javascript中根据年月日显示星期几

在一个小工具网页中需要根据日期显示星期几，比较愚钝，不知道linux下的一些脚本如何处理，而且不希望改变原始数据，因此在展现时使用script简单处理。
<script language="javascript">
function GetWeek(year, month, day) {
var time1 = new Date(year, month, day);
var week = time1.getDay();
if (week == 0)
        week = "日";
else if (week == 1)
        week = "一";
else if (week == 2)
        week = "二";
else if (week == 3)
        week = "三";
else if (week == 4)
        week = "四ff";
else if (week == 5)
        week = "五";
else if (week == 6)
        week = "六";
return week;
}
</script>

<script language="javascript">
    document.write(GetWeek(2008,11,09));
</script>