> > > I can add days to now(), but not subtract?
>
> The problem is that it is meaningful to subtract two absolute times,
> giving a delta time as a result, *and* it is meaningful to subtract a
> delta time from an absolute time, giving another absolute time as a
> result.
It would be nice if we could decide '30 days' is a delta time because
it is not suitable for an absolute time representation. Would it be
hard?
--
Tatsuo Ishii