Django DateTimeField to compare with datetime.now ()

I have DateTimeField:

class Assignment (models.Model):
   official_deadline = models.DateTimeField(null=True, blank=True)

I need to compare it with the current time, I tried:

def official_deadline_past(self):
    if datetime.datetime.today() > self.official_deadline:
        return True
    return False

But he always comes back. FalseI also tried:

def official_deadline_past(self):
    if datetime.datetime.now() > self.official_deadline:
        return True
    return False

But I have the same problem.

I have information in the field: 2011-07-02 00:00:00for example, in the form generatedModelForm