There is a precedent in the Emacs manual -- Appendix E, Antinews: "For
those users who live backwards in time [...]"

:-)

I admit there may not be great practical utility in a negative time
range.  But the interval is well-defined so it ought to be computed
correctly.  I would say that a wrong answer is worse than no answer
since it may be believed correct at first glance, when it is not.

Anyway, I'm including a patch for 6.09 which seems to fix the problem....

On Thu, Oct 16, 2008 at 12:39 PM, Carsten Dominik
<dominik@science.uva.nl> wrote:
> Hi Chris,
>
> what could possibly be the purpose of a negative time range?  Are you
> working for a secret government agency?
>
> :-)
>
> - Carsten