def test_newSingleDigitDayOfMonth(self):
        """
        A file with a high-resolution timestamp which falls on a day of the
        month which can be represented by one decimal digit is formatted with
        one padding 0 to preserve the columns which come after it.
        """
        # A point about three months in the past, tweaked to fall on the first
        # of a month so we test the case we want to test.
        then = self.now - (60 * 60 * 24 * 31 * 3) + (60 * 60 * 24 * 4)
        stat = os.stat_result((0, 0, 0, 0, 0, 0, 0, 0, then, 0))

        self.assertEqual(
            self._lsInTimezone('America/New_York', stat),
            '!---------    0 0        0               0 Sep 01 17:33 foo')
        self.assertEqual(
            self._lsInTimezone('Pacific/Auckland', stat),
            '!---------    0 0        0               0 Sep 02 09:33 foo')

        A file with a high-resolution timestamp which falls on a day of the
        month which can be represented by one decimal digit is formatted with
        one padding 0 to preserve the columns which come after it.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_cftp.py