title: What is location of django Built-in tags and filters?
body: <p>What is location of django Built-in tags and filters? I cant find anywhere... I need it to format datetime so then i can send right formt in JSON by AJAX response.. Or maybe you can suggest me another way to do that...</p>
  
  <p>What i want to do it's import function which determinate filter... and use it to format my datetime in JSON.</p>
  
  <p>Look.. i have... </p>
  
  <pre><code>media_items = Media.objects.filter(blablabla=blablabla)
  </code></pre>
  
  <p>than i do</p>
  
  <pre><code>data = serializers.serialize('json', media_items, fields=('name','duration','on_air'))
  </code></pre>
  
  <p>How can I do so in <code>data</code>(what is JSON) i have right date format? What is the simplest way?</p>