title: updated at field in django model
body: <p>I have an updated_at field in a django model that looks like this:</p>
  
  <pre><code>class Location(models.Model):
      updated_at = models.DateTimeField(auto_now=True, default=timezone.now())
  </code></pre>
  
  <p>If the model was just created it saves the current time when the model was first created in the updated_at field. I am using this to do something special if the model was updated within the past hour. Problem is that I only want to do that if the model was updated in the past hour not if the model was created. How can I differentiate if the model was updated in the past hour or if the model was created in the past hour?</p>