Python time comparison


Question

How do I compare times in python?

I see that date comparisons can be done and there's also "timedelta", but I'm struggling to find out how to check if the current time (from datetime.now()) is earlier, the same, or later than a specified time (e.g. 8am) regardless of the date.

1
77
12/2/2009 8:27:35 AM

Accepted Answer

You can't compare a specific point in time (such as "right now") against an unfixed, recurring event (8am happens every day).

You can check if now is before or after today's 8am:

>>> import datetime
>>> now = datetime.datetime.now()
>>> today8am = now.replace(hour=8, minute=0, second=0, microsecond=0)
>>> now < today8am
True
>>> now == today8am
False
>>> now > today8am
False
104
12/2/2009 8:32:21 AM

You can use the time() method of datetime objects to get the time of day, which you can use for comparison without taking the date into account:

>>> this_morning = datetime.datetime(2009, 12, 2, 9, 30)
>>> last_night = datetime.datetime(2009, 12, 1, 20, 0)
>>> this_morning.time() < last_night.time()
True

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