title: how to format time in django-rest-framework's serializer?
body: <p>there is my serializer code:<br>
  <strong>serializer.py</strong></p>
  
  <pre><code>class StartListSerializer(serializers.Serializer):
      id = serializer.CharField()
      time = serializers.DateField(fromat=None, input_formats=None) 
  </code></pre>
  
  <p>it will give me this:<br>
  <code>'time': '2014-03-14T22:44:16.923000'</code><br>
  the input time format is <code>datetime.datetime(2014, 3, 14, 22, 44, 37, 280000)</code><br>
  But I want to get time like this <code>2014-03-14 22:44:37</code><br>
  how can I change my serializer to get this time?</p>