How to calculate different between two date()?
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/676824/how-to-calculate-the-difference-between-two-dates-using-php">How to calculate the difference between two dates using PHP?</a>  </p>
</blockquote>



<p>I have two time in this format: <code>date("Y-m-d H:i:s")</code>.
How can I calculate different between these two time?</p>
