显示当前时间JS

<script>var day="";
var month="";
var ampm="";
var ampmhour="";
var myweekday="";
var year="";
mydate=new Date();
myweekday=mydate.getDay();
mymonth=mydate.getMonth()+1;
myday= mydate.getDate();
myyear= mydate.getYear();
year=(myyear > 200) ? myyear : 1900 + myyear;
if(myweekday == 0)
weekday=" 星期日 ";
else if(myweekday == 1)
weekday=" 星期一 ";
else if(myweekday == 2)
weekday=" 星期二 ";
else if(myweekday == 3)
weekday=" 星期三 ";
else if(myweekday == 4)
weekday=" 星期四 ";
else if(myweekday == 5)
weekday=" 星期五 ";
else if(myweekday == 6)
weekday=" 星期六 ";
document.write(year+"年"+mymonth+"月"+myday+"日 "+weekday);
</script>

<SCRIPT language=Javascript1.2> 
<!--
//以下是顯示時間
var tags_before_clock = ""
var tags_after_clock = ""

if(navigator.appName == "Netscape") {
document.write('<layer id="clock"></layer>');
}

if (navigator.appVersion.indexOf("MSIE") != -1){
document.write('<span id="clock"></span>');
}

function showclock()
{ 
var date = new Date();
var hour = date.getHours();
var min = date.getMinutes(); 
var sec = date.getSeconds();
var col = ":";
var spc = "";
var apm;

if ( hour >12 ) 
{ 
apm="P.M.";
hour=hour-12;
}
else 
{
apm="A.M.";
}

if (hour == 0) hour=12;
if (min<=9) min="0"+min;
if (sec<=9) sec="0"+sec;

if(navigator.appName == "Netscape") 
{
document.clock.document.write(tags_before_clock
+hour+col+min+col+sec+spc+tags_after_clock);
document.clock.document.close();
}

if (navigator.appVersion.indexOf("MSIE") != -1)
{
clock.innerHTML = tags_before_clock+hour
+col+min+col+sec;
}
}

setInterval("showclock()",1000);
//-->
</SCRIPT>
 <script type="text/javascript">
   function clock(){
       var nowtime=new Date();
       var flag="";
       var hours=nowtime.getHours();
       if(hours>12){
           hours-=12;
           flag="";
       }
       hours=hours>9?hours:"0"+hours;
       var minutes=nowtime.getMinutes();
       minutes=minutes>9?minutes:"0"+minutes;
       var seconds=nowtime.getSeconds();
       seconds=seconds>9?seconds:"0"+seconds;
       var disptime=hours+":"+minutes+":"+seconds+""+flag;
       document.getElementById("clock").innerHTML=disptime;
       setTimeout("clock()",1000);
   }
 </script>
<script type="text/javascript">
clock();
</script>