jquery比较时间大小

  // 处理时间
        function NewDate(str) {
            str = str + "";
            str = str.split('-');
            var date = new Date();
            date.setUTCFullYear(str[0], str[1] - 1, str[2]);
            date.setUTCHours(0, 0, 0, 0);
            return date;
        }

            var bDate = NewDate($("#PlanBeginDate").val());
            var eDate = NewDate($("#PlanEndDate").val());
            var IntervalDay = ((eDate - bDate) / 1000 / 60 / 60 / 24) + 1; //间隔时间
            if (IntervalDay <= 0) {
                alert("开始时间晚于结束时间!");
                return false;
            }