Multiple release notes on same date get presented in wrong order

[the-mace]

If you create 2 release notes for the same date it can (does for me) show the oldest one as the "latest" release note.

This seems to be because of this:
ordering = ["-release_date"]
That's a date object, not a date time. So maybe it should be
ordering = ["-release_date", -"modified"]
or something like that?