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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: Re: Emacs current-time-string core dump on 64-bit hosts
Date: Tue, 21 Mar 2006 14:25:47 -0500
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    In the meantime our best bet by far is to tell people this simple rule:

      Don't use ctime.

    Such a rule is much easier to remember than this one:

      Don't use ctime unless you have sufficient control over its argument
      time stamps to know that they won't generate more than 26 bytes when
      one naively applies the algorithm on page 341 of the 1999 edition of
      the C Standard.

I'd prefer just to fix ctime, using the method I told you.