From: Tim Cross <theophilusx@gmail.com>
To: Ihor Radchenko <yantar92@posteo.net>
Cc: Jean Louis <bugs@gnu.support>, Daryl Manning <daryl@wakatara.com>,
emacs-orgmode@gnu.org
Subject: Re: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda
Date: Thu, 19 Jan 2023 08:31:07 +1100 [thread overview]
Message-ID: <63c8708e.170a0220.ba554.60ef@mx.google.com> (raw)
In-Reply-To: <87a62g8a2m.fsf@localhost>
Ihor Radchenko <yantar92@posteo.net> writes:
> Jean Louis <bugs@gnu.support> writes:
>
>> ...
>> Should be part of C library to observe those things.
>
> Sure. My previous proposals are all relying on `encode-time' which uses
> time.h from system libraries and utilizing TZDB that is taking care
> about all this insanity.
>
> We, however, might need to be careful about applying date increments. In
> `org-read-date' and `org-timestamp-change', which are implemented in
> Elisp without considering these complexities. (maybe also other
> functions; these are just the ones I can think about)
>
> What should we do when:
>
> 1. It is close to DST transition 2:59 -> 2:00 -> 2:01 -> ... -> 2:59 -> 3:00
> and the users asks to create a timestamp +1h from now
> or, worse, a timestamp +1h from now in a different time zone
>
> 2. A user asks +1w date shift and the time zone has a 1-day jump during DST?
> what about +7d? +1d?
>
> 3. What will be +1d 2:30am timestamp refer to when there DST transition
> as in (1)?
Yep, these are exactly the sorts of issues I was worried about wrt
adding time zone support. Challenge here is I'm not sure there is one
right answer. It will depend on individual use cases. I guess the best
we can do is select what seems to be the most 'sane' approach and
document th elimitations (and possibly how to work around them). The key
is likely to avoid user surprise. Limitations are often better accepted
when flagged up front and when 'discovered' later.
Initially, my thoughts on the 3 above are "I have no clue what the sane
default is" - all options seem to have equal pros and cons. Guess the
best we can do is go with the simplest solution and 'suck it and see".
next prev parent reply other threads:[~2023-01-18 22:20 UTC|newest]
Thread overview: 330+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-13 8:56 [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda Daryl Manning
2023-01-13 12:51 ` Tim Cross
2023-01-14 6:27 ` Daryl Manning
2023-01-14 12:46 ` Jean Louis
2023-01-14 11:18 ` Ihor Radchenko
2023-01-14 11:26 ` Daryl Manning
2023-01-14 11:42 ` Ihor Radchenko
2023-01-15 5:11 ` Max Nikulin
2023-01-15 13:41 ` Ihor Radchenko
2023-01-16 16:43 ` Max Nikulin
2023-01-16 18:37 ` Ihor Radchenko
2023-01-17 17:40 ` Max Nikulin
2023-01-18 9:59 ` Ihor Radchenko
2023-01-18 16:25 ` Jean Louis
2023-01-18 16:24 ` [SOLUTION] " Jean Louis
2023-01-20 10:57 ` Ihor Radchenko
2023-01-20 11:29 ` Daryl Manning
2023-01-20 11:36 ` Ihor Radchenko
2023-01-20 15:10 ` Daryl Manning
2023-01-20 11:39 ` Fraga, Eric
2023-01-20 11:48 ` Ihor Radchenko
2023-01-21 12:55 ` Jean Louis
2023-01-21 13:41 ` Ihor Radchenko
2023-01-21 9:21 ` Ihor Radchenko
2023-01-21 10:14 ` Max Nikulin
2023-01-22 11:49 ` Ihor Radchenko
2023-01-20 22:51 ` Tim Cross
2023-01-14 13:03 ` Tim Cross
2023-01-14 13:22 ` Ihor Radchenko
2023-01-15 19:10 ` Jean Louis
2023-01-16 11:21 ` Ihor Radchenko
2023-01-16 11:30 ` Daryl Manning
2023-01-16 11:39 ` Ihor Radchenko
2023-01-16 15:43 ` Daryl Manning
2023-01-16 19:07 ` Ihor Radchenko
2023-01-16 19:22 ` Robert Horn
2023-01-16 19:41 ` Ihor Radchenko
2023-01-16 20:47 ` Robert Horn
2023-01-16 21:02 ` Tom Gillespie
2023-01-16 21:48 ` Robert Horn
2023-01-17 8:53 ` Ihor Radchenko
2023-01-17 3:55 ` Daryl Manning
2023-01-17 8:22 ` Tim Cross
2023-01-17 9:15 ` Ihor Radchenko
2023-01-17 9:45 ` Tim Cross
2023-01-18 9:15 ` Ihor Radchenko
2023-01-18 11:43 ` Tim Cross
2023-01-18 12:02 ` Ihor Radchenko
2023-01-18 21:16 ` Tim Cross
2023-01-19 5:29 ` Jean Louis
2023-01-19 6:25 ` Thomas S. Dye
2023-01-19 14:17 ` Jean Louis
2023-01-19 15:55 ` Thomas S. Dye
2023-01-21 13:10 ` Jean Louis
2023-01-21 16:23 ` Thomas S. Dye
2023-01-21 13:50 ` Jean Louis
2023-01-21 14:31 ` Max Nikulin
2023-01-21 16:55 ` Thomas S. Dye
2023-01-19 7:23 ` Tim Cross
2023-01-19 14:32 ` Jean Louis
2023-01-19 20:09 ` Tim Cross
2023-01-19 23:02 ` Thomas S. Dye
2023-01-19 23:51 ` Tim Cross
2023-01-20 0:24 ` Thomas S. Dye
2023-01-20 3:46 ` Tim Cross
2023-01-20 6:14 ` Thomas S. Dye
2023-01-27 6:06 ` Sterling Hooten
2023-01-27 6:09 ` Daryl Manning
2023-01-27 9:54 ` Jean Louis
2023-01-27 21:04 ` Tim Cross
2023-01-29 4:09 ` Jean Louis
2023-01-29 6:21 ` Thomas S. Dye
2023-01-29 6:46 ` Daryl Manning
2023-01-29 14:10 ` Ihor Radchenko
2023-01-30 19:37 ` Jean Louis
2023-01-31 0:53 ` Thomas S. Dye
[not found] ` <0597910b-9b01-3c0c-5d06-da171e0de4cd@gmx.at>
2023-01-31 6:08 ` Jean Louis
2023-01-29 6:31 ` Max Nikulin
2023-01-30 20:36 ` Jean Louis
2023-01-30 20:38 ` Jean Louis
2023-01-29 20:26 ` Tim Cross
2023-01-30 20:55 ` Jean Louis
2023-01-30 21:54 ` Tim Cross
2023-01-31 7:04 ` Jean Louis
2023-01-31 8:14 ` Max Nikulin
2023-01-31 13:02 ` Jean Louis
2023-01-27 11:09 ` Ihor Radchenko
2023-01-27 12:49 ` Sterling Hooten
2023-01-27 13:00 ` Ihor Radchenko
2023-01-27 15:03 ` Jean Louis
2023-01-30 13:08 ` Ihor Radchenko
2023-01-27 20:58 ` Tim Cross
2023-01-30 11:25 ` Greg Minshall
2023-01-31 11:48 ` [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda) Ihor Radchenko
2023-01-31 12:19 ` Daryl Manning
2023-01-31 12:41 ` Ihor Radchenko
[not found] ` <CAL9aZksf8AGF=dXg0KAtLPyu1ATt1fLpvdsjN6GMCuK2KRQ56w@mail.gmail.com>
2023-01-31 13:33 ` Ihor Radchenko
2023-01-31 13:22 ` Jean Louis
2023-01-31 13:46 ` Ihor Radchenko
2023-01-31 19:59 ` Jean Louis
2023-02-01 12:42 ` Ihor Radchenko
2023-02-01 15:28 ` Jean Louis
2023-02-01 16:30 ` Ihor Radchenko
2023-01-31 20:12 ` Jean Louis
2023-02-01 5:46 ` tomas
2023-02-01 7:29 ` Jean Louis
2023-02-01 7:52 ` Tim Cross
2023-02-01 8:32 ` Jean Louis
2023-02-01 8:46 ` Ihor Radchenko
2023-02-01 9:38 ` Tim Cross
2023-02-01 10:15 ` Ihor Radchenko
2023-02-01 14:53 ` Jean Louis
2023-02-01 16:36 ` Ihor Radchenko
2023-02-01 10:46 ` Max Nikulin
2023-02-01 14:43 ` Jean Louis
2023-02-01 16:45 ` Ihor Radchenko
2023-02-02 3:05 ` Max Nikulin
2023-02-02 8:59 ` Ihor Radchenko
2023-02-01 9:40 ` [POLL] Proposed syntax for timestamps with time zone info Stefan Nobis
2023-02-01 9:45 ` Ihor Radchenko
2023-02-01 14:38 ` [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda) Jean Louis
2023-02-01 16:50 ` Ihor Radchenko
2023-02-03 15:48 ` [POLL] Proposed syntax for timestamps with time zone info Stefan Nobis
2023-02-04 5:07 ` Jean Louis
2023-02-01 9:06 ` Stefan Nobis
2023-02-01 9:20 ` tomas
2023-02-01 9:48 ` Stefan Nobis
2023-10-29 1:04 ` Jean Louis
2023-02-06 15:34 ` Marcin Borkowski
2023-02-06 17:03 ` tomas
2023-02-07 21:08 ` Jean Louis
2023-10-29 1:02 ` Jean Louis
2023-02-01 7:00 ` [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda) Thomas S. Dye
2023-02-01 7:41 ` Jean Louis
2023-01-31 17:56 ` [POLL] Proposed syntax for timestamps with time zone info Fraga, Eric
2023-01-31 18:13 ` Ihor Radchenko
2023-01-31 18:22 ` Fraga, Eric
2023-01-31 18:56 ` [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda) Greg Minshall
2023-02-01 12:48 ` Ihor Radchenko
2023-02-01 12:52 ` tomas
2023-02-02 4:49 ` Greg Minshall
2023-01-31 20:41 ` Tim Cross
2023-01-31 23:50 ` Samuel Wales
2023-02-01 13:01 ` Ihor Radchenko
2023-02-04 22:33 ` Samuel Wales
2023-02-04 22:49 ` Samuel Wales
2023-02-05 10:38 ` Ihor Radchenko
2023-02-01 11:56 ` Christian Moe
2023-02-01 12:20 ` Ihor Radchenko
[not found] ` <87o7qdsf7h.fsf@christianmoe.com>
2023-02-01 13:26 ` POSIX TS spec reverses the meaning of TZ offset compared to ISO (was: [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda)) Ihor Radchenko
2023-02-01 13:51 ` tomas
2023-02-01 21:57 ` POSIX TS spec reverses the meaning of TZ offset compared to ISO (was: [POLL] Proposed syntax for timestamps with time zone info Heinz Tuechler
2023-02-01 22:50 ` Samuel Wales
2023-02-02 9:01 ` Ihor Radchenko
2023-02-02 3:22 ` Max Nikulin
2023-02-02 7:45 ` POSIX TS spec reverses the meaning of TZ offset compared to ISO Heinz Tuechler
2023-02-02 8:33 ` tomas
2023-02-02 9:37 ` Heinz Tuechler
2023-02-04 15:44 ` Max Nikulin
2023-02-02 5:35 ` POSIX TS spec reverses the meaning of TZ offset compared to ISO (was: [POLL] Proposed syntax for timestamps with time zone info tomas
2023-02-02 8:56 ` Ihor Radchenko
2023-02-01 15:16 ` POSIX TS spec reverses the meaning of TZ offset compared to ISO (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda) Max Nikulin
2023-02-02 8:34 ` Ihor Radchenko
2023-02-02 13:59 ` Max Nikulin
2023-02-02 14:06 ` Ihor Radchenko
2023-02-01 15:41 ` [POLL] Proposed syntax for timestamps with time zone info " Jean Louis
2023-02-02 8:38 ` Ihor Radchenko
2023-02-03 11:31 ` Jean Louis
2023-02-04 10:58 ` Ihor Radchenko
2023-02-04 19:32 ` Jean Louis
2023-02-05 9:14 ` Ihor Radchenko
2023-02-02 3:46 ` Timothy
2023-02-02 9:12 ` Ihor Radchenko
2023-02-02 9:12 ` Timothy
2023-02-02 9:20 ` Ihor Radchenko
2023-02-02 9:27 ` Timothy
2023-02-02 9:38 ` [POLL] Proposed syntax for timestamps with time zone info Stefan Nobis
2023-01-30 12:30 ` [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda Ihor Radchenko
2023-01-30 15:30 ` Greg Minshall
2023-01-30 15:38 ` Ihor Radchenko
2023-01-30 15:48 ` Greg Minshall
2023-01-20 4:03 ` Max Nikulin
2023-01-20 5:39 ` Tim Cross
2023-01-20 7:28 ` Max Nikulin
2023-01-20 8:11 ` Tim Cross
2023-01-20 15:29 ` Max Nikulin
2023-01-20 22:56 ` Tim Cross
2023-01-20 9:35 ` Fraga, Eric
2023-01-20 10:48 ` Ihor Radchenko
2023-01-20 6:46 ` Thomas S. Dye
2023-01-20 7:34 ` Max Nikulin
2023-01-20 8:17 ` Tim Cross
2023-01-20 12:17 ` Max Nikulin
2023-01-20 16:09 ` Thomas S. Dye
2023-01-20 16:56 ` Max Nikulin
2023-01-20 20:37 ` Thomas S. Dye
2023-01-21 0:14 ` Tim Cross
2023-01-21 0:37 ` Thomas S. Dye
2023-01-21 5:53 ` Max Nikulin
2023-01-21 15:55 ` Thomas S. Dye
2023-01-22 12:14 ` Max Nikulin
2023-01-22 13:35 ` Thomas S. Dye
2023-01-22 14:09 ` Max Nikulin
2023-01-20 23:38 ` Tim Cross
2023-01-21 6:21 ` Max Nikulin
2023-01-21 21:29 ` Tim Cross
2023-01-22 5:50 ` UTC or not UTC for timestamps in the past ([FEATURE REQUEST] Timezone support in org-mode) Max Nikulin
2023-01-22 6:17 ` Thomas S. Dye
2023-01-22 8:35 ` Max Nikulin
2023-01-22 16:54 ` Thomas S. Dye
2023-01-23 6:28 ` Jean Louis
2023-01-23 16:04 ` Thomas S. Dye
2023-01-24 2:34 ` Max Nikulin
2023-01-24 2:44 ` Thomas S. Dye
2023-01-24 4:48 ` Max Nikulin
2023-01-24 19:18 ` Jean Louis
2023-01-24 9:34 ` Ihor Radchenko
2023-01-24 16:41 ` Thomas S. Dye
2023-01-26 15:37 ` Max Nikulin
2023-01-26 16:31 ` Thomas S. Dye
2023-01-27 21:21 ` Tim Cross
2023-01-22 7:48 ` Tim Cross
2023-01-24 17:09 ` Max Nikulin
2023-01-24 19:20 ` Jean Louis
2023-01-24 20:50 ` Tim Cross
2023-01-19 10:35 ` [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda Ihor Radchenko
2023-01-19 17:57 ` Alexander Adolf
2023-01-21 13:51 ` Jean Louis
2023-01-18 17:09 ` Max Nikulin
2023-01-17 8:45 ` Ihor Radchenko
2023-01-19 16:56 ` Robert Horn
2023-01-19 17:44 ` Alexander Adolf
2023-01-19 17:48 ` Alexander Adolf
2023-01-17 15:37 ` Jean Louis
2023-01-18 9:29 ` Ihor Radchenko
2023-01-18 16:11 ` Jean Louis
2023-01-18 21:31 ` Tim Cross [this message]
2023-01-19 10:40 ` Ihor Radchenko
2023-01-17 17:28 ` Max Nikulin
2023-01-17 19:49 ` Ihor Radchenko
2023-01-18 16:21 ` Jean Louis
2023-01-18 16:20 ` Jean Louis
2023-01-20 16:27 ` Max Nikulin
2023-01-19 17:33 ` Alexander Adolf
2023-01-16 20:25 ` Tim Cross
2023-01-17 9:07 ` Ihor Radchenko
2023-01-17 15:24 ` Jean Louis
2023-01-18 9:34 ` Ihor Radchenko
2023-01-18 16:07 ` Jean Louis
2023-01-19 10:43 ` Ihor Radchenko
2023-01-19 14:37 ` Jean Louis
2023-01-15 20:43 ` Jean Louis
2023-01-16 11:25 ` Ihor Radchenko
2023-01-17 15:19 ` Jean Louis
2023-01-18 9:38 ` Ihor Radchenko
2023-01-16 5:01 ` Tom Gillespie
2023-01-16 12:31 ` Ihor Radchenko
2023-01-16 20:32 ` Tim Cross
2023-01-16 20:51 ` Tom Gillespie
2023-01-17 9:12 ` [FR] Allow BC years in timestamps (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda) Ihor Radchenko
2023-01-13 19:06 ` [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda Jean Louis
2023-01-14 7:12 ` Max Nikulin
2023-01-14 9:32 ` Tim Cross
2023-01-14 11:08 ` Russell Adams
2023-01-14 11:35 ` Ihor Radchenko
2023-01-14 12:00 ` Russell Adams
2023-01-14 12:16 ` [FR] Allow end date and max repeat count for timestamps with repeaters (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda) Ihor Radchenko
2023-01-15 1:09 ` Samuel Wales
2023-01-15 13:45 ` Ihor Radchenko
2023-01-15 23:49 ` Samuel Wales
2023-01-15 23:53 ` Samuel Wales
2023-01-16 13:01 ` Ihor Radchenko
2023-01-14 12:19 ` [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda Ihor Radchenko
2023-01-14 12:21 ` Russell Adams
2023-01-14 12:31 ` Ihor Radchenko
2023-01-14 11:30 ` Ihor Radchenko
2023-01-14 14:09 ` Tim Cross
2023-01-14 14:38 ` Ihor Radchenko
2023-01-14 14:48 ` tomas
2023-01-14 15:05 ` Ihor Radchenko
2023-01-14 16:50 ` tomas
2023-01-14 17:06 ` Ihor Radchenko
2023-01-14 17:13 ` tomas
2023-01-15 19:54 ` Jean Louis
2023-01-14 21:52 ` Tim Cross
2023-01-15 13:52 ` Ihor Radchenko
2023-01-20 14:34 ` Alexander Adolf
2023-01-15 20:03 ` Jean Louis
2023-01-15 19:52 ` Jean Louis
2023-01-16 13:11 ` Ihor Radchenko
2023-01-14 20:56 ` Tim Cross
2023-01-15 20:24 ` Jean Louis
2023-01-15 4:37 ` Max Nikulin
2023-01-15 5:03 ` Max Nikulin
2023-01-15 20:28 ` Jean Louis
2023-01-16 13:17 ` Ihor Radchenko
2023-01-14 11:55 ` Max Nikulin
2023-01-14 13:50 ` Tim Cross
2023-01-14 16:50 ` Max Nikulin
2023-01-14 20:30 ` Tim Cross
2023-01-15 4:00 ` Max Nikulin
2023-01-15 7:53 ` Tim Cross
2023-01-15 19:26 ` Jean Louis
2023-01-16 13:20 ` Ihor Radchenko
2023-01-15 14:00 ` Ihor Radchenko
2023-01-14 13:08 ` Jean Louis
2023-01-14 16:58 ` Max Nikulin
2023-01-14 19:43 ` Tim Cross
2023-01-15 6:37 ` tomas
2023-01-15 14:07 ` Ihor Radchenko
2023-01-15 20:43 ` Tim Cross
2023-01-16 5:20 ` Tom Gillespie
2023-01-16 13:29 ` Ihor Radchenko
2023-01-16 17:30 ` Tom Gillespie
2023-01-16 17:53 ` Ihor Radchenko
2023-01-16 13:27 ` Ihor Radchenko
2023-01-15 19:14 ` Jean Louis
2023-01-16 4:20 ` Max Nikulin
2023-01-15 19:12 ` Jean Louis
2023-01-14 5:14 ` Samuel Wales
2023-01-14 5:51 ` Tom Gillespie
2023-01-14 6:40 ` tomas
2023-01-26 15:24 ` Org mode timestamps on the Moon ;] (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda) Ihor Radchenko
2023-01-26 16:08 ` Org mode timestamps on the Moon ;] Fraga, Eric
2023-01-26 16:28 ` Thomas S. Dye
2023-01-26 23:40 ` Org mode timestamps on the Moon ;] (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda) Tom Gillespie
2023-01-30 10:13 ` Org mode timestamps on the Moon ; ] " Greg Minshall
2023-01-30 13:05 ` Org mode timestamps on the Moon ;] " Ihor Radchenko
-- strict thread matches above, loose matches on Subject: below --
2023-01-15 19:16 [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda Thomas S. Dye
2023-01-28 6:26 Max Nikulin
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