Time zone database and code
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timparenti and eggert Chile changes DST rules from 2019-04-06.
* southamerica (Chile): Change DST dates to be observed from the first
Saturday in September at 24:00 mainland time until the first Saturday
in April at 24:00 mainland time, beginning with the change to Winter
Time on 2019-04-06.
* NEWS: Mention this.
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.gitignore * .gitignore: Ignore .patch and .tzs files. Apr 8, 2018
CONTRIBUTING * CONTRIBUTING: Mention ‘git blame’. Mar 2, 2018
LICENSE Clarify LICENSE file May 25, 2017
Makefile Put a bit more info into tzdata.zi version string Jul 20, 2018
NEWS Chile changes DST rules from 2019-04-06. Aug 13, 2018
README * README: Change directory to match Debian. Jan 13, 2018
africa Give title lines to many files lacking them Jul 16, 2018
antarctica Give title lines to many files lacking them Jul 16, 2018
asctime.c Update and/or clean up POSIX version info Apr 15, 2018
asia Give title lines to many files lacking them Jul 16, 2018
australasia Give title lines to many files lacking them Jul 16, 2018
backward Give title lines to many files lacking them Jul 16, 2018
backzone Prefer “timestamp” to “time stamp” May 27, 2018
calendars Convert Theory file to HTML Oct 2, 2017
checklinks.awk Shrink tzdata.zi somewhat Jun 2, 2017
checktab.awk Remove unused letters from Rule lines Jan 30, 2018
date.1 Use “timezone“ for timestamp histories Jun 27, 2018
date.c Port to GCC 4.8.4 Jun 16, 2017
difftime.c Give title lines to many files lacking them Jul 16, 2018
etcetera Give title lines to many files lacking them Jul 16, 2018
europe * europe: Add commentary for Soviet time. Jul 20, 2018
factory Give title lines to many files lacking them Jul 16, 2018
iso3166.tab Fix dead ISO links Feb 28, 2017
leap-seconds.list No leap second on 2018-06-30. Jan 15, 2018
leapseconds.awk Use more up-to-date citation for leap seconds Jul 17, 2017
localtime.c Give title lines to many files lacking them Jul 16, 2018
newctime.3 Use “timezone“ for timestamp histories Jun 27, 2018
newstrftime.3 Give title lines to many files lacking them Jul 16, 2018
newtzset.3 Use “timezone“ for timestamp histories Jun 27, 2018
northamerica Give title lines to many files lacking them Jul 16, 2018
pacificnew Give title lines to many files lacking them Jul 16, 2018
private.h Give title lines to many files lacking them Jul 16, 2018
southamerica Chile changes DST rules from 2019-04-06. Aug 13, 2018
strftime.c Use “timezone“ for timestamp histories Jun 27, 2018
systemv Give title lines to many files lacking them Jul 16, 2018
theory.html Use “timezone“ for timestamp histories Jun 27, 2018
time2posix.3 Document thread-safe functions in man pages. Aug 25, 2014
tz-art.html * tz-art.html: Fix typo in previous change. Jul 6, 2018
tz-how-to.html Use “timezone“ for timestamp histories Jun 27, 2018
tz-link.html * tz-link.html (Precision timekeeping): Mention Huygens. Jun 29, 2018
tzfile.5 Make last time type agree with draft TZif Jun 27, 2018
tzfile.h Give title lines to many files lacking them Jul 16, 2018
tzselect.8 Use “timezone“ for timestamp histories Jun 27, 2018
tzselect.ksh Give title lines to many files lacking them Jul 16, 2018
workman.sh Give title lines to many files lacking them Jul 16, 2018
yearistype.sh Give title lines to many files lacking them Jul 16, 2018
zdump.8 * zdump.8: Stop saying -i is experimental. Jun 27, 2018
zdump.c Give title lines to many files lacking them Jul 16, 2018
zic.8 Use “timezone“ for timestamp histories Jun 27, 2018
zic.c Give title lines to many files lacking them Jul 16, 2018
ziguard.awk Automate building of rearguard tarball Apr 22, 2018
zishrink.awk One line per metadatum in tzdata.zi Jul 31, 2018
zone.tab Use “timezone“ for timestamp histories Jun 27, 2018
zone1970.tab Use “timezone“ for timestamp histories Jun 27, 2018
zoneinfo2tdf.pl Give title lines to many files lacking them Jul 16, 2018

README

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.

See <https://www.iana.org/time-zones/repository/tz-link.html> or the
file tz-link.html for how to acquire the code and data.  Once acquired,
read the comments in the file '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/usr/bin/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.

-----

This file is in the public domain, so clarified as of 2009-05-17 by
Arthur David Olson.  The other files in this distribution are either
public domain or BSD licensed; see the file LICENSE for details.