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Paul Eggert
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In 2014g, localtime and mktime set tzname[0] and tzname[1] as if by tzset, regardless of the requested time stamp. In 2014f and earlier, localtime and mktime then set tzname[0] or tzname[1] to a time zone appropriate for the time stamp in question. Although both behaviors conform to POSIX, the 2014f behavior is better because it lets a single-threaded application discover the time zone abbreviation appropriate for the just-queried time stamp even on platforms that lack TM_ZONE. The 2014f-and-earlier zdump relies on the 2014f library behavior on these platforms. Problem reported by Tim Parenti in: http://mm.icann.org/pipermail/tz/2014-September/021585.html * localtime.c (localsub): Treat a nonzero offset value as a request to set tzname on success. All callers changed. (localtime_rz, mktime_z): Define only if NETBSD_INSPIRED, as they're no longer needed otherwise. (localtime_tzset): Invert sense of third arg from SKIP_TZSET to SETTZ. New arg SETNAME. All callers changed. (localtime): Request tzname to be set on success. (mktime_tzname): New function, with most of the previous contents of mktime_z. (mktime_z, mktime): Use it. * NEWS: Document the above.
README for the tz distribution "What time is it?" -- Richard Deacon as The King "Any time you want it to be." -- Frank Baxter as The Scientist (from the Bell System film "About Time") The Time Zone Database (often called tz 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. Unless otherwise specified, all files in the tz code and data are in the public domain, so clarified as of 2009-05-17 by Arthur David Olson. The few exceptions are code derived from BSD, which uses the BSD license. Here is a recipe for acquiring, building, installing, and testing the tz distribution on a GNU/Linux or similar host. mkdir tz cd tz wget --retr-symlinks 'ftp://ftp.iana.org/tz/tz*-latest.tar.gz' gzip -dc tzcode-latest.tar.gz | tar -xf - gzip -dc tzdata-latest.tar.gz | tar -xf - Be sure to read the comments in "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/etc/zdump -v America/Los_Angeles Historical local time information has been included here to: * 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 an idea of the variety that may be expected in the future; * provide a test of 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. Look in <ftp://ftp.iana.org/tz/releases/> for updated versions of these files. Please send comments or information to tz@iana.org.