Documentation

https://docs.python.org/3/library/os.html#os.stat_result says:

st_mtime

Time of most recent content modification expressed in seconds.

Number of seconds is a duration. The docs should explain how to turn this into a time. datetime.datetime.fromtimestamp() seems to be the answer.

Linked PRs

• gh-137758: Clarify os.stat_result time fields (since Unix epoch) and add datetime conversion note #137761