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help / color / mirror / Atom feedFrom: Bruce Momjian <[email protected]>
To: H Witt <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: why at time zone tz_offset not equal tz_name? tz_name has same offset in pg_timezone_names
Date: Mon, 28 Apr 2025 23:09:38 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <OSBPR01MB29975FFDA1D860B20A8AC85C9B802@OSBPR01MB2997.jpnprd01.prod.outlook.com>
References: <OSBPR01MB299716C895A69A6DFCF3357C9B812@OSBPR01MB2997.jpnprd01.prod.outlook.com>
<OSBPR01MB29975FFDA1D860B20A8AC85C9B802@OSBPR01MB2997.jpnprd01.prod.outlook.com>
On Tue, Apr 29, 2025 at 02:40:45AM +0000, H Witt wrote:
> select
> '2025-02-03 15:04:05'::timestamptz at time zone '+08:00',
> '2025-02-03 15:04:05'::timestamptz at time zone 'Asia/Shanghai'
>
> display
> |2025-02-02 23:04:05.000|2025-02-03 15:04:05.000|
The sign is wrong in the first column:
SELECT
'2025-02-03 15:04:05'::timestamptz at time zone '-08:00',
'2025-02-03 15:04:05'::timestamptz at time zone 'Asia/Shanghai'
;
timezone | timezone
---------------------+---------------------
2025-02-04 04:04:05 | 2025-02-04 04:04:05
See:
https://www.postgresql.org/docs/current/datetime-posix-timezone-specs.html
The offset fields specify the hours, and optionally minutes and
seconds, difference from UTC. They have the format hh[:mm[:ss]]
optionally with a leading sign (+ or -). The positive sign is used
for zones west of Greenwich. (Note that this is the opposite of
the ISO-8601 sign convention used elsewhere in PostgreSQL.) hh
can have one or two digits; mm and ss (if used) must have two.
--
Bruce Momjian <[email protected]> https://momjian.us
EDB https://enterprisedb.com
Do not let urgent matters crowd out time for investment in the future.
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To: [email protected]
Cc: [email protected], [email protected], [email protected]
Subject: Re: why at time zone tz_offset not equal tz_name? tz_name has same offset in pg_timezone_names
In-Reply-To: <[email protected]>
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