postgresql

History

Heikki Linnakangas 5d6f43bbeb Add MUST (Mauritius Island Summer Time) to the list of known abbreviations. Mauritius began using DST in the summer 2008-2009; the Olson library has been updated already. Xavier Bugaud		2009-03-05 14:27:50 +00:00
..
data	Update time zone data files to tzdata release 2009a: introduces Asia/Kathmandu	2009-01-29 19:59:59 +00:00
tznames	Add MUST (Mauritius Island Summer Time) to the list of known abbreviations.	2009-03-05 14:27:50 +00:00
Makefile	Fix new timezone cross-compile rule to avoid a bug in gmake 3.78.1;	2009-01-06 02:25:29 +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	Update copyright for 2009.	2009-01-01 17:24:05 +00:00
pgtz.h	Update copyright for 2009.	2009-01-01 17:24:05 +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.