[Python-Dev] Issue5434: datetime.monthdelta (original) (raw)

Steven D'Aprano steve at pearwood.info
Fri Apr 17 04:42:45 CEST 2009

On Fri, 17 Apr 2009 07:47:14 am Antoine Pitrou wrote:

Jess Austin <jess.austin gmail.com> writes: > What other behavior options besides "last-valid-day-of-the-month" > would you like to see?

IMHO, the question is rather what the use case is for the behaviour you are proposing. In which kind of situation is it acceptable to turn 31/2 silently into 29/2?

Any time the user expects "one month from the last day of January" to mean "the last day of February". I dare say that if you did a poll of non-programmers, that would be a very common expectation, possibly the most common.

I just asked the missus, who is a non-programmer, what date is one month after 31st January and her answer was "2rd of March on leap years, otherwise 3rd of March".

-- Steven D'Aprano

More information about the Python-Dev mailing list