FullCalendar dow FAIL

FullCalendar v3.5 fails with dow

HTML

<!doctype html>

<html class="no-js" lang="en">

	<head>

		<link href='https://cdnjs.cloudflare.com/ajax/libs/fullcalendar/3.4.0/fullcalendar.min.css' rel='stylesheet'>
		<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
		<script src='//cdnjs.cloudflare.com/ajax/libs/moment.js/2.9.0/moment.min.js'></script>
		<script src='https://cdnjs.cloudflare.com/ajax/libs/fullcalendar/3.4.0/fullcalendar.min.js'></script>
	
	</head>
	
	<body>
	
		<main>
		
			<div class="inner">
				<div class="full">
				
					<h1>Events Calendar</h1>
					
					<div id="calendar">
					</div>
					
					<script>
            $(document).ready(function() {

              // page is now ready, initialize the calendar...

              $('#calendar').fullCalendar({

                timezone: 'local',
                columnHeaderFormat: 'dddd',
                firstDay: 1,
                timeFormat: 'H:mm',

                events: [{

                  title: 'All Day Event',
                  start: "2018-04-04T09:00:00",
                  dow: [3, 4, 5, 1]

                }]

              });

            });
					</script>
			
				</div>
			</div>
			
		</main>
			
	</body>
</html>