title: moment().format() and fullcalendar: undefined is not a function
body: <p>I'm trying to use moment().format() with fullcalendar; I have this code:</p>
  
  <pre><code>&lt;script src="&lt;?php echo ASSETS_URL; ?&gt;/js/plugin/fullcalendar/lib/moment.js"&gt;&lt;/script&gt;
  &lt;script&gt; moment().format() &lt;/script&gt; 
  &lt;script type="text/javascript"&gt;
   $('#calendar').fullCalendar({
  
          header: hdr,
          buttonText: {
              prev: '&lt;i class="fa fa-chevron-left"&gt;&lt;/i&gt;',
              next: '&lt;i class="fa fa-chevron-right"&gt;&lt;/i&gt;'
          },
          defaultView: "agendaWeek",
          editable: true,
          droppable: false, // this allows things to be dropped onto the calendar !!!
          lang: 'it',
          timeFormat: 'H(:mm)',
          firstDay: 1,
          drop: function (date, allDay) { // this function is called when something is dropped
  
  
          events: [{
  
          }],
          eventDragStart: function( event, jsEvent, ui, view ) { 
              ev_start=event.start.moment().format("dddd (d) DDD - D/MM/YY");
              console.log(ev_start);
              },
  
          },
  </code></pre>
  
  <p>When I drag an element from calendar there is this error:
  Uncaught TypeError: undefined is not a function </p>
  
  <p>I done some debug and the error is caused by moment().format()
  Anyone could help me?</p>