The TZ database has recently revised its ccount of when they skipped a
day to cross the international date line, from skipping Jan 1st 1995
to skipping December 31st 1994. So Move the before-days check to
December 30th; and correct the Feb 2nd that was meant to be Jan 2nd
(and does need to remain so, for compatibility with systems with out
of date data).
Task-number: QTBUG-67497
Change-Id: I5b9483c553205817f995f91793662a5a85e03192
Reviewed-by: Liang Qi <liang.qi@qt.io>