Adding a day in Python datetimes - use timedelta, not the datetime constructor

If you want "tomorrow" in Python datetimes, don't construct a datetime like this:

from datetime import datetime, timedelta
td = datetime.today()
tm1 = datetime(td.year, td.month, td.day + 1, 14, 0, 0)
# Don't do this!

Because it will work sometimes, but fail when today is the last day of the month:

Traceback (most recent call last):
 File "./tomorrow", line 6, in
   tm1 = datetime(td.year, td.month, td.day + 1, 14, 0, 0)
ValueError: day is out of range for month

Instead, use Python's timedelta, which is designed for this purpose:

from datetime import datetime, timedelta

td = datetime.today()
tm2 = td + timedelta(days=1)

print("tm2=%s" % str(tm2))

And it's easier to read too.

Originally posted at 2017-08-07 07:30:38+00:00. Automatically generated from the original post : apologies for the errors introduced.

original post

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