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