title: strftime gets wrong date
body: <p>I'm using strftime to display future date.</p>
  
  <p>But while using</p>
  
  <pre><code>strftime('%a., %d. %B %Y',time()+60*60*24*4)
  </code></pre>
  
  <p>I'm getting Mo., 01. April 2013 instead of Su., 31.  March 2013 while using this today.</p>
  
  <p>(Unix timestamp is 1364423120)</p>
  
  <pre><code>strftime('%a., %d. %B %Y',time()+60*60*24*3)
  </code></pre>
  
  <p>displays the correct Sa., 30. March 2013</p>
  
  <p>What is wrong here with the last day of March?</p>