Re: [POLL] Proposed syntax for timestamps with time zone info

[Stefan Nobis]

<tomas@tuxteam.de> writes:

> 2023-03-23 02:30 @Europe/Berlin refers to /two/ points in time, thus
> it /is/ ambiguous.

As far as I understand the definitions, the point in time "2023-03-23
02:30 @Europe/Berlin" is clearly defined as 2023-03-23 02:30 UTC+0100.

A bit more problematic would be "2023-03-26 02:30 @Europe/Berlin".
Strictly speaking, this point in time does not exist, because in the
night from 2023-03-25 to 2023-03-26 the clock will jump from 02:00
directly to 03:00 in the time zone Europe/Berlin. Therefore the
/interpretation/ of this timestamp is ambiguous.

The real problem would be e.g. "2023-10-29 02:30 @Europe/Berlin". This
point in time really exist twice, there is 02A:30 (02:30 UTC+0200) and
02B:30 (02:30 UTC+0100) in this night of switching back from DST to
normal time!

So, in general, only using the time zone name may indeed lead to
ambiguous interpretations of timestamps.

-- 
Until the next mail...,
Stefan.