[Python-Dev] Issue5434: datetime.monthdelta

Jon Ribbens jon+python-dev at unequivocal.co.uk
Thu Apr 16 12:47:26 CEST 2009

On Thu, Apr 16, 2009 at 12:10:36PM +0400, Oleg Broytmann wrote:
> > This patch adds a "monthdelta" class and a "monthmod" function to the
> > datetime module.  The monthdelta class is much like the existing
> > timedelta class, except that it represents months offset from a date,
> > rather than an exact period offset from a date.
>    I'd rather see the code merged with timedelta: timedelta(months=n).

Unfortunately, that's simply impossible. A timedelta is a fixed number
of seconds, and the time between one month and the next varies.

I am very much in favour of there being the ability to add months to
dates though. Obviously there is the question of what to do when you
move forward 1 month from the 31st January; in my opinion an optional
argument to specify different behaviours would be nice.

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