title: Django - Group By with Date part alone
body: <pre><code>MyModel.objects.filter(created_at__gte='2011-03-09', created_at__lte='2011-03-11').values('created_at','status').annotate(status_count=Count('status'))
  </code></pre>
  
  <p>The above query has the problem with the <code>created_at</code> datetime field. Is it possible to tune the above query to ignore the time value and use the date value alone while performing group by?</p>