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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2021-10-06 13:38:42 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2021-10-06 13:38:42 -0400 |
| commit | db692b0c84908b4ef5ea4c15fa2d742582ad2cf9 (patch) | |
| tree | 373ab6ea98a10d637d19ea60d1e83a73bfb17da4 | |
| parent | e54a758d24dab056bb7f50d26c57a3c8761cc44a (diff) | |
| download | postgresql-db692b0c84908b4ef5ea4c15fa2d742582ad2cf9.tar.gz postgresql-db692b0c84908b4ef5ea4c15fa2d742582ad2cf9.zip | |
Doc: improve timezone/README's recipe for tracking Windows zones.
We should now cite CLDR as primary reference for the zone name
mapping.
Discussion: https://postgr.es/m/3266414.1633045628@sss.pgh.pa.us
| -rw-r--r-- | src/timezone/README | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/src/timezone/README b/src/timezone/README index f588d1f5add..dd5d5f9892a 100644 --- a/src/timezone/README +++ b/src/timezone/README @@ -45,11 +45,17 @@ and pg_timezone_abbrevs views don't throw errors). It's worth running it as a cross-check on proposed updates. 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. +Packs), findtimezone.c's mapping from Windows zones to IANA zones may +need to be updated. We have two approaches to doing this: +1. Consult the CLDR project's windowsZones.xml file, and add any zones + listed there that we don't have. Use their "territory=001" mapping + if there's more than one IANA zone listed. +2. Run the script in src/tools/win32tzlist.pl on a Windows machine + running the new release, and add any new timezones that it detects. + (This is not a full substitute for #1, though, as win32tzlist.pl + can't tell you which IANA zone to map to.) +In either case, never remove any zone names that have disappeared from +Windows, since we still need to match properly on older versions. Time Zone code |