title: ZF2 "Zend\Form\Element\Time" gives wrong message
body: <p>I've got the following element in my form but on submit it keeps giving the message "The input does not appear to be a valid date". It's not a date it's a Time element. I've got no filters applied to it.</p>
  
  <pre><code>    $this-&gt;add(array(
          'name' =&gt; 'starttime',
          'type' =&gt; 'Zend\Form\Element\Time',
          'options' =&gt; array(
              'label' =&gt; _("Start time"),
              'format' =&gt; 'H:i:s'
          ),
          'attributes' =&gt; array(
              'min' =&gt; '00:00:00',
              'max' =&gt; '23:59:59',
              'step' =&gt; 60 * 15, // seconds; default step interval is 60 seconds
          )
      ));
  </code></pre>
  
  <p>What am i doing wrong?</p>