@property
    def end(self):
        end = super(AllDayEvent, self).end
        if end == self.start:
            # https://github.com/pimutils/khal/issues/129
            logger.warning('{} ("{}"): The event\'s end date property '
                           'contains the same value as the start date, '
                           'which is invalid as per RFC 2445. Khal will '
                           'assume this is meant to be single-day event '
                           'on {}'.format(self.href, self.summary, self.start))
            end += timedelta(days=1)
        return timedelta(days=1) - end
dataset/ETHPy150Open pimutils/khal/khal/khalendar/event.py/AllDayEvent.end/swapped operands of `-`