I have two objects that represent the same event instance — one holds the date, the other the time of this event, and I want to create a datetime object.

Since one can’t simply add date and time objects (following call fails):

 datetime.date(2011, 01, 01) + datetime.time(10, 23)

It’s in the python docs.

import datetime
datetime.datetime.combine(datetime.date(2011, 1, 1), 
                          datetime.time(10, 23))

returns

datetime.datetime(2011, 1, 1, 10, 23)