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December 2023

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2023d release of tz code and data available
by Paul Eggert Dec. 22, 2023

Dec. 22, 2023

The 2023d release of the tz code and data is available. This release contains the following changes: Briefly: Ittoqqortoormiit, Greenland changes time zones on 2024-03-31. Vostok, Antarctica changed time zones on 2023-12-18. Casey, Antarctica changed time zones five times since 2020. Code and data fixes for Palestine timestamps starting in 2072. A new data file zonenow.tab for timestamps starting now. Changes to future timestamps Ittoqqortoormiit, Greenland (America/Scoresbysund) joins most of the rest of Greenland's timekeeping practice on 2024-03-31, by changing its time zone from -01/+00 to -02/-01 at the same moment as the spring-forward transition. Its clocks will therefore not spring forward as previously scheduled. The time zone change reverts to its common practice before 1981. Fix predictions for DST transitions in Palestine in 2072-2075, correcting a typo introduced in 2023a. Changes to past and future timestamps Vostok, Antarctica changed to +05 on 2023-12-18. It had been at +07 (not +06) for years. (Thanks to Zakhary V. Akulov.) Change data for Casey, Antarctica to agree with timeanddate.com, by adding five time zone changes since 2020. Casey is now at +08 instead of +11. Changes to past tm_isdst flags Much of Greenland, represented by America/Nuuk, changed its standard time from -03 to -02 on 2023-03-25, not on 2023-10-28. This does not affect UTC offsets, only the tm_isdst flag. (Thanks to Thomas M. Steenholdt.) New data file A new data file zonenow.tab helps configure applications that use timestamps dated from now on. This simplifies configuration, since users choose from a smaller Zone set. The file's format is experimental and subject to change. Changes to code localtime.c no longer mishandles TZif files that contain a single transition into a DST regime. Previously, it incorrectly assumed DST was in effect before the transition too. (Thanks to Alois Treindl for debugging help.) localtime.c's timeoff no longer collides with OpenBSD 7.4. The C code now uses _Generic only if __STDC_VERSION__ says the compiler is C11 or later. tzselect now optionally reads zonenow.tab, to simplify when configuring only for timestamps dated from now on. tzselect no longer creates temporary files. tzselect no longer mishandles the following: Spaces and most other special characters in BUGEMAIL, PACKAGE, TZDIR, and VERSION. TZ strings when using mawk 1.4.3, which mishandles regular expressions of the form /X{2,}/. ISO 6709 coordinates when using an awk that lacks the GNU extension of newlines in -v option-arguments. Non UTF-8 locales when using an iconv command that lacks the GNU //TRANSLIT extension. zic no longer mishandles data for Palestine after the year 2075. Previously, it incorrectly omitted post-2075 transitions that are predicted for just before and just after Ramadan. (Thanks to Ken Murchison for debugging help.) zic now works again on Linux 2.6.16 and 2.6.17 (2006). (Problem reported by Rune Torgersen.) Changes to build procedure The Makefile is now more compatible with POSIX: * It no longer defines AR, CC, CFLAGS, LDFLAGS, and SHELL. * It no longer uses its own 'cc' in place of CC. * It now uses ARFLAGS, with default specified by POSIX. * It does not use LFLAGS incompatibly with POSIX. * It uses the special .POSIX target. * It quotes special characters more carefully. * It no longer mishandles builds in an ISO 8859 locale. Due to the CC changes, TZDIR is now #defined in a file tzfile.h built by 'make', not in a $(CC) -D option. Also, TZDEFAULT is now treated like TZDIR as they have similar roles. Changes to commentary Limitations and hazards of the optional support for obsolescent C89 platforms are documented better, along with a tentative schedule for removing this support. Here are links to the release files: https://www.iana.org/time-zones/repository/releases/tzcode2023d.tar.gz https://www.iana.org/time-zones/repository/releases/tzdata2023d.tar.gz https://www.iana.org/time-zones/repository/releases/tzdb-2023d.tar.lz The following convenience links are also available, although they may point to the previous release until the relevant caches are refreshed: https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz Links are also available via plain HTTP, and via FTP from ftp://ftp.iana.org/tz/releases with the same basenames as above. Each release file has a GPG signature, which can be retrieved by appending ".asc" to the above URLs. Copies of these signatures are appended to this message. This release corresponds to commit cc48c2dfa2f3c21d25ab108bba978b0307ecf0e8 dated 2023-12-21 20:02:24 -0800 and tagged '2023d' in the development GitHub repository at <https://github.com/eggert/tz>. Here are the SHA-512 checksums for the release files: 3994a5a060a7a5fffc6585f5191cf7679f9f9be44dbcee4d67d0e42c5b6020c308cb55caf8bf8d51554697665105a174cb470c8c4fc069438350f3bac725709b tzcode2023d.tar.gz 81832b2d738c28cecbcb3906cc07568c5ae574adc9de35b25d4bf613581c92d471d67213b4261a56f0ec02efcf211b4e298b7e1dc367c972e726b0a2e9498df4 tzdata2023d.tar.gz 334f02e20d5841e60ddbdbf074f231c1564c9ac7781bad8c9813e3045d3ea0422acd1caa23a63466ca6113c396d701ccbef29669749ae844d218e4e601a9ee02 tzdb-2023d.tar.lz Here are GPG digital signatures for the release files: -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEfjeSqdis99YzvBWI7ZfpDmKqfjQFAmWFCxgACgkQ7ZfpDmKq fjQjkhAAuWOz1EC8Wo3ug3fU4ns0KJIk7fTV6yNKUGrjuxOmc15+Dxb8QtLKagTr 9bZBsnI1v3krgMclbuEirbkeacST0rnKbW0Dije20ZZXYUaDQ3J3nGbjOSfcnLNk dYODCQKVarkbZ70+mmm4ytvwpuQDY5W/WcP/8qXB+wTQQukAGHlglDEcdQKIwz1L aMqGzO6hd5Wv/mw0Nz16BIoEqntKLzSJE3h5h92lBhVA0em02jSrTzBZePW9k3qb VG9qjui5nrWW4nJZln15XKBz7omo7e+NEP9UFzvCWTgwKQkdGNMbTjj6cBh8wKMX SPgCBvHyGx2UzukdxXzzCEn471Ug1XNHJAAfvlEd3FkrPcUc5Hj7w0chKYibQTsm LrjUSzbIVX5EBIxEDaGWrDbahLsaw+w+Ui09nFZ/sSB1LcbCa9eGsYGHvicnBu2S RZhZWk7lL8rtQjFjOMeoLy5j3rX8zwE07BNgjmnfkxGkZJ7XdriWy937d5SLvkKN /gaaaJ/32NDzTdzkhdOLcqKi+x2wCODCNDThfM4JiOIzCFkeSlaYnqShW7CcV/9c Nh9VM9zLKkApqL9Mr/kPqT5+FmN6GunMK3y9qNwA8ROq7DpAgUWoc4ZGoeNYy5I9 XbSk2ua/gAFfJsubjZ56//eEgFsLOLcE2eyFpS0WPcIA9qVk+Jc= =ZPDg -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEfjeSqdis99YzvBWI7ZfpDmKqfjQFAmWFCxkACgkQ7ZfpDmKq fjRuUxAAoioAZhZkP9DnoNvoo2YG+g4gxS4GIIw1KK6nhZqIN8F9e4wrvw6/++x/ 7FNP2+KV7ObTNlqeONv2niAL8zuFq8VhkN60D4j1qEu9H21Wxp6HFWOFEWi8l5TS l6dp4S1Rb5LmCVlbj2MbrbE6Qc+QptSdGuw12MQR34b5F8pX39vt+edMfHvA2lw0 KhMkELOaBhKCAoiVHC8onUZvCg5qEpynQ88LpKgnLWslT9fcU3m0mCuiXldSn5kp KppIlAFp6WuaKIJiuj61gjH9Py00PM7ww1+0eZbnbametmM3E2Or+YoP1pm5bIy8 77+iVCvBu+B1aW/cC1h2k3vLRUg8sFxMvGJdpow6JN1D+2e3Flk8+A8DPwRXtCRV yjjGOzIltbWwD7fisPKbvXSrVlQmMrNLMoyQcljZbYUa5nhTMoCiv+yed/DzG2ZF pwAJguKenamOiRpChFfkrVXBn/AWr4G7FVAogckFClz7qP6KSekJ0h1MzUw31c5g 8XZEwXNO2RGLbhgCw5uLg3V2KUvurSYGSBB46TnMNBLz1xRNelzkJ7XvJVIhxCEN L1t32v4jbD4YtXHqNugVId9uY3x8ed8SPdFy+8C2OqKY0TiWOTiAH2rz3vcz2L6O rsubE+4g/LUQI0fS9hTcabD9RcsP3k3/h2fZYLORM6frwuZA82U= =ylD7 -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEfjeSqdis99YzvBWI7ZfpDmKqfjQFAmWFCxoACgkQ7ZfpDmKq fjQiug//UW82Sq338kOG4pKEgEjoinNowfqA0cb5yZgg/wI9KKm3MSd2DqVOpySI MUwLzE2mqopxLsqrg+erdAgnaw67UqE7nkWui9zKYaON4D6XkwnFEyJTwefYzEUu WevUIMDreoK20ifcCYRNyvjFU6ik0MUVq1E5EZcli5yip4E7MRNQfiLemEe65shr ivUXndETTY06kLCf8Os7MyPxrrFc1IBB8f8fuRXcIgqqBRO+2YeViIh8iIbWIImF lO4S3Knh8Pd+6fOG5AGUcD8V7h5mZhFOVhTaKy6EWvU/98SZdGRIfszeHmgLCKmq CdKCO1K8XOITkqSWCenfTXnNELm/hsnuGPBcaRBxWXFNVLBaSaufmw0+h5IsviCo DwMqp3z7byOlNwYqeF+bYCXaoJ5ZATjCK82D5xKGLPs394/f6m46XEcQR9AU2JUR N59J0smHiH9lNzEuIcM7S8Rwwm05uVNUdHBubkz4YEWeruT5ZNlhRUnfq63Vv4ol UN5Lwqqew5V5kXmKueBHd5czN65z96EVsJTs9xMuS2OR2uekCmtqaYKhpL5DsFPH xcaAADZ1BvR2BJUmMSyXT/slyEjyK8I20irZaBGfSmAiHp9o2AW3K1pXLAXasa4E K+OAFiIqtuH7zGOIcDcj8A50KD//70nn8DPgk9S1HuQ4uTKcXBg= =IyqX -----END PGP SIGNATURE-----

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