title: Strtotime() doesn't work with dd/mm/YYYY format
body: <p>I really like the <code>strtotime()</code> function, but the user manual doesn't give a complete description of the supported date formats. <code>strtotime('dd/mm/YYYY')</code> doesn't work, it works only with <code>mm/dd/YYYY</code> format.</p>
  
  <p>If I have date in <code>dd/mm/YYYY</code> format, how can I convert it to <code>YYYY-mm-dd</code>?
  I can do it by using <code>explode()</code> function, but I think there are better solutions.</p>