I have done this in my fullcalendar and it’s working perfectly.
you can add this code in your select function.
select: function(start, end, allDay) {
var check = $.fullCalendar.formatDate(start,'yyyy-MM-dd');
var today = $.fullCalendar.formatDate(new Date(),'yyyy-MM-dd');
if(check < today)
{
// Previous Day. show message if you want otherwise do nothing.
// So it will be unselectable
}
else
{
// Its a right date
// Do something
}
},
I hope it will help you.