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September 2013

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tzcode2013f and tzdata2013f available
by Paul Eggert Sept. 25, 2013

Sept. 25, 2013

The 2013f release of the tz code and data is available. It reflects the following changes, which were either circulated on the tz mailing list or are relatively minor administrative changes: Changes affecting near-future time stamps Tocantins will very likely not observe DST starting this spring. (Thanks to Steffen Thorsen.) Jordan will likely stay at UTC+3 indefinitely, and will not fall back this fall. Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) Changes affecting API The types of the global variables 'timezone' and 'altzone' (if present) have been changed back to 'long'. This is required for 'timezone' by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. These variables were originally 'long' in the tz code, but were mistakenly changed to 'time_t' in 1987; nobody reported the incompatibility until now. The difference matters on x32, where 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) Changes affecting the build procedure Avoid long strings in leapseconds.awk to work around a mawk bug. (Thanks to Cyril Baurand.) Changes affecting documentation and commentary New file 'NEWS' that contains release notes like this one. Paraguay's law does not specify DST transition time; 00:00 is customary. (Thanks to Waldemar Villamayor-Venialbo.) Minor capitalization fixes. Changes affecting version-control only The experimental github repository now contains annotated and signed tags for recent releases, e.g., '2013e' for Release 2013e. Releases are tagged starting with 2012e; earlier releases were done differently, and tags would either not have a simple name or not exactly match what was released. 'make set-timestamps' is now simpler and a bit more portable. Here are links to the release files: ftp://ftp.iana.org/tz/releases/tzcode2013f.tar.gz ftp://ftp.iana.org/tz/releases/tzdata2013f.tar.gz The files are also available via HTTP as follows: http://www.iana.org/time-zones/repository/releases/tzcode2013f.tar.gz http://www.iana.org/time-zones/repository/releases/tzdata2013f.tar.gz 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. As usual, links to the latest release files are here: http://www.iana.org/time-zones/repository/tzcode-latest.tar.gz http://www.iana.org/time-zones/repository/tzdata-latest.tar.gz ftp://ftp.iana.org/tz/tzcode-latest.tar.gz ftp://ftp.iana.org/tz/tzdata-latest.tar.gz This release corresponds to commit 7436d7438735104103d6d6b0ae5b45bdef7b69a2 dated Tue Sep 24 23:37:36 2013 -0700 in the unofficial github repository at <https://github.com/eggert/tz>. Here are the GPG checksums for the release files: -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAABAgAGBQJSQoY1AAoJEO2X6Q5iqn40MOwP/j4xZCapf6Wqzmr7aexvNAVj t+L665BgXBYgmh3V+D1B1mj+B1Ilu0+3z0b4xyNB938trMuWMoBVfBjYfw+nQgbk hoIFggl3jh4BmCJqL7gLRYDBMxhuTcZfDbLHYJ1znuNC63PJej8X3uOXBR1TUQC4 /D40tArmDrpA2KQ5uBbBnIqWFmWUqbPPM+4Zb02TFI6ElIzN9yF7hO8c4AzevYZG SuY6DzdRAvt+HKkPb5BSH5qIb9WnOHPHlh1gb8Ek8IjfC0Y/NPFkfivBcRLcvU3D BMH+ysfhrt/L2shGbN9xJY72hflWZAlBUveggtEEem4ZGyR3jt494qs5bAmfFs5c NEl4FOJ7A0zR4zOOXasY8d8H9x8QHACM7pnFl007CC3/X65ahMDYznug3m0fIlTT FIVExwC7vu5q9phKZqllsf1WDDlYsRDSjvZRyJftAo8d7uiX/hSRV62ENzvDpZTE IhKbQcJO4o3HSy1ZAR/8ZBOZZTrfuCTVia3HQSv+z9HE1DcqZr24Vc5rUxOWlLAG Ikd+F23YtPqH7d+PVZMBDIZkqeu7qB/3a7WSzEvE/eYIKeoGojQBIvz9swZd5vmb tbHrYmvCM9nuPat6XfMhCms80gjcxPSqS3+UODvq01+OOG/v+1uxBavxZWjMo/6n yoay8oUjHbaBUSy9gjv/ =mvcv -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAABAgAGBQJSQoY1AAoJEO2X6Q5iqn40MHYP/Aq8zW+aeJkn0MP55pJYL/oJ 7yGojddjV7FApzoqiBnTqsmUtxMWdrQR8ZAejSoKvZWWI/XwhHv6nPO6ZAlMB7WV 1lakGSjGD055ZhOQaViMF0/i2iQJXrWW+YAy0QWUhJSSLOHZ/Mk0dUVPb2I/3XPW uFuR8xmrJE4gBTEXyN9CL/ebmpvV0lEUbNEj46Y/SKDDqcF8pA1WJlbCiqcxwiTp lS0B/KuwhKof8N3ij7TnIlIM/HzwnTFiL3zabvUNErhRtP3PWggCVanyULnNcSJU 2C4pSQRC3CW2gIPZfF7e3EaV0RoraeinRPdSM+HHsgM13WHw/EuXQ3QJXvJDYoWc w0VnD2cnDqlSBEkWqI/SdK4W3bRhR9lhskFJSBGxSr6XBBXzYAgFu4dzL5DzCSd5 9ITsIC/2FMslLNAEkufNOpHLV7BBrrMDmtwuM2B1yc4zkMXVMKof9v0BxnODGTsH gxncarfm19i7Ew/6rz9UqVH8gsPt2JkMbmLnPjoEo5bgF5JQINO3WC6FtLWxNlPn 5DUfwhE9XcdxoJCl+sA3DsB3qxWz3VHSVH8M3OYSxtRqzRFXpNcLXbwSxz+IlSjp +sTuM8WAECLsSRT5S1zIroobbs2sguY6Gipk9Lq3L4Lux3eHkMzlCoZk36OJdU6K U/ScBctj4rv1sM33kqJW =eD7x -----END PGP SIGNATURE-----

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tzcode2013e and tzdata2013e available
by Paul Eggert Sept. 20, 2013

Sept. 20, 2013

The 2013e release of the tz code and data is available. It reflects the following changes circulated on the tz mailing list: Changes affecting near-future time stamps This year Fiji will start DST on October 27, not October 20. (Thanks to David Wheeler for the heads-up.) For now, guess that Fiji will continue to spring forward the Sunday before the fourth Monday in October. Changes affecting current and future time zone abbreviations Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian time zone abbreviations since 1932. (Thanks to George Ziegler, Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, Asia/Makassar, and Asia/Pontianak. Use ART (UTC-3, standard time), rather than WARST (also UTC-3, but daylight saving time) for San Luis, Argentina since 2009. Changes affecting Godthab time stamps after 2037 if version mismatch Allow POSIX-like TZ strings where the transition time's hour can range from -167 through 167, instead of the POSIX-required 0 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the new Fiji rules. This is a more-compact way to represent far-future time stamps for America/Godthab, America/Santiago, Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by this change. (Derived from a suggestion by Arthur David Olson.) Allow POSIX-like TZ strings where daylight saving time is in effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western Argentina Summer Time all year. This supports a more-compact way to represent the 2013d data for America/Argentina/San_Luis. Because of the change for San Luis noted above this change does not affect the current data. (Thanks to Andrew Main (Zefram) for suggestions that improved this change.) Where these two TZ changes take effect, there is a minor extension to the tz file format in that it allows new values for the embedded TZ-format string, and the tz file format version number has therefore been increased from 2 to 3 as a precaution. Version-2-based client code should continue to work as before for all time stamps before 2038. Existing version-2-based client code (tzcode, GNU/Linux, Solaris) has been tested on version-3-format files, and typically works in practice even for time stamps after 2037; the only known exception is America/Godthab. Changes affecting time stamps before 1970 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects some errors before 1947. Some zones have been turned into links, when they differ from existing zones only in older data that was likely invented or that differs only in LMT or transition from LMT. These changes affect only time stamps before 1943. The affected zones are: Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, America/Grenada, America/Guadeloupe, America/Marigot, America/Montserrat, America/St_Barthelemy, America/St_Kitts, America/St_Lucia, America/St_Thomas, America/St_Vincent, America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for confirming that the old Europe/Vaduz zone was wrong and the new link is better for WWII-era times.) Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects America/Cayman, America/Jamaica and America/Grand_Turk time stamps from 1890 to 1912. Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. This affects Europe/Zurich time stamps from 1853 to 1894. (Thanks to Alois Treindl). Change the date of the circa-1850 Zurich transition from 1849-09-12 to 1853-07-16, overriding Shanks with data from Messerli about postal and telegraph time in Switzerland. Changes affecting time zone abbreviations before 1970 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, as Jakarta was called Batavia back then. Changes affecting API The 'zic' command now outputs a dummy transition when far-future data can't be summarized using a TZ string, and uses a 402-year window rather than a 400-year window. For the current data, this affects only the Asia/Tehran file. It does not affect any of the time stamps that this file represents, so zdump outputs the same information as before. (Thanks to Andrew Main (Zefram).) The 'date' command has a new '-r' option, which lets you specify the integer time to display, a la FreeBSD. The 'tzselect' command has two new options '-c' and '-n', which lets you select a zone based on latitude and longitude. The 'zic' command's '-v' option now warns about constructs that require the new version-3 binary file format. (Thanks to Arthur David Olson for the suggestion.) Support for floating-point time_t has been removed. It was always dicey, and POSIX no longer requires it. (Thanks to Eric Blake for suggesting to the POSIX committee to remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy Heninger, Arthur David Olson, and Alois Treindl, for reporting bugs and elucidating some of the corners of the old floating-point implementation.) The signatures of 'offtime', 'timeoff', and 'gtime' have been changed back to the old practice of using 'long' to represent UT offsets. This had been inadvertently and mistakenly changed to 'int_fast32_t'. (Thanks to Christos Zoulos.) The code avoids undefined behavior on integer overflow in some more places, including gmtime, localtime, mktime and zdump. Changes affecting the zdump utility zdump now outputs "UT" when referring to Universal Time, not "UTC". "UTC" does not make sense for time stamps that predate the introduction of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen for clarifying UT vs UTC.) Data changes affecting behavior of tzselect and similar programs Country code BQ is now called the more-common name "Caribbean Netherlands" rather than the more-official "Bonaire, St Eustatius & Saba". Remove from zone.tab the names America/Montreal, America/Shiprock, and Antarctica/South_Pole, as they are equivalent to existing same-country-code zones for post-1970 time stamps. The data for these names are unchanged, so the names continue to work as before. Changes affecting code internals zic -c now runs way faster on 64-bit hosts when given large numbers. zic now uses vfprintf to avoid allocating and freeing some memory. tzselect now computes the list of continents from the data, rather than have it hard-coded. Minor changes pacify GCC 4.7.3 and GCC 4.8.1. Changes affecting the build procedure The 'leapseconds' file is now generated automatically from a new file 'leap-seconds.list', which is a copy of <ftp://time.nist.gov/pub/leap-seconds.list>. A new source file 'leapseconds.awk' implements this. The goal is simplification of the future maintenance of 'leapseconds'. When building the 'posix' or 'right' subdirectories, if the subdirectory would be a copy of the default subdirectory, it is now made a symbolic link if that is supported. This saves about 2 MB of file system space. The links America/Shiprock and Antarctica/South_Pole have been moved to the 'backward' file. This affects only nondefault builds that omit 'backward'. Changes affecting version-control only .gitignore now ignores 'date'. Changes affecting documentation and commentary Changes to the 'tzfile' man page It now mentions that the binary file format may be extended in future versions by appending data. It now refers to the 'zdump' and 'zic' man pages. Changes to the 'zic' man page It lists conditions that elicit a warning with '-v'. It says that the behavior is unspecified when duplicate names are given, or if the source of one link is the target of another. Its examples are updated to match the latest data. The definition of white space has been clarified slightly. (Thanks to Michael Deckers.) Changes to the 'Theory' file There is a new section about the accuracy of the tz database, describing the many ways that errors can creep in, and explaining why so many of the pre-1970 time stamps are wrong or misleading (thanks to Steve Allen, Lester Caine, and Garrett Wollman for discussions that contributed to this). The 'Theory' file describes LMT better (this follows a suggestion by Guy Harris). It refers to the 2013 edition of POSIX rather than the 2004 edition. It's mentioned that excluding 'backward' should not affect the other data, and it suggests at least one zone.tab name per inhabited country (thanks to Stephen Colebourne). Some longstanding restrictions on names are documented, e.g., 'America/New_York' precludes 'America/New_York/Bronx'. It gives more reasons for the 1970 cutoff. It now mentions which time_t variants are supported, such as signed integer time_t. (Thanks to Paul Goyette for reporting typos in an experimental version of this change.) (Thanks to Philip Newton for correcting typos in these changes.) Documentation and commentary is more careful to distinguish UT in general from UTC in particular. (Thanks to Steve Allen.) Add a better source for the Zurich 1894 transition. (Thanks to Pierre-Yves Berger.) Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) Here are links to the release files: ftp://ftp.iana.org/tz/releases/tzcode2013e.tar.gz ftp://ftp.iana.org/tz/releases/tzdata2013e.tar.gz The files are also available via HTTP as follows: http://www.iana.org/time-zones/repository/releases/tzcode2013e.tar.gz http://www.iana.org/time-zones/repository/releases/tzdata2013e.tar.gz 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. As usual, links to the latest release files are here: http://www.iana.org/time-zones/repository/tzcode-latest.tar.gz http://www.iana.org/time-zones/repository/tzdata-latest.tar.gz ftp://ftp.iana.org/tz/tzcode-latest.tar.gz ftp://ftp.iana.org/tz/tzdata-latest.tar.gz This release corresponds to commit db6270a00d1a364865f3080ac41d8d6d42f5c833 dated Thu Sep 19 23:50:04 2013 -0700 in the unofficial github repository at <https://github.com/eggert/tz>. 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