docs: def _patchDatetimeMetadata( self, res, mk ):
          """Private method to patch an ISO datetime string to a datetime object
          for metadata key mk.
  
          :param res: results dict
          :param mk: metadata key"""
          t = res[epyc.Experiment.METADATA][mk]
          res[epyc.Experiment.METADATA][mk] = dateutil.parser.parse(t)