title: Django filtering a queryset for items less than half an hour old
body: <pre><code>class Action(models.Model):
      user = models.ForeignKey('auth.User', related_name='actions')
      date = models.DateTimeField(editable=False, null=True, blank=True)
  </code></pre>
  
  <p>Using this as an example, say I wanted to filter all actions by a particular user that are less than half an hour old?</p>