title: update value of a variable inside a template - django
body: <p>I have seen enough number of examples that allow me to declare a new variable inside a template and set its value. But what I want to do is to update the value of a particular variable inside the template.</p>
  
  <p>For example I have a datetime field for an object and I want to add timezone according to the <code>request.user</code> from the template. So I will create a <code>template filter</code> like <code>{% add_timezone object.created %}</code> and what it will do is that it will add timezone to <code>object.created</code> and after that whenever I access <code>{{object.created}}</code> it will give me the updated value.</p>
  
  <p>Can anybody tell me how this can be done. I know I need to update the <code>context</code> variable from the template filter. But don't know how.</p>