title: moment js extract year from string
body: <p>I'm new to moment.js and I can't really understand the documentation. I'd like to manipulate some dates in string format.</p>
  
  <p>I have my date as string from json feed and looks like:</p>
  
  <pre><code>var year = item.date
  // it returns a string like "25/04/2012"
  </code></pre>
  
  <p>How do I extract the year from it using moment.js ?</p>