1 1.2 kre # Global Time Zone Database (global-tz) 2 1.2 kre 3 1.2 kre The Global Time Zone Database contains the history of how local time has changed around the world. 4 1.2 kre It is derived from data in the [IANA Time Zone Database](https://github.com/eggert/tz). 5 1.2 kre For many years this information could be reliably obtained from the IANA repository. 6 1.2 kre In recent years however, the data available by default from the IANA repository has been reduced. 7 1.2 kre This repository primarily exists to reinstate the data that has been effectively removed. 8 1.2 kre 9 1.2 kre For more info, please see the project home page: 10 1.2 kre https://github.com/JodaOrg/global-tz 11 1.2 kre 12 1.2 kre The original README is included below. 13 1.2 kre 14 1.2 kre ----- 15 1.2 kre 16 1.1 apb README for the tz distribution 17 1.1 apb 18 1.3 kre Where do I set the hands of the clock? Les Tremayne as The King 19 1.3 kre Oh that you can set them any place you want. Frank Baxter as The Scientist 20 1.3 kre (from the Bell System film About Time) 21 1.1 apb 22 1.2 kre The Time Zone Database (called tz, tzdb or zoneinfo) contains code and 23 1.1 apb data that represent the history of local time for many representative 24 1.1 apb locations around the globe. It is updated periodically to reflect 25 1.1 apb changes made by political bodies to time zone boundaries, UTC offsets, 26 1.1 apb and daylight-saving rules. 27 1.1 apb 28 1.2 kre See <https://www.iana.org/time-zones/repository/tz-link.html> or the 29 1.2 kre file tz-link.html for how to acquire the code and data. 30 1.2 kre 31 1.3 kre Once acquired, read the leading comments in the file Makefile 32 1.2 kre and make any changes needed to make things right for your system, 33 1.2 kre especially when using a platform other than current GNU/Linux. 34 1.2 kre 35 1.2 kre Then run the following commands, substituting your desired 36 1.3 kre installation directory for $HOME/tzdir: 37 1.2 kre 38 1.2 kre make TOPDIR="$HOME/tzdir" install 39 1.2 kre "$HOME/tzdir/usr/bin/zdump" -v America/Los_Angeles 40 1.2 kre 41 1.2 kre See the file tz-how-to.html for examples of how to read the data files. 42 1.2 kre 43 1.2 kre This database of historical local time information has several goals: 44 1.2 kre 45 1.2 kre * Provide a compendium of data about the history of civil time that 46 1.2 kre is useful even if not 100% accurate. 47 1.2 kre 48 1.2 kre * Give an idea of the variety of local time rules that have existed 49 1.2 kre in the past and thus may be expected in the future. 50 1.1 apb 51 1.2 kre * Test the generality of the local time rule description system. 52 1.1 apb 53 1.1 apb The information in the time zone data files is by no means authoritative; 54 1.2 kre fixes and enhancements are welcome. Please see the file CONTRIBUTING 55 1.2 kre for details. 56 1.1 apb 57 1.3 kre Thanks to these Time Zone Caballeros whove made major contributions to the 58 1.2 kre time conversion package: Keith Bostic; Bob Devine; Paul Eggert; Robert Elz; 59 1.1 apb Guy Harris; Mark Horton; John Mackin; and Bradley White. Thanks also to 60 1.1 apb Michael Bloom, Art Neilson, Stephen Prince, John Sovereign, and Frank Wales 61 1.1 apb for testing work, and to Gwillim Law for checking local mean time data. 62 1.3 kre Thanks in particular to Arthur David Olson, the projects founder and first 63 1.2 kre maintainer, to whom the time zone community owes the greatest debt of all. 64 1.1 apb None of them are responsible for remaining errors. 65 1.1 apb 66 1.2 kre ----- 67 1.1 apb 68 1.2 kre This file is in the public domain, so clarified as of 2009-05-17 by 69 1.2 kre Arthur David Olson. The other files in this distribution are either 70 1.2 kre public domain or BSD licensed; see the file LICENSE for details. 71
Indexes created Sun Aug 16 00:25:19 UTC 2026