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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: Fri, 20 Jan 2023 10:37:10 -1000
User-agent: mu4e 1.6.10; emacs 27.1

Aloha Max,

Max Nikulin <manikulin@gmail.com> writes:

On 20/01/2023 23:09, Thomas S. Dye wrote:
Max Nikulin writes:
Now, if Amsterdam's timezone arbitrarily changes its relation to UTC before the conference takes place, then everyone who participates in the conference must notice this (or miss the
start of the conference).
My point is that if timestamp is stored in UTC than it becomes 
incorrect in the
case of time offset change. If such timestamp is stored as local 
time + time
zone identifier then application presenting the timestamp to 
users will show
correct time as soon as zoneinfo data is updated.

A virtual conference is organized by someone in Amsterdam, who sets a start time corresponding to 9AM in Amsterdam at a date some years in the future and invites participants from all over the world.  Now, if Amsterdam's timezone arbitrarily changes its relation to UTC before the conference takes place, then must everyone notice this?  Or, should Org, from the time the arbitrary change is made public, simply adjust the conference time for all the
participants in the Amsterdam timezone?
Both variants are possible and a planning application should 
support them. It is
matter of negotiation between the committee and the 
participants. Timestamp
should be stored in UTC only in one case.
Agreed.  So, IIUC, there are three cases:

1) Occurrence, where the timestamp includes UTC;
2) Event relative to user, where the timestamp does not include UTC or a time zone; and 3) Event not relative to user, where the timestamp includes the relevant time zone.
For completeness, Case 3 might benefit from a procedure to change 
the relevant time zone.  For instance, when the boss has scheduled 
time for you at 9:00 AM her time, but doesn't know where she will 
be on that day.
hth,
Tom

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



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