title: fullCalendar, dayClick gives wrong time
body: <p>i am using fullCalendar bower: v3.9.* (=latest tag)
  when i click on a free slot 11:00
  then my function is triggered:</p>
  
  <pre><code>dayClick: function (momentDateFromFullcalendar) {
      // workaround, fullcalender gives me wrong time
      var momentDate = null;
      if (moment().isDST()) {
          momentDate = momentDateFromFullcalendar.add(-2, 'h');
      } else {
          momentDate = momentDateFromFullcalendar.add(-1, 'h');
      }
  
      logger.debug('clicked on date: ' + momentDate.toDate());
      vm.newTermin(momentDate);
  }
  </code></pre>
  
  <p>I get from fullcalendar as a param to my callback:</p>
  
  <p>ACTUAL:
  13:00 GMT+2</p>
  
  <p>EXPECT: 
  11:00 GMT +2</p>
  
  <p>(+2 = +1 CEST and +1 DST)</p>
  
  <p><a href="https://i.stack.imgur.com/Z4uDG.png" rel="nofollow noreferrer">screenshot</a></p>
  
  <p>timezone: 'Europe/Vienna',</p>
  
  <p>what am i doing wrong here?</p>