From: Tim Cross <theophilusx@gmail.com>
To: Max Nikulin <manikulin@gmail.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda
Date: Sun, 15 Jan 2023 00:50:04 +1100 [thread overview]
Message-ID: <63c2b760.170a0220.56455.a114@mx.google.com> (raw)
In-Reply-To: <tpu573$laj$1@ciao.gmane.io>
Max Nikulin <manikulin@gmail.com> writes:
> On 14/01/2023 16:32, Tim Cross wrote:
>> If org was to add TZ capabilities to timestamps, the underlying format
>> would have to be UTC.
> ...
>> can change based on various criteria, including political whims
>> (e.g. Australia eastern DST transition date was changed in 2000 because
>> Sydney hosted the Olympics that year).
>
> Due to this particular reason storage format for significant fraction of future timestamps
> (but not always) must not be in UTC
>
> 2024-01-14 Sun 21:14:58 ACS (+0930, Australia/Darwin)
>
> is not the same as
>
> 2024-01-14 Sun 11:45:58 UTC (+0000, Z)
>
> despite currently it is.
>
I"m sorry, but I don't follow. The UTC time is the only time whihc is
not affected by daylight savings transitions, so is the only stable
metric. All the others are relative to that time but can change based on
things like changes in DST transition dates/times. When DST transitions
occur, time is lost/gained wrt the local time, but real time and UTC
time do not change. So when DST starts here at 2am on the llth it is 5pm
on the 10th UTC. At 2am locally, we jump to 3am, losing an hour, but the
UTC time is still 5pm. The meeting I had scheduled for 10am with friends
form the US was at 0:00 UTC. It is now at 11am local time, but still at
0:00 UTC, however, I will likely fall asleep in it because instead of my
normal 7 hours sleep, I only got six despite going to be and getting up
at the same time.
> Depending on use case the same particular fields of timestamp may be authoritative or
> derived for user convenience from other data.
>
> UNIX timestamps in seconds in UTC timezone almost unavoidable will be used underneath, but
> operations like "start of next day" require non-trivial computations to find if time zone
> offset changes in between.
Yes, but if the underlying representation is UTC, then all you have to
do is apply local TZ data to get the local time. THis is how postgres
works. You just hav eto ensure the TZ data you get is the TZ data for
that date in that locale.
next prev parent reply other threads:[~2023-01-14 14:09 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
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 [this message]
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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