code: def rnd_datetime_array(self,
                             size, start=datetime(1970, 1, 1), end=datetime.now()):
          
          if isinstance(start, string_types):
              start = self.str2datetime(start)
          if isinstance(end, str):
              end = self.str2datetime(end)
          if start > end:
              raise ValueError("start time has to be earlier than end time")
  
          return self.randn(size, self._rnd_datetime, start, end)
docs: Array or Matrix of random datetime generator.