mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-02 08:42:48 +00:00
56 lines
2.4 KiB
Plaintext
56 lines
2.4 KiB
Plaintext
README for the tz distribution
|
|
|
|
"Where do I set the hands of the clock?" -- Les Tremayne as The King
|
|
"Oh that--you can set them any place you want." -- Frank Baxter as The Scientist
|
|
(from the Bell System film "About Time")
|
|
|
|
The Time Zone Database (called tz, tzdb 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 leading comments in the file "Makefile"
|
|
and make any changes needed to make things right for your system,
|
|
especially when using a platform other than current 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
|
|
|
|
See the file tz-how-to.html for examples of how to read the data files.
|
|
|
|
This database of historical local time information has several goals:
|
|
|
|
* 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 may be expected in the future.
|
|
|
|
* Test 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.
|