Re: [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda)

[Max Nikulin]

On 01/02/2023 23:45, Ihor Radchenko wrote:
> Note how `encode-time' TIME argument has both DST flag and the time zone
> name:
>
>     (SECOND MINUTE HOUR DAY MONTH YEAR IGNORED DST ZONE)
>
> DST is necessary exactly in the ambiguous situations like I described,
> when we must know if day saving time is in effect or not __in addition__
> to time zone name.

Warning: just be aware that sometimes DST is not enough to resolve 
ambiguity. E.g. in the following example attempt to pass non-nil DST 
signals an error:

zdump -v Africa/Juba | grep 2021
Africa/Juba  Sun Jan 31 20:59:59 2021 UT = Sun Jan 31 23:59:59 2021 EAT 
isdst=0 gmtoff=10800
Africa/Juba  Sun Jan 31 21:00:00 2021 UT = Sun Jan 31 23:00:00 2021 CAT 
isdst=0 gmtoff=7200