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postgres/src/timezone
History
Tom Lane 16567b0581
Update time zone data files to tzdata release 2010l: DST law changes in 		15 years ago
..
data Update time zone data files to tzdata release 2010l: DST law changes in 15 years ago
tznames Update time zone data files to tzdata release 2010l: DST law changes in 15 years ago
Makefile Split the LDFLAGS make variable into two parts: LDFLAGS is now used for 15 years ago
README Add script to enumerate the timezones in the Windows registry and compare 16 years ago
ialloc.c Update timezone code to track the upstream changes since 2003. In particular 18 years ago
localtime.c Sync timezone code with tzcode 2010c from the Olson group. This fixes some 16 years ago
pgtz.c pgindent run for 9.0, second run 15 years ago
pgtz.h Update copyright for the year 2010. 16 years ago
private.h 8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list 17 years ago
scheck.c Update timezone code to track the upstream changes since 2003. In particular 18 years ago
strftime.c Sync timezone code with tzcode 2010c from the Olson group. This fixes some 16 years ago
tzfile.h 8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list 17 years ago
zic.c Small adjustment by pgindent. 16 years ago

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.