title: Can't subtract datetime and timestamp in django?
body: <p>I have a field timestamp = models.DateTimeField(auto_now_add=True) in the db. I want to find the difference between that timestamp and datetime.now().</p>
  
  <p>When I tried datetime.now() - timestamp, I get the error:</p>
  
  <pre><code>can't subtract offset-naive and offset-aware datetimes
  </code></pre>
  
  <p>How do I fix this?</p>