1ba2b2efdSGlen BarberREADME for the tz distribution 2ba2b2efdSGlen Barber 3ad48359aSPhilip Paeps"Where do I set the hands of the clock?" -- Les Tremayne as The King 4ad48359aSPhilip Paeps"Oh that--you can set them any place you want." -- Frank Baxter as The Scientist 5ba2b2efdSGlen Barber (from the Bell System film "About Time") 6ba2b2efdSGlen Barber 789abb9f8SPhilip PaepsThe Time Zone Database (called tz, tzdb or zoneinfo) contains code and 8ba2b2efdSGlen Barberdata that represent the history of local time for many representative 9ba2b2efdSGlen Barberlocations around the globe. It is updated periodically to reflect 10ba2b2efdSGlen Barberchanges made by political bodies to time zone boundaries, UTC offsets, 11ba2b2efdSGlen Barberand daylight-saving rules. 12ba2b2efdSGlen Barber 13e350c46aSBaptiste DaroussinSee <https://www.iana.org/time-zones/repository/tz-link.html> or the 14*eebb9c2cSPhilip Paepsfile tz-link.html for how to acquire the code and data. 15ba2b2efdSGlen Barber 16*eebb9c2cSPhilip PaepsOnce acquired, read the leading comments in the file "Makefile" 17*eebb9c2cSPhilip Paepsand make any changes needed to make things right for your system, 18*eebb9c2cSPhilip Paepsespecially when using a platform other than current GNU/Linux. 19*eebb9c2cSPhilip Paeps 20*eebb9c2cSPhilip PaepsThen run the following commands, substituting your desired 21*eebb9c2cSPhilip Paepsinstallation directory for "$HOME/tzdir": 22*eebb9c2cSPhilip Paeps 23*eebb9c2cSPhilip Paeps make TOPDIR="$HOME/tzdir" install 24*eebb9c2cSPhilip Paeps "$HOME/tzdir/usr/bin/zdump" -v America/Los_Angeles 25ba2b2efdSGlen Barber 2612a899b6SPhilip PaepsSee the file tz-how-to.html for examples of how to read the data files. 2712a899b6SPhilip Paeps 2889abb9f8SPhilip PaepsThis database of historical local time information has several goals: 29ba2b2efdSGlen Barber 3089abb9f8SPhilip Paeps * Provide a compendium of data about the history of civil time that 3189abb9f8SPhilip Paeps is useful even if not 100% accurate. 32ba2b2efdSGlen Barber 3389abb9f8SPhilip Paeps * Give an idea of the variety of local time rules that have existed 3489abb9f8SPhilip Paeps in the past and thus may be expected in the future. 35ba2b2efdSGlen Barber 3689abb9f8SPhilip Paeps * Test the generality of the local time rule description system. 37ba2b2efdSGlen Barber 38ba2b2efdSGlen BarberThe information in the time zone data files is by no means authoritative; 39ba2b2efdSGlen Barberfixes and enhancements are welcome. Please see the file CONTRIBUTING 40ba2b2efdSGlen Barberfor details. 41ba2b2efdSGlen Barber 42ba2b2efdSGlen BarberThanks to these Time Zone Caballeros who've made major contributions to the 43ba2b2efdSGlen Barbertime conversion package: Keith Bostic; Bob Devine; Paul Eggert; Robert Elz; 44ba2b2efdSGlen BarberGuy Harris; Mark Horton; John Mackin; and Bradley White. Thanks also to 45ba2b2efdSGlen BarberMichael Bloom, Art Neilson, Stephen Prince, John Sovereign, and Frank Wales 46ba2b2efdSGlen Barberfor testing work, and to Gwillim Law for checking local mean time data. 47ba2b2efdSGlen BarberThanks in particular to Arthur David Olson, the project's founder and first 48ba2b2efdSGlen Barbermaintainer, to whom the time zone community owes the greatest debt of all. 49ba2b2efdSGlen BarberNone of them are responsible for remaining errors. 50ba2b2efdSGlen Barber 51ba2b2efdSGlen Barber----- 52ba2b2efdSGlen Barber 53ba2b2efdSGlen BarberThis file is in the public domain, so clarified as of 2009-05-17 by 54ba2b2efdSGlen BarberArthur David Olson. The other files in this distribution are either 55ba2b2efdSGlen Barberpublic domain or BSD licensed; see the file LICENSE for details. 56