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$starttime = strtotime($starttimestr);
$endtime = strtotime($endtimestr);
$lefttime = $endtime-$starttime; //实际剩下的时间（秒）
?>
<script language="JavaScript">
var overDate = <?php echo $lefttime;?>*1000;//截止时间
var NowTime = new Date();
var EndTime= new Date(NowTime.getTime() + overDate);

setInterval("GetRTime()",100);
</script>
</head>

</body>
</html>

==============================

$starttime = strtotime($starttimestr);
$endtime = strtotime($endtimestr);
$nowtime = time();
echo "活动还没开始,活动时间是：".$starttimestr."至".$endtimestr;
$lefttime = $endtime-$nowtime; //实际剩下的时间（秒）
?>
<script language="JavaScript">
//var overDate = 1000 * 60 * 60 * 24 * 3;//截止时间:为当前计算机时间+3天
var overDate = <?php echo $lefttime;?>*1000;//截止时间
var NowTime = new Date();
//var EndTime= new Date(2009,01,11,0,0);
var EndTime= new Date(NowTime.getTime() + overDate);
var EndTimeMsg = EndTime.getFullYear() + "年";
EndTimeMsg = EndTimeMsg + (EndTime.getMonth()+1) + "月";
EndTimeMsg = EndTimeMsg + (EndTime.getDate()) + "日";
EndTimeMsg = EndTimeMsg + (EndTime.getHours()) + "时";
EndTimeMsg = EndTimeMsg + (EndTime.getMinutes()) + "分";
EndTimeMsg = EndTimeMsg + (EndTime.getSeconds()) + "秒";
function GetRTime(){
NowTime = new Date();
var nMS=EndTime.getTime() - NowTime.getTime();
var nD=Math.floor(nMS/(1000 * 60 * 60 * 24));
var nH=Math.floor(nMS/(1000*60*60)) % 24;
var nM=Math.floor(nMS/(1000*60)) % 60;
var nS=Math.floor(nMS/1000) % 60;
var nMS=Math.floor(nMS/100) % 10;
if(nD>= 0){
document.getElementById("RemainD").innerHTML=nD;
document.getElementById("RemainH").innerHTML=nH;
document.getElementById("RemainM").innerHTML=nM;
document.getElementById("RemainS").innerHTML=nS + "." + nMS;
}
else {
document.getElementById("CountMsg").innerHTML=　EndTimeMsg +"已过！";
}
setTimeout("GetRTime()",100);
}
window.onload=function(){
document.getElementById("EndTimeMsg").innerHTML = EndTimeMsg;
GetRTime();
}
</script>
</head>

<hr />

=====================================================================================

<?php
//php的时间是以秒算。js的时间以毫秒算
date_default_timezone_set("Asia/Hong_Kong");//地区
//配置每天的活动时间段
$starttimestr = "2010-12-5 09:00:00";
$endtimestr = "2010-12-5 09:00:12";

$starttime = strtotime($starttimestr);
$endtime = strtotime($endtimestr);
$lefttime = $endtime-$starttime; //实际剩下的时间（秒）
?>

=====================================================================================

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Jquery实现倒计时效果</title>
<script language="javascript" src="/js/jquery-1.4.2.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
SysSecond=11000;
InterValObj=window.setInterval(SetRemainTime,100);
});
function SetRemainTime(){
if(SysSecond>0){
  SysSecond=SysSecond-100;
  var hour=Math.floor(SysSecond/(1000*60*60));
  var minite=Math.floor(SysSecond/(1000*60))%60;
  var second=Math.floor(SysSecond/1000)%60;
  var milliSecond=Math.floor(SysSecond/100)%10;
  if(hour<10)hour="0"+hour;if(minite<10)minite="0"+minite;if(second<10)second="0"+second;
  if(hour==0 && minite==0 && second<10){
   $("#remainTime").html(hour+":"+minite+":"+second+":"+milliSecond);
  }else{
   $("#remainTime").html(hour+":"+minite+":"+second);
  }
}else{
  $("#remainTime").html("00:00:00");
  window.clearInterval(InterValObj);
}
}
</script>
</head>

=====================================================================================

//代理,接单的时间+1小时减去当前时间的秒数
function SetRemainTime(){
if (SysSecond > 0) {
//alert(SysSecond);
SysSecond = SysSecond - 1;
var second = Math.floor(SysSecond % 60);             // 计算秒
var minite = Math.floor((SysSecond / 60) % 60);      //计算分
var hour = Math.floor((SysSecond / 3600) % 24);      //计算小时
var day = Math.floor((SysSecond / 3600) / 24);        //计算天

$("#remainTime").html(day + "天" + hour + "小时" + minite + "分" + second + "秒");
}else{//剩余时间小于或等于0的时候，就停止间隔函数
  window.clearInterval(InterValObj);
}
}
</script>