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Re: [POLL] Proposed syntax for timestamps with time zone info (was: [FEA
From: |
Ihor Radchenko |
Subject: |
Re: [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda) |
Date: |
Sat, 04 Feb 2023 10:58:10 +0000 |
Jean Louis <bugs@gnu.support> writes:
>> >> [2022-11-12 14:00 @UTC+2]
>> >> [2022-11-12 14:00 @UTC-2:30]
>> >>
>> >> are also fine within the proposed format.
>> >
>> > The above format is unclear to me. I look at timestamps every day, too
>> > many, often change them.
>> >
>> > I cannot understand what you mean.
>>
>> See "std offset" format for TZ environment variable.
>> https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
>
> I understand that information on hyperlink.
>
> I do not understand how it is related to "UTC", a with "UTC" people do
> not put UTC offset.
Well. "UTC" there is rather arbitrary, but _some_ abbreviation is
required as per TZ spec. Could also be [2022-11-12 14:00 @BLAHBLAH+2]
I used "UTC+2" because it is how offsets are often represented.
For example, https://time.is/London is displaying the following:
Time in London, United Kingdom now
...
Time zone
- Currently Greenwich Mean Time (GMT), UTC +0
- Daylight saving time (British Summer Time (BST), UTC +1) starts March 26,
2023
Note UTC +0 and UTC +1.
I've seen such format in multiple time websites.
On the other hand, TZ POSIX is reverse from what is commonly meant when
displaying UTC +1.
> It is either UTC as time zone and offset can be considered only ZERO,
> like +0, or it is NOT UTC as time zone, and there is offset to
> understand what was really the UTC. This latter is also explained in
> that hyperlink.
> So what do you really mean with such time stamp?
>
You are right. From the point of view of TZ POSIX spec, UTC+2 is not UTC
time zone and not a known time zone. Rather manual nautical time zone
with arbitrary name and fixed UTC offset (+2).
> I think it is incorrect time stamp. If you specify UTC, you do not
> specify UTC offset.
It is a correct TZ value 🤷
--
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>
- Re: POSIX TS spec reverses the meaning of TZ offset compared to ISO, (continued)
- Re: POSIX TS spec reverses the meaning of TZ offset compared to ISO, Max Nikulin, 2023/02/04
- Re: 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
- Re: POSIX TS spec reverses the meaning of TZ offset compared to ISO (was: [POLL] Proposed syntax for timestamps with time zone info, Ihor Radchenko, 2023/02/02
- Re: 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, 2023/02/01
- Re: POSIX TS spec reverses the meaning of TZ offset compared to ISO (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda), Ihor Radchenko, 2023/02/02
- Re: 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
- Re: POSIX TS spec reverses the meaning of TZ offset compared to ISO (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda), Ihor Radchenko, 2023/02/02
- Re: [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
- Re: [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda), Ihor Radchenko, 2023/02/02
- Re: [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda), Jean Louis, 2023/02/03
- Re: [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda),
Ihor Radchenko <=
- Re: [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda), Jean Louis, 2023/02/05
- Re: [POLL] Proposed syntax for timestamps with time zone info (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda), Ihor Radchenko, 2023/02/05
Re: [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
Re: [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
Re: [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