title: PHP strtotime date difference
body: <p>I want to get the age of users.
  I tried:</p>
  
  <pre><code>$dStart = strtotime('1985-10-24');
      $dEnd   = strtotime('2014-07-30');
      $dDiff  = $dEnd - $dStart;
      echo date('Y',$dDiff);
  </code></pre>
  
  <p>But get 1998 instead 28, what would be the right code? </p>