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help / color / mirror / Atom feedFrom: David G. Johnston <[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 20:07:54 -0700
Message-ID: <CAKFQuwZgkaqZK5QNPceV090A4FW-PU384jbq_Tm6nt34-qeXYw@mail.gmail.com> (raw)
In-Reply-To: <OSBPR01MB29975FFDA1D860B20A8AC85C9B802@OSBPR01MB2997.jpnprd01.prod.outlook.com>
References: <OSBPR01MB299716C895A69A6DFCF3357C9B812@OSBPR01MB2997.jpnprd01.prod.outlook.com>
<OSBPR01MB29975FFDA1D860B20A8AC85C9B802@OSBPR01MB2997.jpnprd01.prod.outlook.com>
On Mon, Apr 28, 2025 at 7:40 PM H Witt <[email protected]> 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|
>
When you write the former you get the POSIX convention for sign meaning (+
== West). When you write the latter you get the ISO convention (+ == East)
https://www.postgresql.org/docs/current/datetime-posix-timezone-specs.html
Since people expect ISO conventions you should stick to using the zone
names and forget explicit offsets (and even the abbreviations for good
measure) even exist.
David J.
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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: <CAKFQuwZgkaqZK5QNPceV090A4FW-PU384jbq_Tm6nt34-qeXYw@mail.gmail.com>
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