Horton

Re: UUID v7

David G. Johnston <david.g.johnston@gmail.com>

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From: "David G. Johnston" <david.g.johnston@gmail.com>
To: Andrey Borodin <x4mmm@yandex-team.ru>
Cc: Aleksander Alekseev <aleksander@timescale.com>, pgsql-hackers mailing list <pgsql-hackers@postgresql.org>, Przemysław Sztoch <przemyslaw@sztoch.pl>, Sergey Prokhorenko <sergeyprokhorenko@yahoo.com.au>, Jelte Fennema-Nio <postgres@jeltef.nl>, Nick Babadzhanian <pgnickb@gmail.com>, Mat Arye <mat@timescaledb.com>, Peter Eisentraut <peter.eisentraut@enterprisedb.com>, Tom Lane <tgl@sss.pgh.pa.us>, Daniel Gustafsson <daniel@yesql.se>, Matthias van de Meent <boekewurm+postgres@gmail.com>, Nikolay Samokhvalov <samokhvalov@gmail.com>, "Kyzer Davis (kydavis)" <kydavis@cisco.com>, Andres Freund <andres@anarazel.de>, "brad@peabody.io" <brad@peabody.io>, Kirk Wolak <wolakk@gmail.com>
Date: 2024-01-19T03:24:23Z
Lists: pgsql-hackers 
On Thu, Jan 18, 2024 at 11:31 AM Andrey Borodin <x4mmm@yandex-team.ru>
wrote:

>
> 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)
>
>
You are mixing POSIX and ISO-8601 conventions and, as noted in our
appendix, they disagree on the direction that is positive.

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.)

David J.

Commits

  1. Fix timestamp overflow in UUIDv7 implementation.

  2. Add UUID version 7 generation function.

  3. Add some UUID support functions