You need to change nextDayThreshold: '09: 00: 00 ', // 9am option
See http://jsfiddle.net/3E8nk/440/
$('#calendar').fullCalendar({ header: { left: 'prev,next today', center: 'title', right: 'month,agendaWeek,agendaDay' }, defaultDate: '2014-09-15', editable: true, nextDayThreshold: '00:00:00', // 9am events: [ { title: 'Birthday Party', start: '2014-09-15T10:00:00', end: '2014-09-17T06:00:00' } ] });
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