From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Edmondson <dme@dme.org>
Subject: Re: Agenda Bulk Scatter bug
Date: Fri, 10 Jun 2011 10:05:09 +0100
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* carsten.dominik@gmail.com [2011-06-10 Fri 09:20]
> Hi, I need a few testers:  Something very strange is going on here.
>
> When I evaluate this form
>
> (decode-time (days-to-time (time-to-days (current-time))))
>
> I get a date in the year 3980.  I think this used to work.
> Is there anyone who has an idea what is going on here?

(decode-time (days-to-time (time-to-days (current-time))))
 => (0 0 1 10 6 3980 2 t 3600)

With "GNU Emacs 24.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 2.20.1) of
2011-02-10 on keller, modified by Debian".

(time-to-days) returns the number of days since 0001-12-31bce, which
(days-to-time) converts into a time value. That time value is relative
to 0001-12-31bce, _not_ relative to 1970-01-01, which is what
(decode-time) is expecting.

Hence you end up 1970 years out.