title: PHP Date function not working properly
body: <p>Why is my PHP code giving me the wrong result the following code:</p>
  
  <pre><code>date_default_timezone_set('UTC');
  echo date('d-m-Y');
  </code></pre>
  
  <p>Is working and producing:</p>
  
  <pre><code>30-01-2013
  </code></pre>
  
  <p>However this code:</p>
  
  <pre><code>date_default_timezone_set('UTC');
  echo date('d-m-Y',strtotime("+1 month"));
  </code></pre>
  
  <p>Is producing this date:</p>
  
  <pre><code>02-03-2013
  </code></pre>
  
  <p>Instead of:</p>
  
  <pre><code>28-02-2013
  </code></pre>
  
  <p>However I only need the month number.</p>