002951760f
i:
The compile-time flag NOSOLAR has been removed, as nowadays the
benefit of slightly shrinking runtime table size is outweighed by the
cost of disallowing potential future updates that exceed old limits.
h:
Fix localtime overflow bugs with 32-bit unsigned time_t.
zdump no longer assumes sscanf returns maximal values on overflow.
g:
'zic' now runs on platforms that lack both hard links and symlinks.
(Thanks to Theo Veenker for reporting the problem, for MinGW.)
Also, fix some bugs on platforms that lack hard links but have symlinks.
'zic -v' again warns that Asia/Tehran has no POSIX environment variable
to predict the far future, fixing a bug introduced in 2013e.
f:
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.)
65 lines
2.8 KiB
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65 lines
2.8 KiB
Plaintext
README for the tz distribution
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"What time is it?" -- Richard Deacon as The King
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"Any time you want it to be." -- Frank Baxter as The Scientist
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(from the Bell System film "About Time")
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The Time Zone Database (often called tz or zoneinfo) contains code and
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data that represent the history of local time for many representative
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locations around the globe. It is updated periodically to reflect
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changes made by political bodies to time zone boundaries, UTC offsets,
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and daylight-saving rules.
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Unless otherwise specified, all files in the tz code and data are in
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the public domain, so clarified as of 2009-05-17 by Arthur David Olson.
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The few exceptions are code derived from BSD, which uses the BSD license.
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Here is a recipe for acquiring, building, installing, and testing the
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tz distribution on a GNU/Linux or similar host.
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mkdir tz
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cd tz
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wget --retr-symlinks 'ftp://ftp.iana.org/tz/tz*-latest.tar.gz'
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gzip -dc tzcode-latest.tar.gz | tar -xf -
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gzip -dc tzdata-latest.tar.gz | tar -xf -
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Be sure to read the comments in "Makefile" and make any changes needed
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to make things right for your system, especially if you are using some
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platform other than GNU/Linux. Then run the following commands,
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substituting your desired installation directory for "$HOME/tzdir":
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make TOPDIR=$HOME/tzdir install
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$HOME/tzdir/etc/zdump -v America/Los_Angeles
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Historical local time information has been included here to:
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* provide a compendium of data about the history of civil time
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that is useful even if the data are not 100% accurate;
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* give an idea of the variety of local time rules that have
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existed in the past and thus an idea of the variety that may be
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expected in the future;
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* provide a test of the generality of the local time rule description
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system.
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The information in the time zone data files is by no means authoritative;
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the files currently do not even attempt to cover all time stamps before
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1970, and there are undoubtedly errors even for time stamps since 1970.
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If you know that the rules are different from those in a file, by all means
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feel free to change a file (and please send the changed version to
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tz@iana.org for use in the future). Europeans take note!
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Thanks to these Timezone Caballeros who've made major contributions to the
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time conversion package: Keith Bostic; Bob Devine; Paul Eggert; Robert Elz;
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Guy Harris; Mark Horton; John Mackin; and Bradley White. Thanks also to
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Michael Bloom, Art Neilson, Stephen Prince, John Sovereign, and Frank Wales
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for testing work, and to Gwillim Law for checking local mean time data.
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Thanks in particular to Arthur David Olson, the project's founder and first
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maintainer, to whom the timezone community owes the greatest debt of all.
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None of them are responsible for remaining errors.
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Look in <ftp://ftp.iana.org/tz/releases/> for updated versions of these files.
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Please send comments or information to tz@iana.org.
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