title: Change date y-M to Y-m in php
body: <p>I want to make date from <code>11-Mar</code> to <code>2011-03</code>. But I think php is thinking <code>11-Mar</code> is <code>2012-Mar-11</code>. How can i do it?</p>
  
  <p>value : 11-Mar</p>
  
  <p>expect : 2011-03</p>
  
  <p>result : 2012-03 [<code>date(strtotime('11-Mar'))</code>] </p>