test_datetime.py 文件源码

def convert_between_tz_and_utc(self, tz, utc):
        dston = self.dston.replace(tzinfo=tz)
        # Because 1:MM on the day DST ends is taken as being standard time,
        # there is no spelling in tz for the last hour of daylight time.
        # For purposes of the test, the last hour of DST is 0:MM, which is
        # taken as being daylight time (and 1:MM is taken as being standard
        # time).
        dstoff = self.dstoff.replace(tzinfo=tz)
        for delta in (timedelta(weeks=13),
                      DAY,
                      HOUR,
                      timedelta(minutes=1),
                      timedelta(microseconds=1)):

            self.checkinside(dston, tz, utc, dston, dstoff)
            for during in dston + delta, dstoff - delta:
                self.checkinside(during, tz, utc, dston, dstoff)

            self.checkoutside(dstoff, tz, utc)
            for outside in dston - delta, dstoff + delta:
                self.checkoutside(outside, tz, utc)