def unexpired_acknowledgements(self):
        acknowledgements = self.alertacknowledgement_set.all().filter(
            time__gte=timedelta(minutes=settings.ACKNOWLEDGEMENT_EXPIRY)-timezone.now(),
            cancelled_time__isnull=True,
        ).order_by('-time')
        return acknowledgements
dataset/ETHPy150Open arachnys/cabot/cabot/cabotapp/models.py/CheckGroupMixin.unexpired_acknowledgements/swapped operands of `-`