code: def _concat_same_dtype(self, to_concat, name):
          
          attribs = self._get_attributes_dict()
          attribs['name'] = name
          # do not pass tz to set because tzlocal cannot be hashed
          if len({str(x.dtype) for x in to_concat}) != 1:
              raise ValueError('to_concat must have the same tz')
  
          new_data = type(self._values)._concat_same_type(to_concat).asi8
  
          # GH 3232: If the concat result is evenly spaced, we can retain the
          # original frequency
          is_diff_evenly_spaced = len(unique_deltas(new_data)) == 1
          if not is_period_dtype(self) and not is_diff_evenly_spaced:
              # reset freq
              attribs['freq'] = None
  
          return self._simple_new(new_data, **attribs)
docs: Concatenate to_concat which has the same class.