tzwin.py 文件源码

def _isdst(self, dt):
        if not self._dstmonth:
            # dstmonth == 0 signals the zone has no daylight saving time
            return False
        dston = picknthweekday(dt.year, self._dstmonth, self._dstdayofweek,
                               self._dsthour, self._dstminute,
                               self._dstweeknumber)
        dstoff = picknthweekday(dt.year, self._stdmonth, self._stddayofweek,
                                self._stdhour, self._stdminute,
                                self._stdweeknumber)
        if dston < dstoff:
            return dston <= dt.replace(tzinfo=None) < dstoff
        else:
            return not dstoff <= dt.replace(tzinfo=None) < dston