$scope.isDisabled = function (date,startDateOfMonth,noOfDays) {
                if (noOfDays!=0 && angular.isDefined(noOfDays)) {
                    var dateStart = new Date($scope.calendar.year,$scope.calendar.month,startDateOfMonth);
                    var dateEnd = angular.copy(dateStart);
                    dateEnd.setDate(dateStart.getDate()+parseInt(noOfDays));