How to subtract dates with python

Question

Today =

today = datetime.datetime.now().strftime(\"%Y%m%d\")

90days ago

DD = datetime.timedelta(days=-90)

<

Answer 1

Just subtract a timedelta from a datetime:

>>> import datetime
>>> today = datetime.datetime.today()
>>> DD = datetime.timedelta(days=90)
>>> today - DD
datetime.datetime(2010, 11, 3, 9, 56, 20, 924224)

(or if you want to use a negative timedelta like you did there, add them:

>>> DD = datetime.timedelta(days=-90)
>>> today + DD
datetime.datetime(2010, 11, 3, 9, 56, 20, 924224)