title: django dateTimeField deltat
body: <p>I would like know the delta between the creation of a model row and now.
  For the moment I have:</p>
  
  <pre><code> from datetime import date, time, datetime
  from django.utils import timezone
  before= self.begin_current_player#models.DateTimeField(auto_now_add=True)
  before= datetime(before.year, before.month, before.day, before.hour, before.minute,before.second)
  now_date= datetime.now()
  delta_seconde = int((before-now_date).seconds)
  </code></pre>
  
  <p>But the result is very strange(sometime >0 , sometime &lt;0,sometime error type error).
  Do you have a idea ? 
  thx</p>