javascript 时间倒计时代码

<script type="text/javascript" language="javascript">
            //任务剩余时间开始
            var StartDate = new Date("<?php echo date('Y/m/d H:i:s')?>");
            var EndDate = new Date("<?php echo date('Y/m/d H:i:s')?>");
            var TimeDiff = EndDate - StartDate;

            function TimeToString(Time){
                var strTime = '';
                if( Time<10){
                    strTime = "0" + Time.toString();
                }else{
                    strTime = Time.toString();
                }
                return strTime;
            }
            function TimeComputing(){
                TimeDiff = TimeDiff - 1000;
                var DayTime  = 86400000;
                var HourTime = 3600000;
                var MinTime  = 60000;
                var SecTime  = 1000;
                var DiffDay  = Math.floor(TimeDiff / DayTime);
                var DiffHour = Math.floor((TimeDiff % DayTime) / HourTime);
                var DiffMin  = Math.floor((TimeDiff % DayTime % HourTime) / MinTime);
                var DiffSec  = Math.floor((TimeDiff % DayTime % HourTime % MinTime) / SecTime);

                $('#TimeoutDay').html(TimeToString(DiffDay)+'天');
                $('#TimeoutHour').html(TimeToString(DiffHour)+'小时');
                $('#TimeoutMin').html(TimeToString(DiffMin)+'分');
                $('#TimeoutSec').html(TimeToString(DiffSec)+'秒');
            }
            //任务剩余时间结束
     IntervalId = setInterval('TimeComputing()',1000);
                    TimeComputing();
</script>