postgresql

History

Tom Lane 8c3340fe16 Fix identify_system_timezone() so that it tests the behavior of the system timezone setting in the current year and for 100 years back, rather than always examining years 1904-2004. The original coding would have problems distinguishing zones whose behavior diverged only after 2004; which is a situation we will surely face sometime, if it's not out there already. In passing, also prevent selection of the dummy "Factory" timezone, even if that's exactly what the system is using. Reporting time as GMT seems better than that.		2008-07-01 03:40:55 +00:00
..
data	Update time zone data files to tzdata release 2008c (DST law changes in	2008-06-01 18:23:00 +00:00
tznames	Add SGT (Singapore time) to the default list of known timezone	2008-05-01 20:05:08 +00:00
Makefile	More refactoring, so that the SUBSYS.o rules are now all in one place.	2008-02-19 15:29:58 +00:00
README	More README src cleanups.	2008-03-21 13:23:29 +00:00
ialloc.c	Update timezone code to track the upstream changes since 2003. In particular	2008-02-16 21:16:04 +00:00
localtime.c	Update timezone code to track the upstream changes since 2003. In particular	2008-02-16 21:16:04 +00:00
pgtz.c	Fix identify_system_timezone() so that it tests the behavior of the system	2008-07-01 03:40:55 +00:00
pgtz.h	Update timezone code to track the upstream changes since 2003. In particular	2008-02-16 21:16:04 +00:00
private.h	Update timezone code to track the upstream changes since 2003. In particular	2008-02-16 21:16:04 +00:00
scheck.c	Update timezone code to track the upstream changes since 2003. In particular	2008-02-16 21:16:04 +00:00
strftime.c	Fix function prototype to silence compiler warnings.	2008-02-19 12:06:35 +00:00
tzfile.h	Update timezone code to track the upstream changes since 2003. In particular	2008-02-16 21:16:04 +00:00
zic.c	Update timezone code to track the upstream changes since 2003. In particular	2008-02-16 21:16:04 +00:00

README

$PostgreSQL: pgsql/src/timezone/README,v 1.7 2008/03/21 13:23:29 momjian Exp $

Timezone
========

This is a PostgreSQL adapted version of the timezone library from:

	ftp://elsie.nci.nih.gov/pub/tzcode*.tar.gz

The code is currently synced with release 2007k.  There are many cosmetic
(and not so cosmetic) differences from the original tzcode library, but
diffs in the upstream version should usually be propagated to our version.

The data files under data/ are an exact copy of the latest data set from:

	ftp://elsie.nci.nih.gov/pub/tzdata*.tar.gz

Since time zone rules change frequently in some parts of the world,
we should endeavor to update the data files before each PostgreSQL
release.

At each update, we should check if time zone offsets have changed.
Just search for the current or previous year and see what has changed.
Sometimes a country changes its time zone offsets, for example Georgia
in 2004.  Just grepping in the zic database files for 2004 is enough to
spot such a change.  Then the files under tznames/ should be updated.