On Tue, 20 Oct 2026 at 15:45, Tom Lane <[email protected]> wrote: > > David Rowley <[email protected]> writes: > > Assume that's what you meant? > > No, I was a bit mystified by these printouts: > > Timezone Central Asia Standard Time changed displayname ('(UTC+06:00) > Bishkek' from '(UTC+06:00) Astana')! > Timezone Greenland Standard Time changed displayname ('(UTC-02:00) Greenland' > from '(UTC-03:00) Greenland')! > Timezone Greenwich Standard Time changed displayname ('(UTC+00:00) Monrovia, > Reykjavik' from 'Windows uses this zone name in various places that lie near > the prime meridian, but are not in the UK. However, most people probably > think that "Greenwich" means UK civil time, or maybe even straight-up UTC. > Atlantic/Reykjavik is a decent match for that interpretation because Iceland > hasn't observed DST since 1968. / / (UTC+00:00) Monrovia, Reykjavik')! > Timezone Jerusalem Standard Time changed displayname ('(UTC+02:00) Jerusalem' > from '(UTC+02:00) Jerusalem (old spelling of zone name)')! > Timezone Jordan Standard Time changed displayname ('(UTC+03:00) Amman' from > '(UTC+02:00) Amman')! > Timezone Morocco Standard Time changed displayname ('(UTC+00:00) Casablanca' > from '(UTC+01:00) Casablanca')! > Timezone Mountain Standard Time (Mexico) changed displayname ('(UTC-07:00) La > Paz, Mazatlan' from '(UTC-07:00) Chihuahua, La Paz, Mazatlan')! > Timezone Paraguay Standard Time changed displayname ('(UTC-03:00) Asuncion' > from '(UTC-04:00) Asuncion')! > Timezone Qyzylorda Standard Time changed displayname ('(UTC+05:00) Astana' > from '(UTC+05:00) Qyzylorda')! > Timezone Syria Standard Time changed displayname ('(UTC+03:00) Damascus' from > '(UTC+02:00) Damascus')! > Timezone Volgograd Standard Time changed displayname ('(UTC+03:00) Volgograd' > from '(UTC+04:00) Volgograd')!
They're variations from what's in findtimezone.c and the corresponding Windows registry key. > The report for Greenwich Standard Time is probably explainable by our > having this commentary in findtimezone.c: > > /* > * Windows uses this zone name in various places that lie near the > * prime meridian, but are not in the UK. However, most people > * probably think that "Greenwich" means UK civil time, or maybe even > * straight-up UTC. Atlantic/Reykjavik is a decent match for that > * interpretation because Iceland hasn't observed DST since 1968. > */ > /* (UTC+00:00) Monrovia, Reykjavik */ Yeah, the regex in win32tzlist.pl must be merging the comments. I guess we could adjust that to only look at the last block comment. > and the Jerusalem report also visibly traces to our own commentary. > But the ones where the claimed UTC offset changes don't appear to me > to match up to anything. I didn't look at all, but did check Europe/Volgograd, and I'm not an expert at reading tzdata.zi, but doesn't the following mean they changed to UTC+3 in 2020? 4 - %z 2020 D 27 2s 3 - MSK If so, isn't Microsoft's "(UTC+03:00) Volgograd" correct here? The 2020 change seems to be mentioned in [1]. David [1] https://www.timeanddate.com/time/zone/russia/volgograd?year=2020
