code: def rnd_date(self, start=date(1970, 1, 1), end=date.today()):
          
          if isinstance(start, string_types):
              start = self.str2date(start)
          if isinstance(end, string_types):
              end = self.str2date(end)
          if start > end:
              raise ValueError("start time has to be earlier than end time")
          return date.fromordinal(
              random.randint(start.toordinal(), end.toordinal()))
docs: Generate a random date between ``start`` to ``end``.
  
          :param start: Left bound
          :type start: string or datetime.date, (default date(1970, 1, 1))
          :param end: Right bound
          :type end: string or datetime.date, (default date.today())
          :return: a datetime.date object
  
          **中文文档**
  
          随机生成一个位于 ``start`` 和 ``end`` 之间的日期。