如何限制Fullcalender在过去几天禁用所有类型的操作

我想禁用过去几天的所有类型的操作。

这是我已经尝试过的：

http://jsfiddle.net/7MTdn/275/

我也在这里提供我的代码：

$('#mycalendar').fullCalendar(
            {
             header: {
                    left: 'prev,next today',
                    center: 'title',
                    right: 'month,agendaWeek,agendaDay'
                    },

                dayClick: function( date, allDay, jsEvent, view ) { 
                                    var getFromDate = date.getFullYear()+'-'+parseInt(date.getMonth()+1)+'-'+date.getDate();
                var newDate = new Date();
                var newD    = newDate.getDate();
                var newM    = newDate.getMonth();
                var newY    = newDate.getFullYear();
                var myDate  = newY+'-'+newM+'-'+newD;
                alert(Number(myDate));
                alert(Number(getFromDate));
                if(getFromDate<myDate)
                {
                    alert("Sorry! You cannot add event on past dates.");
                    return false;
                }
                else
                {
                    alert("You can add an event on this date");
                }

            },      
             events: [
                        {
                            title  : 'eventTest',
                            start  : '2013-12-18',
                            end    : '2013-12-26'
                        }
                    ]
           });