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Re: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-ag


From: Thomas S. Dye
Subject: Re: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda
Date: Sat, 28 Jan 2023 20:21:48 -1000
User-agent: mu4e 1.6.10; emacs 27.1


Jean Louis <bugs@gnu.support> writes:

Time offset does not independently exists without time zone. While you represent it without time zone, you have to observe time zone first,
before deriving time offset from it.


UTC offset exists without time zone. UTC is absolute time and offsets from it do not refer to political time in a time zone. They refer to local *solar time* at a particular place.
Read from:
https://en.wikipedia.org/wiki/UTC_offset

,----
| Daylight saving time
| | Several regions of the world use daylight saving time (DST) and the | UTC offset during this season is typically obtained by adding one hour | to local standard time. Central European Time UTC+01:00 is replaced by | Central European Summer Time UTC+02:00, and Pacific Standard Time
| UTC−08:00 is replaced by Pacific Daylight Time UTC−07:00.
`----

Your wikipedia citation puts it like this: "The UTC offset (or time offset) is an amount of time subtracted from or added to Coordinated Universal Time (UTC) time to specify the local solar time (which may not be the current civil time, whether it is standard time or daylight saving time)."

Note that the quote distinguishes UTC offset from standard time and daylight saving time, which refer to time zones.

This distinction between absolute time (solar time) and space/time (time zone) is fundamental. Confusing them leads to no good.

hth,
Tom

--
Thomas S. Dye
https://tsdye.online/tsdye



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