bug#52934: format-time-string year error

[Eli Zaretskii <eliz@gnu.org>]

> 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.