easyui datebox 不以选择未来时间

//统计日期符初值
            var oldTime = (new Date()).getTime();
            var now = new Date(oldTime).Format("yyyy-MM-dd");
            $('#txtStartDate').datebox({ value: now}).datebox('calendar').calendar({
                validator: function (date) {
                    var now = new Date();
                    var d1 = new Date(now.getFullYear(), now.getMonth(), now.getDate());
                    return d1 >= date;
                }
            });