正确代码如下：

<script language="JavaScript">

<!--

calendar = new Date();

day = calendar.getDay();

month = calendar.getMonth();

date = calendar.getDate();

year = calendar.getFullYear();

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("<font color=000000>"+year +"年");

document.write(monthname[month]);

document.write(date + "日"+" ");

document.write(dayname[day]+" "+"</font>");

// January(1月份节日，以下同。)

document.write("</font>");

//-->

</script>

<script language="JavaScript">

<!--

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) + " 点 ";

timeValue += ((minutes <10)?"0":"") + minutes+" 分 ";

timeValue += ((seconds <10)?"0":"") + seconds+" 秒 ";

clock.innerHTML = timeValue;

setTimeout("showtime()",100);

}

showtime();

//-->

</script>

修改过程：getYear改成getFullYear。

以上修改由Hongsen提供建议。