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

[Ihor Radchenko]

Jean Louis <bugs@gnu.support> writes:

>> The problems of daylight savings transition points is fairly well
>> understood and I think it is fairly well accepted that there is
>> ambiguity arising from the use of daylight savings.
>
> The only ambiguity is if you miss to understand that "time zone"
> definition already contains specification of daylight savings.
>
> If you do understand it, then there will be no ambiguity at all.

You are incorrect here. In such scenarios, time zone name must also be
accompanied by DST flag. Just supplying the time zone is not enough.

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.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
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