UTC的Javascript计时器取决于计算机时间？

所以这个脚本（归功于），基本上是一个Javascript每日倒计时。我将getDate变量更改为getUTCDate，但它仍然不是UTC，取决于客户端时钟。如何解决这个问题，使其不依赖于客户端计算机时间，以便在客户端计算机时间错误时不会错误显示倒计时？？谢谢

下面是javascript代码：

<script type="text/javascript">

var current = "Test";

var startHour = 0;

var startMinute = 0;

var endHour = 23;

var endMinute = 55;

var tz = 0;

var montharray=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec");

 if (startMinute < 10){startMinute = "0" + startMinute;}

function countdown()
{
var today=new Date();
var todayy=today.getYear();
if (todayy < 1000) 
{todayy += 1900;}

var todaym = today.getUTCMonth();
var todayd = today.getUTCDate();
var todayh = today.getUTCHours();
var todaymin = today.getUTCMinutes();
var todaysec = today.getUTCSeconds();

// add a zero in front of numbers<10
todaymin = checkTime(todaymin);
todaysec = checkTime(todaysec);

var startString = parseInt(startHour + "" + startMinute + "00");

var nowString1 = montharray[todaym] + " " + todayd + ", " + todayy + " " + todayh + ":" + todaymin + ":" + todaysec;
var nowString = Date.parse(nowString1) + (tz*1000*60*60);
var nowTime = parseInt(todayh + "" + todaymin + "" + todaysec);

var endString1 = (montharray[todaym] + " " + todayd + ", " + todayy + " " + endHour + ":" + endMinute);
var endString = Date.parse(endString1) - (today.getTimezoneOffset() * (1000*60));

var dd = endString - nowString;
var dday = Math.floor(dd/(60*60*1000*24)*1);
var dhour = Math.floor((dd%(60*60*1000*24))/(60*60*1000)*1);
var dmin = Math.floor(((dd%(60*60*1000*24))%(60*60*1000))/(60*1000)*1);
var dsec = Math.floor((((dd%(60*60*1000*24))%(60*60*1000))%(60*1000))/1000*1);

if ((dhour <= 0 && dmin <= 0 && dsec <= 0) || (nowTime < startString))
{
    document.getElementById('count2').innerHTML = current;
    document.getElementById('count2').style.display = "inline";
    document.getElementById('count2').style.width = "390px";
    document.getElementById('dhour').style.display = "none";
    document.getElementById('dmin').style.display = "none";
    document.getElementById('dsec').style.display = "none";
    document.getElementById('hours').style.display = "none";
    document.getElementById('minutes').style.display = "none";
    document.getElementById('seconds').style.display = "none";
    setTimeout("countdown()",500);
    return;
}

else
{
    document.getElementById('count2').style.display = "none";
    document.getElementById('dhour').style.display = "inline";
    document.getElementById('dmin').style.display = "inline";
    document.getElementById('dsec').style.display = "inline";
    document.getElementById('hours').style.display = "inline";
    document.getElementById('minutes').style.display = "inline";
    document.getElementById('seconds').style.display = "inline";
    document.getElementById('dhour').innerHTML = dhour;
    document.getElementById('dmin').innerHTML = dmin;
    document.getElementById('dsec').innerHTML = dsec;
    setTimeout("countdown()",500);
}

if (dhour < 2 || (dhour == 2 && dmin == 0 && dsec == 0))
{
    document.getElementById('dhour').style.color = "yellow";
    document.getElementById('dmin').style.color = "yellow";
    document.getElementById('dsec').style.color = "yellow";
}

if (dhour < 1 || (dhour == 1 && dmin == 0 && dsec == 0))
{
    document.getElementById('dhour').style.color = "red";
    document.getElementById('dmin').style.color = "red";
    document.getElementById('dsec').style.color = "red";
}
}

function checkTime(i)
{
if (i<10)
  {
  i="0" + i;
  }
return i;
}
</script>

var current=“测试”；
var startHour=0；
var startMinute=0；
var endHour=23；
var endMinute=55；
var tz=0；
var montharray=新数组（“一月”、“二月”、“三月”、“四月”、“五月”、“六月”、“七月”、“八月”、“九月”、“十月”、“十一月”、“十二月”）；
如果（startMinute<10）{startMinute=“0”+startMinute；}
函数倒计时（）
{
var today=新日期（）；
var today=today.getYear（）；
如果（今天<1000）
{今天+=1900；}
var todaym=today.getUTCMonth（）；
var todayd=today.getUTCDate（）；
var todayh=today.getUTCHours（）；
var todaymin=today.getUTCMinutes（）；
var todaysec=today.getUTCSeconds（）；
//在数字前面加一个零我能想到的第一个解决方案是，向客户端发送计时器将持续的秒数，而不是时间戳，但由于HTTP传输延迟，它可能不准确