<script type="text/javascript">
        var curDt = new Date();
        function disablementFunction(day){
            if (day.isWeekend) return false;
            if (curDt==undefined){
                curDt = day.date.getDate;
            }
            if (curDt.getTime() - day.date.getTime() &lt; 0) return true; else return false;  
        }
        function disabledClassesProv(day){
            if (curDt.getTime() - day.date.getTime() &gt;= 0) return 'rich-calendar-boundary-dates';
            var res = '';
            if (day.isWeekend) res+='weekendBold ';
            if (day.day%3==0) res+='everyThirdDay';
            return res;
        }
    </script>