title: Input type DateTime - Value format?
body: <p>In which format should I put the date and time, for use in the HTML5 input element with <code>datetime</code> type?</p>
  
  <p>I have tried:</p>
  
  <ul>
  <li><code>1338575502</code></li>
  <li><code>01/06/2012 19:31</code></li>
  <li><code>01/06/2012 19:21:00</code></li>
  <li><code>2012-06-01</code></li>
  <li><code>2012-06-01 19:31</code></li>
  <li><code>2012-06-01 19:31:00</code></li>
  </ul>
  
  <p>None of them seem to work.</p>