title: How do I calculate the year from (new Date).getTime()
body: <p>This should be simple math buy I just can't deduce it at the moment.
  getTime() should return a unix time stamp in milli-seconds and from there one should be able to figure out the year.</p>
  
  <pre><code>function theYear(timestamp){
      // answer
      return year;
  }
  </code></pre>