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Signed-off-by: swurl <swurl@swurl.xyz>
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# tzdb_to_nx
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This is a CMake/C++ project to convert RFC 8536 time zone data to the Nintendo Switch's format.
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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.
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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.
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That leaves this project in a place where it is not likely to be used, but will remain here as a reference.
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- 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.
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- tzdb2nx: C++ program that converts a single tzif file to the Nintendo's format.
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The fine folks over at [SwitchBrew](https://switchbrew.org/wiki/PSC_services#ITimeZoneService) have left very helpful information on reading the data.
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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).
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This means the TZif 1 data is not present, so essentially we are left with the second half of each file.
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Nintendo also does not seem to run the `zic` program on their output when they build the time zone data.
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I have left the relevant build command for that in src/tzdb/CMakeLists.txt commented out, but it isn't used here.
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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).
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The CMake and C++ code in this repository is licensed under the MIT License.
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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).
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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).
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