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

[Max Nikulin <manikulin@gmail.com>]

On 20/01/2023 03:09, Tim Cross wrote:
> To reiterate for the last time, there are 2 clear and different use
> cases for timestamps associated with meetings.
> 
> 1. A meeting timestamp for a meeting where all the participants are in
> the same time zone.
...> 2. A meeting timestamp for a meeting where all the participants are in
> different time zones....

Tim, every scheduled meeting event is associated with some particular 
time zone, often implicitly. So it is single use case.

It is up to participants to negotiate which timezone is the primary one 
for each event. It is matter of people communication, not technical issue.

First Monday 15:00 is (almost) equally precise for
- Australia/Canberra having DST
- Australia/Darwin where currently no DST
- +1000 (the highest chance of improper use unfortunately)
- UTC

Aside from time transition intervals, it is possible to take any of this 
variant and to present time local for other participant across the globe.

Storage timezone may differ from the current user preference which time 
zone should be used to display timestamp or to export it.

The problem arises when several participants believe that their 
timezones are primary ones and they do not sync their schedules through 
a shared file or a DB entry. An application can not solve this problem, 
but it might try to help to identify it. Some efforts are necessary from 
user side. Timestamp should contain list of timezones of other 
participants and cached local time. In such case an application may warn 
users that local time values become inconsistent due to DST transitions 
or due to update of time zone database. Unsure to what degree it should 
be implemented in Org.

So
- It is participants fault if a meeting is not associated with 
particular timezone
- Having a fair time handling library, it does not matter what time zone 
is used to schedule the meeting.