| From: | Andrey Borodin <x4mmm(at)yandex-team(dot)ru> |
|---|---|
| To: | Aleksander Alekseev <aleksander(at)timescale(dot)com> |
| Cc: | pgsql-hackers mailing list <pgsql-hackers(at)postgresql(dot)org>, Przemysław Sztoch <przemyslaw(at)sztoch(dot)pl>, Sergey Prokhorenko <sergeyprokhorenko(at)yahoo(dot)com(dot)au>, Jelte Fennema-Nio <postgres(at)jeltef(dot)nl>, Nick Babadzhanian <pgnickb(at)gmail(dot)com>, Mat Arye <mat(at)timescaledb(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Daniel Gustafsson <daniel(at)yesql(dot)se>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, Nikolay Samokhvalov <samokhvalov(at)gmail(dot)com>, "Kyzer Davis (kydavis)" <kydavis(at)cisco(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, "brad(at)peabody(dot)io" <brad(at)peabody(dot)io>, Kirk Wolak <wolakk(at)gmail(dot)com> |
| Subject: | Re: UUID v7 |
| Date: | 2024-01-18 18:31:10 |
| Message-ID: | 9CE1E513-B11A-4C59-980E-D61EC56716E7@yandex-team.ru |
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| Lists: | pgsql-hackers |
> On 18 Jan 2024, at 20:39, Andrey Borodin <x4mmm(at)yandex-team(dot)ru> wrote:
>
> But 164555774200000ns after 1582-10-15 00:00:00 UTC was 2022-02-22 19:22:22 UTC. And that was 2022-02-23 00:22:22 in UTC-05.
'2022-02-22 19:22:22 UTC' is exactly that moment which was encoded into example UUIDs. It's not '2022-02-23 00:22:22 in UTC-05' as I thought.
I got confused by "at timezone" changes which in fact removes timezone information. And that's per SQL standard...
Now I'm completely lost in time... I've set local time to NY (UTC-5).
postgres=# select TIMESTAMP WITH TIME ZONE '2022-02-22 14:22:22-05' - TIMESTAMP WITH TIME ZONE 'Tuesday, February 22, 2022 2:22:22.00 PM GMT-05:00';
?column?
----------
10:00:00
(1 row)
postgres=# select TIMESTAMP WITH TIME ZONE 'Tuesday, February 22, 2022 2:22:22.00 PM GMT-05:00';
timestamptz
------------------------
2022-02-22 04:22:22-05
(1 row)
I cannot wrap my mind around it... Any pointers would be appreciated.
I'm certain that code extracted UTC time correctly, I just want a reliable test that verifies timestamp constant (+ I understand what is going on).
Best regards, Andrey Borodin.
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