docs: def get_end_date_metadata(self):
          """Gets the metadata for an end date.
  
          return: (osid.Metadata) - metadata for the date
          *compliance: mandatory -- This method must be implemented.*
  
          """
          metadata = dict(self._end_date_metadata)
          metadata.update({'existing_date_time_values': self.my_osid_object_form._my_map['endDate']})
          return Metadata(**metadata)