Fecha y hora en Javascript

[skatomundo]

Yo utilizo esa la encuentro Simple, modificable Html

Código:

<div align="center"><font face="Arial, Helvetica, sans-serif" size="-3" color="#CC0000"><span id="clock">
<script language="JavaScript">
<!-- Begin
var dayarray=new Array("Domingo","Lunes","Martes","Miercoles","Jueves","Viernes","Sabado")
var montharray=new Array("Enero","Febrero","Marzo","Abril","Mayo","Junio","Julio","Agosto","Septiembre","Octubre","Noviembre","Diciembre")
function getthedate(){
var mydate=new Date()
var year=mydate.getYear()
if (year < 1000)
year+=1900
var day=mydate.getDay()
var month=mydate.getMonth()
var daym=mydate.getDate()
if (daym<10)
daym="0"+daym
var hours=mydate.getHours()
var minutes=mydate.getMinutes()
var seconds=mydate.getSeconds()
var dn="AM"
if (hours>=12)
dn="PM"
if (hours>12){
hours=hours-12
}
{
 d = new Date();
 Time24H = new Date();
 Time24H.setTime(d.getTime() + (d.getTimezoneOffset()*60000) + 3600000);
 InternetTime = Math.round((Time24H.getHours()*60+Time24H.getMinutes()) / 1.44);
 if (InternetTime < 10) InternetTime = '00'+InternetTime;
 else if (InternetTime < 100) InternetTime = '0'+InternetTime;
}
if (hours==0)
hours=12
if (minutes<=9)
minutes="0"+minutes
if (seconds<=9)
seconds="0"+seconds
//change font size here
var cdate=dayarray[day]+", "+daym+" "+montharray[month]+" "+year+"  -  "+hours+":"+minutes+":"+seconds+" "+dn+""
if (document.all)
document.all.clock.innerHTML=cdate
else if (document.getElementById)
document.getElementById("clock").innerHTML=cdate
else
document.write(cdate)
}
if (!document.all&&!document.getElementById)
getthedate()
function goforit(){
if (document.all||document.getElementById)
setInterval("getthedate()",1000)
}
window.onload=goforit
//  End -->
</script>
</span></font></div>