title: show ruby date as a RFC 3339 timestamp
body: <p>Does anyone know how I can convert a ruby time class instance into a RFC 3339 timestamp?</p>
  
  <p>The output should be something like this:</p>
  
  <blockquote>
    <p>"2013-10-13T13:34:52.000+02:00"</p>
  </blockquote>