dumberer.py

class BookingManager(models.Manager):

    @property
    def _filters(self):

        today = datetime.now().date()
        tomorrow = today+timedelta(days=1)
        day_after_tomorrow = date_today+timedelta(days=2)
        this_morning = datetime.combine(date_today, DAY_CUTOFF_TIME)
        tomorrow_morning = datetime.combine(tomorrow, DAY_CUTOFF_TIME)
        day_after_tomorrow_morning = datetime.combine(day_after_tomorrow, DAY_CUTOFF_TIME)

        return {
            'depart_today': {'start__gte': this_morning, 'start__lt': tomorrow_morning},
            'arrive_today': {'end__gte': this_morning, 'end__lt': tomorrow_morning},
            'depart_tomorrow': {'start__gte': tomorrow_morning, 'start__lt': day_after_tomorrow_morning},
            'arrive_tomorrow': {'end__gte': self.tomorrow_morning, 'end__lt': self.day_after_tomorrow_morning},
        }

    @property
    def depart_today(self):
        return Booking.objects.filter(**self._filters['depart_today'])

    @property
    def arrive_today(self):
        return Booking.objects.filter(**self._filters['arrive_today'])

    @property
    def depart_tomorrow(self):
        return Booking.objects.filter(**self._filters['depart_tomorrow'])

    @property
    def arrive_tomorrow(self):
        return Booking.objects.filter(**self._filters['arrive_tomorrow'])

    @property
    def arrive_depart_today(self):
        return self.depart_today | self.arrive_today

    @property
    def arrive_depart_tomorrow(self):
        return self.depart_tomorrow | self.arrive_tomorrow