import datetime # bad format datetime.datetime.strptime("something", "%H:%M:%S%Z") # no replace or astimezone datetime.datetime.strptime("something", "something") # wrong replace datetime.datetime.strptime("something", "something").replace(hour=1) # none replace datetime.datetime.strptime("something", "something").replace(tzinfo=None) # OK datetime.datetime.strptime("something", "something").replace( tzinfo=datetime.timezone.utc ) # OK datetime.datetime.strptime("something", "something").astimezone() # OK datetime.datetime.strptime("something", "%H:%M:%S%z") # OK datetime.datetime.strptime("something", something).astimezone() # OK datetime.datetime.strptime("something", something).replace(tzinfo=datetime.timezone.utc) from datetime import datetime # no replace orastimezone unqualified datetime.strptime("something", "something")