title: Current datetime in XML
body: <p>I use python date time function without problem using XML time.strftime but it's impossible</p>
  
  <pre><code>&lt;tree string="Mission" colors="blue:datetime_field &gt; time.strftime('%d-%m-%Y %H:%M:%S')"&gt;
  </code></pre>
  
  <p>Same problem with datetime.datetime.now() and DateTime.today()</p>