def is_correct_as_date_test4(): assert(is_correct_as_date("2015/03/99") is False)
def is_correct_as_date_test3(): assert(is_correct_as_date("2015/03-21") is False)
def is_correct_as_date_test1(): assert(is_correct_as_date("2015/03/21") is True)
def is_correct_as_date_test2(): assert(is_correct_as_date("2015-03-21") is True)
def is_correct_as_date_test0(): assert(is_correct_as_date(set()) is False)