tz.py 文件源码

def _isdst(self, dt):
        if not self._start_delta:
            return False
        year = datetime.datetime(dt.year, 1, 1)
        start = year+self._start_delta
        end = year+self._end_delta
        dt = dt.replace(tzinfo=None)
        if start < end:
            return dt >= start and dt < end
        else:
            return dt >= start or dt < end