Time zone database and code
C HTML Groff Makefile Shell Awk Perl
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.gitignore Go back to lz tarball; improve documentation Aug 30, 2016
CONTRIBUTING * CONTRIBUTING: Call the GitHub repository "development" Nov 11, 2016
LICENSE Go back to lz tarball; improve documentation Aug 30, 2016
Makefile * Makefile, NEWS, tz-link.htm: Mention leap smearing. Dec 2, 2016
NEWS * Makefile, NEWS, tz-link.htm: Mention leap smearing. Dec 2, 2016
README Document the 'version' file Nov 9, 2016
Theory * NEWS, Theory: Document UT. Nov 10, 2016
africa Mention official names for CV, CZ Nov 16, 2016
antarctica * antarctica (Casey): Change to +11 on Oct 22. Oct 30, 2016
asctime.c Fix EOVERFLOW-related problems noted by Chistos Zoulas. Oct 8, 2014
asia New zone Asia/Atyrau Nov 7, 2016
australasia More Tongan commentary fixes Oct 27, 2016
backward Rename Asia/Rangoon to Asia/Yangon Sep 8, 2016
backzone Prefer UT +-NN notation for UT-offset time zones in comments. Aug 25, 2016
checklinks.awk Clarify licensing status Dec 8, 2015
checktab.awk checktab.awk: don't repeat missing comment errors Feb 13, 2016
date.1 Port 'date' better to POSIX 1003.1-2001 and later Jul 29, 2015
date.c port 'environ' decl to Solaris 10 Sep 5, 2016
difftime.c Avoid unnecessary casts in difftime Jul 27, 2015
etcetera Phase out alphanumeric abbrs from etcetera Aug 23, 2016
europe Cite Saratov law for next month’s change Nov 22, 2016
factory Spelling fixes Aug 24, 2016
iso3166.tab * iso3166.tab: Accent "Curaçao". (Thanks to Jiri Bohac.) Nov 16, 2016
leap-seconds.list Positive leap second on 2016-12-31 Jul 19, 2016
leapseconds.awk Update leap-seconds file expiration Feb 22, 2016
localtime.c * localtime.c (time): Explain naming. Oct 22, 2016
newctime.3 Add documentation for the core NetBSD-inspired functions. Aug 26, 2014
newstrftime.3 Clarify licensing status Dec 8, 2015
newtzset.3 Document TZ=<...> in newtzset.3 Aug 19, 2016
northamerica * NEWS, northamerica: Mention "day of two noons". Sep 21, 2016
pacificnew Switch back to ASCII for symbols. Jun 20, 2014
private.h Enable port to AmigaOS Oct 22, 2016
southamerica Prefer +-NN notation for UT-offset time zones in comments. Aug 23, 2016
strftime.c Port better to Solaris 10 Oct 4, 2016
systemv Simplify use of URLs in text files. Jun 16, 2014
time2posix.3 Document thread-safe functions in man pages. Aug 25, 2014
tz-art.htm * tz-art.htm (Comics): Add today's Pearls Before Swine. Nov 6, 2016
tz-how-to.html Call the new tarball experimental Sep 6, 2016
tz-link.htm * Makefile, NEWS, tz-link.htm: Mention leap smearing. Dec 2, 2016
tzfile.5 Fix bug with Casablanca in late 2037 Aug 5, 2016
tzfile.h Use bool for boolean. Aug 25, 2014
tzselect.8 Rename time.tab to zone1970.tab. Jul 31, 2014
tzselect.ksh tzselect: fix Julian-day TZ validation bug Mar 6, 2016
workman.sh Simplify use of URLs in text files. Jun 16, 2014
yearistype.sh Distinguish hyphen from minus from dashes. Jun 18, 2014
zdump.8 zdump -i: use colons and tabs in output Aug 22, 2016
zdump.c Pacify clang -Wtautological-compare Nov 6, 2016
zic.8 Fix "-"s in zic man page with Bell Labs troff May 29, 2016
zic.c Add zic.c comment Nov 4, 2016
zone.tab Minor Russian corrections Nov 11, 2016
zone1970.tab Minor Russian corrections Nov 11, 2016
zoneinfo2tdf.pl Rename fields of Link lines for clarity. Aug 17, 2014


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.htm 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/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

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.