QDateTimeEdit's default constructor instantiates the start of
1752-09-14 as its default earliest time; however Friedeman has seen
this triggering an assertion. The QDTE tests should be picking that up
anyway, but let's overtly test it in QDate's startOfDay testing, too.
Change-Id: Ifae87f2695ac3a7993c173a7c21809c87d5daa71
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
f0333355dd