific/Port_Moresby	Pacific/Yap
+
+
+# Alternate names for the same location
+
+# Link	TARGET			LINK-NAME	#= TARGET1
+Link	Africa/Nairobi		Africa/Asmera	#= Africa/Asmara
+Link	America/Nuuk		America/Godthab
+Link	Asia/Ashgabat		Asia/Ashkhabad
+Link	Asia/Kolkata		Asia/Calcutta
+Link	Asia/Shanghai		Asia/Chungking	#= Asia/Chongqing
+Link	Asia/Dhaka		Asia/Dacca
+# Istanbul is in both continents.
+Link	Europe/Istanbul		Asia/Istanbul
+Link	Asia/Kathmandu		Asia/Katmandu
+Link	Asia/Macau		Asia/Macao
+Link	Asia/Yangon		Asia/Rangoon
+Link	Asia/Ho_Chi_Minh	Asia/Saigon
+Link	Asia/Thimphu		Asia/Thimbu
+Link	Asia/Makassar		Asia/Ujung_Pandang
+Link	Asia/Ulaanbaatar	Asia/Ulan_Bator
+Link	Atlantic/Faroe		Atlantic/Faeroe
+Link	Europe/Kyiv		Europe/Kiev
+# Classically, Cyprus is in Asia; e.g. see Herodotus, Histories, I.72.
+# However, for various reasons many users expect to find it under Europe.
+Link	Asia/Nicosia		Europe/Nicosia
+Link	Pacific/Guadalcanal	Pacific/Ponape	#= Pacific/Pohnpei
+Link	Pacific/Port_Moresby	Pacific/Truk	#= Pacific/Chuuk
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/backzone
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/backzone
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/calendars
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/calendars
@@ -0,0 +1,173 @@
+----- Calendrical issues -----
+
+As mentioned in Theory.html, although calendrical issues are out of
+scope for tzdb, they indicate the sort of problems that we would run
+into if we extended tzdb further into the past.  The following
+information and sources go beyond Theory.html's brief discussion.
+They sometimes disagree.
+
+
+France
+
+Gregorian calendar adopted 1582-12-20.
+French Revolutionary calendar used 1793-11-24 through 1805-12-31,
+and (in Paris only) 1871-05-06 through 1871-05-23.
+
+
+Russia
+
+From Chris Carrier (1996-12-02):
+On 1929-10-01 the Soviet Union instituted an "Eternal Calendar"
+with 30-day months plus 5 holidays, with a 5-day week.
+On 1931-12-01 it changed to a 6-day week; in 1934 it reverted to the
+Gregorian calendar while retaining the 6-day week; on 1940-06-27 it
+reverted to the 7-day week.  With the 6-day week the usual days
+off were the 6th, 12th, 18th, 24th and 30th of the month.
+(Source: Evitiar Zerubavel, _The Seven Day Circle_)
+
+
+Mark Brader reported a similar story in "The Book of Calendars", edited
+by Frank Parise (1982, Facts on File, ISBN 0-8719-6467-8), page 377.  But:
+
+From: Petteri Sulonen (via Usenet)
+Date: 14 Jan 1999 00:00:00 GMT
+...
+
+If your source is correct, how come documents between 1929 and 1940 were
+still dated using the conventional, Gregorian calendar?
+
+I can post a scan of a document dated December 1, 1934, signed by
+Yenukidze, the secretary, on behalf of Kalinin, the President of the
+Executive Committee of the Supreme Soviet, if you like.
+
+
+
+Sweden (and Finland)
+
+From: Mark Brader
+Subject: Re: Gregorian reform - a part of locale?
+<news:1996Jul6.012937.29190@sq.com>
+Date: 1996-07-06
+
+In 1700, Denmark made the transition from Julian to Gregorian.  Sweden
+decided to *start* a transition in 1700 as well, but rather than have one of
+those unsightly calendar gaps :-), they simply decreed that the next leap
+year after 1696 would be in 1744 - putting the whole country on a calendar
+different from both Julian and Gregorian for a period of 40 years.
+
+However, in 1704 something went wrong and the plan was not carried through;
+they did, after all, have a leap year that year.  And one in 1708.  In 1712
+they gave it up and went back to Julian, putting 30 days in February that
+year!...
+
+Then in 1753, Sweden made the transition to Gregorian in the usual manner,
+getting there only 13 years behind the original schedule.
+
+(A previous posting of this story was challenged, and Swedish readers
+produced the following references to support it: "Tideräkning och historia"
+by Natanael Beckman (1924) and "Tid, en bok om tideräkning och
+kalenderväsen" by Lars-Olof Lodén (1968).
+
+
+Grotefend's data
+
+From: "Michael Palmer" [with two obvious typos fixed]
+Subject: Re: Gregorian Calendar (was Re: Another FHC related question
+Newsgroups: soc.genealogy.german
+Date: Tue, 9 Feb 1999 02:32:48 -800
+...
+
+The following is a(n incomplete) listing, arranged chronologically, of
+European states, with the date they converted from the Julian to the
+Gregorian calendar:
+
+04/15 Oct 1582 - Italy (with exceptions), Spain, Portugal, Poland (Roman
+                 Catholics and Danzig only)
+09/20 Dec 1582 - France, Lorraine
+
+21 Dec 1582/
+   01 Jan 1583 - Holland, Brabant, Flanders, Hennegau
+10/21 Feb 1583 - bishopric of Liege (Lüttich)
+13/24 Feb 1583 - bishopric of Augsburg
+04/15 Oct 1583 - electorate of Trier
+05/16 Oct 1583 - Bavaria, bishoprics of Freising, Eichstedt, Regensburg,
+                 Salzburg, Brixen
+13/24 Oct 1583 - Austrian Oberelsaß and Breisgau
+20/31 Oct 1583 - bishopric of Basel
+02/13 Nov 1583 - duchy of Jülich-Berg
+02/13 Nov 1583 - electorate and city of Köln
+04/15 Nov 1583 - bishopric of Würzburg
+11/22 Nov 1583 - electorate of Mainz
+16/27 Nov 1583 - bishopric of Strassburg and the margraviate of Baden
+17/28 Nov 1583 - bishopric of Münster and duchy of Cleve
+14/25 Dec 1583 - Steiermark
+
+06/17 Jan 1584 - Austria and Bohemia
+11/22 Jan 1584 - Lucerne, Uri, Schwyz, Zug, Freiburg, Solothurn
+12/23 Jan 1584 - Silesia and the Lausitz
+22 Jan/
+   02 Feb 1584 - Hungary (legally on 21 Oct 1587)
+      Jun 1584 - Unterwalden
+01/12 Jul 1584 - duchy of Westfalen
+
+16/27 Jun 1585 - bishopric of Paderborn
+
+14/25 Dec 1590 - Transylvania
+
+22 Aug/
+   02 Sep 1612 - duchy of Prussia
+
+13/24 Dec 1614 - Pfalz-Neuburg
+
+          1617 - duchy of Kurland (reverted to the Julian calendar in
+                 1796)
+
+          1624 - bishopric of Osnabrück
+
+          1630 - bishopric of Minden
+
+15/26 Mar 1631 - bishopric of Hildesheim
+
+          1655 - Kanton Wallis
+
+05/16 Feb 1682 - city of Strassburg
+
+18 Feb/
+   01 Mar 1700 - Protestant Germany (including Swedish possessions in
+                 Germany), Denmark, Norway
+30 Jun/
+   12 Jul 1700 - Gelderland, Zutphen
+10 Nov/
+   12 Dec 1700 - Utrecht, Overijssel
+
+31 Dec 1700/
+   12 Jan 1701 - Friesland, Groningen, Zürich, Bern, Basel, Geneva,
+                 Thurgau, and Schaffhausen
+
+          1724 - Glarus, Appenzell, and the city of St. Gallen
+
+01 Jan 1750    - Pisa and Florence
+
+02/14 Sep 1752 - Great Britain
+
+17 Feb/
+   01 Mar 1753 - Sweden
+
+1760-1812      - Graubünden
+
+The Russian empire (including Finland and the Baltic states) did not
+convert to the Gregorian calendar until the Soviet revolution of 1917.
+
+Source: H. Grotefend, _Taschenbuch der Zeitrechnung des deutschen
+Mittelalters und der Neuzeit_, herausgegeben von Dr. O. Grotefend
+(Hannover: Hahnsche Buchhandlung, 1941), pp. 26-28.
+
+-----
+
+This file is in the public domain, so clarified as of 2009-05-17 by
+Arthur David Olson.
+
+-----
+Local Variables:
+coding: utf-8
+End:
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/checklinks.awk
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/checklinks.awk
@@ -0,0 +1,70 @@
+# Check links in tz tables.
+
+# Contributed by Paul Eggert.  This file is in the public domain.
+
+BEGIN {
+    # Special marker indicating that the name is defined as a Zone.
+    # It is a newline so that it cannot match a valid name.
+    # It is not null so that its slot does not appear unset.
+    Zone = "\n"
+}
+
+/^Z/ {
+    if (defined[$2]) {
+	if (defined[$2] == Zone) {
+	    printf "%s: Zone has duplicate definition\n", $2
+	} else {
+	    printf "%s: Link with same name as Zone\n", $2
+	}
+	status = 1
+    }
+    defined[$2] = Zone
+}
+
+/^L/ {
+    if (defined[$3]) {
+	if (defined[$3] == Zone) {
+	    printf "%s: Link with same name as Zone\n", $3
+	} else if (defined[$3] == $2) {
+	    printf "%s: Link has duplicate definition\n", $3
+	} else {
+	    printf "%s: Link to both %s and %s\n", $3, defined[$3], $2
+	}
+	status = 1
+    }
+    if (backcheck && FILENAME != backcheck && $3 != "GMT") {
+      printf "%s: Link should be in '%s'\n", $3, backcheck
+      status = 1
+    }
+    if ($4 == "#=") {
+      shortcut[$5] = $3
+    }
+    used[$2] = 1
+    defined[$3] = $2
+}
+
+END {
+    for (tz in used) {
+	if (defined[tz] != Zone) {
+	  if (!defined[tz]) {
+	    printf "%s: Link to nowhere\n", tz
+	    status = 1
+	  } else if (DATAFORM != "vanguard") {
+	    printf "%s: Link to link\n", tz
+	    status = 1
+	  }
+	}
+    }
+    for (tz in shortcut) {
+      if (defined[shortcut[tz]] != defined[tz]) {
+	target = (!defined[tz] ? "absence" \
+		  : defined[tz] == "\n" ? "zone" \
+		  : defined[tz])
+	printf "%s: target %s disagrees with %s's target %s\n", \
+	  tz, target, shortcut[tz], defined[shortcut[tz]]
+	status = 1
+      }
+    }
+
+    exit status
+}
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/checktab.awk
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/checktab.awk
@@ -0,0 +1,191 @@
+# Check tz tables for consistency.
+
+# Contributed by Paul Eggert.  This file is in the public domain.
+
+BEGIN {
+	FS = "\t"
+
+	if (!iso_table) iso_table = "iso3166.tab"
+	if (!zone_table) zone_table = "zone1970.tab"
+	if (!want_warnings) want_warnings = -1
+
+	while (getline <iso_table) {
+		iso_NR++
+		if ($0 ~ /^#/) continue
+		if (NF != 2) {
+			printf "%s:%d: wrong number of columns\n", \
+				iso_table, iso_NR >>"/dev/stderr"
+			status = 1
+		}
+		cc = $1
+		name = $2
+		if (cc !~ /^[A-Z][A-Z]$/) {
+			printf "%s:%d: invalid country code '%s'\n", \
+				iso_table, iso_NR, cc >>"/dev/stderr"
+			status = 1
+		}
+		if (cc <= cc0) {
+			if (cc == cc0) {
+				s = "duplicate";
+			} else {
+				s = "out of order";
+			}
+
+			printf "%s:%d: country code '%s' is %s\n", \
+				iso_table, iso_NR, cc, s \
+				>>"/dev/stderr"
+			status = 1
+		}
+		cc0 = cc
+		if (name2cc[name]) {
+			printf "%s:%d: '%s' and '%s' have the same name\n", \
+				iso_table, iso_NR, name2cc[name], cc \
+				>>"/dev/stderr"
+			status = 1
+		}
+		name2cc[name] = cc
+		cc2name[cc] = name
+		cc2NR[cc] = iso_NR
+	}
+
+	cc0 = ""
+
+	while (getline <zone_table) {
+		zone_NR++
+		if ($0 ~ /^#/) continue
+		if (NF != 3 && NF != 4) {
+			printf "%s:%d: wrong number of columns\n", \
+				zone_table, zone_NR >>"/dev/stderr"
+			status = 1
+		}
+		ccs = input_ccs[zone_NR] = $1
+		coordinates = $2
+		tz = $3
+		comments = input_comments[zone_NR] = $4
+		split(ccs, cca, /,/)
+		cc = cca[1]
+
+		# Don't complain about a special case for Crimea in zone.tab.
+		# FIXME: zone.tab should be removed, since it is obsolete.
+		# Or at least put just "XX" in its country-code column.
+		if (cc < cc0 \
+		    && !(zone_table == "zone.tab" \
+			 && tz0 == "Europe/Simferopol")) {
+			printf "%s:%d: country code '%s' is out of order\n", \
+				zone_table, zone_NR, cc >>"/dev/stderr"
+			status = 1
+		}
+		cc0 = cc
+		tz0 = tz
+		tztab[tz] = 1
+		tz2NR[tz] = zone_NR
+		for (i in cca) {
+		    cc = cca[i]
+		    if (cc2name[cc]) {
+			cc_used[cc]++
+		    } else {
+			printf "%s:%d: %s: unknown country code\n", \
+				zone_table, zone_NR, cc >>"/dev/stderr"
+			status = 1
+		    }
+		}
+		if (coordinates !~ /^[-+][0-9][0-9][0-5][0-9][-+][01][0-9][0-9][0-5][0-9]$/ \
+		    && coordinates !~ /^[-+][0-9][0-9][0-5][0-9][0-5][0-9][-+][01][0-9][0-9][0-5][0-9][0-5][0-9]$/) {
+			printf "%s:%d: %s: invalid coordinates\n", \
+				zone_table, zone_NR, coordinates >>"/dev/stderr"
+			status = 1
+		}
+	}
+
+	for (i = 1; i <= zone_NR; i++) {
+	  ccs = input_ccs[i]
+	  if (!ccs) continue
+	  comments = input_comments[i]
+	  split(ccs, cca, /,/)
+	  used_max = 0
+          for (j in cca) {
+	    cc = cca[j]
+	    if (used_max < cc_used[cc]) {
+	      used_max = cc_used[cc]
+	    }
+	  }
+	  if (used_max <= 1 && comments) {
+	    printf "%s:%d: unnecessary comment '%s'\n", \
+	      zone_table, i, comments \
+	      >>"/dev/stderr"
+	    status = 1
+	  } else if (1 < cc_used[cc] && !comments) {
+	    printf "%s:%d: missing comment for %s\n", \
+	      zone_table, i, cc \
+	      >>"/dev/stderr"
+	    status = 1
+	  }
+	}
+	FS = " "
+}
+
+$1 ~ /^#/ { next }
+
+{
+	tz = rules = ""
+	if ($1 == "Zone") {
+		tz = $2
+		ruleUsed[$4] = 1
+		if ($5 ~ /%/) rulePercentUsed[$4] = 1
+	} else if ($1 == "Link" && zone_table == "zone.tab") {
+		# Ignore Link commands if source and destination basenames
+		# are identical, e.g. Europe/Istanbul versus Asia/Istanbul.
+		src = $2
+		dst = $3
+		while ((i = index(src, "/"))) src = substr(src, i+1)
+		while ((i = index(dst, "/"))) dst = substr(dst, i+1)
+		if (src != dst) tz = $3
+	} else if ($1 == "Rule") {
+		ruleDefined[$2] = 1
+		if ($10 != "-") ruleLetters[$2] = 1
+	} else {
+		ruleUsed[$2] = 1
+		if ($3 ~ /%/) rulePercentUsed[$2] = 1
+	}
+	if (tz && tz ~ /\// && tz !~ /^Etc\//) {
+		if (!tztab[tz] && FILENAME != "backward") {
+			printf "%s: no data for '%s'\n", zone_table, tz \
+				>>"/dev/stderr"
+			status = 1
+		}
+		zoneSeen[tz] = 1
+	}
+}
+
+END {
+	for (tz in ruleDefined) {
+		if (!ruleUsed[tz]) {
+			printf "%s: Rule never used\n", tz
+			status = 1
+		}
+	}
+	for (tz in ruleLetters) {
+		if (!rulePercentUsed[tz]) {
+			printf "%s: Rule contains letters never used\n", tz
+			status = 1
+		}
+	}
+	for (tz in tztab) {
+		if (!zoneSeen[tz] && tz !~ /^Etc\//) {
+			printf "%s:%d: no Zone table for '%s'\n", \
+				zone_table, tz2NR[tz], tz >>"/dev/stderr"
+			status = 1
+		}
+	}
+	if (0 < want_warnings) {
+		for (cc in cc2name) {
+			if (!cc_used[cc]) {
+				printf "%s:%d: warning: " \
+					"no Zone entries for %s (%s)\n", \
+					iso_table, cc2NR[cc], cc, cc2name[cc]
+			}
+		}
+	}
+
+	exit status
+}
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/date.1
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/date.1
@@ -0,0 +1,167 @@
+.\" This file is in the public domain, so clarified as of
+.\" 2009-05-17 by Arthur David Olson.
+.TH date 1
+.SH NAME
+date \- show and set date and time
+.SH SYNOPSIS
+.if n .nh
+.if n .na
+.ie \n(.g .ds - \f(CR-\fP
+.el .ds - \-
+.B date
+[
+.B \*-u
+] [
+.B \*-c
+] [
+.B \*-r
+.I seconds
+] [
+.BI + format
+] [
+\fR[\fIyyyy\fR]\fImmddhhmm\fR[\fIyy\fR][\fB.\fIss\fR]
+]
+.SH DESCRIPTION
+.ie '\(lq'' .ds lq \&"\"
+.el .ds lq \(lq\"
+.ie '\(rq'' .ds rq \&"\"
+.el .ds rq \(rq\"
+.de q
+\\$3\*(lq\\$1\*(rq\\$2
+..
+The
+.B date
+command
+without arguments writes the date and time to the standard output in
+the form
+.ce 1
+Wed Mar  8 14:54:40 EST 1989
+.br
+with
+.B EST
+replaced by the local time zone's abbreviation
+(or by the abbreviation for the time zone specified in the
+.B TZ
+environment variable if set).
+The exact output format depends on the locale.
+.PP
+If a command-line argument starts with a plus sign (\c
+.q "\fB+\fP" ),
+the rest of the argument is used as a
+.I format
+that controls what appears in the output.
+In the format, when a percent sign (\c
+.q "\fB%\fP"
+appears,
+it and the character after it are not output,
+but rather identify part of the date or time
+to be output in a particular way
+(or identify a special character to output):
+.nf
+.sp
+.if t .in +.5i
+.if n .in +2
+.ta \w'%M\0\0'u +\w'Wed Mar  8 14:54:40 EST 1989\0\0'u
+	Sample output	Explanation
+%a	Wed	Abbreviated weekday name*
+%A	Wednesday	Full weekday name*
+%b	Mar	Abbreviated month name*
+%B	March	Full month name*
+%c	Wed Mar 08 14:54:40 1989	Date and time*
+%C	19	Century
+%d	08	Day of month (always two digits)
+%D	03/08/89	Month/day/year (eight characters)
+%e	 8	Day of month (leading zero blanked)
+%h	Mar	Abbreviated month name*
+%H	14	24-hour-clock hour (two digits)
+%I	02	12-hour-clock hour (two digits)
+%j	067	Julian day number (three digits)
+%k	 2	12-hour-clock hour (leading zero blanked)
+%l	14	24-hour-clock hour (leading zero blanked)
+%m	03	Month number (two digits)
+%M	54	Minute (two digits)
+%n	\\n	newline character
+%p	PM	AM/PM designation
+%r	02:54:40 PM	Hour:minute:second AM/PM designation
+%R	14:54	Hour:minute
+%S	40	Second (two digits)
+%t	\\t	tab character
+%T	14:54:40	Hour:minute:second
+%U	10	Sunday-based week number (two digits)
+%w	3	Day number (one digit, Sunday is 0)
+%W	10	Monday-based week number (two digits)
+%x	03/08/89	Date*
+%X	14:54:40	Time*
+%y	89	Last two digits of year
+%Y	1989	Year in full
+%z	-0500	Numeric time zone
+%Z	EST	Time zone abbreviation
+%+	Wed Mar  8 14:54:40 EST 1989	Default output format*
+.if t .in -.5i
+.if n .in -2
+* The exact output depends on the locale.
+.sp
+.fi
+If a character other than one of those shown above appears after
+a percent sign in the format,
+that following character is output.
+All other characters in the format are copied unchanged to the output;
+a newline character is always added at the end of the output.
+.PP
+In Sunday-based week numbering,
+the first Sunday of the year begins week 1;
+days preceding it are part of
+.q "week 0" .
+In Monday-based week numbering,
+the first Monday of the year begins week 1.
+.PP
+To set the date, use a command line argument with one of the following forms:
+.nf
+.if t .in +.5i
+.if n .in +2
+.ta \w'198903081454\0'u
+1454	24-hour-clock hours (first two digits) and minutes
+081454	Month day (first two digits), hours, and minutes
+03081454	Month (two digits, January is 01), month day, hours, minutes
+8903081454	Year, month, month day, hours, minutes
+0308145489	Month, month day, hours, minutes, year
+	(on System V-compatible systems)
+030814541989	Month, month day, hours, minutes, four-digit year
+198903081454	Four-digit year, month, month day, hours, minutes
+.if t .in -.5i
+.if n .in -2
+.fi
+If the century, year, month, or month day is not given,
+the current value is used.
+Any of the above forms may be followed by a period and two digits that give
+the seconds part of the new time; if no seconds are given, zero is assumed.
+.PP
+These options are available:
+.TP
+.BR \*-u " or " \*-c
+Use Universal Time when setting and showing the date and time.
+.TP
+.BI "\*-r " seconds
+Output the date that corresponds to
+.I seconds
+past the epoch of 1970-01-01 00:00:00 UTC, where
+.I seconds
+should be an integer, either decimal, octal (leading 0), or
+hexadecimal (leading 0x), preceded by an optional sign.
+.SH FILES
+.ta \w'/usr/share/zoneinfo/posixrules\0\0'u
+/etc/localtime	local timezone file
+.br
+/usr/lib/locale/\f2L\fP/LC_TIME	description of time locale \f2L\fP
+.br
+/usr/share/zoneinfo	timezone information directory
+.br
+/usr/share/zoneinfo/posixrules	used with POSIX-style TZ's
+.br
+/usr/share/zoneinfo/GMT	for UTC leap seconds
+.sp
+If
+.B /usr/share/zoneinfo/GMT
+is absent,
+UTC leap seconds are loaded from
+.BR /usr/share/zoneinfo/posixrules .
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/date.c
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/date.c
@@ -0,0 +1,216 @@
+/* Display or set the current time and date.  */
+
+/* Copyright 1985, 1987, 1988 The Regents of the University of California.
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+   1. Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+   2. Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+   3. Neither the name of the University nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND
+   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+   ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+   OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+   SUCH DAMAGE.  */
+
+#include "private.h"
+#include <locale.h>
+#include <stdio.h>
+
+#if !HAVE_POSIX_DECLS
+extern char *		optarg;
+extern int		optind;
+#endif
+
+static int		retval = EXIT_SUCCESS;
+
+static void		display(const char *, time_t);
+static void		dogmt(void);
+static void		errensure(void);
+static void		timeout(FILE *, const char *, const struct tm *);
+ATTRIBUTE_NORETURN static void usage(void);
+
+int
+main(const int argc, char *argv[])
+{
+	register const char *	format = "+%+";
+	register int		ch;
+	register bool		rflag = false;
+	time_t			t;
+	intmax_t		secs;
+	char *			endarg;
+
+#ifdef LC_ALL
+	setlocale(LC_ALL, "");
+#endif /* defined(LC_ALL) */
+#if HAVE_GETTEXT
+# ifdef TZ_DOMAINDIR
+	bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
+# endif /* defined(TEXTDOMAINDIR) */
+	textdomain(TZ_DOMAIN);
+#endif /* HAVE_GETTEXT */
+	t = time(NULL);
+	while ((ch = getopt(argc, argv, "ucr:")) != EOF && ch != -1) {
+		switch (ch) {
+		default:
+			usage();
+		case 'u':		/* do it in UT */
+		case 'c':
+			dogmt();
+			break;
+		case 'r':		/* seconds since 1970 */
+			if (rflag) {
+				fprintf(stderr,
+					_("date: error: multiple -r's used"));
+				usage();
+			}
+			rflag = true;
+			errno = 0;
+			secs = strtoimax(optarg, &endarg, 0);
+			if (*endarg || optarg == endarg)
+				errno = EINVAL;
+			else if (! (TIME_T_MIN <= secs && secs <= TIME_T_MAX))
+				errno = ERANGE;
+			if (errno) {
+				perror(optarg);
+				errensure();
+				exit(retval);
+			}
+			t = secs;
+			break;
+		}
+	}
+	if (optind < argc) {
+	  if (argc - optind != 1) {
+	    fprintf(stderr,
+		    _("date: error: multiple operands in command line\n"));
+	    usage();
+	  }
+	  format = argv[optind];
+	  if (*format != '+') {
+	    fprintf(stderr, _("date: unknown operand: %s\n"), format);
+	    usage();
+	  }
+	}
+
+	display(format, t);
+	return retval;
+}
+
+static void
+dogmt(void)
+{
+	static char **	fakeenv;
+
+	if (fakeenv == NULL) {
+		static char	tzeutc0[] = "TZ=UTC0";
+		ptrdiff_t from, to, n;
+
+		for (n = 0;  environ[n] != NULL;  ++n)
+			continue;
+#if defined ckd_add && defined ckd_mul
+		if (!ckd_add(&n, n, 2) && !ckd_mul(&n, n, sizeof *fakeenv)
+		    && n <= SIZE_MAX)
+		  fakeenv = malloc(n);
+#else
+		if (n <= min(PTRDIFF_MAX, SIZE_MAX) / sizeof *fakeenv - 2)
+		  fakeenv = malloc((n + 2) * sizeof *fakeenv);
+#endif
+		if (fakeenv == NULL) {
+			fprintf(stderr, _("date: Memory exhausted\n"));
+			errensure();
+			exit(retval);
+		}
+		to = 0;
+		fakeenv[to++] = tzeutc0;
+		for (from = 1; environ[from] != NULL; ++from)
+			if (strncmp(environ[from], "TZ=", 3) != 0)
+				fakeenv[to++] = environ[from];
+		fakeenv[to] = NULL;
+		environ = fakeenv;
+	}
+}
+
+static void
+errensure(void)
+{
+	if (retval == EXIT_SUCCESS)
+		retval = EXIT_FAILURE;
+}
+
+static void
+usage(void)
+{
+	fprintf(stderr,
+		       _("date: usage: date [-u] [-c] [-r seconds]"
+			 " [+format]\n"));
+	errensure();
+	exit(retval);
+}
+
+static void
+display(char const *format, time_t now)
+{
+	struct tm *tmp;
+
+	tmp = localtime(&now);
+	if (!tmp) {
+		fprintf(stderr,
+			_("date: error: time out of range\n"));
+		errensure();
+		return;
+	}
+	timeout(stdout, format, tmp);
+	putchar('\n');
+	fflush(stdout);
+	fflush(stderr);
+	if (ferror(stdout) || ferror(stderr)) {
+		fprintf(stderr,
+			_("date: error: couldn't write results\n"));
+		errensure();
+	}
+}
+
+static void
+timeout(FILE *fp, char const *format, struct tm const *tmp)
+{
+	char *cp = NULL;
+	ptrdiff_t result;
+	ptrdiff_t size = 1024 / 2;
+
+	for ( ; ; ) {
+#ifdef ckd_mul
+		bool bigger = !ckd_mul(&size, size, 2) && size <= SIZE_MAX;
+#else
+		bool bigger = (size <= min(PTRDIFF_MAX, SIZE_MAX) / 2
+			       && (size *= 2, true));
+#endif
+		char *newcp = bigger ? realloc(cp, size) : NULL;
+		if (!newcp) {
+			fprintf(stderr,
+				_("date: error: can't get memory\n"));
+			errensure();
+			exit(retval);
+		}
+		cp = newcp;
+		result = strftime(cp, size, format, tmp);
+		if (result != 0)
+			break;
+	}
+	fwrite(cp + 1, 1, result - 1, fp);
+	free(cp);
+}
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/difftime.c
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/difftime.c
@@ -0,0 +1,60 @@
+/* Return the difference between two timestamps.  */
+
+/*
+** This file is in the public domain, so clarified as of
+** 1996-06-05 by Arthur David Olson.
+*/
+
+/*LINTLIBRARY*/
+
+#include "private.h"	/* for time_t and TYPE_SIGNED */
+
+/* Return -X as a double.  Using this avoids casting to 'double'.  */
+static double
+dminus(double x)
+{
+  return -x;
+}
+
+double
+difftime(time_t time1, time_t time0)
+{
+	/*
+	** If double is large enough, simply convert and subtract
+	** (assuming that the larger type has more precision).
+	*/
+	if (sizeof(time_t) < sizeof(double)) {
+	  double t1 = time1, t0 = time0;
+	  return t1 - t0;
+	}
+
+	/*
+	** The difference of two unsigned values can't overflow
+	** if the minuend is greater than or equal to the subtrahend.
+	*/
+	if (!TYPE_SIGNED(time_t))
+	  return time0 <= time1 ? time1 - time0 : dminus(time0 - time1);
+
+	/* Use uintmax_t if wide enough.  */
+	if (sizeof(time_t) <= sizeof(uintmax_t)) {
+	  uintmax_t t1 = time1, t0 = time0;
+	  return time0 <= time1 ? t1 - t0 : dminus(t0 - t1);
+	}
+
+	/*
+	** Handle cases where both time1 and time0 have the same sign
+	** (meaning that their difference cannot overflow).
+	*/
+	if ((time1 < 0) == (time0 < 0))
+	  return time1 - time0;
+
+	/*
+	** The values have opposite signs and uintmax_t is too narrow.
+	** This suffers from double rounding; attempt to lessen that
+	** by using long double temporaries.
+	*/
+	{
+	  long double t1 = time1, t0 = time0;
+	  return t1 - t0;
+	}
+}
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/etcetera
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/etcetera
@@ -0,0 +1,79 @@
+# tzdb data for ships at sea and other miscellany
+
+# This file is in the public domain, so clarified as of
+# 2009-05-17 by Arthur David Olson.
+
+# These entries are for uses not otherwise covered by the tz database.
+# Their main practical use is for platforms like Android that lack
+# support for POSIX-style TZ strings.  On such platforms these entries
+# can be useful if the timezone database is wrong or if a ship or
+# aircraft at sea is not in a timezone.
+
+# Starting with POSIX 1003.1-2001, the entries below are all
+# unnecessary as settings for the TZ environment variable.  E.g.,
+# instead of TZ='Etc/GMT+4' one can use the POSIX setting TZ='<-04>+4'.
+#
+# Do not use a POSIX TZ setting like TZ='GMT+4', which is four hours
+# behind GMT but uses the completely misleading abbreviation "GMT".
+
+# The following zone is used by tzcode functions like gmtime,
+# which load the "UTC" file to handle seconds properly.
+Zone	Etc/UTC		0	-	UTC
+
+# Functions like gmtime load the "GMT" file to handle leap seconds properly.
+# Vanguard section, which works with most .zi parsers.
+#Zone	GMT		0	-	GMT
+# Rearguard section, for TZUpdater 2.3.2 and earlier.
+Zone	Etc/GMT		0	-	GMT
+
+# The following link uses older naming conventions,
+# but it belongs here, not in the file 'backward',
+# as it is needed for tzcode releases through 2022a,
+# where functions like gmtime load "GMT" instead of the "Etc/UTC".
+# We want this to work even on installations that omit 'backward'.
+Link	Etc/GMT				GMT
+# End of rearguard section.
+
+# Be consistent with POSIX TZ settings in the Zone names,
+# even though this is the opposite of what many people expect.
+# POSIX has positive signs west of Greenwich, but many people expect
+# positive signs east of Greenwich.  For example, TZ='Etc/GMT+4' uses
+# the abbreviation "-04" and corresponds to 4 hours behind UT
+# (i.e. west of Greenwich) even though many people would expect it to
+# mean 4 hours ahead of UT (i.e. east of Greenwich).
+
+# Earlier incarnations of this package were not POSIX-compliant,
+# and had lines such as
+#		Zone	GMT-12		-12	-	GMT-1200
+# We did not want things to change quietly if someone accustomed to the old
+# way does a
+#		zic -l GMT-12
+# so we moved the names into the Etc subdirectory.
+# Also, the time zone abbreviations are now compatible with %z.
+
+Zone	Etc/GMT-14	14	-	+14
+Zone	Etc/GMT-13	13	-	+13
+Zone	Etc/GMT-12	12	-	+12
+Zone	Etc/GMT-11	11	-	+11
+Zone	Etc/GMT-10	10	-	+10
+Zone	Etc/GMT-9	9	-	+09
+Zone	Etc/GMT-8	8	-	+08
+Zone	Etc/GMT-7	7	-	+07
+Zone	Etc/GMT-6	6	-	+06
+Zone	Etc/GMT-5	5	-	+05
+Zone	Etc/GMT-4	4	-	+04
+Zone	Etc/GMT-3	3	-	+03
+Zone	Etc/GMT-2	2	-	+02
+Zone	Etc/GMT-1	1	-	+01
+Zone	Etc/GMT+1	-1	-	-01
+Zone	Etc/GMT+2	-2	-	-02
+Zone	Etc/GMT+3	-3	-	-03
+Zone	Etc/GMT+4	-4	-	-04
+Zone	Etc/GMT+5	-5	-	-05
+Zone	Etc/GMT+6	-6	-	-06
+Zone	Etc/GMT+7	-7	-	-07
+Zone	Etc/GMT+8	-8	-	-08
+Zone	Etc/GMT+9	-9	-	-09
+Zone	Etc/GMT+10	-10	-	-10
+Zone	Etc/GMT+11	-11	-	-11
+Zone	Etc/GMT+12	-12	-	-12
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/europe
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/europe
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/factory
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/factory
@@ -0,0 +1,12 @@
+# tzdb data for noncommittal factory settings
+
+# This file is in the public domain, so clarified as of
+# 2009-05-17 by Arthur David Olson.
+
+# For distributors who don't want to specify a timezone in their
+# installation procedures.  Users who run 'date' will get the
+# time zone abbreviation "-00", indicating that the actual time zone
+# is unknown.
+
+# Zone	NAME	STDOFF	RULES	FORMAT
+Zone	Factory	0	-	-00
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/iso3166.tab
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/iso3166.tab
@@ -0,0 +1,274 @@
+# ISO 3166 alpha-2 country codes
+#
+# This file is in the public domain, so clarified as of
+# 2009-05-17 by Arthur David Olson.
+#
+# From Paul Eggert (2022-11-18):
+# This file contains a table of two-letter country codes.  Columns are
+# separated by a single tab.  Lines beginning with '#' are comments.
+# All text uses UTF-8 encoding.  The columns of the table are as follows:
+#
+# 1.  ISO 3166-1 alpha-2 country code, current as of
+#     ISO 3166-1 N1087 (2022-09-02).  See: Updates on ISO 3166-1
+#     https://isotc.iso.org/livelink/livelink/Open/16944257
+# 2.  The usual English name for the coded region,
+#     chosen so that alphabetic sorting of subsets produces helpful lists.
+#     This is not the same as the English name in the ISO 3166 tables.
+#
+# The table is sorted by country code.
+#
+# This table is intended as an aid for users, to help them select time
+# zone data appropriate for their practical needs.  It is not intended
+# to take or endorse any position on legal or territorial claims.
+#
+#country-
+#code	name of country, territory, area, or subdivision
+AD	Andorra
+AE	United Arab Emirates
+AF	Afghanistan
+AG	Antigua & Barbuda
+AI	Anguilla
+AL	Albania
+AM	Armenia
+AO	Angola
+AQ	Antarctica
+AR	Argentina
+AS	Samoa (American)
+AT	Austria
+AU	Australia
+AW	Aruba
+AX	Åland Islands
+AZ	Azerbaijan
+BA	Bosnia & Herzegovina
+BB	Barbados
+BD	Bangladesh
+BE	Belgium
+BF	Burkina Faso
+BG	Bulgaria
+BH	Bahrain
+BI	Burundi
+BJ	Benin
+BL	St Barthelemy
+BM	Bermuda
+BN	Brunei
+BO	Bolivia
+BQ	Caribbean NL
+BR	Brazil
+BS	Bahamas
+BT	Bhutan
+BV	Bouvet Island
+BW	Botswana
+BY	Belarus
+BZ	Belize
+CA	Canada
+CC	Cocos (Keeling) Islands
+CD	Congo (Dem. Rep.)
+CF	Central African Rep.
+CG	Congo (Rep.)
+CH	Switzerland
+CI	Côte d'Ivoire
+CK	Cook Islands
+CL	Chile
+CM	Cameroon
+CN	China
+CO	Colombia
+CR	Costa Rica
+CU	Cuba
+CV	Cape Verde
+CW	Curaçao
+CX	Christmas Island
+CY	Cyprus
+CZ	Czech Republic
+DE	Germany
+DJ	Djibouti
+DK	Denmark
+DM	Dominica
+DO	Dominican Republic
+DZ	Algeria
+EC	Ecuador
+EE	Estonia
+EG	Egypt
+EH	Western Sahara
+ER	Eritrea
+ES	Spain
+ET	Ethiopia
+FI	Finland
+FJ	Fiji
+FK	Falkland Islands
+FM	Micronesia
+FO	Faroe Islands
+FR	France
+GA	Gabon
+GB	Britain (UK)
+GD	Grenada
+GE	Georgia
+GF	French Guiana
+GG	Guernsey
+GH	Ghana
+GI	Gibraltar
+GL	Greenland
+GM	Gambia
+GN	Guinea
+GP	Guadeloupe
+GQ	Equatorial Guinea
+GR	Greece
+GS	South Georgia & the South Sandwich Islands
+GT	Guatemala
+GU	Guam
+GW	Guinea-Bissau
+GY	Guyana
+HK	Hong Kong
+HM	Heard Island & McDonald Islands
+HN	Honduras
+HR	Croatia
+HT	Haiti
+HU	Hungary
+ID	Indonesia
+IE	Ireland
+IL	Israel
+IM	Isle of Man
+IN	India
+IO	British Indian Ocean Territory
+IQ	Iraq
+IR	Iran
+IS	Iceland
+IT	Italy
+JE	Jersey
+JM	Jamaica
+JO	Jordan
+JP	Japan
+KE	Kenya
+KG	Kyrgyzstan
+KH	Cambodia
+KI	Kiribati
+KM	Comoros
+KN	St Kitts & Nevis
+KP	Korea (North)
+KR	Korea (South)
+KW	Kuwait
+KY	Cayman Islands
+KZ	Kazakhstan
+LA	Laos
+LB	Lebanon
+LC	St Lucia
+LI	Liechtenstein
+LK	Sri Lanka
+LR	Liberia
+LS	Lesotho
+LT	Lithuania
+LU	Luxembourg
+LV	Latvia
+LY	Libya
+MA	Morocco
+MC	Monaco
+MD	Moldova
+ME	Montenegro
+MF	St Martin (French)
+MG	Madagascar
+MH	Marshall Islands
+MK	North Macedonia
+ML	Mali
+MM	Myanmar (Burma)
+MN	Mongolia
+MO	Macau
+MP	Northern Mariana Islands
+MQ	Martinique
+MR	Mauritania
+MS	Montserrat
+MT	Malta
+MU	Mauritius
+MV	Maldives
+MW	Malawi
+MX	Mexico
+MY	Malaysia
+MZ	Mozambique
+NA	Namibia
+NC	New Caledonia
+NE	Niger
+NF	Norfolk Island
+NG	Nigeria
+NI	Nicaragua
+NL	Netherlands
+NO	Norway
+NP	Nepal
+NR	Nauru
+NU	Niue
+NZ	New Zealand
+OM	Oman
+PA	Panama
+PE	Peru
+PF	French Polynesia
+PG	Papua New Guinea
+PH	Philippines
+PK	Pakistan
+PL	Poland
+PM	St Pierre & Miquelon
+PN	Pitcairn
+PR	Puerto Rico
+PS	Palestine
+PT	Portugal
+PW	Palau
+PY	Paraguay
+QA	Qatar
+RE	Réunion
+RO	Romania
+RS	Serbia
+RU	Russia
+RW	Rwanda
+SA	Saudi Arabia
+SB	Solomon Islands
+SC	Seychelles
+SD	Sudan
+SE	Sweden
+SG	Singapore
+SH	St Helena
+SI	Slovenia
+SJ	Svalbard & Jan Mayen
+SK	Slovakia
+SL	Sierra Leone
+SM	San Marino
+SN	Senegal
+SO	Somalia
+SR	Suriname
+SS	South Sudan
+ST	Sao Tome & Principe
+SV	El Salvador
+SX	St Maarten (Dutch)
+SY	Syria
+SZ	Eswatini (Swaziland)
+TC	Turks & Caicos Is
+TD	Chad
+TF	French Southern Territories
+TG	Togo
+TH	Thailand
+TJ	Tajikistan
+TK	Tokelau
+TL	East Timor
+TM	Turkmenistan
+TN	Tunisia
+TO	Tonga
+TR	Turkey
+TT	Trinidad & Tobago
+TV	Tuvalu
+TW	Taiwan
+TZ	Tanzania
+UA	Ukraine
+UG	Uganda
+UM	US minor outlying islands
+US	United States
+UY	Uruguay
+UZ	Uzbekistan
+VA	Vatican City
+VC	St Vincent
+VE	Venezuela
+VG	Virgin Islands (UK)
+VI	Virgin Islands (US)
+VN	Vietnam
+VU	Vanuatu
+WF	Wallis & Futuna
+WS	Samoa (western)
+YE	Yemen
+YT	Mayotte
+ZA	South Africa
+ZM	Zambia
+ZW	Zimbabwe
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/leap-seconds.list
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/leap-seconds.list
@@ -0,0 +1,255 @@
+#
+#	In the following text, the symbol '#' introduces
+#	a comment, which continues from that symbol until
+#	the end of the line. A plain comment line has a
+#	whitespace character following the comment indicator.
+#	There are also special comment lines defined below.
+#	A special comment will always have a non-whitespace
+#	character in column 2.
+#
+#	A blank line should be ignored.
+#
+#	The following table shows the corrections that must
+#	be applied to compute International Atomic Time (TAI)
+#	from the Coordinated Universal Time (UTC) values that
+#	are transmitted by almost all time services.
+#
+#	The first column shows an epoch as a number of seconds
+#	since 1 January 1900, 00:00:00 (1900.0 is also used to
+#	indicate the same epoch.) Both of these time stamp formats
+#	ignore the complexities of the time scales that were
+#	used before the current definition of UTC at the start
+#	of 1972. (See note 3 below.)
+#	The second column shows the number of seconds that
+#	must be added to UTC to compute TAI for any timestamp
+#	at or after that epoch. The value on each line is
+#	valid from the indicated initial instant until the
+#	epoch given on the next one or indefinitely into the
+#	future if there is no next line.
+#	(The comment on each line shows the representation of
+#	the corresponding initial epoch in the usual
+#	day-month-year format. The epoch always begins at
+#	00:00:00 UTC on the indicated day. See Note 5 below.)
+#
+#	Important notes:
+#
+#	1. Coordinated Universal Time (UTC) is often referred to
+#	as Greenwich Mean Time (GMT). The GMT time scale is no
+#	longer used, and the use of GMT to designate UTC is
+#	discouraged.
+#
+#	2. The UTC time scale is realized by many national
+#	laboratories and timing centers. Each laboratory
+#	identifies its realization with its name: Thus
+#	UTC(NIST), UTC(USNO), etc. The differences among
+#	these different realizations are typically on the
+#	order of a few nanoseconds (i.e., 0.000 000 00x s)
+#	and can be ignored for many purposes. These differences
+#	are tabulated in Circular T, which is published monthly
+#	by the International Bureau of Weights and Measures
+#	(BIPM). See www.bipm.org for more information.
+#
+#	3. The current definition of the relationship between UTC
+#	and TAI dates from 1 January 1972. A number of different
+#	time scales were in use before that epoch, and it can be
+#	quite difficult to compute precise timestamps and time
+#	intervals in those "prehistoric" days. For more information,
+#	consult:
+#
+#		The Explanatory Supplement to the Astronomical
+#		Ephemeris.
+#	or
+#		Terry Quinn, "The BIPM and the Accurate Measurement
+#		of Time," Proc. of the IEEE, Vol. 79, pp. 894-905,
+#		July, 1991. <http://dx.doi.org/10.1109/5.84965>
+#		reprinted in:
+#		   Christine Hackman and Donald B Sullivan (eds.)
+#		   Time and Frequency Measurement
+#		   American Association of Physics Teachers (1996)
+#		   <http://tf.nist.gov/general/pdf/1168.pdf>, pp. 75-86
+#
+#	4. The decision to insert a leap second into UTC is currently
+#	the responsibility of the International Earth Rotation and
+#	Reference Systems Service. (The name was changed from the
+#	International Earth Rotation Service, but the acronym IERS
+#	is still used.)
+#
+#	Leap seconds are announced by the IERS in its Bulletin C.
+#
+#	See www.iers.org for more details.
+#
+#	Every national laboratory and timing center uses the
+#	data from the BIPM and the IERS to construct UTC(lab),
+#	their local realization of UTC.
+#
+#	Although the definition also includes the possibility
+#	of dropping seconds ("negative" leap seconds), this has
+#	never been done and is unlikely to be necessary in the
+#	foreseeable future.
+#
+#	5. If your system keeps time as the number of seconds since
+#	some epoch (e.g., NTP timestamps), then the algorithm for
+#	assigning a UTC time stamp to an event that happens during a positive
+#	leap second is not well defined. The official name of that leap
+#	second is 23:59:60, but there is no way of representing that time
+#	in these systems.
+#	Many systems of this type effectively stop the system clock for
+#	one second during the leap second and use a time that is equivalent
+#	to 23:59:59 UTC twice. For these systems, the corresponding TAI
+#	timestamp would be obtained by advancing to the next entry in the
+#	following table when the time equivalent to 23:59:59 UTC
+#	is used for the second time. Thus the leap second which
+#	occurred on 30 June 1972 at 23:59:59 UTC would have TAI
+#	timestamps computed as follows:
+#
+#	...
+#	30 June 1972 23:59:59 (2287785599, first time):	TAI= UTC + 10 seconds
+#	30 June 1972 23:59:60 (2287785599,second time):	TAI= UTC + 11 seconds
+#	1  July 1972 00:00:00 (2287785600)		TAI= UTC + 11 seconds
+#	...
+#
+#	If your system realizes the leap second by repeating 00:00:00 UTC twice
+#	(this is possible but not usual), then the advance to the next entry
+#	in the table must occur the second time that a time equivalent to
+#	00:00:00 UTC is used. Thus, using the same example as above:
+#
+#	...
+#       30 June 1972 23:59:59 (2287785599):		TAI= UTC + 10 seconds
+#       30 June 1972 23:59:60 (2287785600, first time):	TAI= UTC + 10 seconds
+#       1  July 1972 00:00:00 (2287785600,second time):	TAI= UTC + 11 seconds
+#	...
+#
+#	in both cases the use of timestamps based on TAI produces a smooth
+#	time scale with no discontinuity in the time interval. However,
+#	although the long-term behavior of the time scale is correct in both
+#	methods, the second method is technically not correct because it adds
+#	the extra second to the wrong day.
+#
+#	This complexity would not be needed for negative leap seconds (if they
+#	are ever used). The UTC time would skip 23:59:59 and advance from
+#	23:59:58 to 00:00:00 in that case. The TAI offset would decrease by
+#	1 second at the same instant. This is a much easier situation to deal
+#	with, since the difficulty of unambiguously representing the epoch
+#	during the leap second does not arise.
+#
+#	Some systems implement leap seconds by amortizing the leap second
+#	over the last few minutes of the day. The frequency of the local
+#	clock is decreased (or increased) to realize the positive (or
+#	negative) leap second. This method removes the time step described
+#	above. Although the long-term behavior of the time scale is correct
+#	in this case, this method introduces an error during the adjustment
+#	period both in time and in frequency with respect to the official
+#	definition of UTC.
+#
+#	Questions or comments to:
+#		Judah Levine
+#		Time and Frequency Division
+#		NIST
+#		Boulder, Colorado
+#		Judah.Levine@nist.gov
+#
+#	Last Update of leap second values:   8 July 2016
+#
+#	The following line shows this last update date in NTP timestamp
+#	format. This is the date on which the most recent change to
+#	the leap second data was added to the file. This line can
+#	be identified by the unique pair of characters in the first two
+#	columns as shown below.
+#
+#$	 3676924800
+#
+#	The NTP timestamps are in units of seconds since the NTP epoch,
+#	which is 1 January 1900, 00:00:00. The Modified Julian Day number
+#	corresponding to the NTP time stamp, X, can be computed as
+#
+#	X/86400 + 15020
+#
+#	where the first term converts seconds to days and the second
+#	term adds the MJD corresponding to the time origin defined above.
+#	The integer portion of the result is the integer MJD for that
+#	day, and any remainder is the time of day, expressed as the
+#	fraction of the day since 0 hours UTC. The conversion from day
+#	fraction to seconds or to hours, minutes, and seconds may involve
+#	rounding or truncation, depending on the method used in the
+#	computation.
+#
+#	The data in this file will be updated periodically as new leap
+#	seconds are announced. In addition to being entered on the line
+#	above, the update time (in NTP format) will be added to the basic
+#	file name leap-seconds to form the name leap-seconds.<NTP TIME>.
+#	In addition, the generic name leap-seconds.list will always point to
+#	the most recent version of the file.
+#
+#	This update procedure will be performed only when a new leap second
+#	is announced.
+#
+#	The following entry specifies the expiration date of the data
+#	in this file in units of seconds since the origin at the instant
+#	1 January 1900, 00:00:00. This expiration date will be changed
+#	at least twice per year whether or not a new leap second is
+#	announced. These semi-annual changes will be made no later
+#	than 1 June and 1 December of each year to indicate what
+#	action (if any) is to be taken on 30 June and 31 December,
+#	respectively. (These are the customary effective dates for new
+#	leap seconds.) This expiration date will be identified by a
+#	unique pair of characters in columns 1 and 2 as shown below.
+#	In the unlikely event that a leap second is announced with an
+#	effective date other than 30 June or 31 December, then this
+#	file will be edited to include that leap second as soon as it is
+#	announced or at least one month before the effective date
+#	(whichever is later).
+#	If an announcement by the IERS specifies that no leap second is
+#	scheduled, then only the expiration date of the file will
+#	be advanced to show that the information in the file is still
+#	current -- the update time stamp, the data and the name of the file
+#	will not change.
+#
+#	Updated through IERS Bulletin C64
+#	File expires on:  28 June 2023
+#
+#@	3896899200
+#
+2272060800	10	# 1 Jan 1972
+2287785600	11	# 1 Jul 1972
+2303683200	12	# 1 Jan 1973
+2335219200	13	# 1 Jan 1974
+2366755200	14	# 1 Jan 1975
+2398291200	15	# 1 Jan 1976
+2429913600	16	# 1 Jan 1977
+2461449600	17	# 1 Jan 1978
+2492985600	18	# 1 Jan 1979
+2524521600	19	# 1 Jan 1980
+2571782400	20	# 1 Jul 1981
+2603318400	21	# 1 Jul 1982
+2634854400	22	# 1 Jul 1983
+2698012800	23	# 1 Jul 1985
+2776982400	24	# 1 Jan 1988
+2840140800	25	# 1 Jan 1990
+2871676800	26	# 1 Jan 1991
+2918937600	27	# 1 Jul 1992
+2950473600	28	# 1 Jul 1993
+2982009600	29	# 1 Jul 1994
+3029443200	30	# 1 Jan 1996
+3076704000	31	# 1 Jul 1997
+3124137600	32	# 1 Jan 1999
+3345062400	33	# 1 Jan 2006
+3439756800	34	# 1 Jan 2009
+3550089600	35	# 1 Jul 2012
+3644697600	36	# 1 Jul 2015
+3692217600	37	# 1 Jan 2017
+#
+#	the following special comment contains the
+#	hash value of the data in this file computed
+#	use the secure hash algorithm as specified
+#	by FIPS 180-1. See the files in ~/pub/sha for
+#	the details of how this hash value is
+#	computed. Note that the hash computation
+#	ignores comments and whitespace characters
+#	in data lines. It includes the NTP values
+#	of both the last modification time and the
+#	expiration time of the file, but not the
+#	white space on those lines.
+#	the hash line is also ignored in the
+#	computation.
+#
+#h 	2c413af9 124e1031 f165174 ff527c6b 756ae00b
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/leapseconds.awk
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/leapseconds.awk
@@ -0,0 +1,240 @@
+# Generate zic format 'leapseconds' from NIST format 'leap-seconds.list'.
+
+# This file is in the public domain.
+
+# This program uses awk arithmetic.  POSIX requires awk to support
+# exact integer arithmetic only through 10**10, which means for NTP
+# timestamps this program works only to the year 2216, which is the
+# year 1900 plus 10**10 seconds.  However, in practice
+# POSIX-conforming awk implementations invariably use IEEE-754 double
+# and so support exact integers through 2**53.  By the year 2216,
+# POSIX will almost surely require at least 2**53 for awk, so for NTP
+# timestamps this program should be good until the year 285,428,681
+# (the year 1900 plus 2**53 seconds).  By then leap seconds will be
+# long obsolete, as the Earth will likely slow down so much that
+# there will be more than 25 hours per day and so some other scheme
+# will be needed.
+
+BEGIN {
+  print "# Allowance for leap seconds added to each time zone file."
+  print ""
+  print "# This file is in the public domain."
+  print ""
+  print "# This file is generated automatically from the data in the public-domain"
+  print "# NIST format leap-seconds.list file, which can be copied from"
+  print "# <ftp://ftp.nist.gov/pub/time/leap-seconds.list>"
+  print "# or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>."
+  print "# The NIST file is used instead of its IERS upstream counterpart"
+  print "# <https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list>"
+  print "# because under US law the NIST file is public domain"
+  print "# whereas the IERS file's copyright and license status is unclear."
+  print "# For more about leap-seconds.list, please see"
+  print "# The NTP Timescale and Leap Seconds"
+  print "# <https://www.eecis.udel.edu/~mills/leap.html>."
+  print ""
+  print "# The rules for leap seconds are specified in Annex 1 (Time scales) of:"
+  print "# Standard-frequency and time-signal emissions."
+  print "# International Telecommunication Union - Radiocommunication Sector"
+  print "# (ITU-R) Recommendation TF.460-6 (02/2002)"
+  print "# <https://www.itu.int/rec/R-REC-TF.460-6-200202-I/>."
+  print "# The International Earth Rotation and Reference Systems Service (IERS)"
+  print "# periodically uses leap seconds to keep UTC to within 0.9 s of UT1"
+  print "# (a proxy for Earth's angle in space as measured by astronomers)"
+  print "# and publishes leap second data in a copyrighted file"
+  print "# <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>."
+  print "# See: Levine J. Coordinated Universal Time and the leap second."
+  print "# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995"
+  print "# <https://ieeexplore.ieee.org/document/7909995>."
+  print ""
+  print "# There were no leap seconds before 1972, as no official mechanism"
+  print "# accounted for the discrepancy between atomic time (TAI) and the earth's"
+  print "# rotation.  The first (\"1 Jan 1972\") data line in leap-seconds.list"
+  print "# does not denote a leap second; it denotes the start of the current definition"
+  print "# of UTC."
+  print ""
+  print "# All leap-seconds are Stationary (S) at the given UTC time."
+  print "# The correction (+ or -) is made at the given time, so in the unlikely"
+  print "# event of a negative leap second, a line would look like this:"
+  print "# Leap	YEAR	MON	DAY	23:59:59	-	S"
+  print "# Typical lines look like this:"
+  print "# Leap	YEAR	MON	DAY	23:59:60	+	S"
+
+  monthabbr[ 1] = "Jan"
+  monthabbr[ 2] = "Feb"
+  monthabbr[ 3] = "Mar"
+  monthabbr[ 4] = "Apr"
+  monthabbr[ 5] = "May"
+  monthabbr[ 6] = "Jun"
+  monthabbr[ 7] = "Jul"
+  monthabbr[ 8] = "Aug"
+  monthabbr[ 9] = "Sep"
+  monthabbr[10] = "Oct"
+  monthabbr[11] = "Nov"
+  monthabbr[12] = "Dec"
+
+  sstamp_init()
+}
+
+# In case the input has CRLF form a la NIST.
+{ sub(/\r$/, "") }
+
+/^#[ \t]*[Uu]pdated through/ || /^#[ \t]*[Ff]ile expires on/ {
+    last_lines = last_lines $0 "\n"
+}
+
+/^#[$][ \t]/ { updated = $2 }
+/^#[@][ \t]/ { expires = $2 }
+
+/^[ \t]*#/ { next }
+
+{
+    NTP_timestamp = $1
+    TAI_minus_UTC = $2
+    if (old_TAI_minus_UTC) {
+	if (old_TAI_minus_UTC < TAI_minus_UTC) {
+	    sign = "23:59:60\t+"
+	} else {
+	    sign = "23:59:59\t-"
+	}
+	sstamp_to_ymdhMs(NTP_timestamp - 1, ss_NTP)
+	printf "Leap\t%d\t%s\t%d\t%s\tS\n", \
+	  ss_year, monthabbr[ss_month], ss_mday, sign
+    }
+    old_TAI_minus_UTC = TAI_minus_UTC
+}
+
+END {
+    sstamp_to_ymdhMs(expires, ss_NTP)
+
+    print ""
+    print "# UTC timestamp when this leap second list expires."
+    print "# Any additional leap seconds will come after this."
+    if (! EXPIRES_LINE) {
+      print "# This Expires line is commented out for now,"
+      print "# so that pre-2020a zic implementations do not reject this file."
+    }
+    printf "%sExpires %.4d\t%s\t%.2d\t%.2d:%.2d:%.2d\n", \
+      EXPIRES_LINE ? "" : "#", \
+      ss_year, monthabbr[ss_month], ss_mday, ss_hour, ss_min, ss_sec
+
+    # The difference between the NTP and POSIX epochs is 70 years
+    # (including 17 leap days), each 24 hours of 60 minutes of 60
+    # seconds each.
+    epoch_minus_NTP = ((1970 - 1900) * 365 + 17) * 24 * 60 * 60
+
+    print ""
+    print "# POSIX timestamps for the data in this file:"
+    sstamp_to_ymdhMs(updated, ss_NTP)
+    printf "#updated %d (%.4d-%.2d-%.2d %.2d:%.2d:%.2d UTC)\n", \
+      updated - epoch_minus_NTP, \
+      ss_year, ss_month, ss_mday, ss_hour, ss_min, ss_sec
+    sstamp_to_ymdhMs(expires, ss_NTP)
+    printf "#expires %d (%.4d-%.2d-%.2d %.2d:%.2d:%.2d UTC)\n", \
+      expires - epoch_minus_NTP, \
+      ss_year, ss_month, ss_mday, ss_hour, ss_min, ss_sec
+
+    printf "\n%s", last_lines
+}
+
+# sstamp_to_ymdhMs - convert seconds timestamp to date and time
+#
+# Call as:
+#
+#    sstamp_to_ymdhMs(sstamp, epoch_days)
+#
+# where:
+#
+#    sstamp - is the seconds timestamp.
+#    epoch_days - is the timestamp epoch in Gregorian days since 1600-03-01.
+#	ss_NTP is appropriate for an NTP sstamp.
+#
+# Both arguments should be nonnegative integers.
+# On return, the following variables are set based on sstamp:
+#
+#    ss_year	- Gregorian calendar year
+#    ss_month	- month of the year (1-January to 12-December)
+#    ss_mday	- day of the month (1-31)
+#    ss_hour	- hour (0-23)
+#    ss_min	- minute (0-59)
+#    ss_sec	- second (0-59)
+#    ss_wday	- day of week (0-Sunday to 6-Saturday)
+#
+# The function sstamp_init should be called prior to using sstamp_to_ymdhMs.
+
+function sstamp_init()
+{
+  # Days in month N, where March is month 0 and January month 10.
+  ss_mon_days[ 0] = 31
+  ss_mon_days[ 1] = 30
+  ss_mon_days[ 2] = 31
+  ss_mon_days[ 3] = 30
+  ss_mon_days[ 4] = 31
+  ss_mon_days[ 5] = 31
+  ss_mon_days[ 6] = 30
+  ss_mon_days[ 7] = 31
+  ss_mon_days[ 8] = 30
+  ss_mon_days[ 9] = 31
+  ss_mon_days[10] = 31
+
+  # Counts of days in a Gregorian year, quad-year, century, and quad-century.
+  ss_year_days = 365
+  ss_quadyear_days = ss_year_days * 4 + 1
+  ss_century_days = ss_quadyear_days * 25 - 1
+  ss_quadcentury_days = ss_century_days * 4 + 1
+
+  # Standard day epochs, suitable for epoch_days.
+  # ss_MJD = 94493
+  # ss_POSIX = 135080
+  ss_NTP = 109513
+}
+
+function sstamp_to_ymdhMs(sstamp, epoch_days, \
+			  quadcentury, century, quadyear, year, month, day)
+{
+  ss_hour = int(sstamp / 3600) % 24
+  ss_min = int(sstamp / 60) % 60
+  ss_sec = sstamp % 60
+
+  # Start with a count of days since 1600-03-01 Gregorian.
+  day = epoch_days + int(sstamp / (24 * 60 * 60))
+
+  # Compute a year-month-day date with days of the month numbered
+  # 0-30, months (March-February) numbered 0-11, and years that start
+  # start March 1 and end after the last day of February.  A quad-year
+  # starts on March 1 of a year evenly divisible by 4 and ends after
+  # the last day of February 4 years later.  A century starts on and
+  # ends before March 1 in years evenly divisible by 100.
+  # A quad-century starts on and ends before March 1 in years divisible
+  # by 400.  While the number of days in a quad-century is a constant,
+  # the number of days in each other time period can vary by 1.
+  # Any variation is in the last day of the time period (there might
+  # or might not be a February 29) where it is easy to deal with.
+
+  quadcentury = int(day / ss_quadcentury_days)
+  day -= quadcentury * ss_quadcentury_days
+  ss_wday = (day + 3) % 7
+  century = int(day / ss_century_days)
+  century -= century == 4
+  day -= century * ss_century_days
+  quadyear = int(day / ss_quadyear_days)
+  day -= quadyear * ss_quadyear_days
+  year = int(day / ss_year_days)
+  year -= year == 4
+  day -= year * ss_year_days
+  for (month = 0; month < 11; month++) {
+    if (day < ss_mon_days[month])
+      break
+    day -= ss_mon_days[month]
+  }
+
+  # Convert the date to a conventional day of month (1-31),
+  # month (1-12, January-December) and Gregorian year.
+  ss_mday = day + 1
+  if (month <= 9) {
+    ss_month = month + 3
+  } else {
+    ss_month = month - 9
+    year++
+  }
+  ss_year = 1600 + quadcentury * 400 + century * 100 + quadyear * 4 + year
+}
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/localtime.c
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/localtime.c
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/newctime.3
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/newctime.3
@@ -0,0 +1,344 @@
+.\" This file is in the public domain, so clarified as of
+.\" 2009-05-17 by Arthur David Olson.
+.TH NEWCTIME 3
+.SH NAME
+asctime, ctime, difftime, gmtime, localtime, mktime \- convert date and time
+.SH SYNOPSIS
+.nf
+.ie \n(.g .ds - \f(CR-\fP
+.el .ds - \-
+.B #include <time.h>
+.PP
+.BR "extern char *tzname[];" " /\(** (optional) \(**/"
+.PP
+.B char *ctime(time_t const *clock);
+.PP
+.B char *ctime_r(time_t const *clock, char *buf);
+.PP
+.B double difftime(time_t time1, time_t time0);
+.PP
+.B char *asctime(struct tm const *tm);
+.PP
+.B "char *asctime_r(struct tm const *restrict tm,"
+.B "    char *restrict result);"
+.PP
+.B struct tm *localtime(time_t const *clock);
+.PP
+.B "struct tm *localtime_r(time_t const *restrict clock,"
+.B "    struct tm *restrict result);"
+.PP
+.B "struct tm *localtime_rz(timezone_t restrict zone,"
+.B "    time_t const *restrict clock,"
+.B "    struct tm *restrict result);"
+.PP
+.B struct tm *gmtime(time_t const *clock);
+.PP
+.B "struct tm *gmtime_r(time_t const *restrict clock,"
+.B "    struct tm *restrict result);"
+.PP
+.B time_t mktime(struct tm *tm);
+.PP
+.B "time_t mktime_z(timezone_t restrict zone,"
+.B "    struct tm *restrict tm);"
+.PP
+.B cc ... \*-ltz
+.fi
+.SH DESCRIPTION
+.ie '\(en'' .ds en \-
+.el .ds en \(en
+.ie '\(lq'' .ds lq \&"\"
+.el .ds lq \(lq\"
+.ie '\(rq'' .ds rq \&"\"
+.el .ds rq \(rq\"
+.de q
+\\$3\*(lq\\$1\*(rq\\$2
+..
+The
+.B ctime
+function
+converts a long integer, pointed to by
+.IR clock ,
+and returns a pointer to a
+string of the form
+.br
+.ce
+.eo
+Thu Nov 24 18:22:48 1986\n\0
+.br
+.ec
+Years requiring fewer than four characters are padded with leading zeroes.
+For years longer than four characters, the string is of the form
+.br
+.ce
+.eo
+Thu Nov 24 18:22:48     81986\n\0
+.ec
+.br
+with five spaces before the year.
+These unusual formats are designed to make it less likely that older
+software that expects exactly 26 bytes of output will mistakenly output
+misleading values for out-of-range years.
+.PP
+The
+.BI * clock
+timestamp represents the time in seconds since 1970-01-01 00:00:00
+Coordinated Universal Time (UTC).
+The POSIX standard says that timestamps must be nonnegative
+and must ignore leap seconds.
+Many implementations extend POSIX by allowing negative timestamps,
+and can therefore represent timestamps that predate the
+introduction of UTC and are some other flavor of Universal Time (UT).
+Some implementations support leap seconds, in contradiction to POSIX.
+.PP
+The
+.B localtime
+and
+.B gmtime
+functions
+return pointers to
+.q "tm"
+structures, described below.
+The
+.B localtime
+function
+corrects for the time zone and any time zone adjustments
+(such as Daylight Saving Time in the United States).
+After filling in the
+.q "tm"
+structure,
+.B localtime
+sets the
+.BR tm_isdst 'th
+element of
+.B tzname
+to a pointer to a string that's the time zone abbreviation to be used with
+.BR localtime 's
+return value.
+.PP
+The
+.B gmtime
+function
+converts to Coordinated Universal Time.
+.PP
+The
+.B asctime
+function
+converts a time value contained in a
+.q "tm"
+structure to a string,
+as shown in the above example,
+and returns a pointer to the string.
+.PP
+The
+.B mktime
+function
+converts the broken-down time,
+expressed as local time,
+in the structure pointed to by
+.I tm
+into a calendar time value with the same encoding as that of the values
+returned by the
+.B time
+function.
+The original values of the
+.B tm_wday
+and
+.B tm_yday
+components of the structure are ignored,
+and the original values of the other components are not restricted
+to their normal ranges.
+(A positive or zero value for
+.B tm_isdst
+causes
+.B mktime
+to presume initially that daylight saving time
+respectively,
+is or is not in effect for the specified time.
+A negative value for
+.B tm_isdst
+causes the
+.B mktime
+function to attempt to divine whether daylight saving time is in effect
+for the specified time; in this case it does not use a consistent
+rule and may give a different answer when later
+presented with the same argument.)
+On successful completion, the values of the
+.B tm_wday
+and
+.B tm_yday
+components of the structure are set appropriately,
+and the other components are set to represent the specified calendar time,
+but with their values forced to their normal ranges; the final value of
+.B tm_mday
+is not set until
+.B tm_mon
+and
+.B tm_year
+are determined.
+The
+.B mktime
+function
+returns the specified calendar time;
+If the calendar time cannot be represented,
+it returns \-1.
+.PP
+The
+.B difftime
+function
+returns the difference between two calendar times,
+.RI ( time1
+\-
+.IR time0 ),
+expressed in seconds.
+.PP
+The
+.BR ctime_r ,
+.BR localtime_r ,
+.BR gmtime_r ,
+and
+.B asctime_r
+functions
+are like their unsuffixed counterparts, except that they accept an
+additional argument specifying where to store the result if successful.
+.PP
+The
+.B localtime_rz
+and
+.B mktime_z
+functions
+are like their unsuffixed counterparts, except that they accept an
+extra initial
+.B zone
+argument specifying the timezone to be used for conversion.
+If
+.B zone
+is null, UT is used; otherwise,
+.B zone
+should be have been allocated by
+.B tzalloc
+and should not be freed until after all uses (e.g., by calls to
+.BR strftime )
+of the filled-in
+.B tm_zone
+fields.
+.PP
+Declarations of all the functions and externals, and the
+.q "tm"
+structure,
+are in the
+.B <time.h>
+header file.
+The structure (of type)
+.B struct tm
+includes the following fields:
+.RS
+.PP
+.nf
+.ta 2n +\w'long tm_gmtoff;nn'u
+	int tm_sec;	/\(** seconds (0\*(en60) \(**/
+	int tm_min;	/\(** minutes (0\*(en59) \(**/
+	int tm_hour;	/\(** hours (0\*(en23) \(**/
+	int tm_mday;	/\(** day of month (1\*(en31) \(**/
+	int tm_mon;	/\(** month of year (0\*(en11) \(**/
+	int tm_year;	/\(** year \- 1900 \(**/
+	int tm_wday;	/\(** day of week (Sunday = 0) \(**/
+	int tm_yday;	/\(** day of year (0\*(en365) \(**/
+	int tm_isdst;	/\(** is daylight saving time in effect? \(**/
+	char \(**tm_zone;	/\(** time zone abbreviation (optional) \(**/
+	long tm_gmtoff;	/\(** offset from UT in seconds (optional) \(**/
+.fi
+.RE
+.PP
+The
+.B tm_isdst
+field
+is non-zero if daylight saving time is in effect.
+.PP
+The
+.B tm_gmtoff
+field
+is the offset (in seconds) of the time represented
+from UT, with positive values indicating east
+of the Prime Meridian.
+The field's name is derived from Greenwich Mean Time, a precursor of UT.
+.PP
+In
+.B "struct tm"
+the
+.B tm_zone
+and
+.B tm_gmtoff
+fields exist, and are filled in, only if arrangements to do
+so were made when the library containing these functions was
+created.
+Similarly, the
+.B tzname
+variable is optional; also, there is no guarantee that
+.B tzname
+will
+continue to exist in this form in future releases of this code.
+.SH FILES
+.ta \w'/usr/share/zoneinfo/posixrules\0\0'u
+/usr/share/zoneinfo	timezone information directory
+.br
+/usr/share/zoneinfo/localtime	local timezone file
+.br
+/usr/share/zoneinfo/posixrules	used with POSIX-style TZ's
+.br
+/usr/share/zoneinfo/GMT	for UTC leap seconds
+.sp
+If
+.B /usr/share/zoneinfo/GMT
+is absent,
+UTC leap seconds are loaded from
+.BR /usr/share/zoneinfo/posixrules .
+.SH SEE ALSO
+getenv(3),
+newstrftime(3),
+newtzset(3),
+time(2),
+tzfile(5)
+.SH NOTES
+The return values of
+.BR asctime ,
+.BR ctime ,
+.BR gmtime ,
+and
+.B localtime
+point to static data
+overwritten by each call.
+The
+.B tzname
+variable (once set) and the
+.B tm_zone
+field of a returned
+.B "struct tm"
+both point to an array of characters that
+can be freed or overwritten by later calls to the functions
+.BR localtime ,
+.BR tzfree ,
+and
+.BR tzset ,
+if these functions affect the timezone information that specifies the
+abbreviation in question.
+The remaining functions and data are thread-safe.
+.PP
+The
+.BR asctime ,
+.BR asctime_r ,
+.BR ctime ,
+and
+.B ctime_r
+functions
+behave strangely for years before 1000 or after 9999.
+The 1989 and 1999 editions of the C Standard say
+that years from \-99 through 999 are converted without
+extra spaces, but this conflicts with longstanding
+tradition and with this implementation.
+The 2011 edition says that the behavior
+is undefined if the year is before 1000 or after 9999.
+Traditional implementations of these two functions are
+restricted to years in the range 1900 through 2099.
+To avoid this portability mess, new programs should use
+.B strftime
+instead.
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/newstrftime.3
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/newstrftime.3
@@ -0,0 +1,290 @@
+.\" strftime man page
+.\"
+.\" Based on the UCB file whose corrected copyright information appears below.
+.\" Copyright 1989, 1991 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the American National Standards Committee X3, on Information
+.\" Processing Systems.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     from: @(#)strftime.3	5.12 (Berkeley) 6/29/91
+.\"	$Id: strftime.3,v 1.4 1993/12/15 20:33:00 jtc Exp $
+.\"
+.TH NEWSTRFTIME 3
+.SH NAME
+strftime \- format date and time
+.SH SYNOPSIS
+.nf
+.ie \n(.g .ds - \f(CR-\fP
+.el .ds - \-
+.B #include <time.h>
+.PP
+.B "size_t strftime(char *restrict buf, size_t maxsize,"
+.B "    char const *restrict format, struct tm const *restrict timeptr);"
+.PP
+.B cc ... \-ltz
+.fi
+.SH DESCRIPTION
+.ie '\(lq'' .ds lq \&"\"
+.el .ds lq \(lq\"
+.ie '\(rq'' .ds rq \&"\"
+.el .ds rq \(rq\"
+.de c
+.ie \n(.g \f(CR\\$1\fP\\$2
+.el \\$1\\$2
+..
+.de q
+\\$3\*(lq\\$1\*(rq\\$2
+..
+The
+.B strftime
+function formats the information from
+.I timeptr
+into the array pointed to by
+.I buf
+according to the string pointed to by
+.IR format .
+.PP
+The
+.I format
+string consists of zero or more conversion specifications and
+ordinary characters.
+All ordinary characters are copied directly into the array.
+A conversion specification consists of a percent sign
+.Ql %
+and one other character.
+.PP
+No more than
+.I maxsize
+bytes are placed into the array.
+.PP
+Each conversion specification is replaced by the characters as
+follows which are then copied into the array.
+.TP
+%A
+is replaced by the locale's full weekday name.
+.TP
+%a
+is replaced by the locale's abbreviated weekday name.
+.TP
+%B
+is replaced by the locale's full month name.
+.TP
+%b or %h
+is replaced by the locale's abbreviated month name.
+.TP
+%C
+is replaced by the century (a year divided by 100 and truncated to an integer)
+as a decimal number [00,99].
+.TP
+%c
+is replaced by the locale's appropriate date and time representation.
+.TP
+%D
+is equivalent to
+.c %m/%d/%y .
+.TP
+%d
+is replaced by the day of the month as a decimal number [01,31].
+.TP
+%e
+is replaced by the day of month as a decimal number [1,31];
+single digits are preceded by a blank.
+.TP
+%F
+is equivalent to
+.c %Y-%m-%d
+(the ISO 8601 date format).
+.TP
+%G
+is replaced by the ISO 8601 year with century as a decimal number.
+See also the
+.c %V
+conversion specification.
+.TP
+%g
+is replaced by the ISO 8601 year without century as a decimal number [00,99].
+This is the year that includes the greater part of the week.
+(Monday as the first day of a week).
+See also the
+.c %V
+conversion specification.
+.TP
+%H
+is replaced by the hour (24-hour clock) as a decimal number [00,23].
+.TP
+%I
+is replaced by the hour (12-hour clock) as a decimal number [01,12].
+.TP
+%j
+is replaced by the day of the year as a decimal number [001,366].
+.TP
+%k
+is replaced by the hour (24-hour clock) as a decimal number [0,23];
+single digits are preceded by a blank.
+.TP
+%l
+is replaced by the hour (12-hour clock) as a decimal number [1,12];
+single digits are preceded by a blank.
+.TP
+%M
+is replaced by the minute as a decimal number [00,59].
+.TP
+%m
+is replaced by the month as a decimal number [01,12].
+.TP
+%n
+is replaced by a newline.
+.TP
+%p
+is replaced by the locale's equivalent of either
+.q AM
+or
+.q PM .
+.TP
+%R
+is replaced by the time in the format
+.c %H:%M .
+.TP
+%r
+is replaced by the locale's representation of 12-hour clock time
+using AM/PM notation.
+.TP
+%S
+is replaced by the second as a decimal number [00,60].
+The range of
+seconds is [00,60] instead of [00,59] to allow for the periodic occurrence
+of leap seconds.
+.TP
+%s
+is replaced by the number of seconds since the Epoch (see
+.BR ctime (3)).
+.TP
+%T
+is replaced by the time in the format
+.c %H:%M:%S .
+.TP
+%t
+is replaced by a tab.
+.TP
+%U
+is replaced by the week number of the year (Sunday as the first day of
+the week) as a decimal number [00,53].
+.TP
+%u
+is replaced by the weekday (Monday as the first day of the week)
+as a decimal number [1,7].
+.TP
+%V
+is replaced by the week number of the year (Monday as the first day of
+the week) as a decimal number [01,53].  If the week containing January
+1 has four or more days in the new year, then it is week 1; otherwise
+it is week 53 of the previous year, and the next week is week 1.
+The year is given by the
+.c %G
+conversion specification.
+.TP
+%W
+is replaced by the week number of the year (Monday as the first day of
+the week) as a decimal number [00,53].
+.TP
+%w
+is replaced by the weekday (Sunday as the first day of the week)
+as a decimal number [0,6].
+.TP
+%X
+is replaced by the locale's appropriate time representation.
+.TP
+%x
+is replaced by the locale's appropriate date representation.
+.TP
+%Y
+is replaced by the year with century as a decimal number.
+.TP
+%y
+is replaced by the year without century as a decimal number [00,99].
+.TP
+%Z
+is replaced by the time zone abbreviation,
+or by the empty string if this is not determinable.
+.TP
+%z
+is replaced by the offset from the Prime Meridian
+in the format +HHMM or \*-HHMM (ISO 8601) as appropriate,
+with positive values representing locations east of Greenwich,
+or by the empty string if this is not determinable.
+The numeric time zone abbreviation \*-0000 is used when the time is
+Universal Time
+but local time is indeterminate; by convention this is used for
+locations while uninhabited, and corresponds to a zero offset when the
+time zone abbreviation begins with
+.q "\*-" .
+.TP
+%%
+is replaced by a single %.
+.TP
+%+
+is replaced by the locale's date and time in
+.BR date (1)
+format.
+.SH "RETURN VALUE"
+If the conversion is successful,
+.B strftime
+returns the number of bytes placed into the array, not counting the
+terminating NUL;
+.B errno
+is unchanged if the returned value is zero.
+Otherwise,
+.B errno
+is set to indicate the error, zero is returned,
+and the array contents are unspecified.
+.SH ERRORS
+This function fails if:
+.TP
+[ERANGE]
+The total number of resulting bytes, including the terminating
+NUL character, is more than
+.IR maxsize .
+.PP
+This function may fail if:
+.TP
+[EOVERFLOW]
+The format includes an
+.c %s
+conversion and the number of seconds since the Epoch cannot be represented
+in a
+.c time_t .
+.SH SEE ALSO
+date(1),
+getenv(3),
+newctime(3),
+newtzset(3),
+time(2),
+tzfile(5)
+.SH BUGS
+There is no conversion specification for the phase of the moon.
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/newtzset.3
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/newtzset.3
@@ -0,0 +1,350 @@
+.\" This file is in the public domain, so clarified as of
+.\" 2009-05-17 by Arthur David Olson.
+.TH NEWTZSET 3
+.SH NAME
+tzset \- initialize time conversion information
+.SH SYNOPSIS
+.nf
+.ie \n(.g .ds - \f(CR-\fP
+.el .ds - \-
+.B #include <time.h>
+.PP
+.B timezone_t tzalloc(char const *TZ);
+.PP
+.B void tzfree(timezone_t tz);
+.PP
+.B void tzset(void);
+.PP
+.B cc ... \*-ltz
+.fi
+.SH DESCRIPTION
+.ie '\(en'' .ds en \-
+.el .ds en \(en
+.ie '\(lq'' .ds lq \&"\"
+.el .ds lq \(lq\"
+.ie '\(rq'' .ds rq \&"\"
+.el .ds rq \(rq\"
+.de q
+\\$3\*(lq\\$1\*(rq\\$2
+..
+The
+.B tzalloc
+function
+allocates and returns a timezone object described by
+.BR TZ .
+If
+.B TZ
+is not a valid timezone description, or if the object cannot be allocated,
+.B tzalloc
+returns a null pointer and sets
+.BR errno .
+.PP
+The
+.B tzfree
+function
+frees a timezone object
+.BR tz ,
+which should have been successfully allocated by
+.BR tzalloc .
+This invalidates any
+.B tm_zone
+pointers that
+.B tz
+was used to set.
+.PP
+The
+.B tzset
+function
+acts like
+.BR tzalloc(getenv("TZ")) ,
+except it saves any resulting timezone object into internal
+storage that is accessed by
+.BR localtime ,
+.BR localtime_r ,
+and
+.BR mktime .
+The anonymous shared timezone object is freed by the next call to
+.BR tzset .
+If the implied call to
+.B tzalloc
+fails,
+.B tzset
+falls back on Universal Time (UT).
+.PP
+If
+.B TZ
+is null, the best available approximation to local (wall
+clock) time, as specified by the
+.BR tzfile (5)-format
+file
+.B localtime
+in the system time conversion information directory, is used.
+If
+.B TZ
+is the empty string,
+UT is used, with the abbreviation "UTC"
+and without leap second correction; please see
+.BR newctime (3)
+for more about UT, UTC, and leap seconds.  If
+.B TZ
+is nonnull and nonempty:
+.IP
+if the value begins with a colon, it is used as a pathname of a file
+from which to read the time conversion information;
+.IP
+if the value does not begin with a colon, it is first used as the
+pathname of a file from which to read the time conversion information,
+and, if that file cannot be read, is used directly as a specification of
+the time conversion information.
+.PP
+When
+.B TZ
+is used as a pathname, if it begins with a slash,
+it is used as an absolute pathname; otherwise,
+it is used as a pathname relative to a system time conversion information
+directory.
+The file must be in the format specified in
+.BR tzfile (5).
+.PP
+When
+.B TZ
+is used directly as a specification of the time conversion information,
+it must have the following syntax (spaces inserted for clarity):
+.IP
+\fIstd\|offset\fR[\fIdst\fR[\fIoffset\fR][\fB,\fIrule\fR]]
+.PP
+Where:
+.RS
+.TP 15
+.IR std " and " dst
+Three or more bytes that are the designation for the standard
+.RI ( std )
+or the alternative
+.RI ( dst ,
+such as daylight saving time)
+time zone.  Only
+.I std
+is required; if
+.I dst
+is missing, then daylight saving time does not apply in this locale.
+Upper- and lowercase letters are explicitly allowed.  Any characters
+except a leading colon
+.RB ( : ),
+digits, comma
+.RB ( , ),
+ASCII minus
+.RB ( \*- ),
+ASCII plus
+.RB ( + ),
+and NUL bytes are allowed.
+Alternatively, a designation can be surrounded by angle brackets
+.B <
+and
+.BR > ;
+in this case, the designation can contain any characters other than
+.B >
+and NUL.
+.TP
+.I offset
+Indicates the value one must add to the local time to arrive at
+Coordinated Universal Time.  The
+.I offset
+has the form:
+.RS
+.IP
+\fIhh\fR[\fB:\fImm\fR[\fB:\fIss\fR]]
+.RE
+.IP
+The minutes
+.RI ( mm )
+and seconds
+.RI ( ss )
+are optional.  The hour
+.RI ( hh )
+is required and may be a single digit.  The
+.I offset
+following
+.I std
+is required.  If no
+.I offset
+follows
+.IR dst ,
+daylight saving time is assumed to be one hour ahead of standard time.  One or
+more digits may be used; the value is always interpreted as a decimal
+number.  The hour must be between zero and 24, and the minutes (and
+seconds) \*(en if present \*(en between zero and 59.  If preceded by a
+.q "\*-" ,
+the time zone shall be east of the Prime Meridian; otherwise it shall be
+west (which may be indicated by an optional preceding
+.q "+" .
+.TP
+.I rule
+Indicates when to change to and back from daylight saving time.  The
+.I rule
+has the form:
+.RS
+.IP
+\fIdate\fB/\fItime\fB,\fIdate\fB/\fItime\fR
+.RE
+.IP
+where the first
+.I date
+describes when the change from standard to daylight saving time occurs and the
+second
+.I date
+describes when the change back happens.  Each
+.I time
+field describes when, in current local time, the change to the other
+time is made.
+As an extension to POSIX, daylight saving is assumed to be in effect
+all year if it begins January 1 at 00:00 and ends December 31 at
+24:00 plus the difference between daylight saving and standard time,
+leaving no room for standard time in the calendar.
+.IP
+The format of
+.I date
+is one of the following:
+.RS
+.TP 10
+.BI J n
+The Julian day
+.I n
+.RI "(1\ \(<=" "\ n\ " "\(<=\ 365).
+Leap days are not counted; that is, in all years \*(en including leap
+years \*(en February 28 is day 59 and March 1 is day 60.  It is
+impossible to explicitly refer to the occasional February 29.
+.TP
+.I n
+The zero-based Julian day
+.RI "(0\ \(<=" "\ n\ " "\(<=\ 365).
+Leap days are counted, and it is possible to refer to February 29.
+.TP
+.BI M m . n . d
+The
+.IR d' th
+day
+.RI "(0\ \(<=" "\ d\ " "\(<=\ 6)
+of week
+.I n
+of month
+.I m
+of the year
+.RI "(1\ \(<=" "\ n\ " "\(<=\ 5,
+.RI "1\ \(<=" "\ m\ " "\(<=\ 12,
+where week 5 means
+.q "the last \fId\fP day in month \fIm\fP"
+which may occur in either the fourth or the fifth week).  Week 1 is the
+first week in which the
+.IR d' th
+day occurs.  Day zero is Sunday.
+.RE
+.IP "" 15
+The
+.I time
+has the same format as
+.I offset
+except that POSIX does not allow a leading sign (\c
+.q "\*-"
+or
+.q "+" ).
+As an extension to POSIX, the hours part of
+.I time
+can range from \-167 through 167; this allows for unusual rules such
+as
+.q "the Saturday before the first Sunday of March" .
+The default, if
+.I time
+is not given, is
+.BR 02:00:00 .
+.RE
+.LP
+Here are some examples of
+.B TZ
+values that directly specify the timezone; they use some of the
+extensions to POSIX.
+.TP
+.B EST5
+stands for US Eastern Standard
+Time (EST), 5 hours behind UT, without daylight saving.
+.TP
+.B <+12>\*-12<+13>,M11.1.0,M1.2.1/147
+stands for Fiji time, 12 hours ahead
+of UT, springing forward on November's first Sunday at 02:00, and
+falling back on January's second Monday at 147:00 (i.e., 03:00 on the
+first Sunday on or after January 14).  The abbreviations for standard
+and daylight saving time are
+.q "+12"
+and
+.q "+13".
+.TP
+.B IST\*-2IDT,M3.4.4/26,M10.5.0
+stands for Israel Standard Time (IST) and Israel Daylight Time (IDT),
+2 hours ahead of UT, springing forward on March's fourth
+Thursday at 26:00 (i.e., 02:00 on the first Friday on or after March
+23), and falling back on October's last Sunday at 02:00.
+.TP
+.B <\*-04>4<\*-03>,J1/0,J365/25
+stands for permanent daylight saving time, 3 hours behind UT with
+abbreviation
+.q "\*-03".
+There is a dummy fall-back transition on December 31 at 25:00 daylight
+saving time (i.e., 24:00 standard time, equivalent to January 1 at
+00:00 standard time), and a simultaneous spring-forward transition on
+January 1 at 00:00 standard time, so daylight saving time is in effect
+all year and the initial
+.B <\*-04>
+is a placeholder.
+.TP
+.B <\*-03>3<\*-02>,M3.5.0/\*-2,M10.5.0/\*-1
+stands for time in western Greenland, 3 hours behind UT, where clocks
+follow the EU rules of
+springing forward on March's last Sunday at 01:00 UT (\-02:00 local
+time, i.e., 22:00 the previous day) and falling back on October's last
+Sunday at 01:00 UT (\-01:00 local time, i.e., 23:00 the previous day).
+The abbreviations for standard and daylight saving time are
+.q "\*-03"
+and
+.q "\*-02".
+.PP
+If no
+.I rule
+is present in
+.BR TZ ,
+the rules specified
+by the
+.BR tzfile (5)-format
+file
+.B posixrules
+in the system time conversion information directory are used, with the
+standard and daylight saving time offsets from UT replaced by those specified by
+the
+.I offset
+values in
+.BR TZ .
+.PP
+For compatibility with System V Release 3.1, a semicolon
+.RB ( ; )
+may be used to separate the
+.I rule
+from the rest of the specification.
+.SH FILES
+.ta \w'/usr/share/zoneinfo/posixrules\0\0'u
+/usr/share/zoneinfo	timezone information directory
+.br
+/usr/share/zoneinfo/localtime	local timezone file
+.br
+/usr/share/zoneinfo/posixrules	used with POSIX-style TZ
+.br
+/usr/share/zoneinfo/GMT	for UTC leap seconds
+.sp
+If
+.B /usr/share/zoneinfo/GMT
+is absent,
+UTC leap seconds are loaded from
+.BR /usr/share/zoneinfo/posixrules .
+.SH SEE ALSO
+getenv(3),
+newctime(3),
+newstrftime(3),
+time(2),
+tzfile(5)
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/northamerica
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/northamerica
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/private.h
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/private.h
@@ -0,0 +1,978 @@
+/* Private header for tzdb code.  */
+
+#ifndef PRIVATE_H
+
+#define PRIVATE_H
+
+/*
+** This file is in the public domain, so clarified as of
+** 1996-06-05 by Arthur David Olson.
+*/
+
+/*
+** This header is for use ONLY with the time conversion code.
+** There is no guarantee that it will remain unchanged,
+** or that it will remain at all.
+** Do NOT copy it to any system include directory.
+** Thank you!
+*/
+
+/* PORT_TO_C89 means the code should work even if the underlying
+   compiler and library support only C89.  SUPPORT_C89 means the
+   tzcode library should support C89 callers in addition to the usual
+   support for C99-and-later callers.  These macros are obsolescent,
+   and the plan is to remove them along with any code needed only when
+   they are nonzero.  */
+#ifndef PORT_TO_C89
+# define PORT_TO_C89 0
+#endif
+#ifndef SUPPORT_C89
+# define SUPPORT_C89 0
+#endif
+
+#ifndef __STDC_VERSION__
+# define __STDC_VERSION__ 0
+#endif
+
+/* Define true, false and bool if they don't work out of the box.  */
+#if PORT_TO_C89 && __STDC_VERSION__ < 199901
+# define true 1
+# define false 0
+# define bool int
+#elif __STDC_VERSION__ < 202311
+# include <stdbool.h>
+#endif
+
+/*
+** zdump has been made independent of the rest of the time
+** conversion package to increase confidence in the verification it provides.
+** You can use zdump to help in verifying other implementations.
+** To do this, compile with -DUSE_LTZ=0 and link without the tz library.
+*/
+#ifndef USE_LTZ
+# define USE_LTZ 1
+#endif
+
+/* This string was in the Factory zone through version 2016f.  */
+#define GRANDPARENTED	"Local time zone must be set--see zic manual page"
+
+/*
+** Defaults for preprocessor symbols.
+** You can override these in your C compiler options, e.g. '-DHAVE_GETTEXT=1'.
+*/
+
+#ifndef HAVE_DECL_ASCTIME_R
+# define HAVE_DECL_ASCTIME_R 1
+#endif
+
+#if !defined HAVE__GENERIC && defined __has_extension
+# if __has_extension(c_generic_selections)
+#  define HAVE__GENERIC 1
+# else
+#  define HAVE__GENERIC 0
+# endif
+#endif
+/* _Generic is buggy in pre-4.9 GCC.  */
+#if !defined HAVE__GENERIC && defined __GNUC__ && !defined __STRICT_ANSI__
+# define HAVE__GENERIC (4 < __GNUC__ + (9 <= __GNUC_MINOR__))
+#endif
+#ifndef HAVE__GENERIC
+# define HAVE__GENERIC (201112 <= __STDC_VERSION__)
+#endif
+
+#if !defined HAVE_GETTEXT && defined __has_include
+# if __has_include(<libintl.h>)
+#  define HAVE_GETTEXT true
+# endif
+#endif
+#ifndef HAVE_GETTEXT
+# define HAVE_GETTEXT false
+#endif
+
+#ifndef HAVE_INCOMPATIBLE_CTIME_R
+# define HAVE_INCOMPATIBLE_CTIME_R 0
+#endif
+
+#ifndef HAVE_LINK
+# define HAVE_LINK 1
+#endif /* !defined HAVE_LINK */
+
+#ifndef HAVE_MALLOC_ERRNO
+# define HAVE_MALLOC_ERRNO 1
+#endif
+
+#ifndef HAVE_POSIX_DECLS
+# define HAVE_POSIX_DECLS 1
+#endif
+
+#ifndef HAVE_SETENV
+# define HAVE_SETENV 1
+#endif
+
+#ifndef HAVE_STRDUP
+# define HAVE_STRDUP 1
+#endif
+
+#ifndef HAVE_SYMLINK
+# define HAVE_SYMLINK 1
+#endif /* !defined HAVE_SYMLINK */
+
+#if !defined HAVE_SYS_STAT_H && defined __has_include
+# if !__has_include(<sys/stat.h>)
+#  define HAVE_SYS_STAT_H false
+# endif
+#endif
+#ifndef HAVE_SYS_STAT_H
+# define HAVE_SYS_STAT_H true
+#endif
+
+#if !defined HAVE_UNISTD_H && defined __has_include
+# if !__has_include(<unistd.h>)
+#  define HAVE_UNISTD_H false
+# endif
+#endif
+#ifndef HAVE_UNISTD_H
+# define HAVE_UNISTD_H true
+#endif
+
+#ifndef NETBSD_INSPIRED
+# define NETBSD_INSPIRED 1
+#endif
+
+#if HAVE_INCOMPATIBLE_CTIME_R
+# define asctime_r _incompatible_asctime_r
+# define ctime_r _incompatible_ctime_r
+#endif /* HAVE_INCOMPATIBLE_CTIME_R */
+
+/* Enable tm_gmtoff, tm_zone, and environ on GNUish systems.  */
+#define _GNU_SOURCE 1
+/* Fix asctime_r on Solaris 11.  */
+#define _POSIX_PTHREAD_SEMANTICS 1
+/* Enable strtoimax on pre-C99 Solaris 11.  */
+#define __EXTENSIONS__ 1
+
+/* On GNUish systems where time_t might be 32 or 64 bits, use 64.
+   On these platforms _FILE_OFFSET_BITS must also be 64; otherwise
+   setting _TIME_BITS to 64 does not work.  The code does not
+   otherwise rely on _FILE_OFFSET_BITS being 64, since it does not
+   use off_t or functions like 'stat' that depend on off_t.  */
+#ifndef _FILE_OFFSET_BITS
+# define _FILE_OFFSET_BITS 64
+#endif
+#if !defined _TIME_BITS && _FILE_OFFSET_BITS == 64
+# define _TIME_BITS 64
+#endif
+
+/*
+** Nested includes
+*/
+
+/* Avoid clashes with NetBSD by renaming NetBSD's declarations.
+   If defining the 'timezone' variable, avoid a clash with FreeBSD's
+   'timezone' function by renaming its declaration.  */
+#define localtime_rz sys_localtime_rz
+#define mktime_z sys_mktime_z
+#define posix2time_z sys_posix2time_z
+#define time2posix_z sys_time2posix_z
+#if defined USG_COMPAT && USG_COMPAT == 2
+# define timezone sys_timezone
+#endif
+#define timezone_t sys_timezone_t
+#define tzalloc sys_tzalloc
+#define tzfree sys_tzfree
+#include <time.h>
+#undef localtime_rz
+#undef mktime_z
+#undef posix2time_z
+#undef time2posix_z
+#if defined USG_COMPAT && USG_COMPAT == 2
+# undef timezone
+#endif
+#undef timezone_t
+#undef tzalloc
+#undef tzfree
+
+#include <stddef.h>
+#include <string.h>
+#if !PORT_TO_C89
+# include <inttypes.h>
+#endif
+#include <limits.h>	/* for CHAR_BIT et al. */
+#include <stdlib.h>
+
+#include <errno.h>
+
+#ifndef EINVAL
+# define EINVAL ERANGE
+#endif
+
+#ifndef ELOOP
+# define ELOOP EINVAL
+#endif
+#ifndef ENAMETOOLONG
+# define ENAMETOOLONG EINVAL
+#endif
+#ifndef ENOMEM
+# define ENOMEM EINVAL
+#endif
+#ifndef ENOTSUP
+# define ENOTSUP EINVAL
+#endif
+#ifndef EOVERFLOW
+# define EOVERFLOW EINVAL
+#endif
+
+#if HAVE_GETTEXT
+# include <libintl.h>
+#endif /* HAVE_GETTEXT */
+
+#if HAVE_UNISTD_H
+# include <unistd.h> /* for R_OK, and other POSIX goodness */
+#endif /* HAVE_UNISTD_H */
+
+#ifndef HAVE_STRFTIME_L
+# if _POSIX_VERSION < 200809
+#  define HAVE_STRFTIME_L 0
+# else
+#  define HAVE_STRFTIME_L 1
+# endif
+#endif
+
+#ifndef USG_COMPAT
+# ifndef _XOPEN_VERSION
+#  define USG_COMPAT 0
+# else
+#  define USG_COMPAT 1
+# endif
+#endif
+
+#ifndef HAVE_TZNAME
+# if _POSIX_VERSION < 198808 && !USG_COMPAT
+#  define HAVE_TZNAME 0
+# else
+#  define HAVE_TZNAME 1
+# endif
+#endif
+
+#ifndef ALTZONE
+# if defined __sun || defined _M_XENIX
+#  define ALTZONE 1
+# else
+#  define ALTZONE 0
+# endif
+#endif
+
+#ifndef R_OK
+# define R_OK 4
+#endif /* !defined R_OK */
+
+#if PORT_TO_C89
+
+/*
+** Define HAVE_STDINT_H's default value here, rather than at the
+** start, since __GLIBC__ and INTMAX_MAX's values depend on
+** previously-included files.  glibc 2.1 and Solaris 10 and later have
+** stdint.h, even with pre-C99 compilers.
+*/
+#if !defined HAVE_STDINT_H && defined __has_include
+# define HAVE_STDINT_H true /* C23 __has_include implies C99 stdint.h.  */
+#endif
+#ifndef HAVE_STDINT_H
+# define HAVE_STDINT_H \
+   (199901 <= __STDC_VERSION__ \
+    || 2 < __GLIBC__ + (1 <= __GLIBC_MINOR__) \
+    || __CYGWIN__ || INTMAX_MAX)
+#endif /* !defined HAVE_STDINT_H */
+
+#if HAVE_STDINT_H
+# include <stdint.h>
+#endif /* !HAVE_STDINT_H */
+
+#ifndef HAVE_INTTYPES_H
+# define HAVE_INTTYPES_H HAVE_STDINT_H
+#endif
+#if HAVE_INTTYPES_H
+# include <inttypes.h>
+#endif
+
+/* Pre-C99 GCC compilers define __LONG_LONG_MAX__ instead of LLONG_MAX.  */
+#if defined __LONG_LONG_MAX__ && !defined __STRICT_ANSI__
+# ifndef LLONG_MAX
+#  define LLONG_MAX __LONG_LONG_MAX__
+# endif
+# ifndef LLONG_MIN
+#  define LLONG_MIN (-1 - LLONG_MAX)
+# endif
+# ifndef ULLONG_MAX
+#  define ULLONG_MAX (LLONG_MAX * 2ull + 1)
+# endif
+#endif
+
+#ifndef INT_FAST64_MAX
+# if 1 <= LONG_MAX >> 31 >> 31
+typedef long int_fast64_t;
+#  define INT_FAST64_MIN LONG_MIN
+#  define INT_FAST64_MAX LONG_MAX
+# else
+/* If this fails, compile with -DHAVE_STDINT_H or with a better compiler.  */
+typedef long long int_fast64_t;
+#  define INT_FAST64_MIN LLONG_MIN
+#  define INT_FAST64_MAX LLONG_MAX
+# endif
+#endif
+
+#ifndef PRIdFAST64
+# if INT_FAST64_MAX == LONG_MAX
+#  define PRIdFAST64 "ld"
+# else
+#  define PRIdFAST64 "lld"
+# endif
+#endif
+
+#ifndef SCNdFAST64
+# define SCNdFAST64 PRIdFAST64
+#endif
+
+#ifndef INT_FAST32_MAX
+# if INT_MAX >> 31 == 0
+typedef long int_fast32_t;
+#  define INT_FAST32_MAX LONG_MAX
+#  define INT_FAST32_MIN LONG_MIN
+# else
+typedef int int_fast32_t;
+#  define INT_FAST32_MAX INT_MAX
+#  define INT_FAST32_MIN INT_MIN
+# endif
+#endif
+
+#ifndef INTMAX_MAX
+# ifdef LLONG_MAX
+typedef long long intmax_t;
+#  ifndef HAVE_STRTOLL
+#   define HAVE_STRTOLL true
+#  endif
+#  if HAVE_STRTOLL
+#   define strtoimax strtoll
+#  endif
+#  define INTMAX_MAX LLONG_MAX
+#  define INTMAX_MIN LLONG_MIN
+# else
+typedef long intmax_t;
+#  define INTMAX_MAX LONG_MAX
+#  define INTMAX_MIN LONG_MIN
+# endif
+# ifndef strtoimax
+#  define strtoimax strtol
+# endif
+#endif
+
+#ifndef PRIdMAX
+# if INTMAX_MAX == LLONG_MAX
+#  define PRIdMAX "lld"
+# else
+#  define PRIdMAX "ld"
+# endif
+#endif
+
+#ifndef PTRDIFF_MAX
+# define PTRDIFF_MAX MAXVAL(ptrdiff_t, TYPE_BIT(ptrdiff_t))
+#endif
+
+#ifndef UINT_FAST32_MAX
+typedef unsigned long uint_fast32_t;
+#endif
+
+#ifndef UINT_FAST64_MAX
+# if 3 <= ULONG_MAX >> 31 >> 31
+typedef unsigned long uint_fast64_t;
+#  define UINT_FAST64_MAX ULONG_MAX
+# else
+/* If this fails, compile with -DHAVE_STDINT_H or with a better compiler.  */
+typedef unsigned long long uint_fast64_t;
+#  define UINT_FAST64_MAX ULLONG_MAX
+# endif
+#endif
+
+#ifndef UINTMAX_MAX
+# ifdef ULLONG_MAX
+typedef unsigned long long uintmax_t;
+# else
+typedef unsigned long uintmax_t;
+# endif
+#endif
+
+#ifndef PRIuMAX
+# ifdef ULLONG_MAX
+#  define PRIuMAX "llu"
+# else
+#  define PRIuMAX "lu"
+# endif
+#endif
+
+#ifndef SIZE_MAX
+# define SIZE_MAX ((size_t) -1)
+#endif
+
+#endif /* PORT_TO_C89 */
+
+/* Support ckd_add, ckd_sub, ckd_mul on C23 or recent-enough GCC-like
+   hosts, unless compiled with -DHAVE_STDCKDINT_H=0 or with pre-C23 EDG.  */
+#if !defined HAVE_STDCKDINT_H && defined __has_include
+# if __has_include(<stdckdint.h>)
+#  define HAVE_STDCKDINT_H true
+# endif
+#endif
+#ifdef HAVE_STDCKDINT_H
+# if HAVE_STDCKDINT_H
+#  include <stdckdint.h>
+# endif
+#elif defined __EDG__
+/* Do nothing, to work around EDG bug <https://bugs.gnu.org/53256>.  */
+#elif defined __has_builtin
+# if __has_builtin(__builtin_add_overflow)
+#  define ckd_add(r, a, b) __builtin_add_overflow(a, b, r)
+# endif
+# if __has_builtin(__builtin_sub_overflow)
+#  define ckd_sub(r, a, b) __builtin_sub_overflow(a, b, r)
+# endif
+# if __has_builtin(__builtin_mul_overflow)
+#  define ckd_mul(r, a, b) __builtin_mul_overflow(a, b, r)
+# endif
+#elif 7 <= __GNUC__
+# define ckd_add(r, a, b) __builtin_add_overflow(a, b, r)
+# define ckd_sub(r, a, b) __builtin_sub_overflow(a, b, r)
+# define ckd_mul(r, a, b) __builtin_mul_overflow(a, b, r)
+#endif
+
+#if 3 <= __GNUC__
+# define ATTRIBUTE_MALLOC __attribute__((malloc))
+# define ATTRIBUTE_FORMAT(spec) __attribute__((format spec))
+#else
+# define ATTRIBUTE_MALLOC /* empty */
+# define ATTRIBUTE_FORMAT(spec) /* empty */
+#endif
+
+#if (defined __has_c_attribute \
+     && (202311 <= __STDC_VERSION__ || !defined __STRICT_ANSI__))
+# define HAVE___HAS_C_ATTRIBUTE true
+#else
+# define HAVE___HAS_C_ATTRIBUTE false
+#endif
+
+#if HAVE___HAS_C_ATTRIBUTE
+# if __has_c_attribute(deprecated)
+#  define ATTRIBUTE_DEPRECATED [[deprecated]]
+# endif
+#endif
+#ifndef ATTRIBUTE_DEPRECATED
+# if 3 < __GNUC__ + (2 <= __GNUC_MINOR__)
+#  define ATTRIBUTE_DEPRECATED __attribute__((deprecated))
+# else
+#  define ATTRIBUTE_DEPRECATED /* empty */
+# endif
+#endif
+
+#if HAVE___HAS_C_ATTRIBUTE
+# if __has_c_attribute(fallthrough)
+#  define ATTRIBUTE_FALLTHROUGH [[fallthrough]]
+# endif
+#endif
+#ifndef ATTRIBUTE_FALLTHROUGH
+# if 7 <= __GNUC__
+#  define ATTRIBUTE_FALLTHROUGH __attribute__((fallthrough))
+# else
+#  define ATTRIBUTE_FALLTHROUGH ((void) 0)
+# endif
+#endif
+
+#if HAVE___HAS_C_ATTRIBUTE
+# if __has_c_attribute(maybe_unused)
+#  define ATTRIBUTE_MAYBE_UNUSED [[maybe_unused]]
+# endif
+#endif
+#ifndef ATTRIBUTE_MAYBE_UNUSED
+# if 2 < __GNUC__ + (7 <= __GNUC_MINOR__)
+#  define ATTRIBUTE_MAYBE_UNUSED __attribute__((unused))
+# else
+#  define ATTRIBUTE_MAYBE_UNUSED /* empty */
+# endif
+#endif
+
+#if HAVE___HAS_C_ATTRIBUTE
+# if __has_c_attribute(noreturn)
+#  define ATTRIBUTE_NORETURN [[noreturn]]
+# endif
+#endif
+#ifndef ATTRIBUTE_NORETURN
+# if 201112 <= __STDC_VERSION__
+#  define ATTRIBUTE_NORETURN _Noreturn
+# elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__)
+#  define ATTRIBUTE_NORETURN __attribute__((noreturn))
+# else
+#  define ATTRIBUTE_NORETURN /* empty */
+# endif
+#endif
+
+#if HAVE___HAS_C_ATTRIBUTE
+# if __has_c_attribute(reproducible)
+#  define ATTRIBUTE_REPRODUCIBLE [[reproducible]]
+# endif
+#endif
+#ifndef ATTRIBUTE_REPRODUCIBLE
+# if 3 <= __GNUC__
+#  define ATTRIBUTE_REPRODUCIBLE __attribute__((pure))
+# else
+#  define ATTRIBUTE_REPRODUCIBLE /* empty */
+# endif
+#endif
+
+#if HAVE___HAS_C_ATTRIBUTE
+# if __has_c_attribute(unsequenced)
+#  define ATTRIBUTE_UNSEQUENCED [[unsequenced]]
+# endif
+#endif
+#ifndef ATTRIBUTE_UNSEQUENCED
+# if 3 <= __GNUC__
+#  define ATTRIBUTE_UNSEQUENCED __attribute__((const))
+# else
+#  define ATTRIBUTE_UNSEQUENCED /* empty */
+# endif
+#endif
+
+#if PORT_TO_C89 && __STDC_VERSION__ < 199901 && !defined restrict
+# define restrict /* empty */
+#endif
+
+/*
+** Workarounds for compilers/systems.
+*/
+
+#ifndef EPOCH_LOCAL
+# define EPOCH_LOCAL 0
+#endif
+#ifndef EPOCH_OFFSET
+# define EPOCH_OFFSET 0
+#endif
+#ifndef RESERVE_STD_EXT_IDS
+# define RESERVE_STD_EXT_IDS 0
+#endif
+
+/* If standard C identifiers with external linkage (e.g., localtime)
+   are reserved and are not already being renamed anyway, rename them
+   as if compiling with '-Dtime_tz=time_t'.  */
+#if !defined time_tz && RESERVE_STD_EXT_IDS && USE_LTZ
+# define time_tz time_t
+#endif
+
+/*
+** Compile with -Dtime_tz=T to build the tz package with a private
+** time_t type equivalent to T rather than the system-supplied time_t.
+** This debugging feature can test unusual design decisions
+** (e.g., time_t wider than 'long', or unsigned time_t) even on
+** typical platforms.
+*/
+#if defined time_tz || EPOCH_LOCAL || EPOCH_OFFSET != 0
+# define TZ_TIME_T 1
+#else
+# define TZ_TIME_T 0
+#endif
+
+#if defined LOCALTIME_IMPLEMENTATION && TZ_TIME_T
+static time_t sys_time(time_t *x) { return time(x); }
+#endif
+
+#if TZ_TIME_T
+
+typedef time_tz tz_time_t;
+
+# undef  asctime
+# define asctime tz_asctime
+# undef  asctime_r
+# define asctime_r tz_asctime_r
+# undef  ctime
+# define ctime tz_ctime
+# undef  ctime_r
+# define ctime_r tz_ctime_r
+# undef  difftime
+# define difftime tz_difftime
+# undef  gmtime
+# define gmtime tz_gmtime
+# undef  gmtime_r
+# define gmtime_r tz_gmtime_r
+# undef  localtime
+# define localtime tz_localtime
+# undef  localtime_r
+# define localtime_r tz_localtime_r
+# undef  localtime_rz
+# define localtime_rz tz_localtime_rz
+# undef  mktime
+# define mktime tz_mktime
+# undef  mktime_z
+# define mktime_z tz_mktime_z
+# undef  offtime
+# define offtime tz_offtime
+# undef  posix2time
+# define posix2time tz_posix2time
+# undef  posix2time_z
+# define posix2time_z tz_posix2time_z
+# undef  strftime
+# define strftime tz_strftime
+# undef  time
+# define time tz_time
+# undef  time2posix
+# define time2posix tz_time2posix
+# undef  time2posix_z
+# define time2posix_z tz_time2posix_z
+# undef  time_t
+# define time_t tz_time_t
+# undef  timegm
+# define timegm tz_timegm
+# undef  timelocal
+# define timelocal tz_timelocal
+# undef  timeoff
+# define timeoff tz_timeoff
+# undef  tzalloc
+# define tzalloc tz_tzalloc
+# undef  tzfree
+# define tzfree tz_tzfree
+# undef  tzset
+# define tzset tz_tzset
+# if HAVE_STRFTIME_L
+#  undef  strftime_l
+#  define strftime_l tz_strftime_l
+# endif
+# if HAVE_TZNAME
+#  undef  tzname
+#  define tzname tz_tzname
+# endif
+# if USG_COMPAT
+#  undef  daylight
+#  define daylight tz_daylight
+#  undef  timezone
+#  define timezone tz_timezone
+# endif
+# if ALTZONE
+#  undef  altzone
+#  define altzone tz_altzone
+# endif
+
+# if __STDC_VERSION__ < 202311
+#  define DEPRECATED_IN_C23 /* empty */
+# else
+#  define DEPRECATED_IN_C23 ATTRIBUTE_DEPRECATED
+# endif
+DEPRECATED_IN_C23 char *asctime(struct tm const *);
+char *asctime_r(struct tm const *restrict, char *restrict);
+DEPRECATED_IN_C23 char *ctime(time_t const *);
+char *ctime_r(time_t const *, char *);
+ATTRIBUTE_UNSEQUENCED double difftime(time_t, time_t);
+size_t strftime(char *restrict, size_t, char const *restrict,
+		struct tm const *restrict);
+# if HAVE_STRFTIME_L
+size_t strftime_l(char *restrict, size_t, char const *restrict,
+		  struct tm const *restrict, locale_t);
+# endif
+struct tm *gmtime(time_t const *);
+struct tm *gmtime_r(time_t const *restrict, struct tm *restrict);
+struct tm *localtime(time_t const *);
+struct tm *localtime_r(time_t const *restrict, struct tm *restrict);
+time_t mktime(struct tm *);
+time_t time(time_t *);
+time_t timegm(struct tm *);
+void tzset(void);
+#endif
+
+#ifndef HAVE_DECL_TIMEGM
+# if (202311 <= __STDC_VERSION__ \
+      || defined __GLIBC__ || defined __tm_zone /* musl */ \
+      || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ \
+      || (defined __APPLE__ && defined __MACH__))
+#  define HAVE_DECL_TIMEGM true
+# else
+#  define HAVE_DECL_TIMEGM false
+# endif
+#endif
+#if !HAVE_DECL_TIMEGM && !defined timegm
+time_t timegm(struct tm *);
+#endif
+
+#if !HAVE_DECL_ASCTIME_R && !defined asctime_r
+extern char *asctime_r(struct tm const *restrict, char *restrict);
+#endif
+
+#ifndef HAVE_DECL_ENVIRON
+# if defined environ || defined __USE_GNU
+#  define HAVE_DECL_ENVIRON 1
+# else
+#  define HAVE_DECL_ENVIRON 0
+# endif
+#endif
+
+#if !HAVE_DECL_ENVIRON
+extern char **environ;
+#endif
+
+#if 2 <= HAVE_TZNAME + (TZ_TIME_T || !HAVE_POSIX_DECLS)
+extern char *tzname[];
+#endif
+#if 2 <= USG_COMPAT + (TZ_TIME_T || !HAVE_POSIX_DECLS)
+extern long timezone;
+extern int daylight;
+#endif
+#if 2 <= ALTZONE + (TZ_TIME_T || !HAVE_POSIX_DECLS)
+extern long altzone;
+#endif
+
+/*
+** The STD_INSPIRED functions are similar, but most also need
+** declarations if time_tz is defined.
+*/
+
+#ifndef STD_INSPIRED
+# define STD_INSPIRED 0
+#endif
+#if STD_INSPIRED
+# if TZ_TIME_T || !defined offtime
+struct tm *offtime(time_t const *, long);
+# endif
+# if TZ_TIME_T || !defined timelocal
+time_t timelocal(struct tm *);
+# endif
+# if TZ_TIME_T || !defined timeoff
+time_t timeoff(struct tm *, long);
+# endif
+# if TZ_TIME_T || !defined time2posix
+time_t time2posix(time_t);
+# endif
+# if TZ_TIME_T || !defined posix2time
+time_t posix2time(time_t);
+# endif
+#endif
+
+/* Infer TM_ZONE on systems where this information is known, but suppress
+   guessing if NO_TM_ZONE is defined.  Similarly for TM_GMTOFF.  */
+#if (defined __GLIBC__ \
+     || defined __tm_zone /* musl */ \
+     || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ \
+     || (defined __APPLE__ && defined __MACH__))
+# if !defined TM_GMTOFF && !defined NO_TM_GMTOFF
+#  define TM_GMTOFF tm_gmtoff
+# endif
+# if !defined TM_ZONE && !defined NO_TM_ZONE
+#  define TM_ZONE tm_zone
+# endif
+#endif
+
+/*
+** Define functions that are ABI compatible with NetBSD but have
+** better prototypes.  NetBSD 6.1.4 defines a pointer type timezone_t
+** and labors under the misconception that 'const timezone_t' is a
+** pointer to a constant.  This use of 'const' is ineffective, so it
+** is not done here.  What we call 'struct state' NetBSD calls
+** 'struct __state', but this is a private name so it doesn't matter.
+*/
+#if NETBSD_INSPIRED
+typedef struct state *timezone_t;
+struct tm *localtime_rz(timezone_t restrict, time_t const *restrict,
+			struct tm *restrict);
+time_t mktime_z(timezone_t restrict, struct tm *restrict);
+timezone_t tzalloc(char const *);
+void tzfree(timezone_t);
+# if STD_INSPIRED
+#  if TZ_TIME_T || !defined posix2time_z
+ATTRIBUTE_REPRODUCIBLE time_t posix2time_z(timezone_t, time_t);
+#  endif
+#  if TZ_TIME_T || !defined time2posix_z
+ATTRIBUTE_REPRODUCIBLE time_t time2posix_z(timezone_t, time_t);
+#  endif
+# endif
+#endif
+
+/*
+** Finally, some convenience items.
+*/
+
+#define TYPE_BIT(type)	(sizeof(type) * CHAR_BIT)
+#define TYPE_SIGNED(type) (((type) -1) < 0)
+#define TWOS_COMPLEMENT(t) ((t) ~ (t) 0 < 0)
+
+/* Minimum and maximum of two values.  Use lower case to avoid
+   naming clashes with standard include files.  */
+#define max(a, b) ((a) > (b) ? (a) : (b))
+#define min(a, b) ((a) < (b) ? (a) : (b))
+
+/* Max and min values of the integer type T, of which only the bottom
+   B bits are used, and where the highest-order used bit is considered
+   to be a sign bit if T is signed.  */
+#define MAXVAL(t, b)						\
+  ((t) (((t) 1 << ((b) - 1 - TYPE_SIGNED(t)))			\
+	- 1 + ((t) 1 << ((b) - 1 - TYPE_SIGNED(t)))))
+#define MINVAL(t, b)						\
+  ((t) (TYPE_SIGNED(t) ? - TWOS_COMPLEMENT(t) - MAXVAL(t, b) : 0))
+
+/* The extreme time values, assuming no padding.  */
+#define TIME_T_MIN_NO_PADDING MINVAL(time_t, TYPE_BIT(time_t))
+#define TIME_T_MAX_NO_PADDING MAXVAL(time_t, TYPE_BIT(time_t))
+
+/* The extreme time values.  These are macros, not constants, so that
+   any portability problems occur only when compiling .c files that use
+   the macros, which is safer for applications that need only zdump and zic.
+   This implementation assumes no padding if time_t is signed and
+   either the compiler lacks support for _Generic or time_t is not one
+   of the standard signed integer types.  */
+#if HAVE__GENERIC
+# define TIME_T_MIN \
+    _Generic((time_t) 0, \
+	     signed char: SCHAR_MIN, short: SHRT_MIN, \
+	     int: INT_MIN, long: LONG_MIN, long long: LLONG_MIN, \
+	     default: TIME_T_MIN_NO_PADDING)
+# define TIME_T_MAX \
+    (TYPE_SIGNED(time_t) \
+     ? _Generic((time_t) 0, \
+		signed char: SCHAR_MAX, short: SHRT_MAX, \
+		int: INT_MAX, long: LONG_MAX, long long: LLONG_MAX, \
+		default: TIME_T_MAX_NO_PADDING)			    \
+     : (time_t) -1)
+#else
+# define TIME_T_MIN TIME_T_MIN_NO_PADDING
+# define TIME_T_MAX TIME_T_MAX_NO_PADDING
+#endif
+
+/*
+** 302 / 1000 is log10(2.0) rounded up.
+** Subtract one for the sign bit if the type is signed;
+** add one for integer division truncation;
+** add one more for a minus sign if the type is signed.
+*/
+#define INT_STRLEN_MAXIMUM(type) \
+	((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \
+	1 + TYPE_SIGNED(type))
+
+/*
+** INITIALIZE(x)
+*/
+
+#ifdef GCC_LINT
+# define INITIALIZE(x)	((x) = 0)
+#else
+# define INITIALIZE(x)
+#endif
+
+/* Whether memory access must strictly follow the C standard.
+   If 0, it's OK to read uninitialized storage so long as the value is
+   not relied upon.  Defining it to 0 lets mktime access parts of
+   struct tm that might be uninitialized, as a heuristic when the
+   standard doesn't say what to return and when tm_gmtoff can help
+   mktime likely infer a better value.  */
+#ifndef UNINIT_TRAP
+# define UNINIT_TRAP 0
+#endif
+
+#ifdef DEBUG
+# undef unreachable
+# define unreachable() abort()
+#elif !defined unreachable
+# ifdef __has_builtin
+#  if __has_builtin(__builtin_unreachable)
+#   define unreachable() __builtin_unreachable()
+#  endif
+# elif 4 < __GNUC__ + (5 <= __GNUC_MINOR__)
+#  define unreachable() __builtin_unreachable()
+# endif
+# ifndef unreachable
+#  define unreachable() ((void) 0)
+# endif
+#endif
+
+/*
+** For the benefit of GNU folk...
+** '_(MSGID)' uses the current locale's message library string for MSGID.
+** The default is to use gettext if available, and use MSGID otherwise.
+*/
+
+#if HAVE_GETTEXT
+#define _(msgid) gettext(msgid)
+#else /* !HAVE_GETTEXT */
+#define _(msgid) msgid
+#endif /* !HAVE_GETTEXT */
+
+#if !defined TZ_DOMAIN && defined HAVE_GETTEXT
+# define TZ_DOMAIN "tz"
+#endif
+
+#if HAVE_INCOMPATIBLE_CTIME_R
+#undef asctime_r
+#undef ctime_r
+char *asctime_r(struct tm const *, char *);
+char *ctime_r(time_t const *, char *);
+#endif /* HAVE_INCOMPATIBLE_CTIME_R */
+
+/* Handy macros that are independent of tzfile implementation.  */
+
+enum {
+  SECSPERMIN = 60,
+  MINSPERHOUR = 60,
+  SECSPERHOUR = SECSPERMIN * MINSPERHOUR,
+  HOURSPERDAY = 24,
+  DAYSPERWEEK = 7,
+  DAYSPERNYEAR = 365,
+  DAYSPERLYEAR = DAYSPERNYEAR + 1,
+  MONSPERYEAR = 12,
+  YEARSPERREPEAT = 400	/* years before a Gregorian repeat */
+};
+
+#define SECSPERDAY	((int_fast32_t) SECSPERHOUR * HOURSPERDAY)
+
+#define DAYSPERREPEAT		((int_fast32_t) 400 * 365 + 100 - 4 + 1)
+#define SECSPERREPEAT		((int_fast64_t) DAYSPERREPEAT * SECSPERDAY)
+#define AVGSECSPERYEAR		(SECSPERREPEAT / YEARSPERREPEAT)
+
+enum {
+  TM_SUNDAY,
+  TM_MONDAY,
+  TM_TUESDAY,
+  TM_WEDNESDAY,
+  TM_THURSDAY,
+  TM_FRIDAY,
+  TM_SATURDAY
+};
+
+enum {
+  TM_JANUARY,
+  TM_FEBRUARY,
+  TM_MARCH,
+  TM_APRIL,
+  TM_MAY,
+  TM_JUNE,
+  TM_JULY,
+  TM_AUGUST,
+  TM_SEPTEMBER,
+  TM_OCTOBER,
+  TM_NOVEMBER,
+  TM_DECEMBER
+};
+
+enum {
+  TM_YEAR_BASE = 1900,
+  TM_WDAY_BASE = TM_MONDAY,
+  EPOCH_YEAR = 1970,
+  EPOCH_WDAY = TM_THURSDAY
+};
+
+#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
+
+/*
+** Since everything in isleap is modulo 400 (or a factor of 400), we know that
+**	isleap(y) == isleap(y % 400)
+** and so
+**	isleap(a + b) == isleap((a + b) % 400)
+** or
+**	isleap(a + b) == isleap(a % 400 + b % 400)
+** This is true even if % means modulo rather than Fortran remainder
+** (which is allowed by C89 but not by C99 or later).
+** We use this to avoid addition overflow problems.
+*/
+
+#define isleap_sum(a, b)	isleap((a) % 400 + (b) % 400)
+
+#endif /* !defined PRIVATE_H */
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/southamerica
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/southamerica
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/strftime.c
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/strftime.c
@@ -0,0 +1,657 @@
+/* Convert a broken-down timestamp to a string.  */
+
+/* Copyright 1989 The Regents of the University of California.
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+   1. Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+   2. Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+   3. Neither the name of the University nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND
+   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+   ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+   OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+   SUCH DAMAGE.  */
+
+/*
+** Based on the UCB version with the copyright notice appearing above.
+**
+** This is ANSIish only when "multibyte character == plain character".
+*/
+
+#include "private.h"
+
+#include <fcntl.h>
+#include <locale.h>
+#include <stdio.h>
+
+#ifndef DEPRECATE_TWO_DIGIT_YEARS
+# define DEPRECATE_TWO_DIGIT_YEARS false
+#endif
+
+struct lc_time_T {
+	const char *	mon[MONSPERYEAR];
+	const char *	month[MONSPERYEAR];
+	const char *	wday[DAYSPERWEEK];
+	const char *	weekday[DAYSPERWEEK];
+	const char *	X_fmt;
+	const char *	x_fmt;
+	const char *	c_fmt;
+	const char *	am;
+	const char *	pm;
+	const char *	date_fmt;
+};
+
+static const struct lc_time_T	C_time_locale = {
+	{
+		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+	}, {
+		"January", "February", "March", "April", "May", "June",
+		"July", "August", "September", "October", "November", "December"
+	}, {
+		"Sun", "Mon", "Tue", "Wed",
+		"Thu", "Fri", "Sat"
+	}, {
+		"Sunday", "Monday", "Tuesday", "Wednesday",
+		"Thursday", "Friday", "Saturday"
+	},
+
+	/* X_fmt */
+	"%H:%M:%S",
+
+	/*
+	** x_fmt
+	** C99 and later require this format.
+	** Using just numbers (as here) makes Quakers happier;
+	** it's also compatible with SVR4.
+	*/
+	"%m/%d/%y",
+
+	/*
+	** c_fmt
+	** C99 and later require this format.
+	** Previously this code used "%D %X", but we now conform to C99.
+	** Note that
+	**	"%a %b %d %H:%M:%S %Y"
+	** is used by Solaris 2.3.
+	*/
+	"%a %b %e %T %Y",
+
+	/* am */
+	"AM",
+
+	/* pm */
+	"PM",
+
+	/* date_fmt */
+	"%a %b %e %H:%M:%S %Z %Y"
+};
+
+enum warn { IN_NONE, IN_SOME, IN_THIS, IN_ALL };
+
+static char *	_add(const char *, char *, const char *);
+static char *	_conv(int, const char *, char *, const char *);
+static char *	_fmt(const char *, const struct tm *, char *, const char *,
+		     enum warn *);
+static char *	_yconv(int, int, bool, bool, char *, char const *);
+
+#ifndef YEAR_2000_NAME
+# define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS"
+#endif /* !defined YEAR_2000_NAME */
+
+#if HAVE_STRFTIME_L
+size_t
+strftime_l(char *s, size_t maxsize, char const *format, struct tm const *t,
+	   ATTRIBUTE_MAYBE_UNUSED locale_t locale)
+{
+  /* Just call strftime, as only the C locale is supported.  */
+  return strftime(s, maxsize, format, t);
+}
+#endif
+
+size_t
+strftime(char *s, size_t maxsize, const char *format, const struct tm *t)
+{
+	char *	p;
+	int saved_errno = errno;
+	enum warn warn = IN_NONE;
+
+	tzset();
+	p = _fmt(format, t, s, s + maxsize, &warn);
+	if (!p) {
+	  errno = EOVERFLOW;
+	  return 0;
+	}
+	if (DEPRECATE_TWO_DIGIT_YEARS
+	    && warn != IN_NONE && getenv(YEAR_2000_NAME)) {
+		fprintf(stderr, "\n");
+		fprintf(stderr, "strftime format \"%s\" ", format);
+		fprintf(stderr, "yields only two digits of years in ");
+		if (warn == IN_SOME)
+			fprintf(stderr, "some locales");
+		else if (warn == IN_THIS)
+			fprintf(stderr, "the current locale");
+		else	fprintf(stderr, "all locales");
+		fprintf(stderr, "\n");
+	}
+	if (p == s + maxsize) {
+		errno = ERANGE;
+		return 0;
+	}
+	*p = '\0';
+	errno = saved_errno;
+	return p - s;
+}
+
+static char *
+_fmt(const char *format, const struct tm *t, char *pt,
+     const char *ptlim, enum warn *warnp)
+{
+	struct lc_time_T const *Locale = &C_time_locale;
+
+	for ( ; *format; ++format) {
+		if (*format == '%') {
+label:
+			switch (*++format) {
+			case '\0':
+				--format;
+				break;
+			case 'A':
+				pt = _add((t->tm_wday < 0 ||
+					t->tm_wday >= DAYSPERWEEK) ?
+					"?" : Locale->weekday[t->tm_wday],
+					pt, ptlim);
+				continue;
+			case 'a':
+				pt = _add((t->tm_wday < 0 ||
+					t->tm_wday >= DAYSPERWEEK) ?
+					"?" : Locale->wday[t->tm_wday],
+					pt, ptlim);
+				continue;
+			case 'B':
+				pt = _add((t->tm_mon < 0 ||
+					t->tm_mon >= MONSPERYEAR) ?
+					"?" : Locale->month[t->tm_mon],
+					pt, ptlim);
+				continue;
+			case 'b':
+			case 'h':
+				pt = _add((t->tm_mon < 0 ||
+					t->tm_mon >= MONSPERYEAR) ?
+					"?" : Locale->mon[t->tm_mon],
+					pt, ptlim);
+				continue;
+			case 'C':
+				/*
+				** %C used to do a...
+				**	_fmt("%a %b %e %X %Y", t);
+				** ...whereas now POSIX 1003.2 calls for
+				** something completely different.
+				** (ado, 1993-05-24)
+				*/
+				pt = _yconv(t->tm_year, TM_YEAR_BASE,
+					    true, false, pt, ptlim);
+				continue;
+			case 'c':
+				{
+				enum warn warn2 = IN_SOME;
+
+				pt = _fmt(Locale->c_fmt, t, pt, ptlim, &warn2);
+				if (warn2 == IN_ALL)
+					warn2 = IN_THIS;
+				if (warn2 > *warnp)
+					*warnp = warn2;
+				}
+				continue;
+			case 'D':
+				pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp);
+				continue;
+			case 'd':
+				pt = _conv(t->tm_mday, "%02d", pt, ptlim);
+				continue;
+			case 'E':
+			case 'O':
+				/*
+				** Locale modifiers of C99 and later.
+				** The sequences
+				**	%Ec %EC %Ex %EX %Ey %EY
+				**	%Od %oe %OH %OI %Om %OM
+				**	%OS %Ou %OU %OV %Ow %OW %Oy
+				** are supposed to provide alternative
+				** representations.
+				*/
+				goto label;
+			case 'e':
+				pt = _conv(t->tm_mday, "%2d", pt, ptlim);
+				continue;
+			case 'F':
+				pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp);
+				continue;
+			case 'H':
+				pt = _conv(t->tm_hour, "%02d", pt, ptlim);
+				continue;
+			case 'I':
+				pt = _conv((t->tm_hour % 12) ?
+					(t->tm_hour % 12) : 12,
+					"%02d", pt, ptlim);
+				continue;
+			case 'j':
+				pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim);
+				continue;
+			case 'k':
+				/*
+				** This used to be...
+				**	_conv(t->tm_hour % 12 ?
+				**		t->tm_hour % 12 : 12, 2, ' ');
+				** ...and has been changed to the below to
+				** match SunOS 4.1.1 and Arnold Robbins'
+				** strftime version 3.0. That is, "%k" and
+				** "%l" have been swapped.
+				** (ado, 1993-05-24)
+				*/
+				pt = _conv(t->tm_hour, "%2d", pt, ptlim);
+				continue;
+#ifdef KITCHEN_SINK
+			case 'K':
+				/*
+				** After all this time, still unclaimed!
+				*/
+				pt = _add("kitchen sink", pt, ptlim);
+				continue;
+#endif /* defined KITCHEN_SINK */
+			case 'l':
+				/*
+				** This used to be...
+				**	_conv(t->tm_hour, 2, ' ');
+				** ...and has been changed to the below to
+				** match SunOS 4.1.1 and Arnold Robbin's
+				** strftime version 3.0. That is, "%k" and
+				** "%l" have been swapped.
+				** (ado, 1993-05-24)
+				*/
+				pt = _conv((t->tm_hour % 12) ?
+					(t->tm_hour % 12) : 12,
+					"%2d", pt, ptlim);
+				continue;
+			case 'M':
+				pt = _conv(t->tm_min, "%02d", pt, ptlim);
+				continue;
+			case 'm':
+				pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim);
+				continue;
+			case 'n':
+				pt = _add("\n", pt, ptlim);
+				continue;
+			case 'p':
+				pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
+					Locale->pm :
+					Locale->am,
+					pt, ptlim);
+				continue;
+			case 'R':
+				pt = _fmt("%H:%M", t, pt, ptlim, warnp);
+				continue;
+			case 'r':
+				pt = _fmt("%I:%M:%S %p", t, pt, ptlim, warnp);
+				continue;
+			case 'S':
+				pt = _conv(t->tm_sec, "%02d", pt, ptlim);
+				continue;
+			case 's':
+				{
+					struct tm	tm;
+					char		buf[INT_STRLEN_MAXIMUM(
+								time_t) + 1];
+					time_t		mkt;
+
+					tm.tm_sec = t->tm_sec;
+					tm.tm_min = t->tm_min;
+					tm.tm_hour = t->tm_hour;
+					tm.tm_mday = t->tm_mday;
+					tm.tm_mon = t->tm_mon;
+					tm.tm_year = t->tm_year;
+					tm.tm_isdst = t->tm_isdst;
+#if defined TM_GMTOFF && ! UNINIT_TRAP
+					tm.TM_GMTOFF = t->TM_GMTOFF;
+#endif
+					mkt = mktime(&tm);
+					/* If mktime fails, %s expands to the
+					   value of (time_t) -1 as a failure
+					   marker; this is better in practice
+					   than strftime failing.  */
+					if (TYPE_SIGNED(time_t)) {
+					  intmax_t n = mkt;
+					  sprintf(buf, "%"PRIdMAX, n);
+					} else {
+					  uintmax_t n = mkt;
+					  sprintf(buf, "%"PRIuMAX, n);
+					}
+					pt = _add(buf, pt, ptlim);
+				}
+				continue;
+			case 'T':
+				pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp);
+				continue;
+			case 't':
+				pt = _add("\t", pt, ptlim);
+				continue;
+			case 'U':
+				pt = _conv((t->tm_yday + DAYSPERWEEK -
+					t->tm_wday) / DAYSPERWEEK,
+					"%02d", pt, ptlim);
+				continue;
+			case 'u':
+				/*
+				** From Arnold Robbins' strftime version 3.0:
+				** "ISO 8601: Weekday as a decimal number
+				** [1 (Monday) - 7]"
+				** (ado, 1993-05-24)
+				*/
+				pt = _conv((t->tm_wday == 0) ?
+					DAYSPERWEEK : t->tm_wday,
+					"%d", pt, ptlim);
+				continue;
+			case 'V':	/* ISO 8601 week number */
+			case 'G':	/* ISO 8601 year (four digits) */
+			case 'g':	/* ISO 8601 year (two digits) */
+/*
+** From Arnold Robbins' strftime version 3.0: "the week number of the
+** year (the first Monday as the first day of week 1) as a decimal number
+** (01-53)."
+** (ado, 1993-05-24)
+**
+** From <https://www.cl.cam.ac.uk/~mgk25/iso-time.html> by Markus Kuhn:
+** "Week 01 of a year is per definition the first week which has the
+** Thursday in this year, which is equivalent to the week which contains
+** the fourth day of January. In other words, the first week of a new year
+** is the week which has the majority of its days in the new year. Week 01
+** might also contain days from the previous year and the week before week
+** 01 of a year is the last week (52 or 53) of the previous year even if
+** it contains days from the new year. A week starts with Monday (day 1)
+** and ends with Sunday (day 7). For example, the first week of the year
+** 1997 lasts from 1996-12-30 to 1997-01-05..."
+** (ado, 1996-01-02)
+*/
+				{
+					int	year;
+					int	base;
+					int	yday;
+					int	wday;
+					int	w;
+
+					year = t->tm_year;
+					base = TM_YEAR_BASE;
+					yday = t->tm_yday;
+					wday = t->tm_wday;
+					for ( ; ; ) {
+						int	len;
+						int	bot;
+						int	top;
+
+						len = isleap_sum(year, base) ?
+							DAYSPERLYEAR :
+							DAYSPERNYEAR;
+						/*
+						** What yday (-3 ... 3) does
+						** the ISO year begin on?
+						*/
+						bot = ((yday + 11 - wday) %
+							DAYSPERWEEK) - 3;
+						/*
+						** What yday does the NEXT
+						** ISO year begin on?
+						*/
+						top = bot -
+							(len % DAYSPERWEEK);
+						if (top < -3)
+							top += DAYSPERWEEK;
+						top += len;
+						if (yday >= top) {
+							++base;
+							w = 1;
+							break;
+						}
+						if (yday >= bot) {
+							w = 1 + ((yday - bot) /
+								DAYSPERWEEK);
+							break;
+						}
+						--base;
+						yday += isleap_sum(year, base) ?
+							DAYSPERLYEAR :
+							DAYSPERNYEAR;
+					}
+#ifdef XPG4_1994_04_09
+					if ((w == 52 &&
+						t->tm_mon == TM_JANUARY) ||
+						(w == 1 &&
+						t->tm_mon == TM_DECEMBER))
+							w = 53;
+#endif /* defined XPG4_1994_04_09 */
+					if (*format == 'V')
+						pt = _conv(w, "%02d",
+							pt, ptlim);
+					else if (*format == 'g') {
+						*warnp = IN_ALL;
+						pt = _yconv(year, base,
+							false, true,
+							pt, ptlim);
+					} else	pt = _yconv(year, base,
+							true, true,
+							pt, ptlim);
+				}
+				continue;
+			case 'v':
+				/*
+				** From Arnold Robbins' strftime version 3.0:
+				** "date as dd-bbb-YYYY"
+				** (ado, 1993-05-24)
+				*/
+				pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp);
+				continue;
+			case 'W':
+				pt = _conv((t->tm_yday + DAYSPERWEEK -
+					(t->tm_wday ?
+					(t->tm_wday - 1) :
+					(DAYSPERWEEK - 1))) / DAYSPERWEEK,
+					"%02d", pt, ptlim);
+				continue;
+			case 'w':
+				pt = _conv(t->tm_wday, "%d", pt, ptlim);
+				continue;
+			case 'X':
+				pt = _fmt(Locale->X_fmt, t, pt, ptlim, warnp);
+				continue;
+			case 'x':
+				{
+				enum warn warn2 = IN_SOME;
+
+				pt = _fmt(Locale->x_fmt, t, pt, ptlim, &warn2);
+				if (warn2 == IN_ALL)
+					warn2 = IN_THIS;
+				if (warn2 > *warnp)
+					*warnp = warn2;
+				}
+				continue;
+			case 'y':
+				*warnp = IN_ALL;
+				pt = _yconv(t->tm_year, TM_YEAR_BASE,
+					false, true,
+					pt, ptlim);
+				continue;
+			case 'Y':
+				pt = _yconv(t->tm_year, TM_YEAR_BASE,
+					true, true,
+					pt, ptlim);
+				continue;
+			case 'Z':
+#ifdef TM_ZONE
+				pt = _add(t->TM_ZONE, pt, ptlim);
+#elif HAVE_TZNAME
+				if (t->tm_isdst >= 0)
+					pt = _add(tzname[t->tm_isdst != 0],
+						pt, ptlim);
+#endif
+				/*
+				** C99 and later say that %Z must be
+				** replaced by the empty string if the
+				** time zone abbreviation is not
+				** determinable.
+				*/
+				continue;
+			case 'z':
+#if defined TM_GMTOFF || USG_COMPAT || ALTZONE
+				{
+				long		diff;
+				char const *	sign;
+				bool negative;
+
+# ifdef TM_GMTOFF
+				diff = t->TM_GMTOFF;
+# else
+				/*
+				** C99 and later say that the UT offset must
+				** be computed by looking only at
+				** tm_isdst. This requirement is
+				** incorrect, since it means the code
+				** must rely on magic (in this case
+				** altzone and timezone), and the
+				** magic might not have the correct
+				** offset. Doing things correctly is
+				** tricky and requires disobeying the standard;
+				** see GNU C strftime for details.
+				** For now, punt and conform to the
+				** standard, even though it's incorrect.
+				**
+				** C99 and later say that %z must be replaced by
+				** the empty string if the time zone is not
+				** determinable, so output nothing if the
+				** appropriate variables are not available.
+				*/
+				if (t->tm_isdst < 0)
+					continue;
+				if (t->tm_isdst == 0)
+#  if USG_COMPAT
+					diff = -timezone;
+#  else
+					continue;
+#  endif
+				else
+#  if ALTZONE
+					diff = -altzone;
+#  else
+					continue;
+#  endif
+# endif
+				negative = diff < 0;
+				if (diff == 0) {
+# ifdef TM_ZONE
+				  negative = t->TM_ZONE[0] == '-';
+# else
+				  negative = t->tm_isdst < 0;
+#  if HAVE_TZNAME
+				  if (tzname[t->tm_isdst != 0][0] == '-')
+				    negative = true;
+#  endif
+# endif
+				}
+				if (negative) {
+					sign = "-";
+					diff = -diff;
+				} else	sign = "+";
+				pt = _add(sign, pt, ptlim);
+				diff /= SECSPERMIN;
+				diff = (diff / MINSPERHOUR) * 100 +
+					(diff % MINSPERHOUR);
+				pt = _conv(diff, "%04d", pt, ptlim);
+				}
+#endif
+				continue;
+			case '+':
+				pt = _fmt(Locale->date_fmt, t, pt, ptlim,
+					warnp);
+				continue;
+			case '%':
+			/*
+			** X311J/88-090 (4.12.3.5): if conversion char is
+			** undefined, behavior is undefined. Print out the
+			** character itself as printf(3) also does.
+			*/
+			default:
+				break;
+			}
+		}
+		if (pt == ptlim)
+			break;
+		*pt++ = *format;
+	}
+	return pt;
+}
+
+static char *
+_conv(int n, const char *format, char *pt, const char *ptlim)
+{
+	char	buf[INT_STRLEN_MAXIMUM(int) + 1];
+
+	sprintf(buf, format, n);
+	return _add(buf, pt, ptlim);
+}
+
+static char *
+_add(const char *str, char *pt, const char *ptlim)
+{
+	while (pt < ptlim && (*pt = *str++) != '\0')
+		++pt;
+	return pt;
+}
+
+/*
+** POSIX and the C Standard are unclear or inconsistent about
+** what %C and %y do if the year is negative or exceeds 9999.
+** Use the convention that %C concatenated with %y yields the
+** same output as %Y, and that %Y contains at least 4 bytes,
+** with more only if necessary.
+*/
+
+static char *
+_yconv(int a, int b, bool convert_top, bool convert_yy,
+       char *pt, const char *ptlim)
+{
+	register int	lead;
+	register int	trail;
+
+	int DIVISOR = 100;
+	trail = a % DIVISOR + b % DIVISOR;
+	lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
+	trail %= DIVISOR;
+	if (trail < 0 && lead > 0) {
+		trail += DIVISOR;
+		--lead;
+	} else if (lead < 0 && trail > 0) {
+		trail -= DIVISOR;
+		++lead;
+	}
+	if (convert_top) {
+		if (lead == 0 && trail < 0)
+			pt = _add("-0", pt, ptlim);
+		else	pt = _conv(lead, "%02d", pt, ptlim);
+	}
+	if (convert_yy)
+		pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim);
+	return pt;
+}
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/theory.html
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/theory.html
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/time2posix.3
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/time2posix.3
@@ -0,0 +1,133 @@
+.\" This file is in the public domain, so clarified as of
+.\" 1996-06-05 by Arthur David Olson.
+.TH time2posix 3
+.SH NAME
+time2posix, posix2time \- convert seconds since the Epoch
+.SH SYNOPSIS
+.nf
+.ie \n(.g .ds - \f(CR-\fP
+.el .ds - \-
+.B #include <time.h>
+.PP
+.B time_t time2posix(time_t t);
+.PP
+.B time_t posix2time(time_t t);
+.PP
+.B cc ... \*-ltz
+.fi
+.SH DESCRIPTION
+.ie '\(en'' .ds en \-
+.el .ds en \(en
+.ie '\(lq'' .ds lq \&"\"
+.el .ds lq \(lq\"
+.ie '\(rq'' .ds rq \&"\"
+.el .ds rq \(rq\"
+.de q
+\\$3\*(lq\\$1\*(rq\\$2
+..
+IEEE Standard 1003.1
+(POSIX)
+requires the time_t value 536457599 to stand for 1986-12-31 23:59:59 UTC.
+This effectively implies that POSIX time_t values cannot include leap
+seconds and,
+therefore,
+that the system time must be adjusted as each leap occurs.
+.PP
+If the time package is configured with leap-second support
+enabled,
+however,
+no such adjustment is needed and
+time_t values continue to increase over leap events
+(as a true
+.q "seconds since...\&"
+value).
+This means that these values will differ from those required by POSIX
+by the net number of leap seconds inserted since the Epoch.
+.PP
+Typically this is not a problem as the type time_t is intended
+to be
+(mostly)
+opaque \*(en time_t values should only be obtained-from and
+passed-to functions such as
+.BR time(2) ,
+.BR localtime(3) ,
+.BR mktime(3) ,
+and
+.BR difftime(3) .
+However,
+POSIX gives an arithmetic
+expression for directly computing a time_t value from a given date/time,
+and the same relationship is assumed by some
+(usually older)
+applications.
+Any programs creating/dissecting time_t values
+using such a relationship will typically not handle intervals
+over leap seconds correctly.
+.PP
+The
+.B time2posix
+and
+.B posix2time
+functions are provided to address this time_t mismatch by converting
+between local time_t values and their POSIX equivalents.
+This is done by accounting for the number of time-base changes that
+would have taken place on a POSIX system as leap seconds were inserted
+or deleted.
+These converted values can then be used in lieu of correcting the older
+applications,
+or when communicating with POSIX-compliant systems.
+.PP
+The
+.B time2posix
+function
+is single-valued.
+That is,
+every local time_t
+corresponds to a single POSIX time_t.
+The
+.B posix2time
+function
+is less well-behaved:
+for a positive leap second hit the result is not unique,
+and for a negative leap second hit the corresponding
+POSIX time_t doesn't exist so an adjacent value is returned.
+Both of these are good indicators of the inferiority of the
+POSIX representation.
+.PP
+The following table summarizes the relationship between a time
+T and its conversion to,
+and back from,
+the POSIX representation over the leap second inserted at the end of June,
+1993.
+.nf
+.ta \w'93/06/30 'u +\w'23:59:59 'u +\w'A+0 'u +\w'X=time2posix(T) 'u
+DATE	TIME	T	X=time2posix(T)	posix2time(X)
+93/06/30	23:59:59	A+0	B+0	A+0
+93/06/30	23:59:60	A+1	B+1	A+1 or A+2
+93/07/01	00:00:00	A+2	B+1	A+1 or A+2
+93/07/01	00:00:01	A+3	B+2	A+3
+
+A leap second deletion would look like...
+
+DATE	TIME	T	X=time2posix(T)	posix2time(X)
+??/06/30	23:59:58	A+0	B+0	A+0
+??/07/01	00:00:00	A+1	B+2	A+1
+??/07/01	00:00:01	A+2	B+3	A+2
+.sp
+.ce
+	[Note: posix2time(B+1) => A+0 or A+1]
+.fi
+.PP
+If leap-second support is not enabled,
+local time_t and
+POSIX time_t values are equivalent,
+and both
+.B time2posix
+and
+.B posix2time
+degenerate to the identity function.
+.SH SEE ALSO
+difftime(3),
+localtime(3),
+mktime(3),
+time(2)
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tz-art.html
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tz-art.html
@@ -0,0 +1,636 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8">
+<title>Time and the Arts</title>
+</head>
+<body>
+<h1>Time and the Arts</h1>
+<h2>Documentaries</h2>
+<ul>
+<li>
+"<a href="https://www.youtube.com/watch?v=84aWtseb2-4">Daylight
+Saving Time Explained</a>" (2011; 6:39) lightly covers daylight saving
+time's theory, history, pros and cons. Among other things, it explains
+Arizona's daylight-saving enclaves quite well.</li>
+<li>
+"<a href="https://www.youtube.com/watch?v=-5wpm-gesOY">The Problem
+with Time &amp; Timezones &ndash; Computerphile</a>" (2013; 10:12) delves
+into problems that programmers have with timekeeping.</li>
+<li>
+"<a href="https://www.rferl.org/a/28375932.html">All The Time In The World:
+Explaining The Mysteries Of Time Zones</a>" (2017; 2:15)
+briefly says why France has more time zones than Russia.
+<li>
+"<a href="https://www.youtube.com/watch?v=yRz-Dl60Lfc">Why Denmark is
+.17 Seconds Behind The World</a>" (2019; 6:29) explains why Denmark and
+the United Kingdom don't exactly follow their own law about civil time.
+<li>
+"About Time" (1962; 59 minutes) is part of the
+Bell Science extravaganza, with Frank Baxter, Richard Deacon, and Les Tremayne.
+Its advisor was Richard Feynman, and it was voiced by Mel Blanc.
+(<a href="https://www.imdb.com/title/tt0154110/">IMDb entry</a>.)</li>
+</ul>
+<h2>Movies</h2>
+<ul>
+<li>
+In the 1946 movie <em>A Matter of Life and Death</em>
+(U.S. title <em>Stairway to Heaven</em>)
+there is a reference to British Double Summer Time.
+The time does not play a large part in the plot;
+it's just a passing reference to the time when one of the
+characters was supposed to have died (but didn't).
+(<a href="https://www.imdb.com/title/tt0038733/">IMDb entry.</a>)
+(Dave Cantor)
+<li>
+The 1953 railway comedy movie <em>The Titfield Thunderbolt</em> includes a
+play on words on British Double Summer Time. Valentine's wife wants
+him to leave the pub and asks him, "Do you know what time it is?"
+And he, happy where he is, replies: "Yes, my love. Summer double time."
+(<a href="https://www.imdb.com/title/tt0046436/">IMDb entry.</a>)
+(Mark Brader, 2009-10-02)
+</li>
+<li>
+The premise of the 1999 caper movie <em>Entrapment</em> involves computers
+in an international banking network being shut down briefly at
+midnight in each time zone to avoid any problems at the transition
+from the year 1999 to 2000 in that zone. (Hmmmm.) If this shutdown
+is extended by 10 seconds, it will create a one-time opportunity for
+a gigantic computerized theft. To achieve this, at one location the
+crooks interfere with the microwave system supplying time signals to
+the computer, advancing the time by 0.1 second each minute over the
+last hour of 1999. (So this movie teaches us that 0.1 &times; 60 = 10.)
+(<a href="https://www.imdb.com/title/tt0137494/">IMDb entry.</a>)
+(Mark Brader, 2009-10-02)
+</li>
+<li>
+One mustn't forget the
+<a href="https://www.youtube.com/watch?v=k4EUTMPuvHo">trailer</a>
+(2014; 2:23) for the movie <em>Daylight Saving</em>.
+</li>
+</ul>
+<h2>TV episodes</h2>
+<ul>
+<li>
+An episode of <em>The Adventures of Superman</em> entitled "The Mysterious
+Cube," first aired 1958-02-24, had Superman convincing the controllers
+of the Arlington Time Signal to broadcast ahead of actual time;
+doing so got a crook trying to be declared dead to
+emerge a bit too early from the titular enclosure.
+(<a href="https://www.imdb.com/title/tt0506628/">IMDb entry</a>.)
+</li>
+<li>
+"<a href="https://en.wikipedia.org/wiki/The_Chimes_of_Big_Ben">The Chimes
+of Big Ben</a>", <em>The Prisoner</em>, episode 2, ITC, 1967-10-06.
+Our protagonist tumbles to
+the fraudulent nature of a Poland-to-England escape upon hearing "Big
+Ben" chiming on Polish local time.
+(<a href="https://www.imdb.com/title/tt0679185/">IMDb entry.</a>)
+</li>
+<li>
+"The Susie", <em>Seinfeld</em>, season 8, episode 15, NBC, 1997-02-13.
+Kramer decides that daylight saving time
+isn't coming fast enough, so he sets his watch ahead an hour.
+</li>
+<li>
+"20 Hours in America", <em>The West Wing</em>, season 4, episodes 1&ndash;2,
+2002-09-25, contained a <a
+href="https://www.youtube.com/watch?v=-J1NHzQ1sgc">scene</a> that
+saw White House staffers stranded in Indiana; they thought they had time to
+catch Air Force One but were done in by intra-Indiana local time changes.
+</li>
+<li>
+"In what time zone would you find New York City?" was a $200 question on
+the 1999-11-13 United States airing of <em>Who Wants to Be a Millionaire?</em>,
+and "In 1883, what industry led the movement to divide the U.S. into four time
+zones?" was a $32,000 question on the 2001-05-23 United States airing of
+the same show. At this rate, the million-dollar time-zone
+question should have been asked 2002-06-04.
+</li>
+<li>
+A private jet's mid-flight change of time zones distorts Alison Dubois'
+premonition in the "We Had a Dream" episode of <em>Medium</em>
+(originally aired 2007-02-28).
+</li>
+<li>
+A criminal's failure to account for the start of daylight saving is pivotal
+in "<a href="https://monk.fandom.com/wiki/Mr._Monk_and_the_Rapper">Mr. Monk
+and the Rapper</a>" (first aired 2007-07-20).
+</li>
+<li>
+In the <em>30 Rock</em> episode "Anna Howard Shaw Day"
+(first broadcast 2010-02-11),
+Jack Donaghy's date realizes that a Geneva-to-New-York business phone call
+received in the evening must be fake given the difference in local times.
+</li>
+<li>
+In the "Run by the Monkeys" episode of <em>Da Vinci's Inquest</em>
+(first broadcast 2002-11-17),
+a witness in a five-year-old fire case realizes they may not have set
+their clock back when daylight saving ended on the day of the fire,
+introducing the possibility of an hour when arson might have occurred.
+</li>
+<li>
+In "The Todd Couple" episode of <em>Outsourced</em> (first aired 2011-02-10),
+Manmeet sets up Valentine's Day teledates for 6:00 and 9:00pm;
+since one is with a New Yorker and the other with a San Franciscan,
+hilarity ensues.
+(Never mind that this should be 7:30am in Mumbai, yet for some reason the show
+proceeds as though it's also mid-evening there.)
+</li>
+<li>
+In the "14 Days to Go"/"T Minus..." episode of
+<em>You, Me and the Apocalypse</em>
+(first aired 2015-11-11 in the UK, 2016-03-10 in the US),
+the success of a mission to deal with a comet
+hinges on whether or not Russia observes daylight saving time.
+(In the US,
+the episode first aired in the week before the switch to <abbr>DST</abbr>.)
+</li>
+<li>
+"The Lost Hour", <em>Eerie, Indiana</em>, episode 10, NBC, 1991-12-01.
+Despite Indiana's then-lack of <abbr>DST</abbr>,
+Marshall changes his clock with unusual consequences.
+See "<a
+href="https://www.avclub.com/eerie-indiana-was-a-few-dimensions-ahead-of-its-time-1819833380"><em>Eerie,
+Indiana</em> was a few dimensions ahead of its time</a>".
+</li>
+<li>
+"Time Tunnel", <em>The Adventures of Pete &amp; Pete</em>, season 2, episode 5,
+Nickelodeon, 1994-10-23.
+The two Petes travel back in time an hour
+on the day that <abbr>DST</abbr> ends.
+</li>
+<li>
+"King-Size Homer", <em>The Simpsons</em>, episode 135, Fox, 1995-11-05.
+Homer, working from home, remarks "8:58, first
+time I've ever been early for work. Except for all those daylight
+savings days. Lousy farmers."
+</li>
+<li>
+<em>Last Week Tonight with John Oliver</em>, season 2, episode 5, 2015-03-08,
+asked, "<a href="https://www.youtube.com/watch?v=br0NW9ufUUw">Daylight Saving
+Time &ndash; How Is This Still A Thing?</a>"
+</li>
+<li>
+"Tracks", <em>The Good Wife</em>, season 7, episode 12,
+CBS, 2016-01-17.
+The applicability of a contract hinges on the
+time zone associated with a video timestamp.
+</li>
+<li>
+"Justice", <em>Veep</em>, season 6, episode 4, HBO, 2017-05-07.
+Jonah's inability to understand <abbr>DST</abbr> ends up impressing a wealthy
+backer who sets him up for a 2020 presidential run.
+</li>
+</ul>
+<h2>Books, plays, and magazines</h2>
+<ul>
+<li>
+Jules Verne, <em>Around the World in Eighty Days</em>
+(<em>Le tour du monde en quatre-vingts jours</em>), 1873.
+Wall-clock time plays a central role in the plot.
+European readers of the 1870s clearly held the U.S. press in
+deep contempt; the protagonists cross the U.S. without once
+reading a paper.
+Available versions include
+<a href="https://www.gutenberg.org/ebooks/103">an English
+translation</a>, and
+<a href="https://fourmilab.ch/etexts/www/tdm80j">the original French</a>
+"with illustrations from the original 1873 French-language edition".
+</li>
+<li>
+Nick Enright, <em>Daylight Saving</em>, 1989.
+A fast-paced comedy about love and loneliness as the clocks turn back.
+</li>
+<li>
+Umberto Eco,
+<a href="https://en.wikipedia.org/wiki/The_Island_of_the_Day_Before"><em>The
+Island of the Day Before</em></a>
+(<em>L'isola del giorno prima</em>), 1994.
+"...the story of a 17th century Italian nobleman trapped near an island
+on the International Date Line.  Time and time zones play an integral
+part in the novel." (Paul Eggert, 2006-04-22)
+</li>
+<li>
+John Dunning, <a
+href="https://www.simonandschuster.com/books/Two-OClock-Eastern-Wartime/John-Dunning/9781439171530"><em>Two
+O'Clock, Eastern Wartime</em></a>, 2001.
+Mystery, history, daylight saving time, and old-time radio.
+</li>
+<li>
+Surrealist artist Guy Billout's work "Date Line" appeared on page 103
+of the 1999-11 <em>Atlantic Monthly</em>.
+</li>
+<li>
+"Gloom, Gloom, Go Away" by Walter Kirn appeared on page 106 of <em>Time</em>
+magazine's 2002-11-11 issue; among other things, it proposed
+year-round <abbr>DST</abbr> as a way of lessening wintertime despair.
+</li>
+</ul>
+<h2>Music</h2>
+<p>
+Data on recordings of "Save That Time," Russ Long, Serrob Publishing, BMI:</p>
+<table>
+<tr><td>Artist</td><td>Karrin Allyson</td></tr>
+<tr><td>CD</td><td>I Didn't Know About You</td></tr>
+<tr><td>Copyright Date</td><td>1993</td></tr>
+<tr><td>Label</td><td>Concord Jazz, Inc.</td></tr>
+<tr><td>ID</td><td>CCD-4543</td></tr>
+<tr><td>Track Time</td><td>3:44</td></tr>
+<tr><td>Personnel</td><td>Karrin Allyson, vocal;
+Russ Long, piano;
+Gerald Spaits, bass;
+Todd Strait, drums</td></tr>
+<tr><td>Notes</td><td>CD notes "additional lyric by Karrin Allyson;
+arranged by Russ Long and Karrin Allyson"</td></tr>
+<tr><td>ADO Rating</td><td>1 star</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/i-didnt-know-about-you-mw0000618657">AMG Rating</a></td><td>4 stars</td></tr>
+<tr><td>Penguin Rating</td><td>3.5 stars</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+<tr><td>Artist</td><td>Kevin Mahogany</td></tr>
+<tr><td>CD</td><td>Double Rainbow</td></tr>
+<tr><td>Copyright Date</td><td>1993</td></tr>
+<tr><td>Label</td><td>Enja Records</td></tr>
+<tr><td>ID</td><td>ENJ-7097 2</td></tr>
+<tr><td>Track Time</td><td>6:27</td></tr>
+<tr><td>Personnel</td><td>Kevin Mahogany, vocal;
+Kenny Barron, piano;
+Ray Drummond, bass;
+Ralph Moore, tenor saxophone;
+Lewis Nash, drums</td></tr>
+<tr><td>ADO Rating</td><td>1.5 stars</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/double-rainbow-mw0000620371">AMG Rating</a></td><td>3 stars</td></tr>
+<tr><td>Penguin Rating</td><td>3 stars</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+<tr><td>Artist</td><td>Joe Williams</td></tr>
+<tr><td>CD</td><td>Here's to Life</td></tr>
+<tr><td>Copyright Date</td><td>1994</td></tr>
+<tr><td>Label</td><td>Telarc International Corporation</td></tr>
+<tr><td>ID</td><td>CD-83357</td></tr>
+<tr><td>Track Time</td><td>3:58</td></tr>
+<tr><td>Personnel</td><td>Joe Williams, vocal
+The Robert Farnon [39 piece] Orchestra</td></tr>
+<tr><td>Notes</td><td>This CD is also available as part of a 3-CD package from
+Telarc, "Triple Play" (CD-83461)</td></tr>
+<tr><td>ADO Rating</td><td>black dot</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/heres-to-life-mw0000623648">AMG Rating</a></td><td>2 stars</td></tr>
+<tr><td>Penguin Rating</td><td>3 stars</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+<tr><td>Artist</td><td>Charles Fambrough</td></tr>
+<tr><td>CD</td><td>Keeper of the Spirit</td></tr>
+<tr><td>Copyright Date</td><td>1995</td></tr>
+<tr><td>Label</td><td>AudioQuest Music</td></tr>
+<tr><td>ID</td><td>AQ-CD1033</td></tr>
+<tr><td>Track Time</td><td>7:07</td></tr>
+<tr><td>Personnel</td><td>Charles Fambrough, bass;
+Joel Levine, tenor recorder;
+Edward Simon, piano;
+Lenny White, drums;
+Marion Simon, percussion</td></tr>
+<tr><td>ADO Rating</td><td>2 stars</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/keeper-of-the-spirit-mw0000176559">AMG Rating</a></td><td>unrated</td></tr>
+<tr><td>Penguin Rating</td><td>3 stars</td></tr>
+</table>
+<hr>
+<p>Also of note:</p>
+<table>
+<tr><td>Artist</td><td>Holly Cole Trio</td></tr>
+<tr><td>CD</td><td>Blame It On My Youth</td></tr>
+<tr><td>Copyright Date</td><td>1992</td></tr>
+<tr><td>Label</td><td>Manhattan</td></tr>
+<tr><td>ID</td><td>CDP 7 97349 2</td></tr>
+<tr><td>Total Time</td><td>37:45</td></tr>
+<tr><td>Personnel</td><td>Holly Cole, voice;
+Aaron Davis, piano;
+David Piltch, string bass</td></tr>
+<tr><td>Notes</td><td>Lyrical reference to "Eastern Standard Time" in
+Tom Waits' "Purple Avenue"</td></tr>
+<tr><td>ADO Rating</td><td>2.5 stars</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/blame-it-on-my-youth-mw0000274303">AMG Rating</a></td><td>3 stars</td></tr>
+<tr><td>Penguin Rating</td><td>unrated</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+<tr><td>Artist</td><td>Milt Hinton</td></tr>
+<tr><td>CD</td><td>Old Man Time</td></tr>
+<tr><td>Copyright Date</td><td>1990</td></tr>
+<tr><td>Label</td><td>Chiaroscuro</td></tr>
+<tr><td>ID</td><td>CR(D) 310</td></tr>
+<tr><td>Total Time</td><td>149:38 (two CDs)</td></tr>
+<tr><td>Personnel</td><td>Milt Hinton, bass;
+Doc Cheatham, Dizzy Gillespie, Clark Terry, trumpet;
+Al Grey, trombone;
+Eddie Barefield, Joe Camel (Flip Phillips), Buddy Tate,
+clarinet and saxophone;
+John Bunch, Red Richards, Norman Simmons, Derek Smith,
+Ralph Sutton, piano;
+Danny Barker, Al Casey, guitar;
+Gus Johnson, Gerryck King, Bob Rosengarden, Jackie Williams,
+drums;
+Lionel Hampton, vibraphone;
+Cab Calloway, Joe Williams, vocal;
+Buck Clayton, arrangements</td></tr>
+<tr><td>Notes</td><td>tunes include Old Man Time, Time After Time,
+Sometimes I'm Happy,
+A Hot Time in the Old Town Tonight,
+Four or Five Times, Now's the Time,
+Time on My Hands, This Time It's Us,
+and Good Time Charlie.
+<a href="http://www.chiaroscurojazz.com/album.php?C=310">Album info</a>
+is available.</td></tr>
+<tr><td>ADO Rating</td><td>3 stars</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/old-man-time-mw0000269353">AMG Rating</a></td><td>4.5 stars</td></tr>
+<tr><td>Penguin Rating</td><td>3 stars</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+<tr><td>Artist</td><td>Alan Broadbent</td></tr>
+<tr><td>CD</td><td>Pacific Standard Time</td></tr>
+<tr><td>Copyright Date</td><td>1995</td></tr>
+<tr><td>Label</td><td>Concord Jazz, Inc.</td></tr>
+<tr><td>ID</td><td>CCD-4664</td></tr>
+<tr><td>Total Time</td><td>62:42</td></tr>
+<tr><td>Personnel</td><td>Alan Broadbent, piano;
+Putter Smith, Bass;
+Frank Gibson, Jr., drums</td></tr>
+<tr><td>Notes</td><td>The CD cover features an analemma for equation-of-time fans</td></tr>
+<tr><td>ADO Rating</td><td>1 star</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/pacific-standard-time-mw0000645433">AMG Rating</a></td><td>4 stars</td></tr>
+<tr><td>Penguin Rating</td><td>3.5 stars</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+<tr><td>Artist</td><td>Anthony Braxton/Richard Teitelbaum</td></tr>
+<tr><td>CD</td><td>Silence/Time Zones</td></tr>
+<tr><td>Copyright Date</td><td>1996</td></tr>
+<tr><td>Label</td><td>Black Lion</td></tr>
+<tr><td>ID</td><td>BLCD 760221</td></tr>
+<tr><td>Total Time</td><td>72:58</td></tr>
+<tr><td>Personnel</td><td>Anthony Braxton, sopranino and alto saxophones,
+contrebasse clarinet, miscellaneous instruments;
+Leo Smith, trumpet and miscellaneous instruments;
+Leroy Jenkins, violin and miscellaneous instruments;
+Richard Teitelbaum, modular moog and micromoog synthesizer</td></tr>
+<tr><td>ADO Rating</td><td>black dot</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/silence-time-zones-mw0000595735">AMG Rating</a></td><td>4 stars</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+<tr><td>Artist</td><td>Charles Gayle</td></tr>
+<tr><td>CD</td><td>Time Zones</td></tr>
+<tr><td>Copyright Date</td><td>2006</td></tr>
+<tr><td>Label</td><td>Tompkins Square</td></tr>
+<tr><td>ID</td><td>TSQ2839</td></tr>
+<tr><td>Total Time</td><td>49:06</td></tr>
+<tr><td>Personnel</td><td>Charles Gayle, piano</td></tr>
+<tr><td>ADO Rating</td><td>1 star</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/time-zones-mw0000349642">AMG Rating</a></td><td>4.5 stars</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+<tr><td>Artist</td><td>The Get Up Kids</td></tr>
+<tr><td>CD</td><td>Eudora</td></tr>
+<tr><td>Copyright Date</td><td>2001</td></tr>
+<tr><td>Label</td><td>Vagrant</td></tr>
+<tr><td>ID</td><td>357</td></tr>
+<tr><td>Total Time</td><td>65:12</td></tr>
+<tr><td>Notes</td><td>Includes the song "Central Standard Time." Thanks to Colin Bowern for this information.</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/eudora-mw0000592063">AMG Rating</a></td><td>2.5 stars</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+
+<tr><td>Artist</td><td>Coldplay</td></tr>
+<tr><td>Song</td><td>Clocks</td></tr>
+<tr><td>Copyright Date</td><td>2003</td></tr>
+<tr><td>Label</td><td>Capitol Records</td></tr>
+<tr><td>ID</td><td>52608</td></tr>
+<tr><td>Total Time</td><td>4:13</td></tr>
+<tr><td>Notes</td><td>Won the 2004 Record of the Year honor at the
+Grammy Awards. Co-written and performed by Chris Martin,
+great-great-grandson of <abbr>DST</abbr> inventor William Willett.
+The song's first line is "Lights go out and I can't be saved".</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+
+<tr><td>Artist</td><td>Jaime Guevara</td></tr>
+<tr><td>Song</td><td><a
+href="https://www.youtube.com/watch?v=ZfN4Fe_A50U">Qu&eacute;
+hora es</a></td></tr>
+<tr><td>Date</td><td>1993</td></tr>
+<tr><td>Total Time</td><td>3:04</td></tr>
+<tr><td>Notes</td><td>The song protested "Sixto Hour" in Ecuador
+(1992&ndash;3). Its lyrics include "Amanec&iacute;a en mitad de la noche, los
+guaguas iban a clase sin sol" ("It was dawning in the middle of the
+night, the buses went to class without sun").
+<tr><td>&nbsp;</td><td></td></tr>
+
+<tr><td>Artist</td><td>Irving Kahal and Harry Richman</td></tr>
+<tr><td>Song</td><td>There Ought to be a Moonlight Saving Time</td></tr>
+<tr><td>Copyright Date</td><td>1931</td>
+<tr><td>Notes</td><td>This musical standard was a No. 1 hit for Guy Lombardo
+in 1931, and was also performed by Maurice Chevalier, Blossom Dearie
+and many others. The phrase "Moonlight saving time" also appears in
+the 1995 country song "Not Enough Hours in the Night" written by Aaron
+Barker, Kim Williams and Rob Harbin and performed by Doug
+Supernaw.</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+
+<tr><td>Artist</td><td>The Microscopic Septet</td></tr>
+<tr><td>CD</td><td>Lobster Leaps In</td></tr>
+<tr><td>Copyright Date</td><td>2008</td></tr>
+<tr><td>Label</td><td>Cuneiform</td></tr>
+<tr><td>ID</td><td>272</td></tr>
+<tr><td>Total Time</td><td>73:05</td></tr>
+<tr><td>Notes</td><td>Includes the song "Twilight Time Zone."</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/lobster-leaps-in-mw0000794929">AMG Rating</a></td><td>3.5 stars</td></tr>
+<tr><td>ADO Rating</td><td>2 stars</td></tr>
+
+<tr><td>&nbsp;</td><td></td></tr>
+
+<tr><td>Artist</td><td>Bob Dylan</td></tr>
+<tr><td>CD</td><td>The Times They Are a-Changin'</td></tr>
+<tr><td>Copyright Date</td><td>1964</td></tr>
+<tr><td>Label</td><td>Columbia</td></tr>
+<tr><td>ID</td><td>CK-8905</td></tr>
+<tr><td>Total Time</td><td>45:36</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/the-times-they-a-changin-mw0000202344">AMG Rating</a></td><td>4.5 stars</td></tr>
+<tr><td>ADO Rating</td><td>1.5 stars</td></tr>
+<tr><td>Notes<td>The title song is also available on "Bob Dylan's Greatest Hits" and "The Essential Bob Dylan."</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+
+<tr><td>Artist</td><td>Luciana Souza</td></tr>
+<tr><td>CD</td><td>Tide</td></tr>
+<tr><td>Copyright Date</td><td>2009</td></tr>
+<tr><td>Label</td><td>Universal Jazz France</td></tr>
+<tr><td>ID</td><td>B0012688-02</td></tr>
+<tr><td>Total Time</td><td>42:31</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/tide-mw0000815692">AMG Rating</a></td><td>3.5 stars</td></tr>
+<tr><td>ADO Rating</td><td>2.5 stars</td></tr>
+<tr><td>Notes<td>Includes the song "Fire and Wood" with the lyric
+"The clocks were turned back you remember/Think it's still November."
+</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+<tr><td>Artist</td><td>Ken Nordine</td></tr>
+<tr><td>CD</td><td>You're Getting Better: The Word Jazz Dot Masters</td></tr>
+<tr><td>Copyright Date</td><td>2005</td></tr>
+<tr><td>Label</td><td>Geffen</td></tr>
+<tr><td>ID</td><td>B0005171-02</td></tr>
+<tr><td>Total Time</td><td>156:22</td></tr>
+<tr><td>ADO Rating</td><td>1 star</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/youre-getting-better-the-word-jazz-dot-masters-mw0000736197">AMG Rating</a></td><td>4.5 stars</td></tr>
+<tr><td>Notes</td><td>Includes the piece "What Time Is It"
+("He knew what time it was everywhere...that counted").</td></tr>
+<tr><td>&nbsp;</td><td></td></tr>
+<tr><td>Artist</td><td>Chicago</td></tr>
+<tr><td>CD</td><td>Chicago Transit Authority</td></tr>
+<tr><td>Copyright Date</td><td>1969</td></tr>
+<tr><td>Label</td><td>Columbia</td></tr>
+<tr><td>ID</td><td>64409</td></tr>
+<tr><td>Total Time</td><td>1:16:20</td></tr>
+<tr><td><a href="https://www.allmusic.com/album/chicago-transit-authority-mw0000189364">AMG Rating</a></td><td>4 stars</td></tr>
+<tr><td>Notes</td><td>Includes the song "Does Anybody Really Know What Time It Is?"</td></tr>
+</table>
+<h2>Comics</h2>
+<ul>
+<li>
+The webcomic <em>xkcd</em> has the strip
+"<a href="https://xkcd.com/673/">The Sun</a>" (2009-12-09) and the panels
+"<a href="https://xkcd.com/1017/">Backward in Time</a>" (2012-02-14),
+"<a href="https://xkcd.com/1061/">EST</a>" (2012-05-28),
+"<a href="https://xkcd.com/1179/">ISO 8601</a>" (2013-02-27),
+"<a href="https://xkcd.com/1335/">Now</a>" (2014-02-26),
+"<a href="https://xkcd.com/1655/">Doomsday Clock</a>" (2016-03-14),
+"<a href="https://xkcd.com/1799/">Bad Map Projection: Time Zones</a>"
+(2017-02-15),
+"<a href="https://xkcd.com/1883/">Supervillain Plan</a>" (2017-08-30),
+"<a href="https://xkcd.com/2050/">6/6 Time</a>" (2018-09-24),
+and "<a href="https://xkcd.com/2266/">Leap Smearing</a>" (2020-02-10).
+The related book <em>What If?</em> has an entry
+"<a href="https://what-if.xkcd.com/26/">Leap Seconds</a>" (2012-12-31).
+</li>
+<li>
+Pig kills time in <a
+href="https://www.gocomics.com/pearlsbeforeswine/2016/11/06"><em>Pearls
+Before Swine</em> (2016-11-06)</a>.
+</li>
+<li>
+Stonehenge is abandoned in <a
+href="https://www.gocomics.com/nonsequitur/2017/03/12"><em>Non Sequitur</em>
+(2017-03-12)</a>.
+<li>
+The boss freaks out in <a
+href="https://dilbert.com/strip/1998-03-14"><em>Dilbert</em> (1998-03-14)</a>.
+</li>
+<li>
+Peppermint Patty: "What if the world comes to an end tonight, Marcie?"
+<br>
+Marcie: "I promise there'll be a tomorrow, sir ... in fact,
+it's already tomorrow in Australia!"
+<br>
+(Charles M. Schulz, <a href="https://www.gocomics.com/peanuts/1980/06/13"><em>Peanuts</em>, 1980-06-13</a>)
+</li>
+</ul>
+<h2>Jokes</h2>
+<ul>
+<li>
+The idea behind daylight saving time was first proposed as a joke by
+Benjamin Franklin. To enforce it, he suggested, "Every
+morning, as soon as the sun rises, let all the bells in every church
+be set ringing; and if that is not sufficient, let cannon be fired in
+every street, to wake the sluggards effectually, and make them open
+their eyes to see their true interest. All the difficulty will be in
+the first two or three days: after which the reformation will be as
+natural and easy as the present irregularity; for, <em>ce n'est que le
+premier pas qui co&ucirc;te</em>."
+<a href="http://www.webexhibits.org/daylightsaving/franklin3.html">Franklin's
+joke</a> was first published on 1784-04-26 by the
+<em>Journal de Paris</em> as <a
+href="https://en.wikipedia.org/wiki/File:Franklin-Benjamin-Journal-de-Paris-1784.jpg">an
+anonymous letter translated into French</a>.
+</li>
+<li>
+"We've been using the five-cent nickel in this country since 1492.
+Now that's pretty near 100 years, daylight saving."
+(Groucho Marx as Captain Spaulding in <em>Animal Crackers</em>, 1930,
+as noted by Will Fitzgerald)
+</li>
+<li>
+BRADY. ...[Bishop Usher] determined that the Lord began the Creation
+on the 23rd of October in the Year 4,004 B.C. at &ndash; uh, 9 A.M.!
+<br>
+DRUMMOND. That Eastern Standard Time? (<em>Laughter.</em>) Or Rocky Mountain
+Time? (<em>More laughter.</em>) It wasn't daylight-saving time, was it? Because
+the Lord didn't make the sun until the fourth day!
+<br>
+(From the play <em>Inherit the Wind</em> by Jerome Lawrence and Robert E. Lee,
+filmed in 1960 with Spencer Tracy as Drummond and Fredric March as
+Brady, and several other times. Thanks to Mark Brader.)
+</li>
+<li>
+"Good news."
+"What did they do? Extend Daylight Saving Time year round?"
+(Professional tanner George Hamilton, in dialog from a
+May, 1999 episode of the syndicated television series <em>Baywatch</em>)
+</li>
+<li>
+"A fundamental belief held by Americans is that if you are on land, you
+cannot be killed by a fish...So most Americans remain on land, believing
+they're safe. Unfortunately, this belief &ndash; like so many myths, such as that
+there's a reason for 'Daylight Saving Time' &ndash; is false."
+(Dave Barry column, 2000-07-02)
+</li>
+<li>
+"I once had sex for an hour and five minutes, but that was on the day
+when you turn the clocks ahead."
+(Garry Shandling, 52nd Annual Emmys, 2000-09-10)
+</li>
+<li>
+"Would it impress you if I told you I invented Daylight Savings Time?"
+("Sahjhan" to "Lilah" in dialog from the "Loyalty" episode of <em>Angel</em>,
+originally aired 2002-02-25)
+</li>
+<li>
+"I thought you said Tulsa was a three-hour flight."
+"Well, you're forgetting about the time difference."
+("Joey" and "Chandler" in dialog from the episode of <em>Friends</em>
+entitled "The One With Rachel's Phone Number," originally aired 2002-12-05)
+</li>
+<li>
+"Is that a pertinent fact,
+or are you just trying to dazzle me with your command of time zones?"
+(Kelsey Grammer as "Frasier Crane" to "Roz" from the episode of <em>Frasier</em>
+entitled "The Kid," originally aired 1997-11-04)
+</li>
+<li>
+"I put myself and my staff through this crazy, huge ordeal, all because
+I refused to go on at midnight, okay?  And so I work, you know, and
+then I get this job at eleven, supposed to be a big deal.  Then
+yesterday daylight [saving] time ended. Right now it's basically
+midnight." (Conan O'Brien on the 2010-11-08 premiere of <em>Conan</em>.)
+</li>
+<li>
+"The best method, I told folks, was to hang a large clock high on a
+barn wall where all the cows could see it. If you have Holsteins, you
+will need to use an analog clock." (Jerry Nelson, <a
+href="http://www.agriculture.com/family/farm-humor/how-to-adjust-dairy-cows-to-daylight-savings-time">How
+to adjust dairy cows to daylight saving time</a>", <em>Successful Farming</em>,
+2017-10-09.)
+</li>
+<li>
+"And now, driving to California, I find that I must enter a password
+in order to change the time zone on my laptop clock. Evidently,
+someone is out to mess up my schedule and my clock must be secured."
+(Garrison Keillor,
+"<a href="http://www.garrisonkeillor.com/weve-never-been-here-before/">We've
+never been here before</a>", 2017-08-22)
+</li>
+<li>
+"Well, in my time zone that's all the time I have,
+but maybe in your time zone I haven't finished yet. So stay tuned!"
+(Goldie Hawn, <em>Rowan &amp; Martin's Laugh-In</em> No. 65, 1970-03-09)
+</li>
+</ul>
+<h2>See also</h2>
+<ul>
+<li><a href="tz-link.html">Time Zone and Daylight Saving
+Time Data</a></li>
+</ul>
+<hr>
+<address>
+This web page is in the public domain, so clarified as of
+2009-05-17 by Arthur David Olson.
+<br>
+Please send corrections to this web page to the
+<a href="mailto:tz@iana.org">time zone mailing list</a>.
+</address>
+</body>
+</html>
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tz-how-to.html
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tz-how-to.html
@@ -0,0 +1,719 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<title>How to Read the tz Database</title>
+<meta charset="UTF-8">
+<style>
+pre {margin-left: 2em; white-space: pre-wrap;}
+pre.td {margin-left: 0;}
+td {text-align: center;}
+table {border: 1px outset;}
+th, td {border: 1px inset;}
+table.rule {border: none; margin: auto;}
+td.footnote {text-align: left;}
+</style>
+</head>
+<body>
+<h2>How to Read the <a href="https://en.wikipedia.org/wiki/Tz_database">tz
+Database</a> Source Files</h2>
+<h3>by Bill Seymour</h3>
+<p>This guide uses the <code>America/Chicago</code> and
+<code>Pacific/Honolulu</code> zones as examples of how to infer
+times of day from the <a href="tz-link.html">tz database</a>
+source files. It might be helpful, but not absolutely necessary,
+for the reader to have already downloaded the
+latest release of the database and become familiar with the basic layout
+of the data files. The format is explained in the &ldquo;man
+page&rdquo; for the zic compiler, <code>zic.8.txt</code>, in
+the <code>code</code> subdirectory.
+Although this guide covers many of the common cases, it is not a
+complete summary of what zic accepts; the man page is the
+authoritative reference.</p>
+
+<p>We&rsquo;ll begin by talking about the rules for changing between standard
+and daylight saving time since we&rsquo;ll need that information when we talk
+about the zones.</p>
+
+<p>First, let&rsquo;s consider the special daylight saving time rules
+for Chicago (from the <code>northamerica</code> file in
+the <code>data</code> subdirectory):</p>
+
+<table>
+<tr>
+  <th colspan="6">From the Source File</th>
+</tr>
+<tr>
+  <td colspan="6">
+    <table class="rule">
+      <tr><td style="border:none;text-align:left">
+<pre class="td">
+#Rule NAME    FROM TO    -   IN  ON      AT   SAVE LETTER
+Rule  Chicago 1920 only  -   Jun 13      2:00 1:00 D
+Rule  Chicago 1920 1921  -   Oct lastSun 2:00 0    S
+Rule  Chicago 1921 only  -   Mar lastSun 2:00 1:00 D
+Rule  Chicago 1922 1966  -   Apr lastSun 2:00 1:00 D
+Rule  Chicago 1922 1954  -   Sep lastSun 2:00 0    S
+Rule  Chicago 1955 1966  -   Oct lastSun 2:00 0    S
+</pre>
+  </td></tr></table></td>
+</tr>
+<tr>
+  <th colspan="6">Reformatted a Bit</th>
+</tr>
+<tr>
+  <th>From</th>
+  <th>To</th>
+  <th colspan="2">On</th>
+  <th>At</th>
+  <th>Action</th>
+</tr>
+<tr>
+  <td colspan="2">1920 only</td>
+  <td colspan="2">June 13<small><sup>th</sup></small></td>
+  <td rowspan="6">02:00 local</td>
+  <td>go to daylight saving time</td>
+</tr>
+<tr>
+  <td>1920</td>
+  <td>1921</td>
+  <td rowspan="5">last Sunday</td>
+  <td>in October</td>
+  <td>return to standard time</td>
+</tr>
+<tr>
+  <td colspan="2">1921 only</td>
+  <td>in March</td>
+  <td rowspan="2">go to daylight saving time</td>
+</tr>
+<tr>
+  <td rowspan="2">1922</td>
+  <td>1966</td>
+  <td>in April</td>
+</tr>
+<tr>
+  <td>1954</td>
+  <td>in September</td>
+  <td rowspan="2">return to standard time</td>
+</tr>
+<tr>
+  <td>1955</td>
+  <td>1966</td>
+  <td>in October</td>
+</tr>
+</table>
+
+<p>The <code>FROM</code> and <code>TO</code> columns, respectively, specify the
+first and last calendar years defining a contiguous range over which a specific
+Rule line is to apply.  The keyword <code>only</code> can be used in the
+<code>TO</code> field to repeat the value of the <code>FROM</code> field in the
+event that a rule should only apply to a single year.  Often, the keyword
+<code>max</code> is used to extend a rule&rsquo;s application into the
+indefinite future; it is a platform-agnostic stand-in for the largest
+representable year.
+
+<p>The next column, <code>-</code>, is reserved; for compatibility with earlier
+releases, it always contains a hyphen, which acts as a kind of null value.
+Prior to the 2020b release, it was called the <code>TYPE</code> field, though
+it had not been used in the main data since the 2000e release.
+An obsolescent supplementary file used the
+field as a proof-of-concept to allow <code>zic</code> to apply a given Rule
+line only to certain &ldquo;types&rdquo; of years within the specified range as
+dictated by the output of a separate script, such as: only years which would
+have a US presidential election, or only years which wouldn&rsquo;t.
+
+<p>The <code>SAVE</code> column contains the local (wall clock) offset from
+local standard time.
+This is usually either zero for standard time or one hour for daylight
+saving time; but there&rsquo;s no reason, in principle, why it can&rsquo;t
+take on other values.
+
+<p>The <code>LETTER</code> (sometimes called <code>LETTER/S</code>)
+column can contain a variable
+part of the usual abbreviation of the time zone&rsquo;s name, or it can just
+be a hyphen if there&rsquo;s no variable part. For example, the abbreviation
+used in the central time zone will be either &ldquo;CST&rdquo; or
+&ldquo;CDT&rdquo;. The variable part is &lsquo;S&rsquo; or &lsquo;D&rsquo;;
+and, sure enough, that&rsquo;s just what we find in
+the <code>LETTER</code> column
+in the <code>Chicago</code> rules. More about this when we talk about
+&ldquo;Zone&rdquo; lines.
+
+<p>One important thing to notice is that &ldquo;Rule&rdquo; lines
+want at once to be both <i>transitions</i> and <i>steady states</i>:
+<ul>
+<li>On the one hand, they represent transitions between standard and
+daylight saving time; and any number of Rule lines can be in effect
+during a given period (which will always be a non-empty set of
+contiguous calendar years).</li>
+<li>On the other hand, the <code>SAVE</code> and <code>LETTER</code>
+columns contain state that exists between transitions. More about this
+when we talk about the US rules.</li>
+</ul>
+
+<p>In the example above, the transition to daylight saving time
+happened on the 13<small><sup>th</sup></small> of June in 1920, and on
+the last Sunday in March in 1921; but the return to standard time
+happened on the last Sunday in October in both of those
+years. Similarly, the rule for changing to daylight saving time was
+the same from 1922 to 1966; but the rule for returning to standard
+time changed in 1955. Got it?</p>
+
+<p>OK, now for the somewhat more interesting &ldquo;US&rdquo; rules:</p>
+
+<table>
+<tr>
+  <th colspan="6">From the Source File</th>
+</tr>
+<tr>
+  <td colspan="6">
+    <table class="rule">
+      <tr><td style="border:none;text-align:left">
+<pre class="td">
+#Rule NAME FROM TO    -   IN  ON        AT   SAVE LETTER/S
+Rule  US   1918 1919  -   Mar lastSun  2:00  1:00 D
+Rule  US   1918 1919  -   Oct lastSun  2:00  0    S
+Rule  US   1942 only  -   Feb 9        2:00  1:00 W # War
+Rule  US   1945 only  -   Aug 14      23:00u 1:00 P # Peace
+Rule  US   1945 only  -   Sep 30       2:00  0    S
+Rule  US   1967 2006  -   Oct lastSun  2:00  0    S
+Rule  US   1967 1973  -   Apr lastSun  2:00  1:00 D
+Rule  US   1974 only  -   Jan 6        2:00  1:00 D
+Rule  US   1975 only  -   Feb 23       2:00  1:00 D
+Rule  US   1976 1986  -   Apr lastSun  2:00  1:00 D
+Rule  US   1987 2006  -   Apr Sun&gt;=1   2:00  1:00 D
+Rule  US   2007 max   -   Mar Sun&gt;=8   2:00  1:00 D
+Rule  US   2007 max   -   Nov Sun&gt;=1   2:00  0    S
+</pre>
+  </td></tr></table></td>
+</tr>
+<tr>
+  <th colspan="6">Reformatted a Bit</th>
+</tr>
+<tr>
+  <th>From</th>
+  <th>To</th>
+  <th colspan="2">On</th>
+  <th>At</th>
+  <th>Action</th>
+</tr>
+<tr>
+  <td rowspan="2">1918</td>
+  <td rowspan="2">1919</td>
+  <td rowspan="2">last Sunday</td>
+  <td>in March</td>
+  <td rowspan="3">02:00 local</td>
+  <td>go to daylight saving time</td>
+</tr>
+<tr>
+  <td>in October</td>
+  <td>return to standard time</td>
+</tr>
+<tr>
+  <td colspan="2">1942 only</td>
+  <td colspan="2">February 9<small><sup>th</sup></small></td>
+  <td>go to &ldquo;war time&rdquo;</td>
+</tr>
+<tr>
+  <td colspan="2" rowspan="2">1945 only</td>
+  <td colspan="2">August 14<small><sup>th</sup></small></td>
+  <td>23:00 <a href="https://en.wikipedia.org/wiki/Universal_Time">UT</a></td>
+  <td>
+    rename &ldquo;war time&rdquo; to &ldquo;peace<br>time;&rdquo;
+    clocks don&rsquo;t change
+  </td>
+</tr>
+<tr>
+  <td colspan="2">September 30<small><sup>th</sup></small></td>
+  <td rowspan="9">02:00 local</td>
+  <td rowspan="2">return to standard time</td>
+</tr>
+<tr>
+  <td rowspan="2">1967</td>
+  <td>2006</td>
+  <td rowspan="2">last Sunday</td>
+  <td>in October</td>
+</tr>
+<tr>
+  <td>1973</td>
+  <td>in April</td>
+  <td rowspan="6">go to daylight saving time</td>
+</tr>
+<tr>
+  <td colspan="2">1974 only</td>
+  <td colspan="2">January 6<small><sup>th</sup></small></td>
+</tr>
+<tr>
+  <td colspan="2">1975 only</td>
+  <td colspan="2">February 23<small><sup>rd</sup></small></td>
+</tr>
+<tr>
+  <td>1976</td>
+  <td>1986</td>
+  <td>last Sunday</td>
+  <td rowspan="2">in April</td>
+</tr>
+<tr>
+  <td>1987</td>
+  <td>2006</td>
+  <td>first Sunday</td>
+</tr>
+<tr>
+  <td rowspan="2">2007</td>
+  <td rowspan="2">present</td>
+  <td colspan="2">second Sunday in March</td>
+</tr>
+<tr>
+  <td colspan="2">first Sunday in November</td>
+  <td>return to standard time</td>
+</tr>
+</table>
+
+<p>There are two interesting things to note here.</p>
+
+<p>First, the time that something happens (in the <code>AT</code>
+column) is not necessarily the local (wall clock) time. The time can be
+suffixed with &lsquo;s&rsquo; (for &ldquo;standard&rdquo;) to mean
+local standard time, different from local (wall clock) time when observing
+daylight saving time; or it can be suffixed with &lsquo;g&rsquo;,
+&lsquo;u&rsquo;, or &lsquo;z&rsquo;, all three of which mean the
+standard time at the
+<a href="https://en.wikipedia.org/wiki/Prime_Meridian">prime meridian</a>.
+&lsquo;g&rsquo; stands for &ldquo;<a
+href="https://en.wikipedia.org/wiki/Greenwich_Mean_Time">GMT</a>&rdquo;;
+&lsquo;u&rsquo; stands for &ldquo;<a
+href="https://en.wikipedia.org/wiki/Universal_Time">UT</a>&rdquo; or &ldquo;<a
+href="https://en.wikipedia.org/wiki/Coordinated_Universal_Time">UTC</a>&rdquo;
+(whichever was official at the time); &lsquo;z&rsquo; stands for the
+<a href="https://en.wikipedia.org/wiki/Nautical_time">nautical time zone</a>
+Z (a.k.a. &ldquo;Zulu&rdquo; which, in turn, stands for &lsquo;Z&rsquo;).
+The time can also be suffixed with &lsquo;w&rsquo; meaning local (wall
+clock) time; but it usually isn&rsquo;t because that&rsquo;s the
+default.</p>
+
+<p>Second, the day in the <code>ON</code> column, in addition to
+&ldquo;<code>lastSun</code>&rdquo; or a particular day of the month,
+can have the form, &ldquo;<code>Sun&gt;=</code><i>x</i>&rdquo; or
+&ldquo;<code>Sun&lt;=</code><i>x</i>,&rdquo; where <i>x</i> is a day
+of the month. For example, &ldquo;<code>Sun&gt;=8</code>&rdquo; means
+&ldquo;the first Sunday on or after the eighth of the month,&rdquo; in
+other words, the second Sunday of the month. Furthermore, although
+there are no examples above, the weekday needn&rsquo;t be
+&ldquo;<code>Sun</code>&rdquo; in either form, but can be the usual
+three-character English abbreviation for any day of the week.</p>
+
+<p>And the US rules give us more examples of a couple of things
+already mentioned:</p>
+
+<ul>
+<li>The rules for changing to and from daylight saving time are
+actually <i>different sets</i> of rules; and the two sets can change
+independently. Consider, for example, that the rule for the return to
+standard time stayed the same from 1967 to 2006; but the rule for the
+transition to daylight saving time changed several times in the same
+period.  There can also be periods, 1946 to 1966 for example, when no
+rule from this group is in effect, and so either no transition
+happened in those years, or some other rule is in effect (perhaps a
+state or other more local rule).</li>
+
+<li>The <code>SAVE</code> and <code>LETTER</code> columns
+contain <i>steady state</i>, not transitions. Consider, for example,
+the transition from &ldquo;war time&rdquo; to &ldquo;peace time&rdquo;
+that happened on August 14, 1945. The &ldquo;1:00&rdquo; in
+the <code>SAVE</code> column is <i>not</i> an instruction to advance
+the clock an hour. It means that clocks should <i>be</i> one hour
+ahead of standard time, which they already are because of the previous
+rule, so there should be no change.</li>
+
+</ul>
+
+<p>OK, now let&rsquo;s look at a Zone record:</p>
+
+<table>
+<tr>
+  <th colspan="5">From the Source File</th>
+</tr>
+<tr>
+  <td colspan="5">
+    <table class="rule">
+      <tr><td style="border:none;text-align:left">
+<pre class="td">
+#Zone       NAME      STDOFF   RULES FORMAT [UNTIL]
+Zone  America/Chicago -5:50:36 -       LMT  1883 Nov 18 12:09:24
+                      -6:00    US      C%sT 1920
+                      -6:00    Chicago C%sT 1936 Mar  1  2:00
+                      -5:00    -       EST  1936 Nov 15  2:00
+                      -6:00    Chicago C%sT 1942
+                      -6:00    US      C%sT 1946
+                      -6:00    Chicago C%sT 1967
+                      -6:00    US      C%sT
+</pre>
+  </td></tr></table></td>
+</tr>
+<tr>
+  <th colspan="5">Columns Renamed</th>
+</tr>
+<tr>
+  <th rowspan="2">Standard Offset<br>
+    from <a href="https://en.wikipedia.org/wiki/Prime_Meridian">Prime
+    Meridian</a></th>
+  <th rowspan="2">Daylight<br>Saving Time</th>
+  <th rowspan="2">Abbreviation(s)</th>
+  <th colspan="2">Ending at Local Time</th>
+</tr>
+<tr>
+  <th>Date</th>
+  <th>Time</th>
+</tr>
+<tr>
+  <td>&minus;5:50:36</td>
+  <td>not observed</td>
+  <td>LMT</td>
+  <td>1883-11-18</td>
+  <td>12:09:24</td>
+</tr>
+<tr>
+  <td rowspan="2">&minus;6:00:00</td>
+  <td>US rules</td>
+  <td rowspan="2">CST or CDT</td>
+  <td>1920-01-01</td>
+  <td>00:00:00</td>
+</tr>
+<tr>
+  <td>Chicago rules</td>
+  <td>1936-03-01</td>
+  <td rowspan="2">02:00:00</td>
+</tr>
+<tr>
+  <td>&minus;5:00:00</td>
+  <td>not observed</td>
+  <td>EST</td>
+  <td>1936-11-15</td>
+</tr>
+<tr>
+  <td rowspan="4">&minus;6:00:00</td>
+  <td>Chicago rules</td>
+  <td>CST or CDT</td>
+  <td>1942-01-01</td>
+  <td rowspan="3">00:00:00</td>
+</tr>
+<tr>
+  <td>US rules</td>
+  <td>CST, CWT or CPT</td>
+  <td>1946-01-01</td>
+</tr>
+<tr>
+  <td>Chicago rules</td>
+  <td rowspan="2">CST or CDT</td>
+  <td>1967-01-01</td>
+</tr>
+<tr>
+  <td>US rules</td>
+  <td colspan="2">&mdash;</td>
+</tr>
+</table>
+
+<p>There are a couple of interesting differences between Zones and Rules.</p>
+
+<p>First, and somewhat trivially, whereas Rules are considered to
+contain one or more records, a Zone is considered to be a single
+record with zero or more <i>continuation lines</i>. Thus, the keyword,
+&ldquo;<code>Zone</code>,&rdquo; and the zone name are not
+repeated. The last line is the one without anything in
+the <code>[UNTIL]</code> column.</p>
+
+<p>Second, and more fundamentally, each line of a Zone represents a
+steady state, not a transition between states. The state exists from
+the date and time in the previous line&rsquo;s <code>[UNTIL]</code>
+column up to the date and time in the current
+line&rsquo;s <code>[UNTIL]</code> column. In other words, the date and
+time in the <code>[UNTIL]</code> column is the instant that separates
+this state from the next. Where that would be ambiguous because
+we&rsquo;re setting our clocks back, the <code>[UNTIL]</code> column
+specifies the first occurrence of the instant. The state specified by
+the last line, the one without anything in the <code>[UNTIL]</code>
+column, continues to the present.</p>
+
+<p>The first line typically specifies the mean solar time observed
+before the introduction of standard time. Since there&rsquo;s no line before
+that, it has no beginning. <code>8-) </code> For some places near the <a
+href="https://en.wikipedia.org/wiki/International_Date_Line">International
+Date Line</a>, the first <i>two</i> lines will show solar times
+differing by 24 hours; this corresponds to a movement of the Date
+Line.  For example:</p>
+
+<pre>
+#Zone NAME          STDOFF   RULES FORMAT [UNTIL]
+Zone America/Juneau 15:02:19 -     LMT    1867 Oct 18
+                    -8:57:41 -     LMT    ...
+</pre>
+
+<p>When Alaska was purchased from Russia in 1867, the Date Line moved
+from the Alaska/Canada border to the Bering Strait; and the time in
+Alaska was then 24 hours earlier than it had
+been. <code>&lt;aside&gt;</code>(6 October in the Julian calendar,
+which Russia was still using then for religious reasons, was followed
+by <i>a second instance of the same day with a different name</i>, 18
+October in the Gregorian calendar. Isn&rsquo;t civil time
+wonderful? <code>8-)</code>)<code>&lt;/aside&gt;</code></p>
+
+<p>The abbreviation, &ldquo;LMT&rdquo; stands for &ldquo;local mean
+time&rdquo;, which is an invention of
+the <a href="https://en.wikipedia.org/wiki/Tz_database">tz
+database</a> and was probably never actually used during the
+period. Furthermore, the value is almost certainly wrong except in the
+archetypal place after which the zone is named. (The tz database
+usually doesn&rsquo;t provide a separate Zone record for places where
+nothing significant happened after 1970.)</p>
+
+<p>The <code>RULES</code> column tells us whether daylight saving time is being observed:
+<ul>
+<li>A hyphen, a kind of null value, means that we have not set our
+clocks ahead of standard time.</li>
+
+<li>An amount of time (usually but not necessarily &ldquo;1:00&rdquo;
+meaning one hour) means that we have set our clocks ahead by that
+amount.</li>
+
+<li>Some alphabetic string means that we <i>might have</i> set our
+clocks ahead; and we need to check the rule the name of which is the
+given alphabetic string.</li>
+</ul>
+
+<p>An example of a specific amount of time is:</p>
+<pre>
+#Zone NAME            STDOFF RULES FORMAT [UNTIL]
+Zone Pacific/Honolulu ...                 1933 Apr 30  2:00
+                      -10:30 1:00  HDT    1933 May 21 12:00
+                      ...
+</pre>
+
+<p>Hawaii tried daylight saving time for three weeks in 1933 and
+decided they didn&rsquo;t like it. <code>8-) </code>Note that
+the <code>STDOFF</code> column always contains the standard time
+offset, so the local (wall clock) time during this period was GMT &minus;
+10:30 + 1:00 = GMT &minus; 9:30.</p>
+
+<p>The <code>FORMAT</code> column specifies the usual abbreviation of
+the time zone name. It should have one of four forms:</p>
+<ul>
+
+<li>a time zone abbreviation that is a string of three or more
+characters that are either ASCII alphanumerics,
+&ldquo;<code>+</code>&rdquo;, or &ldquo;<code>-</code>&rdquo;</li>
+
+<li>the string &ldquo;%z&rdquo;, in which case the
+&ldquo;<code>%z</code>&rdquo; will be replaced by a numeric time zone
+abbreviation</li>
+
+<li>a pair of time zone abbreviations separated by a slash
+(&lsquo;<code>/</code>&rsquo;), in which case the first string is the
+abbreviation for the standard time name and the second string is the
+abbreviation for the daylight saving time name</li>
+
+<li>a string containing &ldquo;<code>%s</code>&rdquo;, in which case
+the &ldquo;<code>%s</code>&rdquo; will be replaced by the text in the
+appropriate Rule&rsquo;s <code>LETTER</code> column, and the resulting
+string should be a time zone abbreviation</li>
+</ul>
+
+<p>The last two make sense only if there&rsquo;s a named rule in effect.</p>
+
+<p>An example of a slash is:</p>
+<pre>
+#Zone NAME          STDOFF RULES FORMAT  [UNTIL]
+Zone  Europe/London ...                  1996
+                    0:00   EU    GMT/BST
+</pre>
+
+<p>The current time in the UK is called either Greenwich mean time or
+British summer time.</p>
+
+<p>One wrinkle, not fully explained in <code>zic.8.txt</code>, is what
+happens when switching to a named rule. To what values should
+the <code>SAVE</code> and <code>LETTER</code> data be initialized?</p>
+
+<ul>
+<li>If at least one transition has happened, use
+the <code>SAVE</code> and <code>LETTER</code> data from the most
+recent.</li>
+
+<li>If switching to a named rule before any transition has happened,
+assume standard time (<code>SAVE</code> zero), and use
+the <code>LETTER</code> data from the earliest transition with
+a <code>SAVE</code> of zero.
+
+</ul>
+
+<p>And three last things about the <code>FORMAT</code> column:</p>
+<ul>
+
+<li>The <a href="https://en.wikipedia.org/wiki/Tz_database">tz
+database</a> gives abbreviations for time zones in <i>popular
+usage</i>, which is not necessarily &ldquo;correct&rdquo; by law. For
+example, the last line in
+<code>Zone</code> <code>Pacific/Honolulu</code> (shown below) gives
+&ldquo;HST&rdquo; for &ldquo;Hawaii standard time&rdquo; even though the
+<a href="https://www.law.cornell.edu/uscode/text/15/263">legal</a>
+name for that time zone is &ldquo;Hawaii-Aleutian standard time.&rdquo;
+This author has read that there are also some places in Australia where
+popular time zone names differ from the legal ones.
+
+<li>No attempt is made to <a
+href="https://en.wikipedia.org/wiki/Internationalization_and_localization">localize</a>
+the abbreviations. They are intended to be the values returned through the
+<code>"%Z"</code> format specifier to
+<a href="https://en.wikipedia.org/wiki/C_(programming_language)">C</a>&rsquo;s
+<a href="https://pubs.opengroup.org/onlinepubs/9699919799/functions/strftime.html"><code>strftime</code></a>
+function in the
+<a href="https://kirste.userpage.fu-berlin.de/chemnet/use/info/libc/libc_19.html#SEC324">&ldquo;C&rdquo; locale</a>.
+
+<li>If there is no generally-accepted abbreviation for a time zone,
+a numeric offset is used instead, e.g., <code>+07</code> for 7 hours
+ahead of Greenwich. By convention, <code>-00</code> is used in a
+zone while uninhabited, where the offset is zero but in some sense
+the true offset is undefined.
+</ul>
+
+<p>As a final example, here&rsquo;s the complete history for Hawaii:</p>
+
+<table>
+<tr>
+  <th colspan="6">Relevant Excerpts from the US Rules</th>
+</tr>
+<tr>
+  <td colspan="6">
+    <table class="rule">
+      <tr><td style="border:none;text-align:left">
+<pre class="td">
+#Rule NAME FROM TO   -    IN  ON      AT     SAVE LETTER/S
+Rule  US   1918 1919 -    Oct lastSun  2:00  0    S
+Rule  US   1942 only -    Feb  9       2:00  1:00 W # War
+Rule  US   1945 only -    Aug 14      23:00u 1:00 P # Peace
+Rule  US   1945 only -    Sep lastSun  2:00  0    S
+</pre>
+  </td></tr></table></td>
+</tr>
+<tr>
+  <th colspan="6">The Zone Record</th>
+</tr>
+<tr>
+  <td colspan="6">
+    <table class="rule">
+      <tr><td style="border:none;text-align:left">
+<pre class="td">
+#Zone NAME            STDOFF    RULES FORMAT [UNTIL]
+Zone Pacific/Honolulu -10:31:26 -     LMT    1896 Jan 13 12:00
+                      -10:30    -     HST    1933 Apr 30  2:00
+                      -10:30    1:00  HDT    1933 May 21  2:00
+                      -10:30    US    H%sT   1947 Jun  8  2:00
+                      -10:00    -     HST
+</pre>
+  </td></tr></table></td>
+</tr>
+<tr>
+  <th colspan="6">What We Infer</th>
+</tr>
+<tr>
+  <th rowspan="2">Wall-Clock<br>Offset from<br>Prime Meridian</th>
+  <th rowspan="2">Adjust<br>Clocks</th>
+  <th colspan="2">Time Zone</th>
+  <th colspan="2">Ending at Local Time</th>
+</tr>
+<tr>
+  <th>Abbrv.</th>
+  <th>Name</th>
+  <th>Date</th>
+  <th>Time</th>
+</tr>
+<tr>
+  <td>&minus;10:31:26</td>
+  <td>&mdash;</td>
+  <td>LMT</td>
+  <td>local mean time</td>
+  <td>1896-01-13</td>
+  <td>12:00</td>
+</tr>
+<tr>
+  <td>&minus;10:30</td>
+  <td>+0:01:26</td>
+  <td>HST</td>
+  <td>Hawaii standard time</td>
+  <td>1933-04-30</td>
+  <td>02:00</td>
+</tr>
+<tr>
+  <td>&minus;9:30</td>
+  <td>+1:00</td>
+  <td>HDT</td>
+  <td>Hawaii daylight time</td>
+  <td>1933-05-21</td>
+  <td>12:00</td>
+</tr>
+<tr>
+  <td>&minus;10:30&sup1;</td>
+  <td>&minus;1:00&sup1;</td>
+  <td>HST&sup1;</td>
+  <td>Hawaii standard time</td>
+  <td>1942-02-09</td>
+  <td>02:00</td>
+</tr>
+<tr>
+  <td rowspan="2">&minus;9:30</td>
+  <td>+1:00</td>
+  <td>HWT</td>
+  <td>Hawaii war time</td>
+  <td>1945-08-14</td>
+  <td>13:30&sup2;</td>
+</tr>
+<tr>
+  <td>0</td>
+  <td>HPT</td>
+  <td>Hawaii peace time</td>
+  <td>1945-09-30</td>
+  <td rowspan="2">02:00</td>
+</tr>
+<tr>
+  <td>&minus;10:30</td>
+  <td>&minus;1:00</td>
+  <td rowspan="2">HST</td>
+  <td rowspan="2">Hawaii standard time</td>
+  <td>1947-06-08</td>
+</tr>
+<tr>
+  <td>&minus;10:00&sup3;</td>
+  <td>+0:30&sup3;</td>
+  <td colspan="2">&mdash;</td>
+</tr>
+<tr>
+  <td colspan="6" class="footnote">
+    &sup1;Switching to US rules&hellip;most recent transition (in 1919) was to standard time
+  </td>
+</tr>
+<tr>
+  <td colspan="6" class="footnote">
+    &sup2;23:00 <a href="https://en.wikipedia.org/wiki/Universal_Time">UT</a>
+    + (&minus;9:30) = 13:30 local
+  </td>
+</tr>
+<tr>
+  <td colspan="6" class="footnote">
+    &sup3;Since <a href="https://en.wikipedia.org/wiki/ISO_8601">1947&ndash;06&ndash;08T12:30Z</a>,
+    the civil time in Hawaii has been
+    <a href="https://en.wikipedia.org/wiki/Universal_Time">UT</a>/<a href="https://en.wikipedia.org/wiki/Coordinated_Universal_Time">UTC</a>
+    &minus; 10:00 year-round.
+  </td>
+</tr>
+</table>
+
+<p>There will be a short quiz later. <code>8-)</code></p>
+
+<hr>
+<address>
+This web page is in the public domain, so clarified as of
+2015-10-20 by Bill Seymour.
+<br>
+All suggestions and corrections will be welcome; all flames will be amusing.
+Mail to was at pobox dot com.
+</address>
+</body>
+</html>
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tz-link.html
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tz-link.html
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tzfile.5
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tzfile.5
@@ -0,0 +1,496 @@
+.\" This file is in the public domain, so clarified as of
+.\" 1996-06-05 by Arthur David Olson.
+.TH TZFILE 5
+.SH NAME
+tzfile \- timezone information
+.SH DESCRIPTION
+.ie '\(lq'' .ds lq \&"\"
+.el .ds lq \(lq\"
+.ie '\(rq'' .ds rq \&"\"
+.el .ds rq \(rq\"
+.de q
+\\$3\*(lq\\$1\*(rq\\$2
+..
+.ie \n(.g .ds - \f(CR-\fP
+.el .ds - \-
+The timezone information files used by
+.BR tzset (3)
+are typically found under a directory with a name like
+.IR /usr/share/zoneinfo .
+These files use the format described in Internet RFC 8536.
+Each file is a sequence of 8-bit bytes.
+In a file, a binary integer is represented by a sequence of one or
+more bytes in network order (bigendian, or high-order byte first),
+with all bits significant,
+a signed binary integer is represented using two's complement,
+and a boolean is represented by a one-byte binary integer that is
+either 0 (false) or 1 (true).
+The format begins with a 44-byte header containing the following fields:
+.IP * 2
+The magic four-byte ASCII sequence
+.q "TZif"
+identifies the file as a timezone information file.
+.IP *
+A byte identifying the version of the file's format
+(as of 2021, either an ASCII NUL,
+.q "2",
+.q "3",
+or
+.q "4" ).
+.IP *
+Fifteen bytes containing zeros reserved for future use.
+.IP *
+Six four-byte integer values, in the following order:
+.RS
+.TP
+.B tzh_ttisutcnt
+The number of UT/local indicators stored in the file.
+(UT is Universal Time.)
+.TP
+.B tzh_ttisstdcnt
+The number of standard/wall indicators stored in the file.
+.TP
+.B tzh_leapcnt
+The number of leap seconds for which data entries are stored in the file.
+.TP
+.B tzh_timecnt
+The number of transition times for which data entries are stored
+in the file.
+.TP
+.B tzh_typecnt
+The number of local time types for which data entries are stored
+in the file (must not be zero).
+.TP
+.B tzh_charcnt
+The number of bytes of time zone abbreviation strings
+stored in the file.
+.RE
+.PP
+The above header is followed by the following fields, whose lengths
+depend on the contents of the header:
+.IP * 2
+.B tzh_timecnt
+four-byte signed integer values sorted in ascending order.
+These values are written in network byte order.
+Each is used as a transition time (as returned by
+.BR time (2))
+at which the rules for computing local time change.
+.IP *
+.B tzh_timecnt
+one-byte unsigned integer values;
+each one but the last tells which of the different types of local time types
+described in the file is associated with the time period
+starting with the same-indexed transition time
+and continuing up to but not including the next transition time.
+(The last time type is present only for consistency checking with the
+POSIX-style TZ string described below.)
+These values serve as indices into the next field.
+.IP *
+.B tzh_typecnt
+.B ttinfo
+entries, each defined as follows:
+.in +.5i
+.sp
+.nf
+.ta .5i +\w'unsigned char\0\0'u
+struct ttinfo {
+	int32_t	tt_utoff;
+	unsigned char	tt_isdst;
+	unsigned char	tt_desigidx;
+};
+.in -.5i
+.fi
+.sp
+Each structure is written as a four-byte signed integer value for
+.BR tt_utoff ,
+in network byte order, followed by a one-byte boolean for
+.B tt_isdst
+and a one-byte value for
+.BR tt_desigidx .
+In each structure,
+.B tt_utoff
+gives the number of seconds to be added to UT,
+.B tt_isdst
+tells whether
+.B tm_isdst
+should be set by
+.BR localtime (3)
+and
+.B tt_desigidx
+serves as an index into the array of time zone abbreviation bytes
+that follow the
+.B ttinfo
+entries in the file; if the designated string is "\*-00", the
+.B ttinfo
+entry is a placeholder indicating that local time is unspecified.
+The
+.B tt_utoff
+value is never equal to \-2**31, to let 32-bit clients negate it without
+overflow.
+Also, in realistic applications
+.B tt_utoff
+is in the range [\-89999, 93599] (i.e., more than \-25 hours and less
+than 26 hours); this allows easy support by implementations that
+already support the POSIX-required range [\-24:59:59, 25:59:59].
+.IP *
+.B tzh_charcnt
+bytes that represent time zone designations,
+which are null-terminated byte strings, each indexed by the
+.B tt_desigidx
+values mentioned above.
+The byte strings can overlap if one is a suffix of the other.
+The encoding of these strings is not specified.
+.IP *
+.B tzh_leapcnt
+pairs of four-byte values, written in network byte order;
+the first value of each pair gives the nonnegative time
+(as returned by
+.BR time (2))
+at which a leap second occurs or at which the leap second table expires;
+the second is a signed integer specifying the correction, which is the
+.I total
+number of leap seconds to be applied during the time period
+starting at the given time.
+The pairs of values are sorted in strictly ascending order by time.
+Each pair denotes one leap second, either positive or negative,
+except that if the last pair has the same correction as the previous one,
+the last pair denotes the leap second table's expiration time.
+Each leap second is at the end of a UTC calendar month.
+The first leap second has a nonnegative occurrence time,
+and is a positive leap second if and only if its correction is positive;
+the correction for each leap second after the first differs
+from the previous leap second by either 1 for a positive leap second,
+or \-1 for a negative leap second.
+If the leap second table is empty, the leap-second correction is zero
+for all timestamps;
+otherwise, for timestamps before the first occurrence time,
+the leap-second correction is zero if the first pair's correction is 1 or \-1,
+and is unspecified otherwise (which can happen only in files
+truncated at the start).
+.IP *
+.B tzh_ttisstdcnt
+standard/wall indicators, each stored as a one-byte boolean;
+they tell whether the transition times associated with local time types
+were specified as standard time or local (wall clock) time.
+.IP *
+.B tzh_ttisutcnt
+UT/local indicators, each stored as a one-byte boolean;
+they tell whether the transition times associated with local time types
+were specified as UT or local time.
+If a UT/local indicator is set, the corresponding standard/wall indicator
+must also be set.
+.PP
+The standard/wall and UT/local indicators were designed for
+transforming a TZif file's transition times into transitions appropriate
+for another time zone specified via a POSIX-style TZ string that lacks rules.
+For example, when TZ="EET\*-2EEST" and there is no TZif file "EET\*-2EEST",
+the idea was to adapt the transition times from a TZif file with the
+well-known name "posixrules" that is present only for this purpose and
+is a copy of the file "Europe/Brussels", a file with a different UT offset.
+POSIX does not specify this obsolete transformational behavior,
+the default rules are installation-dependent, and no implementation
+is known to support this feature for timestamps past 2037,
+so users desiring (say) Greek time should instead specify
+TZ="Europe/Athens" for better historical coverage, falling back on
+TZ="EET\*-2EEST,M3.5.0/3,M10.5.0/4" if POSIX conformance is required
+and older timestamps need not be handled accurately.
+.PP
+The
+.BR localtime (3)
+function
+normally uses the first
+.B ttinfo
+structure in the file
+if either
+.B tzh_timecnt
+is zero or the time argument is less than the first transition time recorded
+in the file.
+.SS Version 2 format
+For version-2-format timezone files,
+the above header and data are followed by a second header and data,
+identical in format except that
+eight bytes are used for each transition time or leap second time.
+(Leap second counts remain four bytes.)
+After the second header and data comes a newline-enclosed,
+POSIX-TZ-environment-variable-style string for use in handling instants
+after the last transition time stored in the file
+or for all instants if the file has no transitions.
+The POSIX-style TZ string is empty (i.e., nothing between the newlines)
+if there is no POSIX-style representation for such instants.
+If nonempty, the POSIX-style TZ string must agree with the local time
+type after the last transition time if present in the eight-byte data;
+for example, given the string
+.q "WET0WEST,M3.5.0,M10.5.0/3"
+then if a last transition time is in July, the transition's local time
+type must specify a daylight-saving time abbreviated
+.q "WEST"
+that is one hour east of UT.
+Also, if there is at least one transition, time type 0 is associated
+with the time period from the indefinite past up to but not including
+the earliest transition time.
+.SS Version 3 format
+For version-3-format timezone files, the POSIX-TZ-style string may
+use two minor extensions to the POSIX TZ format, as described in
+.BR newtzset (3).
+First, the hours part of its transition times may be signed and range from
+\-167 through 167 instead of the POSIX-required unsigned values
+from 0 through 24.
+Second, DST is in effect all year if it starts
+January 1 at 00:00 and ends December 31 at 24:00 plus the difference
+between daylight saving and standard time.
+.SS Version 4 format
+For version-4-format TZif files,
+the first leap second record can have a correction that is neither
+1 nor \-1, to represent truncation of the TZif file at the start.
+Also, if two or more leap second transitions are present and the last
+entry's correction equals the previous one, the last entry
+denotes the expiration of the leap second table instead of a leap second;
+timestamps after this expiration are unreliable in that future
+releases will likely add leap second entries after the expiration, and
+the added leap seconds will change how post-expiration timestamps are treated.
+.SS Interoperability considerations
+Future changes to the format may append more data.
+.PP
+Version 1 files are considered a legacy format and
+should not be generated, as they do not support transition
+times after the year 2038.
+Readers that understand only Version 1 must ignore
+any data that extends beyond the calculated end of the version
+1 data block.
+.PP
+Other than version 1, writers should generate
+the lowest version number needed by a file's data.
+For example, a writer should generate a version 4 file
+only if its leap second table either expires or is truncated at the start.
+Likewise, a writer not generating a version 4 file
+should generate a version 3 file only if
+TZ string extensions are necessary to accurately
+model transition times.
+.PP
+The sequence of time changes defined by the version 1
+header and data block should be a contiguous sub-sequence
+of the time changes defined by the version 2+ header and data
+block, and by the footer.
+This guideline helps obsolescent version 1 readers
+agree with current readers about timestamps within the
+contiguous sub-sequence.  It also lets writers not
+supporting obsolescent readers use a
+.B tzh_timecnt
+of zero
+in the version 1 data block to save space.
+.PP
+When a TZif file contains a leap second table expiration
+time, TZif readers should either refuse to process
+post-expiration timestamps, or process them as if the expiration
+time did not exist (possibly with an error indication).
+.PP
+Time zone designations should consist of at least three (3)
+and no more than six (6) ASCII characters from the set of
+alphanumerics,
+.q "\*-",
+and
+.q "+".
+This is for compatibility with POSIX requirements for
+time zone abbreviations.
+.PP
+When reading a version 2 or higher file, readers
+should ignore the version 1 header and data block except for
+the purpose of skipping over them.
+.PP
+Readers should calculate the total lengths of the
+headers and data blocks and check that they all fit within
+the actual file size, as part of a validity check for the file.
+.PP
+When a positive leap second occurs, readers should append an extra
+second to the local minute containing the second just before the leap
+second.  If this occurs when the UTC offset is not a multiple of 60
+seconds, the leap second occurs earlier than the last second of the
+local minute and the minute's remaining local seconds are numbered
+through 60 instead of the usual 59; the UTC offset is unaffected.
+.SS Common interoperability issues
+This section documents common problems in reading or writing TZif files.
+Most of these are problems in generating TZif files for use by
+older readers.
+The goals of this section are:
+.IP * 2
+to help TZif writers output files that avoid common
+pitfalls in older or buggy TZif readers,
+.IP *
+to help TZif readers avoid common pitfalls when reading
+files generated by future TZif writers, and
+.IP *
+to help any future specification authors see what sort of
+problems arise when the TZif format is changed.
+.PP
+When new versions of the TZif format have been defined, a
+design goal has been that a reader can successfully use a TZif
+file even if the file is of a later TZif version than what the
+reader was designed for.
+When complete compatibility was not achieved, an attempt was
+made to limit glitches to rarely used timestamps and allow
+simple partial workarounds in writers designed to generate
+new-version data useful even for older-version readers.
+This section attempts to document these compatibility issues and
+workarounds, as well as to document other common bugs in
+readers.
+.PP
+Interoperability problems with TZif include the following:
+.IP * 2
+Some readers examine only version 1 data.
+As a partial workaround, a writer can output as much version 1
+data as possible.
+However, a reader should ignore version 1 data, and should use
+version 2+ data even if the reader's native timestamps have only
+32 bits.
+.IP *
+Some readers designed for version 2 might mishandle
+timestamps after a version 3 or higher file's last transition, because
+they cannot parse extensions to POSIX in the TZ-like string.
+As a partial workaround, a writer can output more transitions
+than necessary, so that only far-future timestamps are
+mishandled by version 2 readers.
+.IP *
+Some readers designed for version 2 do not support
+permanent daylight saving time with transitions after 24:00
+\(en e.g., a TZ string
+.q "EST5EDT,0/0,J365/25"
+denoting permanent Eastern Daylight Time
+(\-04).
+As a workaround, a writer can substitute standard time
+for two time zones east, e.g.,
+.q "XXX3EDT4,0/0,J365/23"
+for a time zone with a never-used standard time (XXX, \-03)
+and negative daylight saving time (EDT, \-04) all year.
+Alternatively,
+as a partial workaround a writer can substitute standard time
+for the next time zone east \(en e.g.,
+.q "AST4"
+for permanent
+Atlantic Standard Time (\-04).
+.IP *
+Some readers designed for version 2 or 3, and that require strict
+conformance to RFC 8536, reject version 4 files whose leap second
+tables are truncated at the start or that end in expiration times.
+.IP *
+Some readers ignore the footer, and instead predict future
+timestamps from the time type of the last transition.
+As a partial workaround, a writer can output more transitions
+than necessary.
+.IP *
+Some readers do not use time type 0 for timestamps before
+the first transition, in that they infer a time type using a
+heuristic that does not always select time type 0.
+As a partial workaround, a writer can output a dummy (no-op)
+first transition at an early time.
+.IP *
+Some readers mishandle timestamps before the first
+transition that has a timestamp not less than \-2**31.
+Readers that support only 32-bit timestamps are likely to be
+more prone to this problem, for example, when they process
+64-bit transitions only some of which are representable in 32
+bits.
+As a partial workaround, a writer can output a dummy
+transition at timestamp \-2**31.
+.IP *
+Some readers mishandle a transition if its timestamp has
+the minimum possible signed 64-bit value.
+Timestamps less than \-2**59 are not recommended.
+.IP *
+Some readers mishandle POSIX-style TZ strings that
+contain
+.q "<"
+or
+.q ">".
+As a partial workaround, a writer can avoid using
+.q "<"
+or
+.q ">"
+for time zone abbreviations containing only alphabetic
+characters.
+.IP *
+Many readers mishandle time zone abbreviations that contain
+non-ASCII characters.
+These characters are not recommended.
+.IP *
+Some readers may mishandle time zone abbreviations that
+contain fewer than 3 or more than 6 characters, or that
+contain ASCII characters other than alphanumerics,
+.q "\*-",
+and
+.q "+".
+These abbreviations are not recommended.
+.IP *
+Some readers mishandle TZif files that specify
+daylight-saving time UT offsets that are less than the UT
+offsets for the corresponding standard time.
+These readers do not support locations like Ireland, which
+uses the equivalent of the POSIX TZ string
+.q "IST\*-1GMT0,M10.5.0,M3.5.0/1",
+observing standard time
+(IST, +01) in summer and daylight saving time (GMT, +00) in winter.
+As a partial workaround, a writer can output data for the
+equivalent of the POSIX TZ string
+.q "GMT0IST,M3.5.0/1,M10.5.0",
+thus swapping standard and daylight saving time.
+Although this workaround misidentifies which part of the year
+uses daylight saving time, it records UT offsets and time zone
+abbreviations correctly.
+.IP *
+Some readers generate ambiguous timestamps for positive leap seconds
+that occur when the UTC offset is not a multiple of 60 seconds.
+For example, in a timezone with UTC offset +01:23:45 and with
+a positive leap second 78796801 (1972-06-30 23:59:60 UTC), some readers will
+map both 78796800 and 78796801 to 01:23:45 local time the next day
+instead of mapping the latter to 01:23:46, and they will map 78796815 to
+01:23:59 instead of to 01:23:60.
+This has not yet been a practical problem, since no civil authority
+has observed such UTC offsets since leap seconds were
+introduced in 1972.
+.PP
+Some interoperability problems are reader bugs that
+are listed here mostly as warnings to developers of readers.
+.IP * 2
+Some readers do not support negative timestamps.
+Developers of distributed applications should keep this
+in mind if they need to deal with pre-1970 data.
+.IP *
+Some readers mishandle timestamps before the first
+transition that has a nonnegative timestamp.
+Readers that do not support negative timestamps are likely to
+be more prone to this problem.
+.IP *
+Some readers mishandle time zone abbreviations like
+.q "\*-08"
+that contain
+.q "+",
+.q "\*-",
+or digits.
+.IP *
+Some readers mishandle UT offsets that are out of the
+traditional range of \-12 through +12 hours, and so do not
+support locations like Kiritimati that are outside this
+range.
+.IP *
+Some readers mishandle UT offsets in the range [\-3599, \-1]
+seconds from UT, because they integer-divide the offset by
+3600 to get 0 and then display the hour part as
+.q "+00".
+.IP *
+Some readers mishandle UT offsets that are not a multiple
+of one hour, or of 15 minutes, or of 1 minute.
+.SH SEE ALSO
+.BR time (2),
+.BR localtime (3),
+.BR tzset (3),
+.BR tzselect (8),
+.BR zdump (8),
+.BR zic (8).
+.PP
+Olson A, Eggert P, Murchison K. The Time Zone Information Format (TZif).
+2019 Feb.
+.UR https://\:datatracker.ietf.org/\:doc/\:html/\:rfc8536
+Internet RFC 8536
+.UE
+.UR https://\:doi.org/\:10.17487/\:RFC8536
+doi:10.17487/RFC8536
+.UE .
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tzfile.h
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tzfile.h
@@ -0,0 +1,123 @@
+/* Layout and location of TZif files.  */
+
+#ifndef TZFILE_H
+
+#define TZFILE_H
+
+/*
+** This file is in the public domain, so clarified as of
+** 1996-06-05 by Arthur David Olson.
+*/
+
+/*
+** This header is for use ONLY with the time conversion code.
+** There is no guarantee that it will remain unchanged,
+** or that it will remain at all.
+** Do NOT copy it to any system include directory.
+** Thank you!
+*/
+
+/*
+** Information about time zone files.
+*/
+
+#ifndef TZDIR
+# define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */
+#endif /* !defined TZDIR */
+
+#ifndef TZDEFAULT
+# define TZDEFAULT "/etc/localtime"
+#endif /* !defined TZDEFAULT */
+
+#ifndef TZDEFRULES
+# define TZDEFRULES "posixrules"
+#endif /* !defined TZDEFRULES */
+
+
+/* See Internet RFC 8536 for more details about the following format.  */
+
+/*
+** Each file begins with. . .
+*/
+
+#define	TZ_MAGIC	"TZif"
+
+struct tzhead {
+	char	tzh_magic[4];		/* TZ_MAGIC */
+	char	tzh_version[1];		/* '\0' or '2'-'4' as of 2021 */
+	char	tzh_reserved[15];	/* reserved; must be zero */
+	char	tzh_ttisutcnt[4];	/* coded number of trans. time flags */
+	char	tzh_ttisstdcnt[4];	/* coded number of trans. time flags */
+	char	tzh_leapcnt[4];		/* coded number of leap seconds */
+	char	tzh_timecnt[4];		/* coded number of transition times */
+	char	tzh_typecnt[4];		/* coded number of local time types */
+	char	tzh_charcnt[4];		/* coded number of abbr. chars */
+};
+
+/*
+** . . .followed by. . .
+**
+**	tzh_timecnt (char [4])s		coded transition times a la time(2)
+**	tzh_timecnt (unsigned char)s	types of local time starting at above
+**	tzh_typecnt repetitions of
+**		one (char [4])		coded UT offset in seconds
+**		one (unsigned char)	used to set tm_isdst
+**		one (unsigned char)	that's an abbreviation list index
+**	tzh_charcnt (char)s		'\0'-terminated zone abbreviations
+**	tzh_leapcnt repetitions of
+**		one (char [4])		coded leap second transition times
+**		one (char [4])		total correction after above
+**	tzh_ttisstdcnt (char)s		indexed by type; if 1, transition
+**					time is standard time, if 0,
+**					transition time is local (wall clock)
+**					time; if absent, transition times are
+**					assumed to be local time
+**	tzh_ttisutcnt (char)s		indexed by type; if 1, transition
+**					time is UT, if 0, transition time is
+**					local time; if absent, transition
+**					times are assumed to be local time.
+**					When this is 1, the corresponding
+**					std/wall indicator must also be 1.
+*/
+
+/*
+** If tzh_version is '2' or greater, the above is followed by a second instance
+** of tzhead and a second instance of the data in which each coded transition
+** time uses 8 rather than 4 chars,
+** then a POSIX-TZ-environment-variable-style string for use in handling
+** instants after the last transition time stored in the file
+** (with nothing between the newlines if there is no POSIX representation for
+** such instants).
+**
+** If tz_version is '3' or greater, the above is extended as follows.
+** First, the POSIX TZ string's hour offset may range from -167
+** through 167 as compared to the POSIX-required 0 through 24.
+** Second, its DST start time may be January 1 at 00:00 and its stop
+** time December 31 at 24:00 plus the difference between DST and
+** standard time, indicating DST all year.
+*/
+
+/*
+** In the current implementation, "tzset()" refuses to deal with files that
+** exceed any of the limits below.
+*/
+
+#ifndef TZ_MAX_TIMES
+# define TZ_MAX_TIMES 2000
+#endif /* !defined TZ_MAX_TIMES */
+
+#ifndef TZ_MAX_TYPES
+/* This must be at least 17 for Europe/Samara and Europe/Vilnius.  */
+# define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
+#endif /* !defined TZ_MAX_TYPES */
+
+#ifndef TZ_MAX_CHARS
+# define TZ_MAX_CHARS 50	/* Maximum number of abbreviation characters */
+				/* (limited by what unsigned chars can hold) */
+#endif /* !defined TZ_MAX_CHARS */
+
+#ifndef TZ_MAX_LEAPS
+# define TZ_MAX_LEAPS 50	/* Maximum number of leap second corrections */
+#endif /* !defined TZ_MAX_LEAPS */
+
+#endif /* !defined TZFILE_H */
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tzselect.8
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tzselect.8
@@ -0,0 +1,125 @@
+.\" This file is in the public domain, so clarified as of
+.\" 2009-05-17 by Arthur David Olson.
+.TH TZSELECT 8
+.SH NAME
+tzselect \- select a timezone
+.SH SYNOPSIS
+.ie \n(.g .ds - \f(CR-\fP
+.el .ds - \-
+.ds d " degrees
+.ds m " minutes
+.ds s " seconds
+.ds _ " \&
+.if t \{\
+. if \n(.g .if c \(de .if c \(fm .if c \(sd \{\
+.  ds d \(de
+.  ds m \(fm
+.  ds s \(sd
+.  ds _ \|
+. \}
+.\}
+.B tzselect
+[
+.B \*-c
+.I coord
+] [
+.B \*-n
+.I limit
+] [
+.B \*-\*-help
+] [
+.B \*-\*-version
+]
+.SH DESCRIPTION
+The
+.B tzselect
+program asks the user for information about the current location,
+and outputs the resulting timezone to standard output.
+The output is suitable as a value for the TZ environment variable.
+.PP
+All interaction with the user is done via standard input and standard error.
+.SH OPTIONS
+.TP
+.BI "\*-c " coord
+Instead of asking for continent and then country and then city,
+ask for selection from time zones whose largest cities
+are closest to the location with geographical coordinates
+.I coord.
+Use ISO 6709 notation for
+.I coord,
+that is, a latitude immediately followed by a longitude.  The latitude
+and longitude should be signed integers followed by an optional
+decimal point and fraction: positive numbers represent north and east,
+negative south and west.  Latitudes with two and longitudes with three
+integer digits are treated as degrees; latitudes with four or six and
+longitudes with five or seven integer digits are treated as
+.I "DDMM, DDDMM, DDMMSS,"
+or
+.I DDDMMSS
+representing
+.I DD
+or
+.I DDD
+degrees,
+.I MM
+minutes,
+and zero or
+.I SS
+seconds, with any trailing fractions represent fractional minutes or
+(if
+.I SS
+is present) seconds.  The decimal point is that of the current locale.
+For example, in the (default) C locale,
+.B "\*-c\ +40.689\*-074.045"
+specifies 40.689\*d\*_N, 74.045\*d\*_W,
+.B "\*-c\ +4041.4\*-07402.7"
+specifies 40\*d\*_41.4\*m\*_N, 74\*d\*_2.7\*m\*_W, and
+.B "\*-c\ +404121\*-0740240"
+specifies 40\*d\*_41\*m\*_21\*s\*_N, 74\*d\*_2\*m\*_40\*s\*_W.
+If
+.I coord
+is not one of the documented forms, the resulting behavior is unspecified.
+.TP
+.BI "\*-n " limit
+When
+.B \*-c
+is used, display the closest
+.I limit
+locations (default 10).
+.TP
+.B "\*-\*-help"
+Output help information and exit.
+.TP
+.B "\*-\*-version"
+Output version information and exit.
+.SH "ENVIRONMENT VARIABLES"
+.TP
+\f3AWK\fP
+Name of a Posix-compliant
+.B awk
+program (default:
+.BR awk ).
+.TP
+\f3TZDIR\fP
+Name of the directory containing timezone data files (default:
+.BR /usr/share/zoneinfo ).
+.SH FILES
+.TP
+\f2TZDIR\fP\f3/iso3166.tab\fP
+Table of ISO 3166 2-letter country codes and country names.
+.TP
+\f2TZDIR\fP\f3/zone1970.tab\fP
+Table of country codes, latitude and longitude, timezones, and
+descriptive comments.
+.TP
+\f2TZDIR\fP\f3/\fP\f2TZ\fP
+Timezone data file for timezone \f2TZ\fP.
+.SH "EXIT STATUS"
+The exit status is zero if a timezone was successfully obtained from the user,
+nonzero otherwise.
+.SH "SEE ALSO"
+newctime(3), tzfile(5), zdump(8), zic(8)
+.SH NOTES
+Applications should not assume that
+.BR tzselect 's
+output matches the user's political preferences.
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tzselect.ksh
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/tzselect.ksh
@@ -0,0 +1,586 @@
+#!/bin/bash
+# Ask the user about the time zone, and output the resulting TZ value to stdout.
+# Interact with the user via stderr and stdin.
+
+PKGVERSION='(tzcode) '
+TZVERSION=see_Makefile
+REPORT_BUGS_TO=tz@iana.org
+
+# Contributed by Paul Eggert.  This file is in the public domain.
+
+# Porting notes:
+#
+# This script requires a Posix-like shell and prefers the extension of a
+# 'select' statement.  The 'select' statement was introduced in the
+# Korn shell and is available in Bash and other shell implementations.
+# If your host lacks both Bash and the Korn shell, you can get their
+# source from one of these locations:
+#
+#	Bash <https://www.gnu.org/software/bash/>
+#	Korn Shell <http://www.kornshell.com/>
+#	MirBSD Korn Shell <http://www.mirbsd.org/mksh.htm>
+#
+# For portability to Solaris 10 /bin/sh (supported by Oracle through
+# January 2024) this script avoids some POSIX features and common
+# extensions, such as $(...) (which works sometimes but not others),
+# $((...)), ! CMD, ${#ID}, ${ID##PAT}, ${ID%%PAT}, and $10.
+
+#
+# This script also uses several features of modern awk programs.
+# If your host lacks awk, or has an old awk that does not conform to Posix,
+# you can use either of the following free programs instead:
+#
+#	Gawk (GNU awk) <https://www.gnu.org/software/gawk/>
+#	mawk <https://invisible-island.net/mawk/>
+#	nawk <https://github.com/onetrueawk/awk>
+
+
+# Specify default values for environment variables if they are unset.
+: ${AWK=awk}
+: ${TZDIR=`pwd`}
+
+# Output one argument as-is to standard output.
+# Safer than 'echo', which can mishandle '\' or leading '-'.
+say() {
+    printf '%s\n' "$1"
+}
+
+# Check for awk Posix compliance.
+($AWK -v x=y 'BEGIN { exit 123 }') </dev/null >/dev/null 2>&1
+[ $? = 123 ] || {
+	say >&2 "$0: Sorry, your '$AWK' program is not Posix compatible."
+	exit 1
+}
+
+coord=
+location_limit=10
+zonetabtype=zone1970
+
+usage="Usage: tzselect [--version] [--help] [-c COORD] [-n LIMIT]
+Select a timezone interactively.
+
+Options:
+
+  -c COORD
+    Instead of asking for continent and then country and then city,
+    ask for selection from time zones whose largest cities
+    are closest to the location with geographical coordinates COORD.
+    COORD should use ISO 6709 notation, for example, '-c +4852+00220'
+    for Paris (in degrees and minutes, North and East), or
+    '-c -35-058' for Buenos Aires (in degrees, South and West).
+
+  -n LIMIT
+    Display at most LIMIT locations when -c is used (default $location_limit).
+
+  --version
+    Output version information.
+
+  --help
+    Output this help.
+
+Report bugs to $REPORT_BUGS_TO."
+
+# Ask the user to select from the function's arguments,
+# and assign the selected argument to the variable 'select_result'.
+# Exit on EOF or I/O error.  Use the shell's 'select' builtin if available,
+# falling back on a less-nice but portable substitute otherwise.
+if
+  case $BASH_VERSION in
+  ?*) : ;;
+  '')
+    # '; exit' should be redundant, but Dash doesn't properly fail without it.
+    (eval 'set --; select x; do break; done; exit') </dev/null 2>/dev/null
+  esac
+then
+  # Do this inside 'eval', as otherwise the shell might exit when parsing it
+  # even though it is never executed.
+  eval '
+    doselect() {
+      select select_result
+      do
+	case $select_result in
+	"") echo >&2 "Please enter a number in range." ;;
+	?*) break
+	esac
+      done || exit
+    }
+  '
+else
+  doselect() {
+    # Field width of the prompt numbers.
+    select_width=`expr $# : '.*'`
+
+    select_i=
+
+    while :
+    do
+      case $select_i in
+      '')
+	select_i=0
+	for select_word
+	do
+	  select_i=`expr $select_i + 1`
+	  printf >&2 "%${select_width}d) %s\\n" $select_i "$select_word"
+	done ;;
+      *[!0-9]*)
+	echo >&2 'Please enter a number in range.' ;;
+      *)
+	if test 1 -le $select_i && test $select_i -le $#; then
+	  shift `expr $select_i - 1`
+	  select_result=$1
+	  break
+	fi
+	echo >&2 'Please enter a number in range.'
+      esac
+
+      # Prompt and read input.
+      printf >&2 %s "${PS3-#? }"
+      read select_i || exit
+    done
+  }
+fi
+
+while getopts c:n:t:-: opt
+do
+    case $opt$OPTARG in
+    c*)
+	coord=$OPTARG ;;
+    n*)
+	location_limit=$OPTARG ;;
+    t*) # Undocumented option, used for developer testing.
+	zonetabtype=$OPTARG ;;
+    -help)
+	exec echo "$usage" ;;
+    -version)
+	exec echo "tzselect $PKGVERSION$TZVERSION" ;;
+    -*)
+	say >&2 "$0: -$opt$OPTARG: unknown option; try '$0 --help'"; exit 1 ;;
+    *)
+	say >&2 "$0: try '$0 --help'"; exit 1 ;;
+    esac
+done
+
+shift `expr $OPTIND - 1`
+case $# in
+0) ;;
+*) say >&2 "$0: $1: unknown argument"; exit 1 ;;
+esac
+
+# Make sure the tables are readable.
+TZ_COUNTRY_TABLE=$TZDIR/iso3166.tab
+TZ_ZONE_TABLE=$TZDIR/$zonetabtype.tab
+for f in $TZ_COUNTRY_TABLE $TZ_ZONE_TABLE
+do
+	<"$f" || {
+		say >&2 "$0: time zone files are not set up correctly"
+		exit 1
+	}
+done
+
+# If the current locale does not support UTF-8, convert data to current
+# locale's format if possible, as the shell aligns columns better that way.
+# Check the UTF-8 of U+12345 CUNEIFORM SIGN URU TIMES KI.
+$AWK 'BEGIN { u12345 = "\360\222\215\205"; exit length(u12345) != 1 }' || {
+    { tmp=`(mktemp -d) 2>/dev/null` || {
+	tmp=${TMPDIR-/tmp}/tzselect.$$ &&
+	(umask 77 && mkdir -- "$tmp")
+    };} &&
+    trap 'status=$?; rm -fr -- "$tmp"; exit $status' 0 HUP INT PIPE TERM &&
+    (iconv -f UTF-8 -t //TRANSLIT <"$TZ_COUNTRY_TABLE" >$tmp/iso3166.tab) \
+        2>/dev/null &&
+    TZ_COUNTRY_TABLE=$tmp/iso3166.tab &&
+    iconv -f UTF-8 -t //TRANSLIT <"$TZ_ZONE_TABLE" >$tmp/$zonetabtype.tab &&
+    TZ_ZONE_TABLE=$tmp/$zonetabtype.tab
+}
+
+newline='
+'
+IFS=$newline
+
+
+# Awk script to read a time zone table and output the same table,
+# with each column preceded by its distance from 'here'.
+output_distances='
+  BEGIN {
+    FS = "\t"
+    while (getline <TZ_COUNTRY_TABLE)
+      if ($0 ~ /^[^#]/)
+        country[$1] = $2
+    country["US"] = "US" # Otherwise the strings get too long.
+  }
+  function abs(x) {
+    return x < 0 ? -x : x;
+  }
+  function min(x, y) {
+    return x < y ? x : y;
+  }
+  function convert_coord(coord, deg, minute, ilen, sign, sec) {
+    if (coord ~ /^[-+]?[0-9]?[0-9][0-9][0-9][0-9][0-9][0-9]([^0-9]|$)/) {
+      degminsec = coord
+      intdeg = degminsec < 0 ? -int(-degminsec / 10000) : int(degminsec / 10000)
+      minsec = degminsec - intdeg * 10000
+      intmin = minsec < 0 ? -int(-minsec / 100) : int(minsec / 100)
+      sec = minsec - intmin * 100
+      deg = (intdeg * 3600 + intmin * 60 + sec) / 3600
+    } else if (coord ~ /^[-+]?[0-9]?[0-9][0-9][0-9][0-9]([^0-9]|$)/) {
+      degmin = coord
+      intdeg = degmin < 0 ? -int(-degmin / 100) : int(degmin / 100)
+      minute = degmin - intdeg * 100
+      deg = (intdeg * 60 + minute) / 60
+    } else
+      deg = coord
+    return deg * 0.017453292519943296
+  }
+  function convert_latitude(coord) {
+    match(coord, /..*[-+]/)
+    return convert_coord(substr(coord, 1, RLENGTH - 1))
+  }
+  function convert_longitude(coord) {
+    match(coord, /..*[-+]/)
+    return convert_coord(substr(coord, RLENGTH))
+  }
+  # Great-circle distance between points with given latitude and longitude.
+  # Inputs and output are in radians.  This uses the great-circle special
+  # case of the Vicenty formula for distances on ellipsoids.
+  function gcdist(lat1, long1, lat2, long2, dlong, x, y, num, denom) {
+    dlong = long2 - long1
+    x = cos(lat2) * sin(dlong)
+    y = cos(lat1) * sin(lat2) - sin(lat1) * cos(lat2) * cos(dlong)
+    num = sqrt(x * x + y * y)
+    denom = sin(lat1) * sin(lat2) + cos(lat1) * cos(lat2) * cos(dlong)
+    return atan2(num, denom)
+  }
+  # Parallel distance between points with given latitude and longitude.
+  # This is the product of the longitude difference and the cosine
+  # of the latitude of the point that is further from the equator.
+  # I.e., it considers longitudes to be further apart if they are
+  # nearer the equator.
+  function pardist(lat1, long1, lat2, long2) {
+    return abs(long1 - long2) * min(cos(lat1), cos(lat2))
+  }
+  # The distance function is the sum of the great-circle distance and
+  # the parallel distance.  It could be weighted.
+  function dist(lat1, long1, lat2, long2) {
+    return gcdist(lat1, long1, lat2, long2) + pardist(lat1, long1, lat2, long2)
+  }
+  BEGIN {
+    coord_lat = convert_latitude(coord)
+    coord_long = convert_longitude(coord)
+  }
+  /^[^#]/ {
+    here_lat = convert_latitude($2)
+    here_long = convert_longitude($2)
+    line = $1 "\t" $2 "\t" $3
+    sep = "\t"
+    ncc = split($1, cc, /,/)
+    for (i = 1; i <= ncc; i++) {
+      line = line sep country[cc[i]]
+      sep = ", "
+    }
+    if (NF == 4)
+      line = line " - " $4
+    printf "%g\t%s\n", dist(coord_lat, coord_long, here_lat, here_long), line
+  }
+'
+
+# Begin the main loop.  We come back here if the user wants to retry.
+while
+
+	echo >&2 'Please identify a location' \
+		'so that time zone rules can be set correctly.'
+
+	continent=
+	country=
+	region=
+
+	case $coord in
+	?*)
+		continent=coord;;
+	'')
+
+	# Ask the user for continent or ocean.
+
+	echo >&2 'Please select a continent, ocean, "coord", or "TZ".'
+
+        quoted_continents=`
+	  $AWK '
+	    function handle_entry(entry) {
+	      entry = substr(entry, 1, index(entry, "/") - 1)
+	      if (entry == "America")
+	       entry = entry "s"
+	      if (entry ~ /^(Arctic|Atlantic|Indian|Pacific)$/)
+	       entry = entry " Ocean"
+	      printf "'\''%s'\''\n", entry
+	    }
+	    BEGIN { FS = "\t" }
+	    /^[^#]/ {
+              handle_entry($3)
+            }
+	    /^#@/ {
+	      ncont = split($2, cont, /,/)
+	      for (ci = 1; ci <= ncont; ci++) {
+	        handle_entry(cont[ci])
+	      }
+	    }
+          ' <"$TZ_ZONE_TABLE" |
+	  sort -u |
+	  tr '\n' ' '
+	  echo ''
+	`
+
+	eval '
+	    doselect '"$quoted_continents"' \
+		"coord - I want to use geographical coordinates." \
+		"TZ - I want to specify the timezone using the Posix TZ format."
+	    continent=$select_result
+	    case $continent in
+	    Americas) continent=America;;
+	    *" "*) continent=`expr "$continent" : '\''\([^ ]*\)'\''`
+	    esac
+	'
+	esac
+
+	case $continent in
+	TZ)
+		# Ask the user for a Posix TZ string.  Check that it conforms.
+		while
+			echo >&2 'Please enter the desired value' \
+				'of the TZ environment variable.'
+			echo >&2 'For example, AEST-10 is abbreviated' \
+				'AEST and is 10 hours'
+			echo >&2 'ahead (east) of Greenwich,' \
+				'with no daylight saving time.'
+			read TZ
+			$AWK -v TZ="$TZ" 'BEGIN {
+				tzname = "(<[[:alnum:]+-]{3,}>|[[:alpha:]]{3,})"
+				time = "(2[0-4]|[0-1]?[0-9])" \
+				  "(:[0-5][0-9](:[0-5][0-9])?)?"
+				offset = "[-+]?" time
+				mdate = "M([1-9]|1[0-2])\\.[1-5]\\.[0-6]"
+				jdate = "((J[1-9]|[0-9]|J?[1-9][0-9]" \
+				  "|J?[1-2][0-9][0-9])|J?3[0-5][0-9]|J?36[0-5])"
+				datetime = ",(" mdate "|" jdate ")(/" time ")?"
+				tzpattern = "^(:.*|" tzname offset "(" tzname \
+				  "(" offset ")?(" datetime datetime ")?)?)$"
+				if (TZ ~ tzpattern) exit 1
+				exit 0
+			}'
+		do
+		    say >&2 "'$TZ' is not a conforming Posix timezone string."
+		done
+		TZ_for_date=$TZ;;
+	*)
+		case $continent in
+		coord)
+		    case $coord in
+		    '')
+			echo >&2 'Please enter coordinates' \
+				'in ISO 6709 notation.'
+			echo >&2 'For example, +4042-07403 stands for'
+			echo >&2 '40 degrees 42 minutes north,' \
+				'74 degrees 3 minutes west.'
+			read coord;;
+		    esac
+		    distance_table=`$AWK \
+			    -v coord="$coord" \
+			    -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
+			    "$output_distances" <"$TZ_ZONE_TABLE" |
+		      sort -n |
+		      sed "${location_limit}q"
+		    `
+		    regions=`say "$distance_table" | $AWK '
+		      BEGIN { FS = "\t" }
+		      { print $NF }
+		    '`
+		    echo >&2 'Please select one of the following timezones,' \
+		    echo >&2 'listed roughly in increasing order' \
+			    "of distance from $coord".
+		    doselect $regions
+		    region=$select_result
+		    TZ=`say "$distance_table" | $AWK -v region="$region" '
+		      BEGIN { FS="\t" }
+		      $NF == region { print $4 }
+		    '`
+		    ;;
+		*)
+		# Get list of names of countries in the continent or ocean.
+		countries=`$AWK \
+			-v continent_re="^$continent/" \
+			-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
+		'
+			BEGIN { FS = "\t" }
+			/^#$/ { next }
+			/^#[^@]/ { next }
+			{
+			  commentary = $0 ~ /^#@/
+			  if (commentary) {
+			    col1ccs = substr($1, 3)
+			    conts = $2
+			  } else {
+			    col1ccs = $1
+			    conts = $3
+			  }
+			  ncc = split(col1ccs, cc, /,/)
+			  ncont = split(conts, cont, /,/)
+			  for (i = 1; i <= ncc; i++) {
+			    elsewhere = commentary
+			    for (ci = 1; ci <= ncont; ci++) {
+			      if (cont[ci] ~ continent_re) {
+				if (!cc_seen[cc[i]]++) cc_list[++ccs] = cc[i]
+				elsewhere = 0
+			      }
+			    }
+			    if (elsewhere) {
+			      for (i = 1; i <= ncc; i++) {
+			        cc_elsewhere[cc[i]] = 1
+			      }
+			    }
+			  }
+			}
+			END {
+				while (getline <TZ_COUNTRY_TABLE) {
+					if ($0 !~ /^#/) cc_name[$1] = $2
+				}
+				for (i = 1; i <= ccs; i++) {
+					country = cc_list[i]
+					if (cc_elsewhere[country]) continue
+					if (cc_name[country]) {
+					  country = cc_name[country]
+					}
+					print country
+				}
+			}
+		' <"$TZ_ZONE_TABLE" | sort -f`
+
+
+		# If there's more than one country, ask the user which one.
+		case $countries in
+		*"$newline"*)
+			echo >&2 'Please select a country' \
+				'whose clocks agree with yours.'
+			doselect $countries
+			country=$select_result;;
+		*)
+			country=$countries
+		esac
+
+
+		# Get list of timezones in the country.
+		regions=`$AWK \
+			-v country="$country" \
+			-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
+		'
+			BEGIN {
+				FS = "\t"
+				cc = country
+				while (getline <TZ_COUNTRY_TABLE) {
+					if ($0 !~ /^#/  &&  country == $2) {
+						cc = $1
+						break
+					}
+				}
+			}
+			/^#/ { next }
+			$1 ~ cc { print $4 }
+		' <"$TZ_ZONE_TABLE"`
+
+
+		# If there's more than one region, ask the user which one.
+		case $regions in
+		*"$newline"*)
+			echo >&2 'Please select one of the following timezones.'
+			doselect $regions
+			region=$select_result;;
+		*)
+			region=$regions
+		esac
+
+		# Determine TZ from country and region.
+		TZ=`$AWK \
+			-v country="$country" \
+			-v region="$region" \
+			-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
+		'
+			BEGIN {
+				FS = "\t"
+				cc = country
+				while (getline <TZ_COUNTRY_TABLE) {
+					if ($0 !~ /^#/  &&  country == $2) {
+						cc = $1
+						break
+					}
+				}
+			}
+			/^#/ { next }
+			$1 ~ cc && $4 == region { print $3 }
+		' <"$TZ_ZONE_TABLE"`
+		esac
+
+		# Make sure the corresponding zoneinfo file exists.
+		TZ_for_date=$TZDIR/$TZ
+		<"$TZ_for_date" || {
+			say >&2 "$0: time zone files are not set up correctly"
+			exit 1
+		}
+	esac
+
+
+	# Use the proposed TZ to output the current date relative to UTC.
+	# Loop until they agree in seconds.
+	# Give up after 8 unsuccessful tries.
+
+	extra_info=
+	for i in 1 2 3 4 5 6 7 8
+	do
+		TZdate=`LANG=C TZ="$TZ_for_date" date`
+		UTdate=`LANG=C TZ=UTC0 date`
+		TZsec=`expr "$TZdate" : '.*:\([0-5][0-9]\)'`
+		UTsec=`expr "$UTdate" : '.*:\([0-5][0-9]\)'`
+		case $TZsec in
+		$UTsec)
+			extra_info="
+Selected time is now:	$TZdate.
+Universal Time is now:	$UTdate."
+			break
+		esac
+	done
+
+
+	# Output TZ info and ask the user to confirm.
+
+	echo >&2 ""
+	echo >&2 "The following information has been given:"
+	echo >&2 ""
+	case $country%$region%$coord in
+	?*%?*%)	say >&2 "	$country$newline	$region";;
+	?*%%)	say >&2 "	$country";;
+	%?*%?*) say >&2 "	coord $coord$newline	$region";;
+	%%?*)	say >&2 "	coord $coord";;
+	*)	say >&2 "	TZ='$TZ'"
+	esac
+	say >&2 ""
+	say >&2 "Therefore TZ='$TZ' will be used.$extra_info"
+	say >&2 "Is the above information OK?"
+
+	doselect Yes No
+	ok=$select_result
+	case $ok in
+	Yes) break
+	esac
+do coord=
+done
+
+case $SHELL in
+*csh) file=.login line="setenv TZ '$TZ'";;
+*) file=.profile line="TZ='$TZ'; export TZ"
+esac
+
+test -t 1 && say >&2 "
+You can make this change permanent for yourself by appending the line
+	$line
+to the file '$file' in your home directory; then log out and log in again.
+
+Here is that TZ value again, this time on standard output so that you
+can use the $0 command in shell scripts:"
+
+say "$TZ"
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/workman.sh
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/workman.sh
@@ -0,0 +1,41 @@
+#! /bin/sh
+# Convert manual page troff stdin to formatted .txt stdout.
+
+# This file is in the public domain, so clarified as of
+# 2009-05-17 by Arthur David Olson.
+
+if (type nroff && type perl) >/dev/null 2>&1; then
+
+  # Tell groff not to emit SGR escape sequences (ANSI color escapes).
+  GROFF_NO_SGR=1
+  export GROFF_NO_SGR
+
+  echo ".am TH
+.hy 0
+.na
+..
+.rm }H
+.rm }F" | nroff -man - ${1+"$@"} | perl -ne '
+	binmode STDIN, '\'':encoding(utf8)'\'';
+	binmode STDOUT, '\'':encoding(utf8)'\'';
+	chomp;
+	s/.\010//g;
+	s/\s*$//;
+	if (/^$/) {
+		$sawblank = 1;
+		next;
+	} else {
+		if ($sawblank && $didprint) {
+			print "\n";
+			$sawblank = 0;
+		}
+		print "$_\n";
+		$didprint = 1;
+	}
+  '
+elif (type mandoc && type col) >/dev/null 2>&1; then
+  mandoc -man -T ascii "$@" | col -bx
+else
+  echo >&2 "$0: please install nroff and perl, or mandoc and col"
+  exit 1
+fi
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zdump.8
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zdump.8
@@ -0,0 +1,231 @@
+.\" This file is in the public domain, so clarified as of
+.\" 2009-05-17 by Arthur David Olson.
+.TH zdump 8
+.SH NAME
+zdump \- timezone dumper
+.SH SYNOPSIS
+.B zdump
+[
+.I option
+\&... ] [
+.I timezone
+\&... ]
+.SH DESCRIPTION
+.ie '\(lq'' .ds lq \&"\"
+.el .ds lq \(lq\"
+.ie '\(rq'' .ds rq \&"\"
+.el .ds rq \(rq\"
+.de q
+\\$3\*(lq\\$1\*(rq\\$2
+..
+.ie \n(.g .ds - \f(CR-\fP
+.el .ds - \-
+The
+.B zdump
+program prints the current time in each
+.I timezone
+named on the command line.
+.SH OPTIONS
+.TP
+.B \*-\*-version
+Output version information and exit.
+.TP
+.B \*-\*-help
+Output short usage message and exit.
+.TP
+.B \*-i
+Output a description of time intervals.  For each
+.I timezone
+on the command line, output an interval-format description of the
+timezone.  See
+.q "INTERVAL FORMAT"
+below.
+.TP
+.B \*-v
+Output a verbose description of time intervals.
+For each
+.I timezone
+on the command line,
+print the times at the two extreme time values,
+the times (if present) at and just beyond the boundaries of years that
+.BR localtime (3)
+and
+.BR gmtime (3)
+can represent, and
+the times both one second before and exactly at
+each detected time discontinuity.
+Each line is followed by
+.BI isdst= D
+where
+.I D
+is positive, zero, or negative depending on whether
+the given time is daylight saving time, standard time,
+or an unknown time type, respectively.
+Each line is also followed by
+.BI gmtoff= N
+if the given local time is known to be
+.I N
+seconds east of Greenwich.
+.TP
+.B \*-V
+Like
+.BR \*-v ,
+except omit output concerning extreme time and year values.
+This generates output that is easier to compare to that of
+implementations with different time representations.
+.TP
+.BI "\*-c " \fR[\fIloyear , \fR]\fIhiyear
+Cut off interval output at the given year(s).
+Cutoff times are computed using the proleptic Gregorian calendar with year 0
+and with Universal Time (UT) ignoring leap seconds.
+Cutoffs are at the start of each year, where the lower-bound
+timestamp is inclusive and the upper is exclusive; for example,
+.B "\*-c 1970,2070"
+selects transitions on or after 1970-01-01 00:00:00 UTC
+and before 2070-01-01 00:00:00 UTC.
+The default cutoff is
+.BR \*-500,2500 .
+.TP
+.BI "\*-t " \fR[\fIlotime , \fR]\fIhitime
+Cut off interval output at the given time(s),
+given in decimal seconds since 1970-01-01 00:00:00
+Coordinated Universal Time (UTC).
+The
+.I timezone
+determines whether the count includes leap seconds.
+As with
+.BR \*-c ,
+the cutoff's lower bound is inclusive and its upper bound is exclusive.
+.SH "INTERVAL FORMAT"
+The interval format is a compact text representation that is intended
+to be both human- and machine-readable.  It consists of an empty line,
+then a line
+.q "TZ=\fIstring\fP"
+where
+.I string
+is a double-quoted string giving the timezone, a second line
+.q "\*- \*- \fIinterval\fP"
+describing the time interval before the first transition if any, and
+zero or more following lines
+.q "\fIdate time interval\fP",
+one line for each transition time and following interval.  Fields are
+separated by single tabs.
+.PP
+Dates are in
+.IR yyyy - mm - dd
+format and times are in 24-hour
+.IR hh : mm : ss
+format where
+.IR hh <24.
+Times are in local time immediately after the transition.  A
+time interval description consists of a UT offset in signed
+.RI \(+- hhmmss
+format, a time zone abbreviation, and an isdst flag.  An abbreviation
+that equals the UT offset is omitted; other abbreviations are
+double-quoted strings unless they consist of one or more alphabetic
+characters.  An isdst flag is omitted for standard time, and otherwise
+is a decimal integer that is unsigned and positive (typically 1) for
+daylight saving time and negative for unknown.
+.PP
+In times and in UT offsets with absolute value less than 100 hours,
+the seconds are omitted if they are zero, and
+the minutes are also omitted if they are also zero.  Positive UT
+offsets are east of Greenwich.  The UT offset \*-00 denotes a UT
+placeholder in areas where the actual offset is unspecified; by
+convention, this occurs when the UT offset is zero and the time zone
+abbreviation begins with
+.q "\*-"
+or is
+.q "zzz".
+.PP
+In double-quoted strings, escape sequences represent unusual
+characters.  The escape sequences are \es for space, and \e", \e\e,
+\ef, \en, \er, \et, and \ev with their usual meaning in the C
+programming language.  E.g., the double-quoted string
+\*(lq"CET\es\e"\e\e"\*(rq represents the character sequence \*(lqCET
+"\e\*(rq.\""
+.PP
+.ne 9
+Here is an example of the output, with the leading empty line omitted.
+(This example is shown with tab stops set far enough apart so that the
+tabbed columns line up.)
+.nf
+.sp
+.if \n(.g .ft CR
+.if t .in +.5i
+.if n .in +2
+.nr w \w'1896-01-13  'u+\n(.i
+.ta \w'1896-01-13  'u +\w'12:01:26  'u +\w'-103126  'u +\w'HWT  'u
+TZ="Pacific/Honolulu"
+-	-	-103126	LMT
+1896-01-13	12:01:26	-1030	HST
+1933-04-30	03	-0930	HDT	1
+1933-05-21	11	-1030	HST
+1942-02-09	03	-0930	HWT	1
+1945-08-14	13:30	-0930	HPT	1
+1945-09-30	01	-1030	HST
+1947-06-08	02:30	-10	HST
+.in
+.if \n(.g .ft
+.sp
+.fi
+Here, local time begins 10 hours, 31 minutes and 26 seconds west of
+UT, and is a standard time abbreviated LMT.  Immediately after the
+first transition, the date is 1896-01-13 and the time is 12:01:26, and
+the following time interval is 10.5 hours west of UT, a standard time
+abbreviated HST.  Immediately after the second transition, the date is
+1933-04-30 and the time is 03:00:00 and the following time interval is
+9.5 hours west of UT, is abbreviated HDT, and is daylight saving time.
+Immediately after the last transition the date is 1947-06-08 and the
+time is 02:30:00, and the following time interval is 10 hours west of
+UT, a standard time abbreviated HST.
+.PP
+.ne 10
+Here are excerpts from another example:
+.nf
+.sp
+.if \n(.g .ft CR
+.if t .in +.5i
+.if n .in +2
+TZ="Europe/Astrakhan"
+-	-	+031212	LMT
+1924-04-30	23:47:48	+03
+1930-06-21	01	+04
+1981-04-01	01	+05		1
+1981-09-30	23	+04
+\&...
+2014-10-26	01	+03
+2016-03-27	03	+04
+.in
+.if \n(.g .ft
+.sp
+.fi
+This time zone is east of UT, so its UT offsets are positive.  Also,
+many of its time zone abbreviations are omitted since they duplicate
+the text of the UT offset.
+.SH LIMITATIONS
+Time discontinuities are found by sampling the results returned by
+.BR localtime (3)
+at twelve-hour intervals.
+This works in all real-world cases;
+one can construct artificial time zones for which this fails.
+.PP
+In the
+.B \*-v
+and
+.B \*-V
+output,
+.q "UT"
+denotes the value returned by
+.BR gmtime (3),
+which uses UTC for modern timestamps and some other UT flavor for
+timestamps that predate the introduction of UTC.
+No attempt is currently made to have the output use
+.q "UTC"
+for newer and
+.q "UT"
+for older timestamps, partly because the exact date of the
+introduction of UTC is problematic.
+.SH SEE ALSO
+.BR tzfile (5),
+.BR zic (8)
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zdump.c
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zdump.c
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zic.8
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zic.8
@@ -0,0 +1,900 @@
+.\" This file is in the public domain, so clarified as of
+.\" 2009-05-17 by Arthur David Olson.
+.TH zic 8
+.SH NAME
+zic \- timezone compiler
+.SH SYNOPSIS
+.B zic
+[
+.I option
+\&... ] [
+.I filename
+\&... ]
+.SH DESCRIPTION
+.ie '\(lq'' .ds lq \&"\"
+.el .ds lq \(lq\"
+.ie '\(rq'' .ds rq \&"\"
+.el .ds rq \(rq\"
+.de q
+\\$3\*(lq\\$1\*(rq\\$2
+..
+.ie '\(la'' .ds < <
+.el .ds < \(la
+.ie '\(ra'' .ds > >
+.el .ds > \(ra
+.ie \n(.g \{\
+.  ds : \:
+.  ds - \f(CR-\fP
+.\}
+.el \{\
+.  ds :
+.  ds - \-
+.\}
+.ds d " degrees
+.ds m " minutes
+.ds s " seconds
+.ds _ " \&
+.if t \{\
+. if \n(.g .if c \(de .if c \(fm .if c \(sd \{\
+.  ds d \(de
+.  ds m \(fm
+.  ds s \(sd
+.  ds _ \|
+. \}
+.\}
+The
+.B zic
+program reads text from the file(s) named on the command line
+and creates the timezone information format (TZif) files
+specified in this input.
+If a
+.I filename
+is
+.q "\*-" ,
+standard input is read.
+.SH OPTIONS
+.TP
+.B "\*-\*-version"
+Output version information and exit.
+.TP
+.B \*-\*-help
+Output short usage message and exit.
+.TP
+.BI "\*-b " bloat
+Output backward-compatibility data as specified by
+.IR bloat .
+If
+.I bloat
+is
+.BR fat ,
+generate additional data entries that work around potential bugs or
+incompatibilities in older software, such as software that mishandles
+the 64-bit generated data.
+If
+.I bloat
+is
+.BR slim ,
+keep the output files small; this can help check for the bugs
+and incompatibilities.
+The default is
+.BR slim ,
+as software that mishandles 64-bit data typically
+mishandles timestamps after the year 2038 anyway.
+Also see the
+.B \*-r
+option for another way to alter output size.
+.TP
+.BI "\*-d " directory
+Create time conversion information files in the named directory rather than
+in the standard directory named below.
+.TP
+.BI "\*-l " timezone
+Use
+.I timezone
+as local time.
+.B zic
+will act as if the input contained a link line of the form
+.sp
+.ti +.5i
+.ta \w'Link\0\0'u  +\w'\fItimezone\fP\0\0'u
+Link	\fItimezone\fP		localtime
+.sp
+If
+.I timezone
+is
+.BR \*- ,
+any already-existing link is removed.
+.TP
+.BI "\*-L " leapsecondfilename
+Read leap second information from the file with the given name.
+If this option is not used,
+no leap second information appears in output files.
+.TP
+.BI "\*-p " timezone
+Use
+.IR timezone 's
+rules when handling nonstandard
+TZ strings like "EET\*-2EEST" that lack transition rules.
+.B zic
+will act as if the input contained a link line of the form
+.sp
+.ti +.5i
+Link	\fItimezone\fP		posixrules
+.sp
+This feature is obsolete and poorly supported.
+Among other things it should not be used for timestamps after the year 2037,
+and it should not be combined with
+.B "\*-b slim"
+if
+.IR timezone 's
+transitions are at standard time or Universal Time (UT) instead of local time.
+.sp
+If
+.I timezone
+is
+.BR \*- ,
+any already-existing link is removed.
+.TP
+.BR "\*-r " "[\fB@\fP\fIlo\fP][\fB/@\fP\fIhi\fP]"
+Limit the applicability of output files
+to timestamps in the range from
+.I lo
+(inclusive) to
+.I hi
+(exclusive), where
+.I lo
+and
+.I hi
+are possibly-signed decimal counts of seconds since the Epoch
+(1970-01-01 00:00:00 UTC).
+Omitted counts default to extreme values.
+The output files use UT offset 0 and abbreviation
+.q "\*-00"
+in place of the omitted timestamp data.
+For example,
+.q "zic \*-r @0"
+omits data intended for negative timestamps (i.e., before the Epoch), and
+.q "zic \*-r @0/@2147483648"
+outputs data intended only for nonnegative timestamps that fit into
+31-bit signed integers.
+On platforms with GNU
+.BR date ,
+.q "zic \*-r @$(date +%s)"
+omits data intended for past timestamps.
+Although this option typically reduces the output file's size,
+the size can increase due to the need to represent the timestamp range
+boundaries, particularly if
+.I hi
+causes a TZif file to contain explicit entries for
+.RI pre- hi
+transitions rather than concisely representing them
+with an extended POSIX TZ string.
+Also see the
+.B "\*-b slim"
+option for another way to shrink output size.
+.TP
+.BI "\*-R @" hi
+Generate redundant trailing explicit transitions for timestamps
+that occur less than
+.I hi
+seconds since the Epoch, even though the transitions could be
+more concisely represented via the extended POSIX TZ string.
+This option does not affect the represented timestamps.
+Although it accommodates nonstandard TZif readers
+that ignore the extended POSIX TZ string,
+it increases the size of the altered output files.
+.TP
+.BI "\*-t " file
+When creating local time information, put the configuration link in
+the named file rather than in the standard location.
+.TP
+.B \*-v
+Be more verbose, and complain about the following situations:
+.RS
+.PP
+The input specifies a link to a link,
+something not supported by some older parsers, including
+.B zic
+itself through release 2022e.
+.PP
+A year that appears in a data file is outside the range
+of representable years.
+.PP
+A time of 24:00 or more appears in the input.
+Pre-1998 versions of
+.B zic
+prohibit 24:00, and pre-2007 versions prohibit times greater than 24:00.
+.PP
+A rule goes past the start or end of the month.
+Pre-2004 versions of
+.B zic
+prohibit this.
+.PP
+A time zone abbreviation uses a
+.B %z
+format.
+Pre-2015 versions of
+.B zic
+do not support this.
+.PP
+A timestamp contains fractional seconds.
+Pre-2018 versions of
+.B zic
+do not support this.
+.PP
+The input contains abbreviations that are mishandled by pre-2018 versions of
+.B zic
+due to a longstanding coding bug.
+These abbreviations include
+.q L
+for
+.q Link ,
+.q mi
+for
+.q min ,
+.q Sa
+for
+.q Sat ,
+and
+.q Su
+for
+.q Sun .
+.PP
+The output file does not contain all the information about the
+long-term future of a timezone, because the future cannot be summarized as
+an extended POSIX TZ string.  For example, as of 2019 this problem
+occurs for Iran's daylight-saving rules for the predicted future, as
+these rules are based on the Iranian calendar, which cannot be
+represented.
+.PP
+The output contains data that may not be handled properly by client
+code designed for older
+.B zic
+output formats.  These compatibility issues affect only timestamps
+before 1970 or after the start of 2038.
+.PP
+The output contains a truncated leap second table,
+which can cause some older TZif readers to misbehave.
+This can occur if the
+.B "\*-L"
+option is used, and either an Expires line is present or
+the
+.B "\*-r"
+option is also used.
+.PP
+The output file contains more than 1200 transitions,
+which may be mishandled by some clients.
+The current reference client supports at most 2000 transitions;
+pre-2014 versions of the reference client support at most 1200
+transitions.
+.PP
+A time zone abbreviation has fewer than 3 or more than 6 characters.
+POSIX requires at least 3, and requires implementations to support
+at least 6.
+.PP
+An output file name contains a byte that is not an ASCII letter,
+.q "\*-" ,
+.q "/" ,
+or
+.q "_" ;
+or it contains a file name component that contains more than 14 bytes
+or that starts with
+.q "\*-" .
+.RE
+.SH FILES
+Input files use the format described in this section; output files use
+.BR tzfile (5)
+format.
+.PP
+Input files should be text files, that is, they should be a series of
+zero or more lines, each ending in a newline byte and containing at
+most 2048 bytes counting the newline, and without any NUL bytes.
+The input text's encoding
+is typically UTF-8 or ASCII; it should have a unibyte representation
+for the POSIX Portable Character Set (PPCS)
+\*<https://pubs\*:.opengroup\*:.org/\*:onlinepubs/\*:9699919799/\*:basedefs/\*:V1_chap06\*:.html\*>
+and the encoding's non-unibyte characters should consist entirely of
+non-PPCS bytes.  Non-PPCS characters typically occur only in comments:
+although output file names and time zone abbreviations can contain
+nearly any character, other software will work better if these are
+limited to the restricted syntax described under the
+.B \*-v
+option.
+.PP
+Input lines are made up of fields.
+Fields are separated from one another by one or more white space characters.
+The white space characters are space, form feed, carriage return, newline,
+tab, and vertical tab.
+Leading and trailing white space on input lines is ignored.
+An unquoted sharp character (#) in the input introduces a comment which extends
+to the end of the line the sharp character appears on.
+White space characters and sharp characters may be enclosed in double quotes
+(") if they're to be used as part of a field.
+Any line that is blank (after comment stripping) is ignored.
+Nonblank lines are expected to be of one of three types:
+rule lines, zone lines, and link lines.
+.PP
+Names must be in English and are case insensitive.
+They appear in several contexts, and include month and weekday names
+and keywords such as
+.BR "maximum" ,
+.BR "only" ,
+.BR "Rolling" ,
+and
+.BR "Zone" .
+A name can be abbreviated by omitting all but an initial prefix; any
+abbreviation must be unambiguous in context.
+.PP
+A rule line has the form
+.nf
+.ti +.5i
+.ta \w'Rule\0\0'u +\w'NAME\0\0'u +\w'FROM\0\0'u +\w'1973\0\0'u +\w'\*-\0\0'u +\w'Apr\0\0'u +\w'lastSun\0\0'u +\w'2:00w\0\0'u +\w'1:00d\0\0'u
+.sp
+Rule	NAME	FROM	TO	\*-	IN	ON	AT	SAVE	LETTER/S
+.sp
+For example:
+.ti +.5i
+.sp
+Rule	US	1967	1973	\*-	Apr	lastSun	2:00w	1:00d	D
+.sp
+.fi
+The fields that make up a rule line are:
+.TP "\w'LETTER/S'u"
+.B NAME
+Gives the name of the rule set that contains this line.
+The name must start with a character that is neither
+an ASCII digit nor
+.q \*-
+nor
+.q + .
+To allow for future extensions,
+an unquoted name should not contain characters from the set
+.ie \n(.g .q \f(CR!$%&\(aq()*,/:;<=>?@[\e]\(ha\(ga{|}\(ti\fP .
+.el .ie t .q \f(CW!$%&'()*,/:;<=>?@[\e]^\(ga{|}~\fP .
+.el .q !$%&'()*,/:;<=>?@[\e]^`{|}~ .
+.TP
+.B FROM
+Gives the first year in which the rule applies.
+Any signed integer year can be supplied; the proleptic Gregorian calendar
+is assumed, with year 0 preceding year 1.
+The word
+.B minimum
+(or an abbreviation) means the indefinite past.
+The word
+.B maximum
+(or an abbreviation) means the indefinite future.
+Rules can describe times that are not representable as time values,
+with the unrepresentable times ignored; this allows rules to be portable
+among hosts with differing time value types.
+.TP
+.B TO
+Gives the final year in which the rule applies.
+In addition to
+.B minimum
+and
+.B maximum
+(as above),
+the word
+.B only
+(or an abbreviation)
+may be used to repeat the value of the
+.B FROM
+field.
+.TP
+.B \*-
+Is a reserved field and should always contain
+.q \*-
+for compatibility with older versions of
+.BR zic .
+It was previously known as the
+.B TYPE
+field, which could contain values to allow a
+separate script to further restrict in which
+.q types
+of years the rule would apply.
+.TP
+.B IN
+Names the month in which the rule takes effect.
+Month names may be abbreviated.
+.TP
+.B ON
+Gives the day on which the rule takes effect.
+Recognized forms include:
+.nf
+.in +.5i
+.sp
+.ta \w'Sun<=25\0\0'u
+5	the fifth of the month
+lastSun	the last Sunday in the month
+lastMon	the last Monday in the month
+Sun>=8	first Sunday on or after the eighth
+Sun<=25	last Sunday on or before the 25th
+.fi
+.in -.5i
+.sp
+A weekday name (e.g.,
+.BR "Sunday" )
+or a weekday name preceded by
+.q "last"
+(e.g.,
+.BR "lastSunday" )
+may be abbreviated or spelled out in full.
+There must be no white space characters within the
+.B ON
+field.
+The
+.q <=
+and
+.q >=
+constructs can result in a day in the neighboring month;
+for example, the IN-ON combination
+.q "Oct Sun>=31"
+stands for the first Sunday on or after October 31,
+even if that Sunday occurs in November.
+.TP
+.B AT
+Gives the time of day at which the rule takes effect,
+relative to 00:00, the start of a calendar day.
+Recognized forms include:
+.nf
+.in +.5i
+.sp
+.ta \w'00:19:32.13\0\0'u
+2	time in hours
+2:00	time in hours and minutes
+01:28:14	time in hours, minutes, and seconds
+00:19:32.13	time with fractional seconds
+12:00	midday, 12 hours after 00:00
+15:00	3 PM, 15 hours after 00:00
+24:00	end of day, 24 hours after 00:00
+260:00	260 hours after 00:00
+\*-2:30	2.5 hours before 00:00
+\*-	equivalent to 0
+.fi
+.in -.5i
+.sp
+Although
+.B zic
+rounds times to the nearest integer second
+(breaking ties to the even integer), the fractions may be useful
+to other applications requiring greater precision.
+The source format does not specify any maximum precision.
+Any of these forms may be followed by the letter
+.B w
+if the given time is local or
+.q "wall clock"
+time,
+.B s
+if the given time is standard time without any adjustment for daylight saving,
+or
+.B u
+(or
+.B g
+or
+.BR z )
+if the given time is universal time;
+in the absence of an indicator,
+local (wall clock) time is assumed.
+These forms ignore leap seconds; for example,
+if a leap second occurs at 00:59:60 local time,
+.q "1:00"
+stands for 3601 seconds after local midnight instead of the usual 3600 seconds.
+The intent is that a rule line describes the instants when a
+clock/calendar set to the type of time specified in the
+.B AT
+field would show the specified date and time of day.
+.TP
+.B SAVE
+Gives the amount of time to be added to local standard time when the rule is in
+effect, and whether the resulting time is standard or daylight saving.
+This field has the same format as the
+.B AT
+field
+except with a different set of suffix letters:
+.B s
+for standard time and
+.B d
+for daylight saving time.
+The suffix letter is typically omitted, and defaults to
+.B s
+if the offset is zero and to
+.B d
+otherwise.
+Negative offsets are allowed; in Ireland, for example, daylight saving
+time is observed in winter and has a negative offset relative to
+Irish Standard Time.
+The offset is merely added to standard time; for example,
+.B zic
+does not distinguish a 10:30 standard time plus an 0:30
+.B SAVE
+from a 10:00 standard time plus a 1:00
+.BR SAVE .
+.TP
+.B LETTER/S
+Gives the
+.q "variable part"
+(for example, the
+.q "S"
+or
+.q "D"
+in
+.q "EST"
+or
+.q "EDT" )
+of time zone abbreviations to be used when this rule is in effect.
+If this field is
+.q \*- ,
+the variable part is null.
+.PP
+A zone line has the form
+.sp
+.nf
+.ti +.5i
+.ta \w'Zone\0\0'u +\w'Asia/Amman\0\0'u +\w'STDOFF\0\0'u +\w'Jordan\0\0'u +\w'FORMAT\0\0'u
+Zone	NAME	STDOFF	RULES	FORMAT	[UNTIL]
+.sp
+For example:
+.sp
+.ti +.5i
+Zone	Asia/Amman	2:00	Jordan	EE%sT	2017 Oct 27 01:00
+.sp
+.fi
+The fields that make up a zone line are:
+.TP "\w'STDOFF'u"
+.B NAME
+The name of the timezone.
+This is the name used in creating the time conversion information file for the
+timezone.
+It should not contain a file name component
+.q ".\&"
+or
+.q ".." ;
+a file name component is a maximal substring that does not contain
+.q "/" .
+.TP
+.B STDOFF
+The amount of time to add to UT to get standard time,
+without any adjustment for daylight saving.
+This field has the same format as the
+.B AT
+and
+.B SAVE
+fields of rule lines, except without suffix letters;
+begin the field with a minus sign if time must be subtracted from UT.
+.TP
+.B RULES
+The name of the rules that apply in the timezone or,
+alternatively, a field in the same format as a rule-line SAVE column,
+giving the amount of time to be added to local standard time
+and whether the resulting time is standard or daylight saving.
+If this field is
+.B \*-
+then standard time always applies.
+When an amount of time is given, only the sum of standard time and
+this amount matters.
+.TP
+.B FORMAT
+The format for time zone abbreviations.
+The pair of characters
+.B %s
+is used to show where the
+.q "variable part"
+of the time zone abbreviation goes.
+Alternatively, a format can use the pair of characters
+.B %z
+to stand for the UT offset in the form
+.RI \(+- hh ,
+.RI \(+- hhmm ,
+or
+.RI \(+- hhmmss ,
+using the shortest form that does not lose information, where
+.IR hh ,
+.IR mm ,
+and
+.I ss
+are the hours, minutes, and seconds east (+) or west (\-) of UT.
+Alternatively,
+a slash (/)
+separates standard and daylight abbreviations.
+To conform to POSIX, a time zone abbreviation should contain only
+alphanumeric ASCII characters,
+.q "+"
+and
+.q "\*-".
+By convention, the time zone abbreviation
+.q "\*-00"
+is a placeholder that means local time is unspecified.
+.TP
+.B UNTIL
+The time at which the UT offset or the rule(s) change for a location.
+It takes the form of one to four fields YEAR [MONTH [DAY [TIME]]].
+If this is specified,
+the time zone information is generated from the given UT offset
+and rule change until the time specified, which is interpreted using
+the rules in effect just before the transition.
+The month, day, and time of day have the same format as the IN, ON, and AT
+fields of a rule; trailing fields can be omitted, and default to the
+earliest possible value for the missing fields.
+.IP
+The next line must be a
+.q "continuation"
+line; this has the same form as a zone line except that the
+string
+.q "Zone"
+and the name are omitted, as the continuation line will
+place information starting at the time specified as the
+.q "until"
+information in the previous line in the file used by the previous line.
+Continuation lines may contain
+.q "until"
+information, just as zone lines do, indicating that the next line is a further
+continuation.
+.PP
+If a zone changes at the same instant that a rule would otherwise take
+effect in the earlier zone or continuation line, the rule is ignored.
+A zone or continuation line
+.I L
+with a named rule set starts with standard time by default:
+that is, any of
+.IR L 's
+timestamps preceding
+.IR L 's
+earliest rule use the rule in effect after
+.IR L 's
+first transition into standard time.
+In a single zone it is an error if two rules take effect at the same
+instant, or if two zone changes take effect at the same instant.
+.PP
+If a continuation line subtracts
+.I N
+seconds from the UT offset after a transition that would be
+interpreted to be later if using the continuation line's UT offset and
+rules, the
+.q "until"
+time of the previous zone or continuation line is interpreted
+according to the continuation line's UT offset and rules, and any rule
+that would otherwise take effect in the next
+.I N
+seconds is instead assumed to take effect simultaneously.
+For example:
+.br
+.ne 7
+.nf
+.in +2m
+.ta \w'# Rule\0\0'u +\w'NAME\0\0'u +\w'FROM\0\0'u +\w'2006\0\0'u +\w'\*-\0\0'u +\w'Oct\0\0'u +\w'lastSun\0\0'u +\w'2:00\0\0'u +\w'SAVE\0\0'u
+.sp
+# Rule	NAME	FROM	TO	\*-	IN	ON	AT	SAVE	LETTER/S
+Rule	US	1967	2006	-	Oct	lastSun	2:00	0	S
+Rule	US	1967	1973	-	Apr	lastSun	2:00	1:00	D
+.ta \w'Zone\0\0America/Menominee\0\0'u +\w'STDOFF\0\0'u +\w'RULES\0\0'u +\w'FORMAT\0\0'u
+# Zone\0\0NAME	STDOFF	RULES	FORMAT	[UNTIL]
+Zone\0\0America/Menominee	\*-5:00	\*-	EST	1973 Apr 29 2:00
+	\*-6:00	US	C%sT
+.sp
+.in
+.fi
+Here, an incorrect reading would be there were two clock changes on 1973-04-29,
+the first from 02:00 EST (\*-05) to 01:00 CST (\*-06),
+and the second an hour later from 02:00 CST (\*-06) to 03:00 CDT (\*-05).
+However,
+.B zic
+interprets this more sensibly as a single transition from 02:00 CST (\*-05) to
+02:00 CDT (\*-05).
+.PP
+A link line has the form
+.sp
+.nf
+.ti +.5i
+.ta \w'Link\0\0'u +\w'Europe/Istanbul\0\0'u
+Link	TARGET	LINK-NAME
+.sp
+For example:
+.sp
+.ti +.5i
+Link	Europe/Istanbul	Asia/Istanbul
+.sp
+.fi
+The
+.B TARGET
+field should appear as the
+.B NAME
+field in some zone line or as the
+.B LINK-NAME
+field in some link line.
+The
+.B LINK-NAME
+field is used as an alternative name for that zone;
+it has the same syntax as a zone line's
+.B NAME
+field.
+Links can chain together, although the behavior is unspecified if a
+chain of one or more links does not terminate in a Zone name.
+A link line can appear before the line that defines the link target.
+For example:
+.sp
+.ne 3
+.nf
+.in +2m
+.ta \w'Zone\0\0'u +\w'Greenwich\0\0'u
+Link	Greenwich	G_M_T
+Link	Etc/GMT	Greenwich
+Zone	Etc/GMT\0\00\0\0\*-\0\0GMT
+.sp
+.in
+.fi
+The two links are chained together, and G_M_T, Greenwich, and Etc/GMT
+all name the same zone.
+.PP
+Except for continuation lines,
+lines may appear in any order in the input.
+However, the behavior is unspecified if multiple zone or link lines
+define the same name.
+.PP
+The file that describes leap seconds can have leap lines and an
+expiration line.
+Leap lines have the following form:
+.nf
+.ti +.5i
+.ta \w'Leap\0\0'u +\w'YEAR\0\0'u +\w'MONTH\0\0'u +\w'DAY\0\0'u +\w'HH:MM:SS\0\0'u +\w'CORR\0\0'u
+.sp
+Leap	YEAR	MONTH	DAY	HH:MM:SS	CORR	R/S
+.sp
+For example:
+.ti +.5i
+.sp
+Leap	2016	Dec	31	23:59:60	+	S
+.sp
+.fi
+The
+.BR YEAR ,
+.BR MONTH ,
+.BR DAY ,
+and
+.B HH:MM:SS
+fields tell when the leap second happened.
+The
+.B CORR
+field
+should be
+.q "+"
+if a second was added
+or
+.q "\*-"
+if a second was skipped.
+The
+.B R/S
+field
+should be (an abbreviation of)
+.q "Stationary"
+if the leap second time given by the other fields should be interpreted as UTC
+or
+(an abbreviation of)
+.q "Rolling"
+if the leap second time given by the other fields should be interpreted as
+local (wall clock) time.
+.PP
+Rolling leap seconds were implemented back when it was not
+clear whether common practice was rolling or stationary,
+with concerns that one would see
+Times Square ball drops where there'd be a
+.q "3... 2... 1... leap... Happy New Year"
+countdown, placing the leap second at
+midnight New York time rather than midnight UTC.
+However, this countdown style does not seem to have caught on,
+which means rolling leap seconds are not used in practice;
+also, they are not supported if the
+.B \*-r
+option is used.
+.PP
+The expiration line, if present, has the form:
+.nf
+.ti +.5i
+.ta \w'Expires\0\0'u +\w'YEAR\0\0'u +\w'MONTH\0\0'u +\w'DAY\0\0'u
+.sp
+Expires	YEAR	MONTH	DAY	HH:MM:SS
+.sp
+For example:
+.ti +.5i
+.sp
+Expires	2020	Dec	28	00:00:00
+.sp
+.fi
+The
+.BR YEAR ,
+.BR MONTH ,
+.BR DAY ,
+and
+.B HH:MM:SS
+fields give the expiration timestamp in UTC for the leap second table.
+.br
+.ne 22
+.SH "EXTENDED EXAMPLE"
+Here is an extended example of
+.B zic
+input, intended to illustrate many of its features.
+.nf
+.in +2m
+.ta \w'# Rule\0\0'u +\w'NAME\0\0'u +\w'FROM\0\0'u +\w'1973\0\0'u +\w'\*-\0\0'u +\w'Apr\0\0'u +\w'lastSun\0\0'u +\w'2:00\0\0'u +\w'SAVE\0\0'u
+.sp
+# Rule	NAME	FROM	TO	\*-	IN	ON	AT	SAVE	LETTER/S
+Rule	Swiss	1941	1942	\*-	May	Mon>=1	1:00	1:00	S
+Rule	Swiss	1941	1942	\*-	Oct	Mon>=1	2:00	0	\*-
+.sp .5
+Rule	EU	1977	1980	\*-	Apr	Sun>=1	1:00u	1:00	S
+Rule	EU	1977	only	\*-	Sep	lastSun	1:00u	0	\*-
+Rule	EU	1978	only	\*-	Oct	 1	1:00u	0	\*-
+Rule	EU	1979	1995	\*-	Sep	lastSun	1:00u	0	\*-
+Rule	EU	1981	max	\*-	Mar	lastSun	1:00u	1:00	S
+Rule	EU	1996	max	\*-	Oct	lastSun	1:00u	0	\*-
+.sp
+.ta \w'# Zone\0\0'u +\w'Europe/Zurich\0\0'u +\w'0:29:45.50\0\0'u +\w'RULES\0\0'u +\w'FORMAT\0\0'u
+# Zone	NAME	STDOFF	RULES	FORMAT	[UNTIL]
+Zone	Europe/Zurich	0:34:08	\*-	LMT	1853 Jul 16
+		0:29:45.50	\*-	BMT	1894 Jun
+		1:00	Swiss	CE%sT	1981
+		1:00	EU	CE%sT
+.sp
+Link	Europe/Zurich	Europe/Vaduz
+.sp
+.in
+.fi
+In this example, the EU rules are for the European Union
+and for its predecessor organization, the European Communities.
+The timezone is named Europe/Zurich and it has the alias Europe/Vaduz.
+This example says that Zurich was 34 minutes and 8
+seconds east of UT until 1853-07-16 at 00:00, when the legal offset
+was changed to
+7\*d\*_26\*m\*_22.50\*s,
+which works out to 0:29:45.50;
+.B zic
+treats this by rounding it to 0:29:46.
+After 1894-06-01 at 00:00 the UT offset became one hour
+and Swiss daylight saving rules (defined with lines beginning with
+.q "Rule Swiss")
+apply.  From 1981 to the present, EU daylight saving rules have
+applied, and the UTC offset has remained at one hour.
+.PP
+In 1941 and 1942, daylight saving time applied from the first Monday
+in May at 01:00 to the first Monday in October at 02:00.
+The pre-1981 EU daylight-saving rules have no effect
+here, but are included for completeness.  Since 1981, daylight
+saving has begun on the last Sunday in March at 01:00 UTC.
+Until 1995 it ended the last Sunday in September at 01:00 UTC,
+but this changed to the last Sunday in October starting in 1996.
+.PP
+For purposes of display,
+.q "LMT"
+and
+.q "BMT"
+were initially used, respectively.  Since
+Swiss rules and later EU rules were applied, the time zone abbreviation
+has been CET for standard time and CEST for daylight saving
+time.
+.SH FILES
+.TP
+.I /etc/localtime
+Default local timezone file.
+.TP
+.I /usr/share/zoneinfo
+Default timezone information directory.
+.SH NOTES
+For areas with more than two types of local time,
+you may need to use local standard time in the
+.B AT
+field of the earliest transition time's rule to ensure that
+the earliest transition time recorded in the compiled file is correct.
+.PP
+If,
+for a particular timezone,
+a clock advance caused by the start of daylight saving
+coincides with and is equal to
+a clock retreat caused by a change in UT offset,
+.B zic
+produces a single transition to daylight saving at the new UT offset
+without any change in local (wall clock) time.
+To get separate transitions
+use multiple zone continuation lines
+specifying transition instants using universal time.
+.SH SEE ALSO
+.BR tzfile (5),
+.BR zdump (8)
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zic.c
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zic.c
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/ziguard.awk
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/ziguard.awk
@@ -0,0 +1,386 @@
+# Convert tzdata source into vanguard or rearguard form.
+
+# Contributed by Paul Eggert.  This file is in the public domain.
+
+# This is not a general-purpose converter; it is designed for current tzdata.
+# It just converts from current source to main, vanguard, and rearguard forms.
+# Although it might be nice for it to be idempotent, or to be useful
+# for converting back and forth between vanguard and rearguard formats,
+# it does not do these nonessential tasks now.
+#
+# Although main and vanguard forms are currently equivalent,
+# this need not always be the case.  When the two forms differ,
+# this script can convert either from main to vanguard form (needed then),
+# or from vanguard to main form (this conversion would be needed later,
+# after main became rearguard and vanguard became main).
+# There is no need to convert rearguard to other forms.
+#
+# When converting to vanguard form, the output can use the line
+# "Zone GMT 0 - GMT" which TZUpdater 2.3.2 mistakenly rejects.
+#
+# When converting to vanguard form, the output can use negative SAVE
+# values.
+#
+# When converting to rearguard form, the output uses only nonnegative
+# SAVE values.  The idea is for the output data to simulate the behavior
+# of the input data as best it can within the constraints of the
+# rearguard format.
+
+# Given a FIELD like "-0:30", return a minute count like -30.
+function get_minutes(field, \
+		     sign, hours, minutes)
+{
+  sign = field ~ /^-/ ? -1 : 1
+  hours = +field
+  if (field ~ /:/) {
+    minutes = field
+    sub(/[^:]*:/, "", minutes)
+  }
+  return 60 * hours + sign * minutes
+}
+
+# Given an OFFSET, which is a minute count like 300 or 330,
+# return a %z-style abbreviation like "+05" or "+0530".
+function offset_abbr(offset, \
+		     hours, minutes, sign)
+{
+  hours = int(offset / 60)
+  minutes = offset % 60
+  if (minutes) {
+    return sprintf("%+.4d", hours * 100 + minutes);
+  } else {
+    return sprintf("%+.2d", hours)
+  }
+}
+
+# Round TIMESTAMP (a +-hh:mm:ss.dddd string) to the nearest second.
+function round_to_second(timestamp, \
+			 hh, mm, ss, seconds, dot_dddd, subseconds)
+{
+  dot_dddd = timestamp
+  if (!sub(/^[+-]?[0-9]+:[0-9]+:[0-9]+\./, ".", dot_dddd))
+    return timestamp
+  hh = mm = ss = timestamp
+  sub(/^[-+]?[0-9]+:[0-9]+:/, "", ss)
+  sub(/^[-+]?[0-9]+:/, "", mm)
+  sub(/^[-+]?/, "", hh)
+  seconds = 3600 * hh + 60 * mm + ss
+  subseconds = +dot_dddd
+  seconds += 0.5 < subseconds || ((subseconds == 0.5) && (seconds % 2));
+  return sprintf("%s%d:%.2d:%.2d", timestamp ~ /^-/ ? "-" : "", \
+		 seconds / 3600, seconds / 60 % 60, seconds % 60)
+}
+
+BEGIN {
+  dataform_type["vanguard"] = 1
+  dataform_type["main"] = 1
+  dataform_type["rearguard"] = 1
+
+  if (PACKRATLIST) {
+    while (getline <PACKRATLIST) {
+      if ($0 ~ /^#/) continue
+      packratlist[$3] = 1
+    }
+  }
+
+  # The command line should set DATAFORM.
+  if (!dataform_type[DATAFORM]) exit 1
+}
+
+$1 == "#PACKRATLIST" && $2 == PACKRATLIST {
+  sub(/^#PACKRATLIST[\t ]+[^\t ]+[\t ]+/, "")
+}
+
+/^Zone/ { zone = $2 }
+
+DATAFORM != "main" {
+  in_comment = $0 ~ /^#/
+  uncomment = comment_out = 0
+
+  # If this line should differ due to Czechoslovakia using negative SAVE values,
+  # uncomment the desired version and comment out the undesired one.
+  if (zone == "Europe/Prague" && $0 ~ /^#?[\t ]+[01]:00[\t ]/ \
+      && $0 ~ /1947 Feb 23/) {
+    if (($(in_comment + 2) != "-") == (DATAFORM != "rearguard")) {
+      uncomment = in_comment
+    } else {
+      comment_out = !in_comment
+    }
+  }
+
+  # If this line should differ due to Ireland using negative SAVE values,
+  # uncomment the desired version and comment out the undesired one.
+  Rule_Eire = $0 ~ /^#?Rule[\t ]+Eire[\t ]/
+  Zone_Dublin_post_1968 \
+    = (zone == "Europe/Dublin" && $0 ~ /^#?[\t ]+[01]:00[\t ]/ \
+       && (!$(in_comment + 4) || 1968 < $(in_comment + 4)))
+  if (Rule_Eire || Zone_Dublin_post_1968) {
+    if ((Rule_Eire \
+	 || (Zone_Dublin_post_1968 && $(in_comment + 3) == "IST/GMT"))	\
+	== (DATAFORM != "rearguard")) {
+      uncomment = in_comment
+    } else {
+      comment_out = !in_comment
+    }
+  }
+
+  # If this line should differ due to Namibia using negative SAVE values,
+  # uncomment the desired version and comment out the undesired one.
+  Rule_Namibia = $0 ~ /^#?Rule[\t ]+Namibia[\t ]/
+  Zone_using_Namibia_rule \
+    = (zone == "Africa/Windhoek" && $0 ~ /^#?[\t ]+[12]:00[\t ]/ \
+       && ($(in_comment + 2) == "Namibia" \
+	   || ($(in_comment + 2) == "-" && $(in_comment + 3) == "CAT" \
+	       && ((1994 <= $(in_comment + 4) && $(in_comment + 4) <= 2017) \
+		   || in_comment + 3 == NF))))
+  if (Rule_Namibia || Zone_using_Namibia_rule) {
+    if ((Rule_Namibia \
+	 ? ($9 ~ /^-/ || ($9 == 0 && $10 == "CAT")) \
+	 : $(in_comment + 1) == "2:00" && $(in_comment + 2) == "Namibia") \
+	== (DATAFORM != "rearguard")) {
+      uncomment = in_comment
+    } else {
+      comment_out = !in_comment
+    }
+  }
+
+  # If this line should differ due to Portugal benefiting from %z if supported,
+  # uncomment the desired version and comment out the undesired one.
+  if ($0 ~ /^#?[\t ]+-[12]:00[\t ]+Port[\t ]+[%+-]/) {
+    if (($0 ~ /%z/) == (DATAFORM == "vanguard")) {
+      uncomment = in_comment
+    } else {
+      comment_out = !in_comment
+    }
+  }
+
+  # In vanguard form, use the line "Zone GMT 0 - GMT" instead of
+  # "Zone Etc/GMT 0 - GMT" and adjust Link lines accordingly.
+  # This works around a bug in TZUpdater 2.3.2.
+  if (/^#?(Zone|Link)[\t ]+(Etc\/)?GMT[\t ]/) {
+    if (($2 == "GMT") == (DATAFORM == "vanguard")) {
+      uncomment = in_comment
+    } else {
+      comment_out = !in_comment
+    }
+  }
+
+  if (uncomment) {
+    sub(/^#/, "")
+  }
+  if (comment_out) {
+    sub(/^/, "#")
+  }
+
+  # Prefer %z in vanguard form, explicit abbreviations otherwise.
+  if (DATAFORM == "vanguard") {
+    sub(/^(Zone[\t ]+[^\t ]+)?[\t ]+[^\t ]+[\t ]+[^\t ]+[\t ]+[-+][^\t ]+/, \
+	"&CHANGE-TO-%z")
+    sub(/-00CHANGE-TO-%z/, "-00")
+    sub(/[-+][^\t ]+CHANGE-TO-/, "")
+  } else {
+    if ($0 ~ /^[^#]*%z/) {
+      stdoff_column = 2 * ($0 ~ /^Zone/) + 1
+      rules_column = stdoff_column + 1
+      stdoff = get_minutes($stdoff_column)
+      rules = $rules_column
+      stdabbr = offset_abbr(stdoff)
+      if (rules == "-") {
+	abbr = stdabbr
+      } else {
+	dstabbr_only = rules ~ /^[+0-9-]/
+	if (dstabbr_only) {
+	  dstoff = get_minutes(rules)
+	} else {
+	  # The DST offset is normally an hour, but there are special cases.
+	  if (rules == "Morocco" && NF == 3) {
+	    dstoff = -60
+	  } else if (rules == "NBorneo") {
+	    dstoff = 20
+	  } else if (((rules == "Cook" || rules == "LH") && NF == 3) \
+		     || (rules == "Uruguay" \
+			 && $0 ~ /[\t ](1942 Dec 14|1960|1970|1974 Dec 22)$/)) {
+	    dstoff = 30
+	  } else if (rules == "Uruguay" && $0 ~ /[\t ]1974 Mar 10$/) {
+	    dstoff = 90
+	  } else {
+	    dstoff = 60
+	  }
+	}
+	dstabbr = offset_abbr(stdoff + dstoff)
+	if (dstabbr_only) {
+	  abbr = dstabbr
+	} else {
+	  abbr = stdabbr "/" dstabbr
+	}
+      }
+      sub(/%z/, abbr)
+    }
+  }
+
+  # Normally, prefer whole seconds.  However, prefer subseconds
+  # if generating vanguard form and the otherwise-undocumented
+  # VANGUARD_SUBSECONDS environment variable is set.
+  # This relies on #STDOFF comment lines in the data.
+  # It is for hypothetical clients that support UT offsets that are
+  # not integer multiples of one second (e.g., Europe/Lisbon, 1884 to 1912).
+  # No known clients need this currently, and this experimental
+  # feature may be changed or withdrawn in future releases.
+  if ($1 == "#STDOFF") {
+    stdoff = $2
+    rounded_stdoff = round_to_second(stdoff)
+    if (DATAFORM == "vanguard" && ENVIRON["VANGUARD_SUBSECONDS"]) {
+      stdoff_subst[0] = rounded_stdoff
+      stdoff_subst[1] = stdoff
+    } else {
+      stdoff_subst[0] = stdoff
+      stdoff_subst[1] = rounded_stdoff
+    }
+  } else if (stdoff_subst[0]) {
+    stdoff_column = 2 * ($0 ~ /^Zone/) + 1
+    stdoff_column_val = $stdoff_column
+    if (stdoff_column_val == stdoff_subst[0]) {
+      sub(stdoff_subst[0], stdoff_subst[1])
+    } else if (stdoff_column_val != stdoff_subst[1]) {
+      stdoff_subst[0] = 0
+    }
+  }
+
+  # In rearguard form, change the Japan rule line with "Sat>=8 25:00"
+  # to "Sun>=9 1:00", to cater to zic before 2007 and to older Java.
+  if ($0 ~ /^Rule/ && $2 == "Japan") {
+    if (DATAFORM == "rearguard") {
+      if ($7 == "Sat>=8" && $8 == "25:00") {
+	sub(/Sat>=8/, "Sun>=9")
+	sub(/25:00/, " 1:00")
+      }
+    } else {
+      if ($7 == "Sun>=9" && $8 == "1:00") {
+	sub(/Sun>=9/, "Sat>=8")
+	sub(/ 1:00/, "25:00")
+      }
+    }
+  }
+
+  # In rearguard form, change the Morocco lines with negative SAVE values
+  # to use positive SAVE values.
+  if ($2 == "Morocco") {
+    if ($0 ~ /^Rule/) {
+      if ($4 ~ /^201[78]$/ && $6 == "Oct") {
+	if (DATAFORM == "rearguard") {
+	  sub(/\t2018\t/, "\t2017\t")
+	} else {
+	  sub(/\t2017\t/, "\t2018\t")
+	}
+      }
+
+      if (2019 <= $3) {
+	if ($8 == "2:00") {
+	  if (DATAFORM == "rearguard") {
+	    sub(/\t0\t/, "\t1:00\t")
+	  } else {
+	    sub(/\t1:00\t/, "\t0\t")
+	  }
+	} else {
+	  if (DATAFORM == "rearguard") {
+	    sub(/\t-1:00\t/, "\t0\t")
+	  } else {
+	    sub(/\t0\t/, "\t-1:00\t")
+	  }
+	}
+      }
+    }
+    if ($1 ~ /^[+0-9-]/ && NF == 3) {
+      if (DATAFORM == "rearguard") {
+	sub(/1:00\tMorocco/, "0:00\tMorocco")
+	sub(/\t\+01\/\+00$/, "\t+00/+01")
+      } else {
+	sub(/0:00\tMorocco/, "1:00\tMorocco")
+	sub(/\t\+00\/+01$/, "\t+01/+00")
+      }
+    }
+  }
+}
+
+/^Zone/ {
+  packrat_ignored = FILENAME == PACKRATDATA && PACKRATLIST && !packratlist[$2];
+}
+{
+  if (packrat_ignored && $0 !~ /^Rule/) {
+    sub(/^/, "#")
+  }
+}
+
+# Return a link line resulting by changing OLDLINE to link to TARGET
+# from LINKNAME, instead of linking to OLDTARGET from LINKNAME.
+# Align data columns the same as they were in OLDLINE.
+# Also, replace any existing white space followed by comment with COMMENT.
+function make_linkline(oldline, target, linkname, oldtarget, comment, \
+		       oldprefix, oldprefixlen, oldtargettabs, \
+		       replsuffix, targettabs)
+{
+  oldprefix = "Link\t" oldtarget "\t"
+  oldprefixlen = length(oldprefix)
+  if (substr(oldline, 1, oldprefixlen) == oldprefix) {
+    # Use tab stops to preserve LINKNAME's column.
+    replsuffix = substr(oldline, oldprefixlen + 1)
+    sub(/[\t ]*#.*/, "", replsuffix)
+    oldtargettabs = int(length(oldtarget) / 8) + 1
+    targettabs = int(length(target) / 8) + 1
+    for (; targettabs < oldtargettabs; targettabs++) {
+      replsuffix = "\t" replsuffix
+    }
+    for (; oldtargettabs < targettabs && replsuffix ~ /^\t/; targettabs--) {
+      replsuffix = substr(replsuffix, 2)
+    }
+  } else {
+    # Odd format line; don't bother lining up its replacement nicely.
+    replsuffix = linkname
+  }
+  return "Link\t" target "\t" replsuffix comment
+}
+
+/^Link/ && $4 == "#=" && DATAFORM == "vanguard" {
+  $0 = make_linkline($0, $5, $3, $2)
+}
+
+# If a Link line is followed by a Link or Zone line for the same data, comment
+# out the Link line.  This can happen if backzone overrides a Link
+# with a Zone or a different Link.
+/^Zone/ {
+  sub(/^Link/, "#Link", line[linkline[$2]])
+}
+/^Link/ {
+  sub(/^Link/, "#Link", line[linkline[$3]])
+  linkline[$3] = NR
+  linktarget[$3] = $2
+}
+
+{ line[NR] = $0 }
+
+function cut_link_chains_short( \
+			       l, linkname, t, target)
+{
+  for (linkname in linktarget) {
+    target = linktarget[linkname]
+    t = linktarget[target]
+    if (t) {
+      # TARGET is itself a link name.  Replace the line "Link TARGET LINKNAME"
+      # with "Link T LINKNAME #= TARGET", where T is at the end of the chain
+      # of links that LINKNAME points to.
+      while ((u = linktarget[t])) {
+	t = u
+      }
+      l = linkline[linkname]
+      line[l] = make_linkline(line[l], t, linkname, target, "\t#= " target)
+    }
+  }
+}
+
+END {
+  if (DATAFORM != "vanguard") {
+    cut_link_chains_short()
+  }
+  for (i = 1; i <= NR; i++)
+    print line[i]
+}
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zishrink.awk
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zishrink.awk
@@ -0,0 +1,356 @@
+# Convert tzdata source into a smaller version of itself.
+
+# Contributed by Paul Eggert.  This file is in the public domain.
+
+# This is not a general-purpose converter; it is designed for current tzdata.
+# 'zic' should treat this script's output as if it were identical to
+# this script's input.
+
+# Record a hash N for the new name NAME, checking for collisions.
+
+function record_hash(n, name)
+{
+  if (used_hashes[n]) {
+    printf "# ! collision: %s %s\n", used_hashes[n], name
+    exit 1
+  }
+  used_hashes[n] = name
+}
+
+# Return a shortened rule name representing NAME,
+# and record this relationship to the hash table.
+
+function gen_rule_name(name, \
+		       n)
+{
+  # Use a simple mnemonic: the first two letters.
+  n = substr(name, 1, 2)
+  record_hash(n, name)
+  # printf "# %s = %s\n", n, name
+  return n
+}
+
+function prehash_rule_names( \
+			    name)
+{
+  # Rule names are not part of the tzdb API, so substitute shorter
+  # ones.  Shortening them consistently from one release to the next
+  # simplifies comparison of the output.  That being said, the
+  # 1-letter names below are not standardized in any way, and can
+  # change arbitrarily from one release to the next, as the main goal
+  # here is compression not comparison.
+
+  # Abbreviating these rules names to one letter saved the most space
+  # circa 2018e.
+  rule["Arg"] = "A"
+  rule["Brazil"] = "B"
+  rule["Canada"] = "C"
+  rule["Denmark"] = "D"
+  rule["EU"] = "E"
+  rule["France"] = "F"
+  rule["GB-Eire"] = "G"
+  rule["Halifax"] = "H"
+  rule["Italy"] = "I"
+  rule["Jordan"] = "J"
+  rule["Egypt"] = "K" # "Kemet" in ancient Egyptian
+  rule["Libya"] = "L"
+  rule["Morocco"] = "M"
+  rule["Neth"] = "N"
+  rule["Poland"] = "O" # arbitrary
+  rule["Palestine"] = "P"
+  rule["Cuba"] = "Q" # Its start sounds like "Q".
+  rule["Russia"] = "R"
+  rule["Syria"] = "S"
+  rule["Turkey"] = "T"
+  rule["Uruguay"] = "U"
+  rule["Vincennes"] = "V"
+  rule["Winn"] = "W"
+  rule["Mongol"] = "X" # arbitrary
+  rule["NT_YK"] = "Y"
+  rule["Zion"] = "Z"
+  rule["Austria"] = "a"
+  rule["Belgium"] = "b"
+  rule["C-Eur"] = "c"
+  rule["Algeria"] = "d" # country code DZ
+  rule["E-Eur"] = "e"
+  rule["Taiwan"] = "f" # Formosa
+  rule["Greece"] = "g"
+  rule["Hungary"] = "h"
+  rule["Iran"] = "i"
+  rule["StJohns"] = "j"
+  rule["Chatham"] = "k" # arbitrary
+  rule["Lebanon"] = "l"
+  rule["Mexico"] = "m"
+  rule["Tunisia"] = "n" # country code TN
+  rule["Moncton"] = "o" # arbitrary
+  rule["Port"] = "p"
+  rule["Albania"] = "q" # arbitrary
+  rule["Regina"] = "r"
+  rule["Spain"] = "s"
+  rule["Toronto"] = "t"
+  rule["US"] = "u"
+  rule["Louisville"] = "v" # ville
+  rule["Iceland"] = "w" # arbitrary
+  rule["Chile"] = "x" # arbitrary
+  rule["Para"] = "y" # country code PY
+  rule["Romania"] = "z" # arbitrary
+  rule["Macau"] = "_" # arbitrary
+
+  # Use ISO 3166 alpha-2 country codes for remaining names that are countries.
+  # This is more systematic, and avoids collisions (e.g., Malta and Moldova).
+  rule["Armenia"] = "AM"
+  rule["Aus"] = "AU"
+  rule["Azer"] = "AZ"
+  rule["Barb"] = "BB"
+  rule["Dhaka"] = "BD"
+  rule["Bulg"] = "BG"
+  rule["Bahamas"] = "BS"
+  rule["Belize"] = "BZ"
+  rule["Swiss"] = "CH"
+  rule["Cook"] = "CK"
+  rule["PRC"] = "CN"
+  rule["Cyprus"] = "CY"
+  rule["Czech"] = "CZ"
+  rule["Germany"] = "DE"
+  rule["DR"] = "DO"
+  rule["Ecuador"] = "EC"
+  rule["Finland"] = "FI"
+  rule["Fiji"] = "FJ"
+  rule["Falk"] = "FK"
+  rule["Ghana"] = "GH"
+  rule["Guat"] = "GT"
+  rule["Hond"] = "HN"
+  rule["Haiti"] = "HT"
+  rule["Eire"] = "IE"
+  rule["Iraq"] = "IQ"
+  rule["Japan"] = "JP"
+  rule["Kyrgyz"] = "KG"
+  rule["ROK"] = "KR"
+  rule["Latvia"] = "LV"
+  rule["Lux"] = "LX"
+  rule["Moldova"] = "MD"
+  rule["Malta"] = "MT"
+  rule["Mauritius"] = "MU"
+  rule["Namibia"] = "NA"
+  rule["Nic"] = "NI"
+  rule["Norway"] = "NO"
+  rule["Peru"] = "PE"
+  rule["Phil"] = "PH"
+  rule["Pakistan"] = "PK"
+  rule["Sudan"] = "SD"
+  rule["Salv"] = "SV"
+  rule["Tonga"] = "TO"
+  rule["Vanuatu"] = "VU"
+
+  # Avoid collisions.
+  rule["Detroit"] = "Dt" # De = Denver
+
+  for (name in rule) {
+    record_hash(rule[name], name)
+  }
+}
+
+function make_line(n, field, \
+		   f, r)
+{
+  r = field[1]
+  for (f = 2; f <= n; f++)
+    r = r " " field[f]
+  return r
+}
+
+# Process the input line LINE and save it for later output.
+
+function process_input_line(line, \
+			    f, field, end, i, n, r, startdef, \
+			    linkline, ruleline, zoneline)
+{
+  # Remove comments, normalize spaces, and append a space to each line.
+  sub(/#.*/, "", line)
+  line = line " "
+  gsub(/[\t ]+/, " ", line)
+
+  # Abbreviate keywords and determine line type.
+  linkline = sub(/^Link /, "L ", line)
+  ruleline = sub(/^Rule /, "R ", line)
+  zoneline = sub(/^Zone /, "Z ", line)
+
+  # Replace FooAsia rules with the same rules without "Asia", as they
+  # are duplicates.
+  if (match(line, /[^ ]Asia /)) {
+    if (ruleline) return
+    line = substr(line, 1, RSTART) substr(line, RSTART + 5)
+  }
+
+  # Abbreviate times.
+  while (match(line, /[: ]0+[0-9]/))
+    line = substr(line, 1, RSTART) substr(line, RSTART + RLENGTH - 1)
+  while (match(line, /:0[^:]/))
+    line = substr(line, 1, RSTART - 1) substr(line, RSTART + 2)
+
+  # Abbreviate weekday names.
+  while (match(line, / (last)?(Mon|Wed|Fri)[ <>]/)) {
+    end = RSTART + RLENGTH
+    line = substr(line, 1, end - 4) substr(line, end - 1)
+  }
+  while (match(line, / (last)?(Sun|Tue|Thu|Sat)[ <>]/)) {
+    end = RSTART + RLENGTH
+    line = substr(line, 1, end - 3) substr(line, end - 1)
+  }
+
+  # Abbreviate "max", "min", "only" and month names.
+  gsub(/ max /, " ma ", line)
+  gsub(/ min /, " mi ", line)
+  gsub(/ only /, " o ", line)
+  gsub(/ Jan /, " Ja ", line)
+  gsub(/ Feb /, " F ", line)
+  gsub(/ Apr /, " Ap ", line)
+  gsub(/ Aug /, " Au ", line)
+  gsub(/ Sep /, " S ", line)
+  gsub(/ Oct /, " O ", line)
+  gsub(/ Nov /, " N ", line)
+  gsub(/ Dec /, " D ", line)
+
+  # Strip leading and trailing space.
+  sub(/^ /, "", line)
+  sub(/ $/, "", line)
+
+  # Remove unnecessary trailing zero fields.
+  sub(/ 0+$/, "", line)
+
+  # Remove unnecessary trailing days-of-month "1".
+  if (match(line, /[A-Za-z] 1$/))
+    line = substr(line, 1, RSTART)
+
+  # Remove unnecessary trailing " Ja" (for January).
+  sub(/ Ja$/, "", line)
+
+  n = split(line, field)
+
+  # Record which rule names are used, and generate their abbreviations.
+  f = zoneline ? 4 : linkline || ruleline ? 0 : 2
+  r = field[f]
+  if (r ~ /^[^-+0-9]/) {
+    rule_used[r] = 1
+  }
+
+  # If this zone supersedes an earlier one, delete the earlier one
+  # from the saved output lines.
+  startdef = ""
+  if (zoneline)
+    zonename = startdef = field[2]
+  else if (linkline)
+    zonename = startdef = field[3]
+  else if (ruleline)
+    zonename = ""
+  if (startdef) {
+    i = zonedef[startdef]
+    if (i) {
+      do
+	output_line[i - 1] = ""
+      while (output_line[i++] ~ /^[-+0-9]/);
+    }
+  }
+  zonedef[zonename] = nout + 1
+
+  # Save the line for later output.
+  output_line[nout++] = make_line(n, field)
+}
+
+function omit_unused_rules( \
+			   i, field)
+{
+  for (i = 0; i < nout; i++) {
+    split(output_line[i], field)
+    if (field[1] == "R" && !rule_used[field[2]]) {
+      output_line[i] = ""
+    }
+  }
+}
+
+function abbreviate_rule_names( \
+			       abbr, f, field, i, n, r)
+{
+  for (i = 0; i < nout; i++) {
+    n = split(output_line[i], field)
+    if (n) {
+      f = field[1] == "Z" ? 4 : field[1] == "L" ? 0 : 2
+      r = field[f]
+      if (r ~ /^[^-+0-9]/) {
+	abbr = rule[r]
+	if (!abbr) {
+	  rule[r] = abbr = gen_rule_name(r)
+	}
+	field[f] = abbr
+	output_line[i] = make_line(n, field)
+      }
+    }
+  }
+}
+
+function output_saved_lines( \
+			    i)
+{
+  for (i = 0; i < nout; i++)
+    if (output_line[i])
+      print output_line[i]
+}
+
+BEGIN {
+  # Files that the output normally depends on.
+  default_dep["africa"] = 1
+  default_dep["antarctica"] = 1
+  default_dep["asia"] = 1
+  default_dep["australasia"] = 1
+  default_dep["backward"] = 1
+  default_dep["etcetera"] = 1
+  default_dep["europe"] = 1
+  default_dep["factory"] = 1
+  default_dep["northamerica"] = 1
+  default_dep["southamerica"] = 1
+  default_dep["ziguard.awk"] = 1
+  default_dep["zishrink.awk"] = 1
+
+  # Output a version string from 'version' and related configuration variables
+  # supported by tzdb's Makefile.  If you change the makefile or any other files
+  # that affect the output of this script, you should append '-SOMETHING'
+  # to the contents of 'version', where SOMETHING identifies what was changed.
+
+  ndeps = split(deps, dep)
+  ddeps = ""
+  for (i = 1; i <= ndeps; i++) {
+    if (default_dep[dep[i]]) {
+      default_dep[dep[i]]++
+    } else {
+      ddeps = ddeps " " dep[i]
+    }
+  }
+  for (d in default_dep) {
+    if (default_dep[d] == 1) {
+      ddeps = ddeps " !" d
+    }
+  }
+  print "# version", version
+  if (dataform != "main") {
+    print "# dataform", dataform
+  }
+  if (redo != "posix_right") {
+    print "# redo " redo
+  }
+  if (ddeps) {
+    print "# ddeps" ddeps
+  }
+  print "# This zic input file is in the public domain."
+
+  prehash_rule_names()
+}
+
+/^[\t ]*[^#\t ]/ {
+  process_input_line($0)
+}
+
+END {
+  omit_unused_rules()
+  abbreviate_rule_names()
+  output_saved_lines()
+}
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zone.tab
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zone.tab
@@ -0,0 +1,449 @@
+# tzdb timezone descriptions (deprecated version)
+#
+# This file is in the public domain, so clarified as of
+# 2009-05-17 by Arthur David Olson.
+#
+# From Paul Eggert (2021-09-20):
+# This file is intended as a backward-compatibility aid for older programs.
+# New programs should use zone1970.tab.  This file is like zone1970.tab (see
+# zone1970.tab's comments), but with the following additional restrictions:
+#
+# 1.  This file contains only ASCII characters.
+# 2.  The first data column contains exactly one country code.
+#
+# Because of (2), each row stands for an area that is the intersection
+# of a region identified by a country code and of a timezone where civil
+# clocks have agreed since 1970; this is a narrower definition than
+# that of zone1970.tab.
+#
+# Unlike zone1970.tab, a row's third column can be a Link from
+# 'backward' instead of a Zone.
+#
+# This table is intended as an aid for users, to help them select timezones
+# appropriate for their practical needs.  It is not intended to take or
+# endorse any position on legal or territorial claims.
+#
+#country-
+#code	coordinates	TZ			comments
+AD	+4230+00131	Europe/Andorra
+AE	+2518+05518	Asia/Dubai
+AF	+3431+06912	Asia/Kabul
+AG	+1703-06148	America/Antigua
+AI	+1812-06304	America/Anguilla
+AL	+4120+01950	Europe/Tirane
+AM	+4011+04430	Asia/Yerevan
+AO	-0848+01314	Africa/Luanda
+AQ	-7750+16636	Antarctica/McMurdo	New Zealand time - McMurdo, South Pole
+AQ	-6617+11031	Antarctica/Casey	Casey
+AQ	-6835+07758	Antarctica/Davis	Davis
+AQ	-6640+14001	Antarctica/DumontDUrville	Dumont-d'Urville
+AQ	-6736+06253	Antarctica/Mawson	Mawson
+AQ	-6448-06406	Antarctica/Palmer	Palmer
+AQ	-6734-06808	Antarctica/Rothera	Rothera
+AQ	-690022+0393524	Antarctica/Syowa	Syowa
+AQ	-720041+0023206	Antarctica/Troll	Troll
+AQ	-7824+10654	Antarctica/Vostok	Vostok
+AR	-3436-05827	America/Argentina/Buenos_Aires	Buenos Aires (BA, CF)
+AR	-3124-06411	America/Argentina/Cordoba	Argentina (most areas: CB, CC, CN, ER, FM, MN, SE, SF)
+AR	-2447-06525	America/Argentina/Salta	Salta (SA, LP, NQ, RN)
+AR	-2411-06518	America/Argentina/Jujuy	Jujuy (JY)
+AR	-2649-06513	America/Argentina/Tucuman	Tucuman (TM)
+AR	-2828-06547	America/Argentina/Catamarca	Catamarca (CT); Chubut (CH)
+AR	-2926-06651	America/Argentina/La_Rioja	La Rioja (LR)
+AR	-3132-06831	America/Argentina/San_Juan	San Juan (SJ)
+AR	-3253-06849	America/Argentina/Mendoza	Mendoza (MZ)
+AR	-3319-06621	America/Argentina/San_Luis	San Luis (SL)
+AR	-5138-06913	America/Argentina/Rio_Gallegos	Santa Cruz (SC)
+AR	-5448-06818	America/Argentina/Ushuaia	Tierra del Fuego (TF)
+AS	-1416-17042	Pacific/Pago_Pago
+AT	+4813+01620	Europe/Vienna
+AU	-3133+15905	Australia/Lord_Howe	Lord Howe Island
+AU	-5430+15857	Antarctica/Macquarie	Macquarie Island
+AU	-4253+14719	Australia/Hobart	Tasmania
+AU	-3749+14458	Australia/Melbourne	Victoria
+AU	-3352+15113	Australia/Sydney	New South Wales (most areas)
+AU	-3157+14127	Australia/Broken_Hill	New South Wales (Yancowinna)
+AU	-2728+15302	Australia/Brisbane	Queensland (most areas)
+AU	-2016+14900	Australia/Lindeman	Queensland (Whitsunday Islands)
+AU	-3455+13835	Australia/Adelaide	South Australia
+AU	-1228+13050	Australia/Darwin	Northern Territory
+AU	-3157+11551	Australia/Perth	Western Australia (most areas)
+AU	-3143+12852	Australia/Eucla	Western Australia (Eucla)
+AW	+1230-06958	America/Aruba
+AX	+6006+01957	Europe/Mariehamn
+AZ	+4023+04951	Asia/Baku
+BA	+4352+01825	Europe/Sarajevo
+BB	+1306-05937	America/Barbados
+BD	+2343+09025	Asia/Dhaka
+BE	+5050+00420	Europe/Brussels
+BF	+1222-00131	Africa/Ouagadougou
+BG	+4241+02319	Europe/Sofia
+BH	+2623+05035	Asia/Bahrain
+BI	-0323+02922	Africa/Bujumbura
+BJ	+0629+00237	Africa/Porto-Novo
+BL	+1753-06251	America/St_Barthelemy
+BM	+3217-06446	Atlantic/Bermuda
+BN	+0456+11455	Asia/Brunei
+BO	-1630-06809	America/La_Paz
+BQ	+120903-0681636	America/Kralendijk
+BR	-0351-03225	America/Noronha	Atlantic islands
+BR	-0127-04829	America/Belem	Para (east); Amapa
+BR	-0343-03830	America/Fortaleza	Brazil (northeast: MA, PI, CE, RN, PB)
+BR	-0803-03454	America/Recife	Pernambuco
+BR	-0712-04812	America/Araguaina	Tocantins
+BR	-0940-03543	America/Maceio	Alagoas, Sergipe
+BR	-1259-03831	America/Bahia	Bahia
+BR	-2332-04637	America/Sao_Paulo	Brazil (southeast: GO, DF, MG, ES, RJ, SP, PR, SC, RS)
+BR	-2027-05437	America/Campo_Grande	Mato Grosso do Sul
+BR	-1535-05605	America/Cuiaba	Mato Grosso
+BR	-0226-05452	America/Santarem	Para (west)
+BR	-0846-06354	America/Porto_Velho	Rondonia
+BR	+0249-06040	America/Boa_Vista	Roraima
+BR	-0308-06001	America/Manaus	Amazonas (east)
+BR	-0640-06952	America/Eirunepe	Amazonas (west)
+BR	-0958-06748	America/Rio_Branco	Acre
+BS	+2505-07721	America/Nassau
+BT	+2728+08939	Asia/Thimphu
+BW	-2439+02555	Africa/Gaborone
+BY	+5354+02734	Europe/Minsk
+BZ	+1730-08812	America/Belize
+CA	+4734-05243	America/St_Johns	Newfoundland; Labrador (southeast)
+CA	+4439-06336	America/Halifax	Atlantic - NS (most areas); PE
+CA	+4612-05957	America/Glace_Bay	Atlantic - NS (Cape Breton)
+CA	+4606-06447	America/Moncton	Atlantic - New Brunswick
+CA	+5320-06025	America/Goose_Bay	Atlantic - Labrador (most areas)
+CA	+5125-05707	America/Blanc-Sablon	AST - QC (Lower North Shore)
+CA	+4339-07923	America/Toronto	Eastern - ON, QC (most areas)
+CA	+6344-06828	America/Iqaluit	Eastern - NU (most areas)
+CA	+484531-0913718	America/Atikokan	EST - ON (Atikokan); NU (Coral H)
+CA	+4953-09709	America/Winnipeg	Central - ON (west); Manitoba
+CA	+744144-0944945	America/Resolute	Central - NU (Resolute)
+CA	+624900-0920459	America/Rankin_Inlet	Central - NU (central)
+CA	+5024-10439	America/Regina	CST - SK (most areas)
+CA	+5017-10750	America/Swift_Current	CST - SK (midwest)
+CA	+5333-11328	America/Edmonton	Mountain - AB; BC (E); SK (W)
+CA	+690650-1050310	America/Cambridge_Bay	Mountain - NU (west)
+CA	+6227-11421	America/Yellowknife	Mountain - NT (central)
+CA	+682059-1334300	America/Inuvik	Mountain - NT (west)
+CA	+4906-11631	America/Creston	MST - BC (Creston)
+CA	+5546-12014	America/Dawson_Creek	MST - BC (Dawson Cr, Ft St John)
+CA	+5848-12242	America/Fort_Nelson	MST - BC (Ft Nelson)
+CA	+6043-13503	America/Whitehorse	MST - Yukon (east)
+CA	+6404-13925	America/Dawson	MST - Yukon (west)
+CA	+4916-12307	America/Vancouver	Pacific - BC (most areas)
+CC	-1210+09655	Indian/Cocos
+CD	-0418+01518	Africa/Kinshasa	Dem. Rep. of Congo (west)
+CD	-1140+02728	Africa/Lubumbashi	Dem. Rep. of Congo (east)
+CF	+0422+01835	Africa/Bangui
+CG	-0416+01517	Africa/Brazzaville
+CH	+4723+00832	Europe/Zurich
+CI	+0519-00402	Africa/Abidjan
+CK	-2114-15946	Pacific/Rarotonga
+CL	-3327-07040	America/Santiago	Chile (most areas)
+CL	-5309-07055	America/Punta_Arenas	Region of Magallanes
+CL	-2709-10926	Pacific/Easter	Easter Island
+CM	+0403+00942	Africa/Douala
+CN	+3114+12128	Asia/Shanghai	Beijing Time
+CN	+4348+08735	Asia/Urumqi	Xinjiang Time
+CO	+0436-07405	America/Bogota
+CR	+0956-08405	America/Costa_Rica
+CU	+2308-08222	America/Havana
+CV	+1455-02331	Atlantic/Cape_Verde
+CW	+1211-06900	America/Curacao
+CX	-1025+10543	Indian/Christmas
+CY	+3510+03322	Asia/Nicosia	Cyprus (most areas)
+CY	+3507+03357	Asia/Famagusta	Northern Cyprus
+CZ	+5005+01426	Europe/Prague
+DE	+5230+01322	Europe/Berlin	Germany (most areas)
+DE	+4742+00841	Europe/Busingen	Busingen
+DJ	+1136+04309	Africa/Djibouti
+DK	+5540+01235	Europe/Copenhagen
+DM	+1518-06124	America/Dominica
+DO	+1828-06954	America/Santo_Domingo
+DZ	+3647+00303	Africa/Algiers
+EC	-0210-07950	America/Guayaquil	Ecuador (mainland)
+EC	-0054-08936	Pacific/Galapagos	Galapagos Islands
+EE	+5925+02445	Europe/Tallinn
+EG	+3003+03115	Africa/Cairo
+EH	+2709-01312	Africa/El_Aaiun
+ER	+1520+03853	Africa/Asmara
+ES	+4024-00341	Europe/Madrid	Spain (mainland)
+ES	+3553-00519	Africa/Ceuta	Ceuta, Melilla
+ES	+2806-01524	Atlantic/Canary	Canary Islands
+ET	+0902+03842	Africa/Addis_Ababa
+FI	+6010+02458	Europe/Helsinki
+FJ	-1808+17825	Pacific/Fiji
+FK	-5142-05751	Atlantic/Stanley
+FM	+0725+15147	Pacific/Chuuk	Chuuk/Truk, Yap
+FM	+0658+15813	Pacific/Pohnpei	Pohnpei/Ponape
+FM	+0519+16259	Pacific/Kosrae	Kosrae
+FO	+6201-00646	Atlantic/Faroe
+FR	+4852+00220	Europe/Paris
+GA	+0023+00927	Africa/Libreville
+GB	+513030-0000731	Europe/London
+GD	+1203-06145	America/Grenada
+GE	+4143+04449	Asia/Tbilisi
+GF	+0456-05220	America/Cayenne
+GG	+492717-0023210	Europe/Guernsey
+GH	+0533-00013	Africa/Accra
+GI	+3608-00521	Europe/Gibraltar
+GL	+6411-05144	America/Nuuk	Greenland (most areas)
+GL	+7646-01840	America/Danmarkshavn	National Park (east coast)
+GL	+7029-02158	America/Scoresbysund	Scoresbysund/Ittoqqortoormiit
+GL	+7634-06847	America/Thule	Thule/Pituffik
+GM	+1328-01639	Africa/Banjul
+GN	+0931-01343	Africa/Conakry
+GP	+1614-06132	America/Guadeloupe
+GQ	+0345+00847	Africa/Malabo
+GR	+3758+02343	Europe/Athens
+GS	-5416-03632	Atlantic/South_Georgia
+GT	+1438-09031	America/Guatemala
+GU	+1328+14445	Pacific/Guam
+GW	+1151-01535	Africa/Bissau
+GY	+0648-05810	America/Guyana
+HK	+2217+11409	Asia/Hong_Kong
+HN	+1406-08713	America/Tegucigalpa
+HR	+4548+01558	Europe/Zagreb
+HT	+1832-07220	America/Port-au-Prince
+HU	+4730+01905	Europe/Budapest
+ID	-0610+10648	Asia/Jakarta	Java, Sumatra
+ID	-0002+10920	Asia/Pontianak	Borneo (west, central)
+ID	-0507+11924	Asia/Makassar	Borneo (east, south); Sulawesi/Celebes, Bali, Nusa Tengarra; Timor (west)
+ID	-0232+14042	Asia/Jayapura	New Guinea (West Papua / Irian Jaya); Malukus/Moluccas
+IE	+5320-00615	Europe/Dublin
+IL	+314650+0351326	Asia/Jerusalem
+IM	+5409-00428	Europe/Isle_of_Man
+IN	+2232+08822	Asia/Kolkata
+IO	-0720+07225	Indian/Chagos
+IQ	+3321+04425	Asia/Baghdad
+IR	+3540+05126	Asia/Tehran
+IS	+6409-02151	Atlantic/Reykjavik
+IT	+4154+01229	Europe/Rome
+JE	+491101-0020624	Europe/Jersey
+JM	+175805-0764736	America/Jamaica
+JO	+3157+03556	Asia/Amman
+JP	+353916+1394441	Asia/Tokyo
+KE	-0117+03649	Africa/Nairobi
+KG	+4254+07436	Asia/Bishkek
+KH	+1133+10455	Asia/Phnom_Penh
+KI	+0125+17300	Pacific/Tarawa	Gilbert Islands
+KI	-0247-17143	Pacific/Kanton	Phoenix Islands
+KI	+0152-15720	Pacific/Kiritimati	Line Islands
+KM	-1141+04316	Indian/Comoro
+KN	+1718-06243	America/St_Kitts
+KP	+3901+12545	Asia/Pyongyang
+KR	+3733+12658	Asia/Seoul
+KW	+2920+04759	Asia/Kuwait
+KY	+1918-08123	America/Cayman
+KZ	+4315+07657	Asia/Almaty	Kazakhstan (most areas)
+KZ	+4448+06528	Asia/Qyzylorda	Qyzylorda/Kyzylorda/Kzyl-Orda
+KZ	+5312+06337	Asia/Qostanay	Qostanay/Kostanay/Kustanay
+KZ	+5017+05710	Asia/Aqtobe	Aqtobe/Aktobe
+KZ	+4431+05016	Asia/Aqtau	Mangghystau/Mankistau
+KZ	+4707+05156	Asia/Atyrau	Atyrau/Atirau/Gur'yev
+KZ	+5113+05121	Asia/Oral	West Kazakhstan
+LA	+1758+10236	Asia/Vientiane
+LB	+3353+03530	Asia/Beirut
+LC	+1401-06100	America/St_Lucia
+LI	+4709+00931	Europe/Vaduz
+LK	+0656+07951	Asia/Colombo
+LR	+0618-01047	Africa/Monrovia
+LS	-2928+02730	Africa/Maseru
+LT	+5441+02519	Europe/Vilnius
+LU	+4936+00609	Europe/Luxembourg
+LV	+5657+02406	Europe/Riga
+LY	+3254+01311	Africa/Tripoli
+MA	+3339-00735	Africa/Casablanca
+MC	+4342+00723	Europe/Monaco
+MD	+4700+02850	Europe/Chisinau
+ME	+4226+01916	Europe/Podgorica
+MF	+1804-06305	America/Marigot
+MG	-1855+04731	Indian/Antananarivo
+MH	+0709+17112	Pacific/Majuro	Marshall Islands (most areas)
+MH	+0905+16720	Pacific/Kwajalein	Kwajalein
+MK	+4159+02126	Europe/Skopje
+ML	+1239-00800	Africa/Bamako
+MM	+1647+09610	Asia/Yangon
+MN	+4755+10653	Asia/Ulaanbaatar	Mongolia (most areas)
+MN	+4801+09139	Asia/Hovd	Bayan-Olgiy, Govi-Altai, Hovd, Uvs, Zavkhan
+MN	+4804+11430	Asia/Choibalsan	Dornod, Sukhbaatar
+MO	+221150+1133230	Asia/Macau
+MP	+1512+14545	Pacific/Saipan
+MQ	+1436-06105	America/Martinique
+MR	+1806-01557	Africa/Nouakchott
+MS	+1643-06213	America/Montserrat
+MT	+3554+01431	Europe/Malta
+MU	-2010+05730	Indian/Mauritius
+MV	+0410+07330	Indian/Maldives
+MW	-1547+03500	Africa/Blantyre
+MX	+1924-09909	America/Mexico_City	Central Mexico
+MX	+2105-08646	America/Cancun	Quintana Roo
+MX	+2058-08937	America/Merida	Campeche, Yucatan
+MX	+2540-10019	America/Monterrey	Durango; Coahuila, Nuevo Leon, Tamaulipas (most areas)
+MX	+2550-09730	America/Matamoros	Coahuila, Nuevo Leon, Tamaulipas (US border)
+MX	+2838-10605	America/Chihuahua	Chihuahua (most areas)
+MX	+3144-10629	America/Ciudad_Juarez	Chihuahua (US border - west)
+MX	+2934-10425	America/Ojinaga	Chihuahua (US border - east)
+MX	+2313-10625	America/Mazatlan	Baja California Sur, Nayarit (most areas), Sinaloa
+MX	+2048-10515	America/Bahia_Banderas	Bahia de Banderas
+MX	+2904-11058	America/Hermosillo	Sonora
+MX	+3232-11701	America/Tijuana	Baja California
+MY	+0310+10142	Asia/Kuala_Lumpur	Malaysia (peninsula)
+MY	+0133+11020	Asia/Kuching	Sabah, Sarawak
+MZ	-2558+03235	Africa/Maputo
+NA	-2234+01706	Africa/Windhoek
+NC	-2216+16627	Pacific/Noumea
+NE	+1331+00207	Africa/Niamey
+NF	-2903+16758	Pacific/Norfolk
+NG	+0627+00324	Africa/Lagos
+NI	+1209-08617	America/Managua
+NL	+5222+00454	Europe/Amsterdam
+NO	+5955+01045	Europe/Oslo
+NP	+2743+08519	Asia/Kathmandu
+NR	-0031+16655	Pacific/Nauru
+NU	-1901-16955	Pacific/Niue
+NZ	-3652+17446	Pacific/Auckland	New Zealand (most areas)
+NZ	-4357-17633	Pacific/Chatham	Chatham Islands
+OM	+2336+05835	Asia/Muscat
+PA	+0858-07932	America/Panama
+PE	-1203-07703	America/Lima
+PF	-1732-14934	Pacific/Tahiti	Society Islands
+PF	-0900-13930	Pacific/Marquesas	Marquesas Islands
+PF	-2308-13457	Pacific/Gambier	Gambier Islands
+PG	-0930+14710	Pacific/Port_Moresby	Papua New Guinea (most areas)
+PG	-0613+15534	Pacific/Bougainville	Bougainville
+PH	+1435+12100	Asia/Manila
+PK	+2452+06703	Asia/Karachi
+PL	+5215+02100	Europe/Warsaw
+PM	+4703-05620	America/Miquelon
+PN	-2504-13005	Pacific/Pitcairn
+PR	+182806-0660622	America/Puerto_Rico
+PS	+3130+03428	Asia/Gaza	Gaza Strip
+PS	+313200+0350542	Asia/Hebron	West Bank
+PT	+3843-00908	Europe/Lisbon	Portugal (mainland)
+PT	+3238-01654	Atlantic/Madeira	Madeira Islands
+PT	+3744-02540	Atlantic/Azores	Azores
+PW	+0720+13429	Pacific/Palau
+PY	-2516-05740	America/Asuncion
+QA	+2517+05132	Asia/Qatar
+RE	-2052+05528	Indian/Reunion
+RO	+4426+02606	Europe/Bucharest
+RS	+4450+02030	Europe/Belgrade
+RU	+5443+02030	Europe/Kaliningrad	MSK-01 - Kaliningrad
+RU	+554521+0373704	Europe/Moscow	MSK+00 - Moscow area
+# The obsolescent zone.tab format cannot represent Europe/Simferopol well.
+# Put it in RU section and list as UA.  See "territorial claims" above.
+# Programs should use zone1970.tab instead; see above.
+UA	+4457+03406	Europe/Simferopol	Crimea
+RU	+5836+04939	Europe/Kirov	MSK+00 - Kirov
+RU	+4844+04425	Europe/Volgograd	MSK+00 - Volgograd
+RU	+4621+04803	Europe/Astrakhan	MSK+01 - Astrakhan
+RU	+5134+04602	Europe/Saratov	MSK+01 - Saratov
+RU	+5420+04824	Europe/Ulyanovsk	MSK+01 - Ulyanovsk
+RU	+5312+05009	Europe/Samara	MSK+01 - Samara, Udmurtia
+RU	+5651+06036	Asia/Yekaterinburg	MSK+02 - Urals
+RU	+5500+07324	Asia/Omsk	MSK+03 - Omsk
+RU	+5502+08255	Asia/Novosibirsk	MSK+04 - Novosibirsk
+RU	+5322+08345	Asia/Barnaul	MSK+04 - Altai
+RU	+5630+08458	Asia/Tomsk	MSK+04 - Tomsk
+RU	+5345+08707	Asia/Novokuznetsk	MSK+04 - Kemerovo
+RU	+5601+09250	Asia/Krasnoyarsk	MSK+04 - Krasnoyarsk area
+RU	+5216+10420	Asia/Irkutsk	MSK+05 - Irkutsk, Buryatia
+RU	+5203+11328	Asia/Chita	MSK+06 - Zabaykalsky
+RU	+6200+12940	Asia/Yakutsk	MSK+06 - Lena River
+RU	+623923+1353314	Asia/Khandyga	MSK+06 - Tomponsky, Ust-Maysky
+RU	+4310+13156	Asia/Vladivostok	MSK+07 - Amur River
+RU	+643337+1431336	Asia/Ust-Nera	MSK+07 - Oymyakonsky
+RU	+5934+15048	Asia/Magadan	MSK+08 - Magadan
+RU	+4658+14242	Asia/Sakhalin	MSK+08 - Sakhalin Island
+RU	+6728+15343	Asia/Srednekolymsk	MSK+08 - Sakha (E); North Kuril Is
+RU	+5301+15839	Asia/Kamchatka	MSK+09 - Kamchatka
+RU	+6445+17729	Asia/Anadyr	MSK+09 - Bering Sea
+RW	-0157+03004	Africa/Kigali
+SA	+2438+04643	Asia/Riyadh
+SB	-0932+16012	Pacific/Guadalcanal
+SC	-0440+05528	Indian/Mahe
+SD	+1536+03232	Africa/Khartoum
+SE	+5920+01803	Europe/Stockholm
+SG	+0117+10351	Asia/Singapore
+SH	-1555-00542	Atlantic/St_Helena
+SI	+4603+01431	Europe/Ljubljana
+SJ	+7800+01600	Arctic/Longyearbyen
+SK	+4809+01707	Europe/Bratislava
+SL	+0830-01315	Africa/Freetown
+SM	+4355+01228	Europe/San_Marino
+SN	+1440-01726	Africa/Dakar
+SO	+0204+04522	Africa/Mogadishu
+SR	+0550-05510	America/Paramaribo
+SS	+0451+03137	Africa/Juba
+ST	+0020+00644	Africa/Sao_Tome
+SV	+1342-08912	America/El_Salvador
+SX	+180305-0630250	America/Lower_Princes
+SY	+3330+03618	Asia/Damascus
+SZ	-2618+03106	Africa/Mbabane
+TC	+2128-07108	America/Grand_Turk
+TD	+1207+01503	Africa/Ndjamena
+TF	-492110+0701303	Indian/Kerguelen
+TG	+0608+00113	Africa/Lome
+TH	+1345+10031	Asia/Bangkok
+TJ	+3835+06848	Asia/Dushanbe
+TK	-0922-17114	Pacific/Fakaofo
+TL	-0833+12535	Asia/Dili
+TM	+3757+05823	Asia/Ashgabat
+TN	+3648+01011	Africa/Tunis
+TO	-210800-1751200	Pacific/Tongatapu
+TR	+4101+02858	Europe/Istanbul
+TT	+1039-06131	America/Port_of_Spain
+TV	-0831+17913	Pacific/Funafuti
+TW	+2503+12130	Asia/Taipei
+TZ	-0648+03917	Africa/Dar_es_Salaam
+UA	+5026+03031	Europe/Kyiv	Ukraine (most areas)
+UG	+0019+03225	Africa/Kampala
+UM	+2813-17722	Pacific/Midway	Midway Islands
+UM	+1917+16637	Pacific/Wake	Wake Island
+US	+404251-0740023	America/New_York	Eastern (most areas)
+US	+421953-0830245	America/Detroit	Eastern - MI (most areas)
+US	+381515-0854534	America/Kentucky/Louisville	Eastern - KY (Louisville area)
+US	+364947-0845057	America/Kentucky/Monticello	Eastern - KY (Wayne)
+US	+394606-0860929	America/Indiana/Indianapolis	Eastern - IN (most areas)
+US	+384038-0873143	America/Indiana/Vincennes	Eastern - IN (Da, Du, K, Mn)
+US	+410305-0863611	America/Indiana/Winamac	Eastern - IN (Pulaski)
+US	+382232-0862041	America/Indiana/Marengo	Eastern - IN (Crawford)
+US	+382931-0871643	America/Indiana/Petersburg	Eastern - IN (Pike)
+US	+384452-0850402	America/Indiana/Vevay	Eastern - IN (Switzerland)
+US	+415100-0873900	America/Chicago	Central (most areas)
+US	+375711-0864541	America/Indiana/Tell_City	Central - IN (Perry)
+US	+411745-0863730	America/Indiana/Knox	Central - IN (Starke)
+US	+450628-0873651	America/Menominee	Central - MI (Wisconsin border)
+US	+470659-1011757	America/North_Dakota/Center	Central - ND (Oliver)
+US	+465042-1012439	America/North_Dakota/New_Salem	Central - ND (Morton rural)
+US	+471551-1014640	America/North_Dakota/Beulah	Central - ND (Mercer)
+US	+394421-1045903	America/Denver	Mountain (most areas)
+US	+433649-1161209	America/Boise	Mountain - ID (south); OR (east)
+US	+332654-1120424	America/Phoenix	MST - Arizona (except Navajo)
+US	+340308-1181434	America/Los_Angeles	Pacific
+US	+611305-1495401	America/Anchorage	Alaska (most areas)
+US	+581807-1342511	America/Juneau	Alaska - Juneau area
+US	+571035-1351807	America/Sitka	Alaska - Sitka area
+US	+550737-1313435	America/Metlakatla	Alaska - Annette Island
+US	+593249-1394338	America/Yakutat	Alaska - Yakutat
+US	+643004-1652423	America/Nome	Alaska (west)
+US	+515248-1763929	America/Adak	Aleutian Islands
+US	+211825-1575130	Pacific/Honolulu	Hawaii
+UY	-345433-0561245	America/Montevideo
+UZ	+3940+06648	Asia/Samarkand	Uzbekistan (west)
+UZ	+4120+06918	Asia/Tashkent	Uzbekistan (east)
+VA	+415408+0122711	Europe/Vatican
+VC	+1309-06114	America/St_Vincent
+VE	+1030-06656	America/Caracas
+VG	+1827-06437	America/Tortola
+VI	+1821-06456	America/St_Thomas
+VN	+1045+10640	Asia/Ho_Chi_Minh
+VU	-1740+16825	Pacific/Efate
+WF	-1318-17610	Pacific/Wallis
+WS	-1350-17144	Pacific/Apia
+YE	+1245+04512	Asia/Aden
+YT	-1247+04514	Indian/Mayotte
+ZA	-2615+02800	Africa/Johannesburg
+ZM	-1525+02817	Africa/Lusaka
+ZW	-1750+03103	Africa/Harare
--- a/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zone1970.tab
+++ b/externals/nx_tzdb/tzdb_to_nx/externals/tz/tz/zone1970.tab
@@ -0,0 +1,372 @@
+# tzdb timezone descriptions
+#
+# This file is in the public domain.
+#
+# From Paul Eggert (2018-06-27):
+# This file contains a table where each row stands for a timezone where
+# civil timestamps have agreed since 1970.  Columns are separated by
+# a single tab.  Lines beginning with '#' are comments.  All text uses
+# UTF-8 encoding.  The columns of the table are as follows:
+#
+# 1.  The countries that overlap the timezone, as a comma-separated list
+#     of ISO 3166 2-character country codes.  See the file 'iso3166.tab'.
+# 2.  Latitude and longitude of the timezone's principal location
+#     in ISO 6709 sign-degrees-minutes-seconds format,
+#     either ±DDMM±DDDMM or ±DDMMSS±DDDMMSS,
+#     first latitude (+ is north), then longitude (+ is east).
+# 3.  Timezone name used in value of TZ environment variable.
+#     Please see the theory.html file for how these names are chosen.
+#     If multiple timezones overlap a country, each has a row in the
+#     table, with each column 1 containing the country code.
+# 4.  Comments; present if and only if a country has multiple timezones.
+#
+# If a timezone covers multiple countries, the most-populous city is used,
+# and that country is listed first in column 1; any other countries
+# are listed alphabetically by country code.  The table is sorted
+# first by country code, then (if possible) by an order within the
+# country that (1) makes some geographical sense, and (2) puts the
+# most populous timezones first, where that does not contradict (1).
+#
+# This table is intended as an aid for users, to help them select timezones
+# appropriate for their practical needs.  It is not intended to take or
+# endorse any position on legal or territorial claims.
+#
+#country-
+#codes	coordinates	TZ	comments
+AD	+4230+00131	Europe/Andorra
+AE,OM,RE,SC,TF	+2518+05518	Asia/Dubai	UAE, Oman, Réunion, Seychelles, Crozet, Scattered Is
+AF	+3431+06912	Asia/Kabul
+AL	+4120+01950	Europe/Tirane
+AM	+4011+04430	Asia/Yerevan
+AQ	-6617+11031	Antarctica/Casey	Casey
+AQ	-6835+07758	Antarctica/Davis	Davis
+AQ	-6736+06253	Antarctica/Mawson	Mawson
+AQ	-6448-06406	Antarctica/Palmer	Palmer
+AQ	-6734-06808	Antarctica/Rothera	Rothera
+AQ	-720041+0023206	Antarctica/Troll	Troll
+AR	-3436-05827	America/Argentina/Buenos_Aires	Buenos Aires (BA, CF)
+AR	-3124-06411	America/Argentina/Cordoba	Argentina (most areas: CB, CC, CN, ER, FM, MN, SE, SF)
+AR	-2447-06525	America/Argentina/Salta	Salta (SA, LP, NQ, RN)
+AR	-2411-06518	America/Argentina/Jujuy	Jujuy (JY)
+AR	-2649-06513	America/Argentina/Tucuman	Tucumán (TM)
+AR	-2828-06547	America/Argentina/Catamarca	Catamarca (CT); Chubut (CH)
+AR	-2926-06651	America/Argentina/La_Rioja	La Rioja (LR)
+AR	-3132-06831	America/Argentina/San_Juan	San Juan (SJ)
+AR	-3253-06849	America/Argentina/Mendoza	Mendoza (MZ)
+AR	-3319-06621	America/Argentina/San_Luis	San Luis (SL)
+AR	-5138-06913	America/Argentina/Rio_Gallegos	Santa Cruz (SC)
+AR	-5448-06818	America/Argentina/Ushuaia	Tierra del Fuego (TF)
+AS,UM	-1416-17042	Pacific/Pago_Pago	Samoa, Midway
+AT	+4813+01620	Europe/Vienna
+AU	-3133+15905	Australia/Lord_Howe	Lord Howe Island
+AU	-5430+15857	Antarctica/Macquarie	Macquarie Island
+AU	-4253+14719	Australia/Hobart	Tasmania
+AU	-3749+14458	Australia/Melbourne	Victoria
+AU	-3352+15113	Australia/Sydney	New South Wales (most areas)
+AU	-3157+14127	Australia/Broken_Hill	New South Wales (Yancowinna)
+AU	-2728+15302	Australia/Brisbane	Queensland (most areas)
+AU	-2016+14900	Australia/Lindeman	Queensland (Whitsunday Islands)
+AU	-3455+13835	Australia/Adelaide	South Australia
+AU	-1228+13050	Australia/Darwin	Northern Territory
+AU	-3157+11551	Australia/Perth	Western Australia (most areas)
+AU	-3143+12852	Australia/Eucla	Western Australia (Eucla)
+AZ	+4023+04951	Asia/Baku
+BB	+1306-05937	America/Barbados
+BD	+2343+09025	Asia/Dhaka
+BE,LU,NL	+5050+00420	Europe/Brussels
+BG	+4241+02319	Europe/Sofia
+BM	+3217-06446	Atlantic/Bermuda
+BO	-1630-06809	America/La_Paz
+BR	-0351-03225	America/Noronha	Atlantic islands
+BR	-0127-04829	America/Belem	Pará (east); Amapá
+BR	-0343-03830	America/Fortaleza	Brazil (northeast: MA, PI, CE, RN, PB)
+BR	-0803-03454	America/Recife	Pernambuco
+BR	-0712-04812	America/Araguaina	Tocantins
+BR	-0940-03543	America/Maceio	Alagoas, Sergipe
+BR	-1259-03831	America/Bahia	Bahia
+BR	-2332-04637	America/Sao_Paulo	Brazil (southeast: GO, DF, MG, ES, RJ, SP, PR, SC, RS)
+BR	-2027-05437	America/Campo_Grande	Mato Grosso do Sul
+BR	-1535-05605	America/Cuiaba	Mato Grosso
+BR	-0226-05452	America/Santarem	Pará (west)
+BR	-0846-06354	America/Porto_Velho	Rondônia
+BR	+0249-06040	America/Boa_Vista	Roraima
+BR	-0308-06001	America/Manaus	Amazonas (east)
+BR	-0640-06952	America/Eirunepe	Amazonas (west)
+BR	-0958-06748	America/Rio_Branco	Acre
+BT	+2728+08939	Asia/Thimphu
+BY	+5354+02734	Europe/Minsk
+BZ	+1730-08812	America/Belize
+CA	+4734-05243	America/St_Johns	Newfoundland; Labrador (southeast)
+CA	+4439-06336	America/Halifax	Atlantic - NS (most areas); PE
+CA	+4612-05957	America/Glace_Bay	Atlantic - NS (Cape Breton)
+CA	+4606-06447	America/Moncton	Atlantic - New Brunswick
+CA	+5320-06025	America/Goose_Bay	Atlantic - Labrador (most areas)
+CA,BS	+4339-07923	America/Toronto	Eastern - ON, QC (most areas), Bahamas
+CA	+6344-06828	America/Iqaluit	Eastern - NU (most areas)
+CA	+4953-09709	America/Winnipeg	Central - ON (west); Manitoba
+CA	+744144-0944945	America/Resolute	Central - NU (Resolute)
+CA	+624900-0920459	America/Rankin_Inlet	Central - NU (central)
+CA	+5024-10439	America/Regina	CST - SK (most areas)
+CA	+5017-10750	America/Swift_Current	CST - SK (midwest)
+CA	+5333-11328	America/Edmonton	Mountain - AB; BC (E); SK (W)
+CA	+690650-1050310	America/Cambridge_Bay	Mountain - NU (west)
+CA	+6227-11421	America/Yellowknife	Mountain - NT (central)
+CA	+682059-1334300	America/Inuvik	Mountain - NT (west)
+CA	+5546-12014	America/Dawson_Creek	MST - BC (Dawson Cr, Ft St John)
+CA	+5848-12242	America/Fort_Nelson	MST - BC (Ft Nelson)
+CA	+6043-13503	America/Whitehorse	MST - Yukon (east)
+CA	+6404-13925	America/Dawson	MST - Yukon (west)
+CA	+4916-12307	America/Vancouver	Pacific - BC (most areas)
+CH,DE,LI	+4723+00832	Europe/Zurich	Swiss time
+CI,BF,GH,GM,GN,IS,ML,MR,SH,SL,SN,TG	+0519-00402	Africa/Abidjan
+CK	-2114-15946	Pacific/Rarotonga
+CL	-3327-07040	America/Santiago	Chile (most areas)
+CL	-5309-07055	America/Punta_Arenas	Region of Magallanes
+CL	-2709-10926	Pacific/Easter	Easter Island
+CN	+3114+12128	Asia/Shanghai	Beijing Time
+CN,AQ	+4348+08735	Asia/Urumqi	Xinjiang Time, Vostok
+CO	+0436-07405	America/Bogota
+CR	+0956-08405	America/Costa_Rica
+CU	+2308-08222	America/Havana
+CV	+1455-02331	Atlantic/Cape_Verde
+CY	+3510+03322	Asia/Nicosia	Cyprus (most areas)
+CY	+3507+03357	Asia/Famagusta	Northern Cyprus
+CZ,SK	+5005+01426	Europe/Prague
+DE,DK,NO,SE,SJ	+5230+01322	Europe/Berlin	Germany (most areas), Scandinavia
+DO	+1828-06954	America/Santo_Domingo
+DZ	+3647+00303	Africa/Algiers
+EC	-0210-07950	America/Guayaquil	Ecuador (mainland)
+EC	-0054-08936	Pacific/Galapagos	Galápagos Islands
+EE	+5925+02445	Europe/Tallinn
+EG	+3003+03115	Africa/Cairo
+EH	+2709-01312	Africa/El_Aaiun
+ES	+4024-00341	Europe/Madrid	Spain (mainland)
+ES	+3553-00519	Africa/Ceuta	Ceuta, Melilla
+ES	+2806-01524	Atlantic/Canary	Canary Islands
+FI,AX	+6010+02458	Europe/Helsinki
+FJ	-1808+17825	Pacific/Fiji
+FK	-5142-05751	Atlantic/Stanley
+FM	+0519+16259	Pacific/Kosrae	Kosrae
+FO	+6201-00646	Atlantic/Faroe
+FR,MC	+4852+00220	Europe/Paris
+GB,GG,IM,JE	+513030-0000731	Europe/London
+GE	+4143+04449	Asia/Tbilisi
+GF	+0456-05220	America/Cayenne
+GI	+3608-00521	Europe/Gibraltar
+GL	+6411-05144	America/Nuuk	Greenland (most areas)
+GL	+7646-01840	America/Danmarkshavn	National Park (east coast)
+GL	+7029-02158	America/Scoresbysund	Scoresbysund/Ittoqqortoormiit
+GL	+7634-06847	America/Thule	Thule/Pituffik
+GR	+3758+02343	Europe/Athens
+GS	-5416-03632	Atlantic/South_Georgia
+GT	+1438-09031	America/Guatemala
+GU,MP	+1328+14445	Pacific/Guam
+GW	+1151-01535	Africa/Bissau
+GY	+0648-05810	America/Guyana
+HK	+2217+11409	Asia/Hong_Kong
+HN	+1406-08713	America/Tegucigalpa
+HT	+1832-07220	America/Port-au-Prince
+HU	+4730+01905	Europe/Budapest
+ID	-0610+10648	Asia/Jakarta	Java, Sumatra
+ID	-0002+10920	Asia/Pontianak	Borneo (west, central)
+ID	-0507+11924	Asia/Makassar	Borneo (east, south); Sulawesi/Celebes, Bali, Nusa Tengarra; Timor (west)
+ID	-0232+14042	Asia/Jayapura	New Guinea (West Papua / Irian Jaya); Malukus/Moluccas
+IE	+5320-00615	Europe/Dublin
+IL	+314650+0351326	Asia/Jerusalem
+IN	+2232+08822	Asia/Kolkata
+IO	-0720+07225	Indian/Chagos
+IQ	+3321+04425	Asia/Baghdad
+IR	+3540+05126	Asia/Tehran
+IT,SM,VA	+4154+01229	Europe/Rome
+JM	+175805-0764736	America/Jamaica
+JO	+3157+03556	Asia/Amman
+JP	+353916+1394441	Asia/Tokyo
+KE,DJ,ER,ET,KM,MG,SO,TZ,UG,YT	-0117+03649	Africa/Nairobi
+KG	+4254+07436	Asia/Bishkek
+KI,MH,TV,UM,WF	+0125+17300	Pacific/Tarawa	Gilberts, Marshalls, Tuvalu, Wallis & Futuna, Wake
+KI	-0247-17143	Pacific/Kanton	Phoenix Islands
+KI	+0152-15720	Pacific/Kiritimati	Line Islands
+KP	+3901+12545	Asia/Pyongyang
+KR	+3733+12658	Asia/Seoul
+KZ	+4315+07657	Asia/Almaty	Kazakhstan (most areas)
+KZ	+4448+06528	Asia/Qyzylorda	Qyzylorda/Kyzylorda/Kzyl-Orda
+KZ	+5312+06337	Asia/Qostanay	Qostanay/Kostanay/Kustanay
+KZ	+5017+05710	Asia/Aqtobe	Aqtöbe/Aktobe
+KZ	+4431+05016	Asia/Aqtau	Mangghystaū/Mankistau
+KZ	+4707+05156	Asia/Atyrau	Atyraū/Atirau/Gur'yev
+KZ	+5113+05121	Asia/Oral	West Kazakhstan
+LB	+3353+03530	Asia/Beirut
+LK	+0656+07951	Asia/Colombo
+LR	+0618-01047	Africa/Monrovia
+LT	+5441+02519	Europe/Vilnius
+LV	+5657+02406	Europe/Riga
+LY	+3254+01311	Africa/Tripoli
+MA	+3339-00735	Africa/Casablanca
+MD	+4700+02850	Europe/Chisinau
+MH	+0905+16720	Pacific/Kwajalein	Kwajalein
+MM,CC	+1647+09610	Asia/Yangon
+MN	+4755+10653	Asia/Ulaanbaatar	Mongolia (most areas)
+MN	+4801+09139	Asia/Hovd	Bayan-Ölgii, Govi-Altai, Hovd, Uvs, Zavkhan
+MN	+4804+11430	Asia/Choibalsan	Dornod, Sükhbaatar
+MO	+221150+1133230	Asia/Macau
+MQ	+1436-06105	America/Martinique
+MT	+3554+01431	Europe/Malta
+MU	-2010+05730	Indian/Mauritius
+MV,TF	+0410+07330	Indian/Maldives	Maldives, Kerguelen, St Paul I, Amsterdam I
+MX	+1924-09909	America/Mexico_City	Central Mexico
+MX	+2105-08646	America/Cancun	Quintana Roo
+MX	+2058-08937	America/Merida	Campeche, Yucatán
+MX	+2540-10019	America/Monterrey	Durango; Coahuila, Nuevo León, Tamaulipas (most areas)
+MX	+2550-09730	America/Matamoros	Coahuila, Nuevo León, Tamaulipas (US border)
+MX	+2838-10605	America/Chihuahua	Chihuahua (most areas)
+MX	+3144-10629	America/Ciudad_Juarez	Chihuahua (US border - west)
+MX	+2934-10425	America/Ojinaga	Chihuahua (US border - east)
+MX	+2313-10625	America/Mazatlan	Baja California Sur, Nayarit (most areas), Sinaloa
+MX	+2048-10515	America/Bahia_Banderas	Bahía de Banderas
+MX	+2904-11058	America/Hermosillo	Sonora
+MX	+3232-11701	America/Tijuana	Baja California
+MY,BN	+0133+11020	Asia/Kuching	Sabah, Sarawak, Brunei
+MZ,BI,BW,CD,MW,RW,ZM,ZW	-2558+03235	Africa/Maputo	Central Africa Time
+NA	-2234+01706	Africa/Windhoek
+NC	-2216+16627	Pacific/Noumea
+NF	-2903+16758	Pacific/Norfolk
+NG,AO,BJ,CD,CF,CG,CM,GA,GQ,NE	+0627+00324	Africa/Lagos	West Africa Time
+NI	+1209-08617	America/Managua
+NP	+2743+08519	Asia/Kathmandu
+NR	-0031+16655	Pacific/Nauru
+NU	-1901-16955	Pacific/Niue
+NZ,AQ	-3652+17446	Pacific/Auckland	New Zealand time
+NZ	-4357-17633	Pacific/Chatham	Chatham Islands
+PA,CA,KY	+0858-07932	America/Panama	EST - Panama, Cayman, ON (Atikokan), NU (Coral H)
+PE	-1203-07703	America/Lima
+PF	-1732-14934	Pacific/Tahiti	Society Islands
+PF	-0900-13930	Pacific/Marquesas	Marquesas Islands
+PF	-2308-13457	Pacific/Gambier	Gambier Islands
+PG,AQ,FM	-0930+14710	Pacific/Port_Moresby	Papua New Guinea (most areas), Chuuk, Yap, Dumont d'Urville
+PG	-0613+15534	Pacific/Bougainville	Bougainville
+PH	+1435+12100	Asia/Manila
+PK	+2452+06703	Asia/Karachi
+PL	+5215+02100	Europe/Warsaw
+PM	+4703-05620	America/Miquelon
+PN	-2504-13005	Pacific/Pitcairn
+PR,AG,CA,AI,AW,BL,BQ,CW,DM,GD,GP,KN,LC,MF,MS,SX,TT,VC,VG,VI	+182806-0660622	America/Puerto_Rico	AST
+PS	+3130+03428	Asia/Gaza	Gaza Strip
+PS	+313200+0350542	Asia/Hebron	West Bank
+PT	+3843-00908	Europe/Lisbon	Portugal (mainland)
+PT	+3238-01654	Atlantic/Madeira	Madeira Islands
+PT	+3744-02540	Atlantic/Azores	Azores
+PW	+0720+13429	Pacific/Palau
+PY	-2516-05740	America/Asuncion
+QA,BH	+2517+05132	Asia/Qatar
+RO	+4426+02606	Europe/Bucharest
+RS,BA,HR,ME,MK,SI	+4450+02030	Europe/Belgrade
+RU	+5443+02030	Europe/Kaliningrad	MSK-01 - Kaliningrad
+RU	+554521+0373704	Europe/Moscow	MSK+00 - Moscow area
+# Mention RU and UA alphabetically.  See "territorial claims" above.
+RU,UA	+4457+03406	Europe/Simferopol	Crimea
+RU	+5836+04939	Europe/Kirov	MSK+00 - Kirov
+RU	+4844+04425	Europe/Volgograd	MSK+00 - Volgograd
+RU	+4621+04803	Europe/Astrakhan	MSK+01 - Astrakhan
+RU	+5134+04602	Europe/Saratov	MSK+01 - Saratov
+RU	+5420+04824	Europe/Ulyanovsk	MSK+01 - Ulyanovsk
+RU	+5312+05009	Europe/Samara	MSK+01 - Samara, Udmurtia
+RU	+5651+06036	Asia/Yekaterinburg	MSK+02 - Urals
+RU	+5500+07324	Asia/Omsk	MSK+03 - Omsk
+RU	+5502+08255	Asia/Novosibirsk	MSK+04 - Novosibirsk
+RU	+5322+08345	Asia/Barnaul	MSK+04 - Altai
+RU	+5630+08458	Asia/Tomsk	MSK+04 - Tomsk
+RU	+5345+08707	Asia/Novokuznetsk	MSK+04 - Kemerovo
+RU	+5601+09250	Asia/Krasnoyarsk	MSK+04 - Krasnoyarsk area
+RU	+5216+10420	Asia/Irkutsk	MSK+05 - Irkutsk, Buryatia
+RU	+5203+11328	Asia/Chita	MSK+06 - Zabaykalsky
+RU	+6200+12940	Asia/Yakutsk	MSK+06 - Lena River
+RU	+623923+1353314	Asia/Khandyga	MSK+06 - Tomponsky, Ust-Maysky
+RU	+4310+13156	Asia/Vladivostok	MSK+07 - Amur River
+RU	+643337+1431336	Asia/Ust-Nera	MSK+07 - Oymyakonsky
+RU	+5934+15048	Asia/Magadan	MSK+08 - Magadan
+RU	+4658+14242	Asia/Sakhalin	MSK+08 - Sakhalin Island
+RU	+6728+15343	Asia/Srednekolymsk	MSK+08 - Sakha (E); North Kuril Is
+RU	+5301+15839	Asia/Kamchatka	MSK+09 - Kamchatka
+RU	+6445+17729	Asia/Anadyr	MSK+09 - Bering Sea
+SA,AQ,KW,YE	+2438+04643	Asia/Riyadh	Arabia, Syowa
+SB,FM	-0932+16012	Pacific/Guadalcanal	Solomons, Pohnpei
+SD	+1536+03232	Africa/Khartoum
+SG,MY	+0117+10351	Asia/Singapore	Singapore, peninsular Malaysia
+SR	+0550-05510	America/Paramaribo
+SS	+0451+03137	Africa/Juba
+ST	+0020+00644	Africa/Sao_Tome
+SV	+1342-08912	America/El_Salvador
+SY	+3330+03618	Asia/Damascus
+TC	+2128-07108	America/Grand_Turk
+TD	+1207+01503	Africa/Ndjamena
+TH,CX,KH,LA,VN	+1345+10031	Asia/Bangkok	Indochina (most areas)
+TJ	+3835+06848	Asia/Dushanbe
+TK	-0922-17114	Pacific/Fakaofo
+TL	-0833+12535	Asia/Dili
+TM	+3757+05823	Asia/Ashgabat
+TN	+3648+01011	Africa/Tunis
+TO	-210800-1751200	Pacific/Tongatapu
+TR	+4101+02858	Europe/Istanbul
+TW	+2503+12130	Asia/Taipei
+UA	+5026+03031	Europe/Kyiv	Ukraine (most areas)
+US	+404251-0740023	America/New_York	Eastern (most areas)
+US	+421953-0830245	America/Detroit	Eastern - MI (most areas)
+US	+381515-0854534	America/Kentucky/Louisville	Eastern - KY (Louisville area)
+US	+364947-0845057	America/Kentucky/Monticello	Eastern - KY (Wayne)
+US	+394606-0860929	America/Indiana/Indianapolis	Eastern - IN (most areas)
+US	+384038-0873143	America/Indiana/Vincennes	Eastern - IN (Da, Du, K, Mn)
+US	+410305-0863611	America/Indiana/Winamac	Eastern - IN (Pulaski)
+US	+382232-0862041	America/Indiana/Marengo	Eastern - IN (Crawford)
+US	+382931-0871643	America/Indiana/Petersburg	Eastern - IN (Pike)
+US	+384452-0850402	America/Indiana/Vevay	Eastern - IN (Switzerland)
+US	+415100-0873900	America/Chicago	Central (most areas)
+US	+375711-0864541	America/Indiana/Tell_City	Central - IN (Perry)
+US	+411745-0863730	America/Indiana/Knox	Central - IN (Starke)
+US	+450628-0873651	America/Menominee	Central - MI (Wisconsin border)
+US	+470659-1011757	America/North_Dakota/Center	Central - ND (Oliver)
+US	+465042-1012439	America/North_Dakota/New_Salem	Central - ND (Morton rural)
+US	+471551-1014640	America/North_Dakota/Beulah	Central - ND (Mercer)
+US	+394421-1045903	America/Denver	Mountain (most areas)
+US	+433649-1161209	America/Boise	Mountain - ID (south); OR (east)
+US,CA	+332654-1120424	America/Phoenix	MST - Arizona (except Navajo), Creston BC
+US	+340308-1181434	America/Los_Angeles	Pacific
+US	+611305-1495401	America/Anchorage	Alaska (most areas)
+US	+581807-1342511	America/Juneau	Alaska - Juneau area
+US	+571035-1351807	America/Sitka	Alaska - Sitka area
+US	+550737-1313435	America/Metlakatla	Alaska - Annette Island
+US	+593249-1394338	America/Yakutat	Alaska - Yakutat
+US	+643004-1652423	America/Nome	Alaska (west)
+US	+515248-1763929	America/Adak	Aleutian Islands
+US,UM	+211825-1575130	Pacific/Honolulu	Hawaii
+UY	-345433-0561245	America/Montevideo
+UZ	+3940+06648	Asia/Samarkand	Uzbekistan (west)
+UZ	+4120+06918	Asia/Tashkent	Uzbekistan (east)
+VE	+1030-06656	America/Caracas
+VN	+1045+10640	Asia/Ho_Chi_Minh	Vietnam (south)
+VU	-1740+16825	Pacific/Efate
+WS	-1350-17144	Pacific/Apia
+ZA,LS,SZ	-2615+02800	Africa/Johannesburg
+#
+# The next section contains experimental tab-separated comments for
+# use by user agents like tzselect that identify continents and oceans.
+#
+# For example, the comment "#@AQ<tab>Antarctica/" means the country code
+# AQ is in the continent Antarctica regardless of the Zone name,
+# so Pacific/Auckland should be listed under Antarctica as well as
+# under the Pacific because its line's country codes include AQ.
+#
+# If more than one country code is affected each is listed separated
+# by commas, e.g., #@IS,SH<tab>Atlantic/".  If a country code is in
+# more than one continent or ocean, each is listed separated by
+# commas, e.g., the second column of "#@CY,TR<tab>Asia/,Europe/".
+#
+# These experimental comments are present only for country codes where
+# the continent or ocean is not already obvious from the Zone name.
+# For example, there is no such comment for RU since it already
+# corresponds to Zone names starting with both "Europe/" and "Asia/".
+#
+#@AQ	Antarctica/
+#@IS,SH	Atlantic/
+#@CY,TR	Asia/,Europe/
+#@SJ	Arctic/
+#@CC,CX,KM,MG,YT	Indian/
--- a/externals/nx_tzdb/tzdb_to_nx/src/CMakeLists.txt
+++ b/externals/nx_tzdb/tzdb_to_nx/src/CMakeLists.txt
@@ -0,0 +1,11 @@
+add_compile_options(
+    -Werror=all
+    -Werror=extra
+
+    -Werror=shadow
+)
+
+include_directories(.)
+
+add_subdirectory(tzdb2nx)
+add_subdirectory(tzdb)
--- a/externals/nx_tzdb/tzdb_to_nx/src/tzdb/CMakeLists.txt
+++ b/externals/nx_tzdb/tzdb_to_nx/src/tzdb/CMakeLists.txt
@@ -0,0 +1,90 @@
+find_program(GIT_PROGRAM git)
+if (NOT GIT_PROGRAM)
+    message(FATAL_ERROR "git program not found")
+endif()
+
+find_program(GNU_DATE date)
+if (NOT GNU_DATE)
+    message(FATAL_ERROR "date program not found")
+endif()
+
+set(NX_TZDB_DIR "${CMAKE_CURRENT_BINARY_DIR}/nx" CACHE PATH "Path to Switch-style time zone data")
+set(NX_ZONEINFO_DIR "${NX_TZDB_DIR}/zoneinfo")
+
+set(TZDB_VERSION_FILE ${TZ_SOURCE_DIR}/NEWS)
+
+if (NOT "${TZDB2NX_VERSION}" STREQUAL "")
+    set(TZDB_VERSION "${TZDB2NX_VERSION}\n")
+else()
+    execute_process(
+        COMMAND 
+            ${GIT_PROGRAM} log --pretty=%at -n1 NEWS
+        OUTPUT_VARIABLE
+            TZ_COMMIT_TIME
+        WORKING_DIRECTORY
+            ${TZ_SOURCE_DIR}
+        COMMAND_ERROR_IS_FATAL ANY)
+
+    string(REPLACE "\n" "" TZ_COMMIT_TIME "${TZ_COMMIT_TIME}")
+
+    if (APPLE OR CMAKE_SYSTEM_NAME MATCHES "DragonFly|FreeBSD|NetBSD|OpenBSD")
+        set(VERSION_COMMAND ${GNU_DATE} -r ${TZ_COMMIT_TIME} +%y%m%d)
+    else ()
+        set(VERSION_COMMAND ${GNU_DATE} +%y%m%d --date=@${TZ_COMMIT_TIME})
+    endif ()
+
+    execute_process(
+        COMMAND
+            ${VERSION_COMMAND}
+        OUTPUT_VARIABLE
+            TZDB_VERSION
+        COMMAND_ERROR_IS_FATAL ANY)
+endif()
+
+set(NX_VERSION_FILE ${NX_TZDB_DIR}/version.txt)
+file(WRITE ${NX_VERSION_FILE} "${TZDB_VERSION}")
+
+add_custom_target(x80e
+    DEPENDS
+        tzdb2nx
+        ${NX_VERSION_FILE})
+
+set(BINARY_LIST_TXT ${NX_TZDB_DIR}/binaryList.txt)
+add_custom_command(
+    OUTPUT
+        ${BINARY_LIST_TXT}
+    COMMAND
+        ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_SOURCE_DIR}/generate_binary_list_txt.cmake ${BINARY_LIST_TXT} ${PROJECT_SOURCE_DIR}/CMakeModules/list_directory.cmake
+    WORKING_DIRECTORY
+        ${NX_ZONEINFO_DIR})
+
+add_custom_target(time_zone_binary_list
+    DEPENDS ${BINARY_LIST_TXT})
+add_dependencies(x80e time_zone_binary_list)
+
+set(TZ_DATA_LIST "")
+
+file(STRINGS "${TZIF_LIST_FILE}" TZ_FILES)
+foreach(FILE ${TZ_FILES})
+    file(RELATIVE_PATH TARG "${TZ_ZONEINFO_DIR}" "${FILE}")
+    get_filename_component(TARG_PATH "${NX_ZONEINFO_DIR}/${TARG}" DIRECTORY)
+    string(REGEX REPLACE "\/" "_" TARG_SANITIZED "${TARG}")
+    set(NX_TZ_TARGET ${NX_ZONEINFO_DIR}/${TARG})
+    add_custom_command(
+        OUTPUT
+            ${NX_TZ_TARGET}
+        COMMAND
+            mkdir -p ${TARG_PATH}
+        COMMAND
+            ${TZDB2NX_PATH} ${FILE} ${NX_ZONEINFO_DIR}/${TARG}
+        DEPENDS
+            tzdb2nx)
+
+    list(APPEND TZ_DATA_LIST ${NX_TZ_TARGET})
+endforeach()
+
+add_custom_target(time_zone_data
+    DEPENDS ${TZ_DATA_LIST})
+
+add_dependencies(x80e time_zone_data)
+add_dependencies(time_zone_binary_list time_zone_data)
--- a/externals/nx_tzdb/tzdb_to_nx/src/tzdb/generate_binary_list_txt.cmake
+++ b/externals/nx_tzdb/tzdb_to_nx/src/tzdb/generate_binary_list_txt.cmake
@@ -0,0 +1,52 @@
+set(BINARY_LIST_TXT ${CMAKE_ARGV3})
+set(LIST_DIR_CMAKE ${CMAKE_ARGV4})
+
+# Fill text file with zone names
+# Issue: Hyphens/underscores are not handled the same way Nintendo handles them
+function(get_files_nx TARG SUB_DIR)
+    execute_process(
+        COMMAND
+            ${CMAKE_COMMAND} -P ${LIST_DIR_CMAKE} false OFF
+        WORKING_DIRECTORY
+            ${TARG}
+        OUTPUT_VARIABLE
+            FILE_LIST
+    )
+    list(SORT FILE_LIST)
+    execute_process(
+        COMMAND
+            ${CMAKE_COMMAND} -P ${LIST_DIR_CMAKE} true OFF
+        WORKING_DIRECTORY
+            ${TARG}
+        OUTPUT_VARIABLE
+            DIR_LIST
+    )
+
+    foreach(FILE ${FILE_LIST})
+        if(FILE STREQUAL "\n")
+            continue()
+        endif()
+        list(REMOVE_ITEM DIR_LIST FILE)
+        if (SUB_DIR)
+            file(APPEND ${BINARY_LIST_TXT} "${SUB_DIR}/${FILE}\r\n")
+        else()
+            file(APPEND ${BINARY_LIST_TXT} "${FILE}\r\n")
+        endif()
+    endforeach()
+
+    list(SORT DIR_LIST)
+
+    foreach(DIR ${DIR_LIST})
+        if (NOT DIR OR DIR STREQUAL "\n")
+            continue()
+        endif()
+        if (SUB_DIR)
+            get_files_nx(${TARG}/${DIR} ${SUB_DIR}/${DIR})
+        else()
+            get_files_nx(${TARG}/${DIR} ${DIR})
+        endif()
+    endforeach()
+endfunction()
+
+get_files_nx(${CMAKE_SOURCE_DIR} "")
+
--- a/externals/nx_tzdb/tzdb_to_nx/src/tzdb2nx/CMakeLists.txt
+++ b/externals/nx_tzdb/tzdb_to_nx/src/tzdb2nx/CMakeLists.txt
@@ -0,0 +1,6 @@
+add_executable(tzdb2nx
+    main.cpp
+    tzif.cpp
+    tzif.h)
+
+set(TZDB2NX_PATH "$<TARGET_FILE:tzdb2nx>" CACHE PATH "Path to tzdb2nx path")
--- a/externals/nx_tzdb/tzdb_to_nx/src/tzdb2nx/main.cpp
+++ b/externals/nx_tzdb/tzdb_to_nx/src/tzdb2nx/main.cpp
@@ -0,0 +1,158 @@
+#include "tzif.h"
+#include <array>
+#include <cerrno>
+#include <cstdio>
+#include <cstring>
+#include <fcntl.h>
+#include <getopt.h>
+#include <poll.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+constexpr std::size_t ten_megabytes{(1 << 20) * 10};
+
+static void ShortHelp(const char *argv0) {
+  std::fprintf(stderr, "Usage: %s [INFILE] [OUTFILE]\n", argv0);
+}
+
+static void PrintArg(const char *short_arg, const char *long_arg,
+                     const char *text) {
+  std::fprintf(stderr, "%5s, %-20s %s\n", short_arg, long_arg, text);
+}
+
+static void PrintHelp(const char *argv0) {
+  ShortHelp(argv0);
+  std::fprintf(stderr,
+               "Converts a TZif file INFILE from the RFC8536 format to a "
+               "Nintendo Switch compatible file OUTFILE.\nWith no arguments, "
+               "tzdb2nx can read and write from stdin/stdout, "
+               "respectively.\nGiving no arguments without input will print "
+               "usage information and exit the program.\n\nArguments:\n");
+  PrintArg("-h", "--help", "Print this help text and exit");
+}
+
+int main(int argc, char *argv[]) {
+  int f{STDIN_FILENO};
+  const char *filename{"(stdin)"};
+  std::size_t filesize{ten_megabytes};
+
+  const char *optstring = "h";
+  int c;
+  const struct option longopts[] = {
+      {
+          "help",
+          no_argument,
+          nullptr,
+          'h',
+      },
+      {
+          nullptr,
+          0,
+          nullptr,
+          0,
+      },
+  };
+
+  while ((c = getopt_long(argc, argv, optstring, longopts, nullptr)) != -1) {
+    switch (c) {
+    case 'h':
+      PrintHelp(argv[0]);
+      return -1;
+    case '?':
+      ShortHelp(argv[0]);
+      return -1;
+    }
+  }
+
+  if (argc > 1) {
+    filename = argv[1];
+    f = open(filename, O_RDONLY);
+
+    if (f == -1) {
+      const int err = errno;
+      std::fprintf(stderr, "%s: %s\n", filename, std::strerror(err));
+      return err;
+    }
+
+    struct stat statbuf;
+    fstat(f, &statbuf);
+
+    filesize = statbuf.st_size;
+  } else {
+    struct pollfd fds {
+      f, POLLIN, 0,
+    };
+
+    const int result = poll(&fds, 1, 0);
+    if (result == 0) {
+      std::fprintf(stderr, "%s: No input\n", filename);
+      ShortHelp(argv[0]);
+      return -1;
+    }
+  }
+
+  u_int8_t *buf = new u_int8_t[filesize];
+
+  filesize = read(f, buf, filesize);
+  if (filesize == static_cast<std::size_t>(-1)) {
+    const int err = errno;
+    std::fprintf(stderr, "%s: %s\n", filename, std::strerror(err));
+    return err;
+  }
+  int result = close(f);
+  if (result == -1) {
+    const int err = errno;
+    std::fprintf(stderr, "%s: %s\n", filename, std::strerror(err));
+    return err;
+  }
+
+  if (filesize < 4) {
+    std::fprintf(stderr, "%s: Too small\n", filename);
+    return -1;
+  }
+  if (std::strncmp(reinterpret_cast<const char *>(buf), "TZif", 4) != 0) {
+    std::fprintf(stderr, "%s: Bad magic number\n", filename);
+    return -1;
+  }
+
+  const std::unique_ptr<Tzif::Data> tzif_data = Tzif::ReadData(buf, filesize);
+  if (tzif_data == nullptr) {
+    std::fprintf(stderr, "%s: Error occured while reading data\n", filename);
+    return -1;
+  }
+
+  delete[] buf;
+
+  std::vector<u_int8_t> output_buffer;
+  tzif_data->ReformatNintendo(output_buffer);
+
+  filename = "(stdout)";
+  f = STDOUT_FILENO;
+  if (argc > 2) {
+    filename = argv[2];
+    f = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0664);
+
+    if (f == -1) {
+      const int err = errno;
+      std::fprintf(stderr, "%s: %s\n", filename, std::strerror(err));
+      return err;
+    }
+  }
+
+  result = write(f, output_buffer.data(), output_buffer.size());
+  if (result == -1) {
+    const int err = errno;
+    std::fprintf(stderr, "%s: %s\n", filename, std::strerror(err));
+    return err;
+  }
+
+  result = close(f);
+  if (result == -1) {
+    const int err = errno;
+    std::fprintf(stderr, "%s: %s\n", filename, std::strerror(err));
+    return err;
+  }
+
+  return 0;
+}
--- a/externals/nx_tzdb/tzdb_to_nx/src/tzdb2nx/tzif.cpp
+++ b/externals/nx_tzdb/tzdb_to_nx/src/tzdb2nx/tzif.cpp
@@ -0,0 +1,146 @@
+#include "tzif.h"
+#include <cstdint>
+#include <cstring>
+#include <memory>
+#include <sys/types.h>
+
+namespace Tzif {
+
+static std::size_t SkipToVersion2(const u_int8_t *data, std::size_t size) {
+  char magic[5];
+  const u_int8_t *p{data};
+
+  std::memcpy(magic, data, 4);
+  magic[4] = '\0';
+
+  if (std::strcmp(magic, "TZif") != 0) {
+    return -1;
+  }
+
+  do {
+    p++;
+    if (p >= data + size) {
+      return -1;
+    }
+  } while (std::strncmp(reinterpret_cast<const char *>(p), "TZif", 4) != 0);
+
+  return p - data;
+}
+
+template <typename Type> constexpr static void SwapEndianess(Type *value) {
+  u_int8_t *data = reinterpret_cast<u_int8_t *>(value);
+
+  union {
+    u_int8_t data[sizeof(Type)];
+    Type value;
+  } temp;
+
+  for (u_int32_t i = 0; i < sizeof(Type); i++) {
+    u_int32_t alt_index = sizeof(Type) - i - 1;
+    temp.data[alt_index] = data[i];
+  }
+
+  *value = temp.value;
+}
+
+static void FlipHeader(Header &header) {
+  SwapEndianess(&header.isutcnt);
+  SwapEndianess(&header.isstdcnt);
+  SwapEndianess(&header.leapcnt);
+  SwapEndianess(&header.timecnt);
+  SwapEndianess(&header.typecnt);
+  SwapEndianess(&header.charcnt);
+}
+
+std::unique_ptr<DataImpl> ReadData(const u_int8_t *data, std::size_t size) {
+  const std::size_t v2_offset = SkipToVersion2(data, size);
+  if (v2_offset == static_cast<std::size_t>(-1)) {
+    return nullptr;
+  }
+
+  const u_int8_t *p = data + v2_offset;
+
+  Header header;
+  std::memcpy(&header, p, sizeof(header));
+  p += sizeof(header);
+
+  FlipHeader(header);
+
+  const std::size_t data_block_length =
+      header.timecnt * sizeof(int64_t) + header.timecnt * sizeof(u_int8_t) +
+      header.typecnt * sizeof(TimeTypeRecord) +
+      header.charcnt * sizeof(int8_t) + header.isstdcnt * sizeof(u_int8_t) +
+      header.isutcnt * sizeof(u_int8_t);
+
+  if (v2_offset + data_block_length + sizeof(Header) > size) {
+    return nullptr;
+  }
+
+  std::unique_ptr<DataImpl> impl = std::make_unique<DataImpl>();
+  impl->header = header;
+
+  const auto copy =
+      []<typename Type>(std::unique_ptr<Type[]> &array, int length,
+                        const u_int8_t *const &ptr) -> const u_int8_t * {
+    const std::size_t region_length = length * sizeof(Type);
+    array = std::make_unique<Type[]>(length);
+    std::memcpy(array.get(), ptr, region_length);
+    return ptr + region_length;
+  };
+
+  p = copy(impl->transition_times, header.timecnt, p);
+  p = copy(impl->transition_types, header.timecnt, p);
+  p = copy(impl->local_time_type_records, header.typecnt, p);
+  p = copy(impl->time_zone_designations, header.charcnt, p);
+  p = copy(impl->standard_indicators, header.isstdcnt, p);
+  p = copy(impl->ut_indicators, header.isutcnt, p);
+
+  const std::size_t footer_string_length = data + size - p - 2;
+  p++;
+
+  if (p + footer_string_length > data + size ||
+      p + footer_string_length < data) {
+    return nullptr;
+  }
+
+  impl->footer.tz_string = std::make_unique<char[]>(footer_string_length);
+  std::memcpy(impl->footer.tz_string.get(), p, footer_string_length);
+  impl->footer.footer_string_length = footer_string_length;
+
+  return impl;
+}
+
+static void PushToBuffer(std::vector<u_int8_t> &buffer, const void *data,
+                         std::size_t size) {
+  const u_int8_t *p{reinterpret_cast<const u_int8_t *>(data)};
+  for (std::size_t i = 0; i < size; i++) {
+    buffer.push_back(*p);
+    p++;
+  }
+}
+
+void DataImpl::ReformatNintendo(std::vector<u_int8_t> &buffer) const {
+  buffer.clear();
+
+  Header header_copy{header};
+  header_copy.isstdcnt = 0;
+  header_copy.isutcnt = 0;
+  FlipHeader(header_copy);
+
+  PushToBuffer(buffer, &header_copy, sizeof(Header));
+  PushToBuffer(buffer, transition_times.get(),
+               header.timecnt * sizeof(int64_t));
+  PushToBuffer(buffer, transition_types.get(),
+               header.timecnt * sizeof(u_int8_t));
+  PushToBuffer(buffer, local_time_type_records.get(),
+               header.typecnt * sizeof(TimeTypeRecord));
+  PushToBuffer(buffer, time_zone_designations.get(),
+               header.charcnt * sizeof(int8_t));
+  // omit standard_indicators
+  // omit ut_indicators
+  PushToBuffer(buffer, &footer.nl_a, 1);
+  PushToBuffer(buffer, footer.tz_string.get(), footer.footer_string_length);
+  PushToBuffer(buffer, &footer.nl_b, 1);
+}
+
+} // namespace Tzif
--- a/externals/nx_tzdb/tzdb_to_nx/src/tzdb2nx/tzif.h
+++ b/externals/nx_tzdb/tzdb_to_nx/src/tzdb2nx/tzif.h
@@ -0,0 +1,72 @@
+#pragma once
+
+#include <array>
+#include <memory>
+#include <sys/types.h>
+#include <vector>
+
+namespace Tzif {
+
+typedef struct {
+  char magic[4];
+  u_int8_t version;
+  u_int8_t reserved[15];
+  u_int32_t isutcnt;
+  u_int32_t isstdcnt;
+  u_int32_t leapcnt;
+  u_int32_t timecnt;
+  u_int32_t typecnt;
+  u_int32_t charcnt;
+} Header;
+static_assert(sizeof(Header) == 0x2c);
+
+class Footer {
+public:
+  explicit Footer() = default;
+  ~Footer() = default;
+
+  const char nl_a{'\n'};
+  std::unique_ptr<char[]> tz_string;
+  const char nl_b{'\n'};
+
+  std::size_t footer_string_length;
+};
+
+#pragma pack(push, 1)
+typedef struct {
+  u_int32_t utoff;
+  u_int8_t dst;
+  u_int8_t idx;
+} TimeTypeRecord;
+#pragma pack(pop)
+static_assert(sizeof(TimeTypeRecord) == 0x6);
+
+class Data {
+public:
+  explicit Data() = default;
+  virtual ~Data() = default;
+
+  virtual void ReformatNintendo(std::vector<u_int8_t> &buffer) const = 0;
+};
+
+class DataImpl : public Data {
+public:
+  explicit DataImpl() = default;
+  ~DataImpl() override = default;
+
+  void ReformatNintendo(std::vector<u_int8_t> &buffer) const override;
+
+  Header header;
+  Footer footer;
+
+  std::unique_ptr<int64_t[]> transition_times;
+  std::unique_ptr<u_int8_t[]> transition_types;
+  std::unique_ptr<TimeTypeRecord[]> local_time_type_records;
+  std::unique_ptr<int8_t[]> time_zone_designations;
+  std::unique_ptr<u_int8_t[]> standard_indicators;
+  std::unique_ptr<u_int8_t[]> ut_indicators;
+};
+
+std::unique_ptr<DataImpl> ReadData(const u_int8_t *data, std::size_t size);
+
+} // namespace Tzif