title: Method findBy() from Doctrine with DateTime
body: <p>I have the following code, but this would not work:</p>
  
  <pre><code>$event= $this-&gt;getDoctrine()
          -&gt;getRepository('AppBundle:Event')
          -&gt;findBy(
              array(
                  "datestart" =&gt; array(new \DateTime())
              )
          );
  </code></pre>
  
  <p>I need a list of the  events, which are newer then now.</p>
  
  <p>Where is my misstake?</p>
  
  <p>Or isn't that able to get with the default findBy() function of doctrine ?</p>