title: Adding one day to a date
body: <p>My code to add one day to a date returns a date before day adding: 
  <code>2009-09-30 20:24:00</code> date after adding one day SHOULD be rolled over to the next month: <code>1970-01-01 17:33:29</code></p>
  
  <pre><code>&lt;?php
  
      //add day to date test for month roll over
  
      $stop_date = date('Y-m-d H:i:s', strtotime("2009-09-30 20:24:00"));
  
      echo 'date before day adding: '.$stop_date; 
  
      $stop_date = date('Y-m-d H:i:s', strtotime('+1 day', $stop_date));
  
      echo ' date after adding one day. SHOULD be rolled over to the next month: '.$stop_date;
  ?&gt;
  </code></pre>
  
  <p>I have used pretty similar code before, what am I doing wrong here?</p>