给定目标地区时区，在js中求得时间

<script type="text/javascript" language="javascript"><!--
function calcTime(offset) {
    //create Date object for current location
    d = new Date();
    
    //convert to msec
    //add local time zone offset
    //get UTC time in msec
    utc = d.getTime() + (d.getTimezoneOffset() * 60000);
    
    //create new Date object for different city
    //using supplied offset
    nd = new Date(utc + (3600000*offset));
    return nd;

}
var offset_time = -8;//目标地区的时区
var year = 2012;
var month = 2;
var day = 8;
var hours = 18;
var minutes = 00;
var seconds=00;
var endStr = year+'/'+month+'/'+day+' '+hours+':'+minutes+':'+seconds;
var endDate=new Date(endStr);

var total_seconds = 0;
var now = calcTime(offset_time);
total_seconds=(endDate.getTime()-now.getTime())/1000;
total_seconds = Math.round(total_seconds);
setInterval('exe()',1000);

function exe(){
    if(total_seconds > 0){
        var hh = Math.floor(total_seconds/3600);
        var mm = Math.floor((Number(total_seconds)-Number(Number(hh)*3600))/60);

        var ss = Number(total_seconds)-Number(Number(hh)*3600)-Number(Number(mm)*60);
        if(hh < 10) hh='0'+hh;
        if(mm < 10) mm = '0'+mm;
        if(ss < 10) ss = '0'+ss;
        document.getElementByIdx_x('DDtime').innerHTML= hh+':'+mm+':'+ss;
        total_seconds--;
    }else{
        document.getElementByIdx_x('DDtime').innerHTML= '00:00:00';
    }
    
}

--></script>