title: Facebook Open Graph date format
body: <p>When generating a meta tag for <code>article:published_time</code> or <code>og:updated_time</code>, in what format should I put the time. Some documentation in Facebook says it should be in Unix epoch and other documentation suggest is should be in ISO 8601.</p>
  
  <p><code>&lt;meta property="og:updated_time" content="1414056907" /&gt;</code> or</p>
  
  <p><code>&lt;meta property="og:updated_time" content="2013-01-22T09:10:08+0100" /&gt;</code></p>
  
  <p>Thank you for looking in to this.</p>
  
  <p>Sander</p>