def time_of_last_submission_update(self):
        try:
            # we also consider deleted instances in this case
            return self.instances.latest("date_modified").date_modified
        except __HOLE__:
            pass
dataset/ETHPy150Open kobotoolbox/kobocat/onadata/apps/logger/models/xform.py/XForm.time_of_last_submission_update