问查找m2m关系

EN

class Day(models.Model):
    day = models.CharField(max_length=3)
    def __unicode__(self):
        return "%s"%(self.day)

class Job(models.Model):
    name = models.CharField(max_length=32, unique=True)
    ...
    start = models.TimeField()
    end = models.TimeField()
    days = models.ManyToManyField(Day)

today = datetime.date.today()
dayofweek = today.strftime("%a")
DAY = Day.objects.get(day=dayofweek)

#not sure how i would 'filter' this to get the results i need