But the datatype for date-time objects is namespaced as datetime.datetime. If you just enter import datetime into a Python program, you’re only importing the datetime library.

Python 3 adoption was slowed for the longest time by the relative lack of third-party library support. Many Python libraries supported only Python 2, making it difficult to switch.

If you want to do time-of-day arthithmetic, the easiest thing to do is start with a datetime.datetime object with dummy values of year, month, and day, and add datetime.timedelta objects to it: ...