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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: expiry problems?
Date: Sat, 10 Nov 2001 12:11:11 +0100
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Josh Huber <huber@alum.wpi.edu> writes:

> This is fine, except for the fact that the nnmail-expired-article-p
> function returns nil for VERY old articles.
>
> because of this piece of code:
>
> (time-less-p days (time-since time))
>
> time-since returns a negative number for articles before 1970...
>
> touch -d "Jan 1 1940" <first article in nnml directory>
>
> and your articles will never be expired in that group.
>
> My clock must have been set wrong while those messages were created,
> and they're in each group I have keeping everything from being
> expired.
>
> anyway, here is my fix, should I commit?  I'm asking since it really
> seems like a hack.  The real fix is probably to time-since...

I don't grok what is happening, the functions seems to handle negative
dates for me:

(time-less-p (days-to-time 7)
             (time-since (date-to-time "Jan 1 00:00:00 1940")))
t

Can you provide some more info on which values you see?