Fix `OverflowError`.
Fix `OverflowError`.

It doesn't seem to be possible to localise `datetime.min` without raising
`OverflowError`, so create a timezone aware object manually.

ic-labs/django-icekit,ic-labs/icekit-events,ic-labs/django-icekit,ic-labs/icekit-events,ic-labs/icekit-events,ic-labs/django-icekit,ic-labs/django-icekit