web網頁時間同步本地時間

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<script type="text/javascript">

calendar = new Date();
day = calendar.getDay();
month = calendar.getMonth();
date = calendar.getDate();
year = calendar.getYear();
if (year> 100) year = 1900 + year;
cent = parseInt(year/100);
g = year % 19;
k = parseInt((cent - 17)/25);
i = (cent - parseInt(cent/4) - parseInt((cent - k)/3) + 19*g + 15) % 30;
i = i - parseInt(i/28)*(1 - parseInt(i/28)*parseInt(29/(i+1))*parseInt((21-g)/11));
j = (year + parseInt(year/4) + i + 2 - cent + parseInt(cent/4)) % 7;
l = i - j;
emonth = 3 + parseInt((l + 40)/44);
edate = l + 28 - 31*parseInt((emonth/4));
emonth--;
var dayname = new Array ("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六");
var monthname =
new Array ("1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月" );
document.write("目前時間："+year +"年 ");
document.write(monthname[month]);
document.write(date + "日"+" ");
document.write(dayname[day]+" ");
document.write("<span id=‘clock‘></span>");
var now,hours,minutes,seconds,timeValue;
function showtime(){
now = new Date();
hours = now.getHours();
minutes = now.getMinutes();
seconds = now.getSeconds();
timeValue = (hours >= 12) ? " 下午 " : " 上午 ";
timeValue += ((hours > 12) ? hours - 12 : hours) + "點";
timeValue += ((minutes <10)?"0":"") + minutes+"分";
timeValue += ((seconds <10)?"0":"") + seconds+"秒";
clock.innerHTML = timeValue;
setTimeout("showtime()",100);
}
showtime();
</script>

web網頁時間同步本地時間