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postgresql/src/timezone
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Tom Lane 16567b0581 Update time zone data files to tzdata release 2010l: DST law changes in 
Egypt and Palestine.  Added new names for two Micronesian timezones:
Pacific/Chuuk is now preferred over Pacific/Truk (and the preferred
abbreviation is CHUT not TRUT) and Pacific/Pohnpei is preferred over
Pacific/Ponape.  Historical corrections for Finland.
 		2010-08-26 19:58:36 +00:00
..
data Update time zone data files to tzdata release 2010l: DST law changes in 2010-08-26 19:58:36 +00:00
tznames Update time zone data files to tzdata release 2010l: DST law changes in 2010-08-26 19:58:36 +00:00
Makefile Split the LDFLAGS make variable into two parts: LDFLAGS is now used for 2010-07-05 18:54:38 +00:00
README Add script to enumerate the timezones in the Windows registry and compare 2010-04-15 11:00:45 +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 Sync timezone code with tzcode 2010c from the Olson group. This fixes some 2010-03-11 18:43:24 +00:00
pgtz.c pgindent run for 9.0, second run 2010-07-06 19:19:02 +00:00
pgtz.h Update copyright for the year 2010. 2010-01-02 16:58:17 +00:00
private.h 8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list 2009-06-11 14:49:15 +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 Sync timezone code with tzcode 2010c from the Olson group. This fixes some 2010-03-11 18:43:24 +00:00
tzfile.h 8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list 2009-06-11 14:49:15 +00:00
zic.c Small adjustment by pgindent. 2010-03-13 00:40:43 +00:00

README 

$PostgreSQL: pgsql/src/timezone/README,v 1.9 2010/04/15 11:00:45 mha 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 2010c.  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.

When there has been a new release of Windows (probably including Service
Packs), the list of matching timezones need to be updated. Run the
script in src/tools/win32tzlist.pl on a Windows machine running this new
release and apply any new timezones that it detects. Never remove any
mappings in case they are removed in Windows, since we still need to
match properly on the old version.