| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | ysangkok(at)gmail(dot)com, Pg Docs <pgsql-docs(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Second-granular timezone offset format not documented |
| Date: | 2021-07-05 06:12:30 |
| Message-ID: | CA+hUKGK6BNyxbaynMdp6bGgsik+x9Q0hnKvZxgFd3HkPC=ko2w@mail.gmail.com |
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| Lists: | pgsql-docs |
On Mon, Jul 5, 2021 at 9:56 AM PG Doc comments form
<noreply(at)postgresql(dot)org> wrote:
> Note how the response has a very weird timezone offset. I guess it is valid,
As for whether it's valid, that's coming from the IANA tz dataset. It
has a moment that it believes standard time to have begun at each
location, in this case:
Z America/Mexico_City -6:36:36 - LMT 1922 Ja 1 0:23:24
https://en.wikipedia.org/wiki/Time_in_Mexico#History seems to agree on
the year at least. That "local mean time" offset is computed from the
location's longitude, for lack of anything better. The tzinfo
"Theory" file has a bunch of disclaimers about pre-1970 data though,
including "the tz database's LMT offsets should not be considered
meaningful".
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