From: Ulrich Mueller <ulm@gentoo.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 72570@debbugs.gnu.org, Paul Eggert <eggert@cs.ucla.edu>
Subject: bug#72570: 31.0.50; Regression in date-to-time
Date: Tue, 13 Aug 2024 17:09:14 +0200 [thread overview]
Message-ID: <ucymc7945@gentoo.org> (raw)
In-Reply-To: <86ikw4hdw2.fsf@gnu.org> (Eli Zaretskii's message of "Tue, 13 Aug 2024 14:15:57 +0300")
>>>>> On Tue, 13 Aug 2024, Eli Zaretskii wrote:
> The change which affected behavior that triggered this discussion was
> done because evidently timezone-time-zone-from-absolute was deemed to
> be too slow, and therefore the authors of the change wanted to avoid
> it. I'm okay with making the result of that change the de-facto
> default, but then (a) we should document this change in NEWS including
> the (trivial) way of getting back old behavior,
But what is the old behaviour? The one that is documented, or the actual
behaviour of the code?
(format-time-string "%F %T" (date-to-time "2024-08-13 00:00:00"))
"2024-08-13 00:00:00"
(format-time-string "%F %T" (date-to-time "2024-8-13 00:00:00"))
"2024-08-13 02:00:00"
In the first case, parse-time-string (inside the first condition-case)
succeeds and it uses local time. In the second case with a slightly
malformed date, it takes the detour via timezone-make-date-arpa-standard
and uses UTC.
Also:
(format-time-string "%F %T" (date-to-time "2024/08/13 00:00:00"))
"2024-01-08 00:00:00"
The GIGO principle at its finest. :) However, I'd much prefer if the
function would check validity of the input and error out, rather than
returning a nonsensical result. But maybe that's another issue and
outside the scope of this bug report.
> and (b) make sure that
> the new behavior happens even if the body of this condition-case in
> date-to-time:
> (condition-case err
> (let ((parsed (parse-time-string date)))
> (when (decoded-time-year parsed)
> (decoded-time-set-defaults parsed))
> (encode-time parsed))
> does not signal an error.
next prev parent reply other threads:[~2024-08-13 15:09 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-11 8:57 bug#72570: 31.0.50; Regression in date-to-time Ulrich Mueller
2024-08-12 7:27 ` Ulrich Mueller
2024-08-12 8:18 ` Ulrich Mueller
2024-08-12 11:42 ` Eli Zaretskii
2024-08-12 12:51 ` Ulrich Mueller
2024-08-12 13:26 ` Eli Zaretskii
2024-08-12 13:48 ` Ulrich Mueller
2024-08-12 14:30 ` Eli Zaretskii
2024-08-12 22:03 ` Paul Eggert
2024-08-13 5:55 ` Ulrich Mueller
2024-08-13 19:39 ` Paul Eggert
2024-08-13 21:11 ` Ulrich Mueller
2024-08-13 21:19 ` Paul Eggert
2024-08-14 8:12 ` Ulrich Mueller
2024-08-14 14:09 ` Ulrich Mueller
2024-08-15 3:27 ` Paul Eggert
2024-08-15 4:35 ` Ulrich Mueller
2024-08-15 6:26 ` Paul Eggert
2024-08-15 6:45 ` Eli Zaretskii
2024-08-15 7:18 ` Ulrich Mueller
2024-08-15 7:22 ` Eli Zaretskii
2024-08-13 11:15 ` Eli Zaretskii
2024-08-13 15:09 ` Ulrich Mueller [this message]
2024-08-13 15:36 ` Eli Zaretskii
2024-08-13 19:59 ` Paul Eggert
2024-08-14 8:37 ` Eli Zaretskii
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