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From: Ihor Radchenko <yantar92@posteo.net>
To: Max Nikulin <manikulin@gmail.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: Observation of hysteresis in a GNU libc time conversion function
Date: Wed, 18 Jan 2023 09:54:20 +0000	[thread overview]
Message-ID: <871qns88xf.fsf@localhost> (raw)
In-Reply-To: <tq6lg6$9m2$1@ciao.gmane.io>

Max Nikulin <manikulin@gmail.com> writes:

> 	   (dt '(-90 -60 -31 -30 -29 -15 0 15 29 30 31 60 90))

This is problematic. You are putting MINUTES out of normal range.
Looking at
https://codecogs.com/library/computing/c/time.h/ctime.php?alias=mktime,
out-of-range minutes are not documented.

Also, see
https://stackoverflow.com/questions/20104531/weird-mktime-logic-with-negative-seconds

Using out-of-range time fields is not advised.

-- 
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>


  reply	other threads:[~2023-01-18  9:54 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-17 17:22 Observation of hysteresis in a GNU libc time conversion function Max Nikulin
2023-01-18  9:54 ` Ihor Radchenko [this message]
2023-01-18 16:32   ` Max Nikulin
2023-01-18 16:38     ` Max Nikulin
2023-01-19 10:31     ` Ihor Radchenko

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