Modern Python Standard Library Cookbook

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If your time instance has a time zone (tzinfo), combining the date with the time will also preserve it:

>>> t = datetime.time(13, 30, tzinfo=datetime.timezone.utc)
>>> datetime.datetime.combine(d, t)
datetime.datetime(2018, 1, 11, 13, 30, tzinfo=datetime.timezone.utc)

If your time doesn't have a time zone, you can still specify one when combining the two values:

>>> t = datetime.time(13, 30)
>>> datetime.datetime.combine(d, t, tzinfo=datetime.timezone.utc)

Providing a time zone when combining is only supported for Python 3.6+. If you are working with a previous Python version, you will have to set the time zone into the time value.