Re: POSIX TS spec reverses the meaning of TZ offset compared to ISO (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda)

[Max Nikulin]

On 02/02/2023 15:34, Ihor Radchenko wrote:
> Max Nikulin writes:
> > Is there a strong reason to support POSIX TZ? Time zones with fixed
> > offsets are available as e.g. Etc/GMT-8 (unfortunately inverted sign as
> > well).
>
> Because `encode-time' accepts POSIX TZ as argument. So, may as well.
> Note that Etc/GMT-8 is also accepted as POSIX TZ.

"May" does not assume "should". I am leaving final decision to the 
person who will implement it though. I hope, there is no problem with 
such syntax on windows.

The disappointing issue with POSIX syntax is the case of decision of 
authorities to change time zone offset. It is neither regular DST rule 
nor constant offset. The result is incorrect mapping between UTC and 
local time.