def add_arguments(self, parser):
        parser.add_argument('offering_slug', type=str, help='CourseOffering slug')
        parser.add_argument('activity_slug', type=str, help='the slug of the Activity with the quiz')
        parser.add_argument('section', type=str, help='lab/tutorial section to modify')
        parser.add_argument('start_time', type=parse_datetime, help='start time for this section')
        parser.add_argument('end_time', type=parse_datetime, help='end time for this section')