fullCalendar – Comparing selected dates

I want the user to be able to select a date when they want to schedule an appointment, but when the user selects a date, I want the end-date to be == OR === to the start-date if the user only selects a particular date. However, when that user selects multiple dates on the calendar, I want the end-date to be different to the start-date.

Below, I ran an if/else statement to compare the dates selected. I was expecting to get a return of the selected start-date the same as the end-date, but it returned me the outcome of the else statement.

select: function (start, end, allDay) {
            endtime = $.fullCalendar.formatDate(end, 'MMMM DD, YYYY');
            starttime = $.fullCalendar.formatDate(start, 'MMMM DD, YYYY');
            var when = starttime;
            var to  = endtime;
             $('#createEventModal #apptStartTime').val(start);
             $('#createEventModal #apptEndTime').val(end);
             $('#createEventModal #apptAllDay').val(allDay);
             $('#createEventModal #when').text(when);
                    if (Date.mywhen == Date.myto) {

                        $('#createEventModal #to').text(mywhen);

                    } else {

                        $('#createEventModal #to').text(myto);

                    }           
$('#createEventModal').show();