Python-сообщество

from datetime import timedelta
class MyModel (models.Model):
    name = models.CharField()
    first_date = models.DateTimeField ()
    second_date = models.DateTimeField ()

    def simple_def (self):
        max_sec = 432000
        res_date = self.second_date - self.first_date
        if (timedelta (seconds = max_sec) > res_date):
                ret_val = 1
            else:
                ret_val = 0
        return ret_val

MyModel.objects.filter (simple_def=1)