Hi Andrey,
> > Timestamp and TimestampTz are absolutely the same thing.
> My question is not about Postgres data types. I'm asking about examples in the standard.
>
> There's an example 017F22E2-79B0-7CC3-98C4-DC0C0C07398F. It is expected to be generated on "Tuesday, February 22, 2022 2:22:22.00 PM GMT-05:00".
> It's exaplained to be 164555774200000ns after 1582-10-15 00:00:00 UTC.
>
> 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.
Not 100% sure which text you are referring to exactly, but I'm
guessing it's section B.2 of [1]
"""
This example UUIDv7 test vector utilizes a well-known 32 bit Unix
epoch with additional millisecond precision to fill the first 48 bits
[...]
The timestamp is Tuesday, February 22, 2022 2:22:22.00 PM GMT-05:00
represented as 0x17F22E279B0 or 1645557742000
"""
If this is the case, I think the example is indeed wrong:
```
=# select extract(epoch from 'Tuesday, February 22, 2022 2:22:22.00 PM
GMT-05:00' :: timestamptz)*1000;
?column?
----------------------
1645521742000.000000
(1 row)
```
And the difference between the value in the text and the actual value
is 10 hours as you pointed out.
Also you named the date 1582-10-15 00:00:00 UTC. Maybe you actually
meant 1970-01-01 00:00:00 UTC?
[1]:
https://www.ietf.org/archive/id/draft-peabody-dispatch-new-uuid-format-04.html--
Best regards,
Aleksander Alekseev