Prevent date overflow in Assertion::date() by reset preset date value #250
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This PR fixes a date format assertion bug or gotcha caused by
DateTime::createFromFormat().For example,
Assertion::date('2018-04', 'Y-m')would throw in May 31 2018.See
https://stackoverflow.com/questions/21473817/wrong-month-february-datetimecreatefromformat#21473903.
The applied solution was prepending '!' to user specified format before passing it to createFromFormat().
Apparently, it's not a problem if we have duplicated '!' s in a format string.