The documentation for versions of Python from 3.8 to-date include a cautionary note in the `datetime` module to indicate that the [`datetime.utcfromtimestamp`](https://docs.python.org/3.8/library/datetime.html#datetime.datetime.utcfromtimestamp) is no-longer-recommended, and that [`datetime.fromtimestamp`](https://docs.python.org/3.8/library/datetime.html#datetime.datetime.fromtimestamp) is preferred. One of the Python code snippets that we include on the [`SOURCE_DATE_EPOCH` documentation page](https://salsa.debian.org/reproducible-builds/reproducible-website/-/blob/de1870906345996ee741879abd367f7eabb473da/_docs/source-date-epoch.md#L99-107) uses `datetime.utcfromtimestamp` -- so we may want to upgrade/migrate that. I'll try to look at this soon.