Full Calendar Events not showing up

this is my code. There is no error but i don't know why my events are not showing up in the calendar.

events: function (start, end, timezone, callback) {
        $.ajax({
            url: '/Events/GetEvents',
            dataType: 'json',
            type: 'POST',
            success: function (list) {
                var events = [];
                $.each(list, function (index, value) {
                    var date = new Date(value.startDate.split(' ')[0]);
                    var start = date.getFullYear() + "-" + (date.getMonth() + 1) + "-" + date.getDate() + "T" + value.startTime + ":00";
                    date = new Date(value.endDate.split(' ')[0])
                    var end = date.getFullYear() + "-" + (date.getMonth() + 1) + "-" + date.getDate() + "T" + value.endTime + ":00";
                    events.push({
                        id: value.ID,
                        title: value.Title,
                        start: start,
                        end: end,
                        allDay: value.isFullDayEvent
                    });
                    callback(events);
                });
            }
        });
    }