> On 18 Jan 2024, at 20:39, Andrey Borodin <
x4mmm@yandex-team.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.