求javascript获得当前时间（年月日）的代码！

Question

<script language="javascript">function PageDate()
{
currentDate = new Date()
with (currentDate)
          {
day=getDay()
month=getMonth()+1
this.document.classname="sj"
this.document.write('北京时间 '+getFullYear()+'年'+month+'月'+getDate()+'日')
}
if (day==1){document.write(' 星期一')}
if (day==2){document.write(' 星期二')}
if (day==3){document.write(' 星期三')}
if (day==4){document.write(' 星期四')}
if (day==5){document.write(' 星期五')}
if (day==6){document.write(' 星期六')}
if (day==0){document.write(' 星期日')}
document.write('<br/>')
}PageDate()
</script>