mirror of
https://github.com/postgres/postgres.git
synced 2025-11-09 00:11:06 -05:00
0169c354bf
POSIX-style timezone specs that don't exactly match any database entry will be treated as having correct USA DST rules. Also, document that this can be changed if you want to use some other DST rules with a POSIX zone spec. We could consider changing localtime.c's TZDEFRULESTRING, but since that facility can only deal with one DST transition rule, it seems fairly useless now; might as well just plan to override it using a "posixrules" entry. Backpatch as far as 8.0. There isn't much we can do in 7.x ... either your libc gets it right, or it doesn't.
This is a PostgreSQL adapted version of the timezone library from: ftp://elsie.nci.nih.gov/pub/tzcode*.tar.gz 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.