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Message-ID: <Pine.BSM.4.64L.2405132116570.17030@herc.mirbsd.org>
Date: Mon, 13 May 2024 21:18:21 +0000 (UTC)
From: Thorsten Glaser <tg@...bsd.de>
To: musl@...ts.openwall.com
Subject: Re: strptime(s, "%Y-%j", &tm) does not update month and day
Rich Felker dixit:
>if you assume POSIX-compatible time_t, just adding 86400*tm_yday to
>the time_t.
AIUI, POSIX (Issue 8) suggests to add 86400*tm_yday to tm_sec and
using mktime to normalise it.
If you don’t start at 00:00:00 UTC, it should even work for systems
that honour leap seconds (say start at 1st January, 12:00:00 UTC;
the result may than be not at 12:00:00, but the day should be right).
bye,
//mirabilos
--
“It is inappropriate to require that a time represented as
seconds since the Epoch precisely represent the number of
seconds between the referenced time and the Epoch.”
-- IEEE Std 1003.1b-1993 (POSIX) Section B.2.2.2
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