* bug#52934: format-time-string year error
@ 2022-01-01 20:11 david
2022-01-01 20:16 ` bug#52934: [External] : " Drew Adams
2022-01-01 20:25 ` Eli Zaretskii
0 siblings, 2 replies; 6+ messages in thread
From: david @ 2022-01-01 20:11 UTC (permalink / raw)
To: 52934
;; I ran this in the *scratch* buffer at lunch time in Denver.
;; The year is not right.
(defun doit ()
(format "%s\n%s\n%s"
(current-time)
(format-time-string "%d %b")
(format-time-string "%R %G")))
(doit)
"(25040 45621 647344 602000)
01 Jan
12:57 2021"
^ permalink raw reply [flat|nested] 6+ messages in thread* bug#52934: [External] : bug#52934: format-time-string year error 2022-01-01 20:11 bug#52934: format-time-string year error david @ 2022-01-01 20:16 ` Drew Adams 2022-01-01 20:25 ` Eli Zaretskii 1 sibling, 0 replies; 6+ messages in thread From: Drew Adams @ 2022-01-01 20:16 UTC (permalink / raw) To: david@ngdr.net, 52934@debbugs.gnu.org Confirmed, for this build at least: In GNU Emacs 27.2 (build 1, x86_64-w64-mingw32) of 2021-03-26 built on CIRROCUMULUS Repository revision: deef5efafb70f4b171265b896505b92b6eef24e6 Repository branch: HEAD Windowing system distributor 'Microsoft Corp.', version 10.0.19042 System Description: Microsoft Windows 10 Pro (v10.0.2009.19042.1348) ^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#52934: format-time-string year error 2022-01-01 20:11 bug#52934: format-time-string year error david 2022-01-01 20:16 ` bug#52934: [External] : " Drew Adams @ 2022-01-01 20:25 ` Eli Zaretskii 2022-01-01 22:21 ` Andreas Schwab 1 sibling, 1 reply; 6+ messages in thread From: Eli Zaretskii @ 2022-01-01 20:25 UTC (permalink / raw) To: david; +Cc: 52934 > Date: Sat, 01 Jan 2022 13:11:56 -0700 > From: <david@ngdr.net> > > ;; I ran this in the *scratch* buffer at lunch time in Denver. > ;; The year is not right. > (defun doit () > (format "%s\n%s\n%s" > (current-time) > (format-time-string "%d %b") > (format-time-string "%R %G"))) > (doit) > "(25040 45621 647344 602000) > 01 Jan > 12:57 2021" The doc string of format-time-string says: %G is the year corresponding to the ISO week Isn't it true that the ISO week is still in 2021 today? ^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#52934: format-time-string year error 2022-01-01 20:25 ` Eli Zaretskii @ 2022-01-01 22:21 ` Andreas Schwab 2022-01-01 23:01 ` david 0 siblings, 1 reply; 6+ messages in thread From: Andreas Schwab @ 2022-01-01 22:21 UTC (permalink / raw) To: Eli Zaretskii; +Cc: 52934, david On Jan 01 2022, Eli Zaretskii wrote: >> Date: Sat, 01 Jan 2022 13:11:56 -0700 >> From: <david@ngdr.net> >> >> ;; I ran this in the *scratch* buffer at lunch time in Denver. >> ;; The year is not right. >> (defun doit () >> (format "%s\n%s\n%s" >> (current-time) >> (format-time-string "%d %b") >> (format-time-string "%R %G"))) >> (doit) >> "(25040 45621 647344 602000) >> 01 Jan >> 12:57 2021" > > The doc string of format-time-string says: > > %G is the year corresponding to the ISO week > > Isn't it true that the ISO week is still in 2021 today? Week 52 of 2021 started on 2021-12-27, and ends on 2022-01-02. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different." ^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#52934: format-time-string year error 2022-01-01 22:21 ` Andreas Schwab @ 2022-01-01 23:01 ` david 2022-01-02 7:32 ` Eli Zaretskii 0 siblings, 1 reply; 6+ messages in thread From: david @ 2022-01-01 23:01 UTC (permalink / raw) To: Andreas Schwab; +Cc: 52934 Now I have read about ISO 8601 in Wikipedia and, of course, your replies are correct; now I know that we are in week 52 of 2021. However, someone writing Emacs code to produce a timestamp for, e.g., .html code, does not see the need to study an ISO specification to avoid a tripwire that is not even obvious - the problem only occurs, if it occurs, in a few days of the year. Otherwise there is no reason to suspect that personal code is faulty: it will perform correctly, including under test, for about 360 days of the year. I should like to suggest a note in the Emacs Info documentation that warns the reader that ISO weeks do not map nicely into the calendar that the reader lives by. That would be helpful. I am not suggesting that the Emacs documentation should describe ISO 8601, only that it warns of the potential problems, and, ideally, gives a reference to a description of the standard. dajo ^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#52934: format-time-string year error 2022-01-01 23:01 ` david @ 2022-01-02 7:32 ` Eli Zaretskii 0 siblings, 0 replies; 6+ messages in thread From: Eli Zaretskii @ 2022-01-02 7:32 UTC (permalink / raw) To: david; +Cc: 52934-done, schwab > Date: Sat, 01 Jan 2022 16:01:21 -0700 > From: <david@ngdr.net> > Cc: Eli Zaretskii <eliz@gnu.org>, <52934@debbugs.gnu.org> > > Now I have read about ISO 8601 in Wikipedia and, of course, your replies > are correct; now I know that we are in week 52 of 2021. > > However, someone writing Emacs code to produce a timestamp for, e.g., > .html code, does not see the need to study an ISO specification to avoid a > tripwire that is not even obvious - the problem only occurs, if it occurs, > in a few days of the year. Otherwise there is no reason to suspect that > personal code is faulty: it will perform correctly, including under test, > for about 360 days of the year. > > I should like to suggest a note in the Emacs Info documentation that warns > the reader that ISO weeks do not map nicely into the calendar that the > reader lives by. That would be helpful. I am not suggesting that the > Emacs documentation should describe ISO 8601, only that it warns of the > potential problems, and, ideally, gives a reference to a description of the > standard. I enhanced the documentation, thanks. Pointing to the ISO standard would not be useful, since it is not freely available, so I said something about the rules instead. I'm therefore closing this bug. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2022-01-02 7:32 UTC | newest] Thread overview: 6+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2022-01-01 20:11 bug#52934: format-time-string year error david 2022-01-01 20:16 ` bug#52934: [External] : " Drew Adams 2022-01-01 20:25 ` Eli Zaretskii 2022-01-01 22:21 ` Andreas Schwab 2022-01-01 23:01 ` david 2022-01-02 7:32 ` Eli Zaretskii
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