title: django models.DateField prevent past
body: <p>I am looking for ways to prevent user from entering past dates in in django admin page. Something like this:</p>
  
  <p><a href="https://stackoverflow.com/questions/4941974/django-how-to-set-datefield-to-only-accept-today-future-dates">Django: How to set DateField to only accept Today &amp; Future dates</a></p>
  
  <p>My model looks like this:</p>
  
  <pre><code>class MyModel(models.Model):
      date = models.DateField(null=True, blank=True, default=None)
  </code></pre>