| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Timestamp with vs without time zone. |
| Date: | 2021-09-21 19:58:13 |
| Message-ID: | CAKFQuwZoiV=N9sWXMvonqu7uuRrdqhYjkCXC8jAWzruUPd+-_g@mail.gmail.com |
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| Lists: | pgsql-general |
On Tuesday, September 21, 2021, Peter J. Holzer <hjp-pgsql(at)hjp(dot)at> wrote:
>
> These two values are completely indistinguishable. That's good for a
> timestamp (they are the same time after all). But they are not a
> "timestamp with time zone". The time zone is not part of the value but
> of the environment.
>
No, it’s inherent to the data type itself. The data type has an implied
time zone of UTC. That is a reasonable definition of “with” in my book.
If I see “20:05” I need to know the type of data to know whether its a time
or interval - values without types are incomplete. i.e., the type can
supply relevant context, like a reference time zone.
David J.
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