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postgres/src/timezone
History
Tom Lane fd84eb5e64
Update time zone data files to tzdata release 2008f (DST law changes in 		18 years ago
..
data Update time zone data files to tzdata release 2008f (DST law changes in 18 years ago
tznames Add SGT (Singapore time) to the default list of known timezone 18 years ago
Makefile More refactoring, so that the SUBSYS.o rules are now all in one place. 18 years ago
README More README src cleanups. 18 years ago
ialloc.c
…
localtime.c
…
pgtz.c Fix identify_system_timezone() so that it tests the behavior of the system 18 years ago
pgtz.h
…
private.h
…
scheck.c
…
strftime.c Fix function prototype to silence compiler warnings. 18 years ago
tzfile.h
…
zic.c
…

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.