Class SubclassDate

Lib/test/datetimetester.py:1219–1220

            date.strptime('02-29,2024', '%m-%d,%Y')

class SubclassDate(date):
    sub_var = 1

class TestDate(HarmlessMixedComparison, unittest.TestCase):
    # Tests here should pass for both dates and datetimes, except for a