date.js

function date_time(id){
	var D=new Date,
	year=D.getFullYear(),
	M=D.getMonth(),
	m=['January','February','March','April','May','June','July','August','September','October','November','December'],
	d=D.getDate(),
	W=D.getDay(),
	a='',
	w=['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'],
	h=D.getHours(),x=D.getMinutes(),s=D.getSeconds();
	if(h<10){h="0"+h;}
	if(x<10){x="0"+x;}
	if(s<10){s="0"+s;}
	if(d==1){a='st';}
	if(d==2){a='nd';}
	if(d==3){a='rd';}
	if(d>=4){a='th';}
	if(d==21){a='st';}
	if(d==22){a='nd';}
	if(d==23){a='rd';}
	if(d>=24){a='th';}
	if(d==31){a='st';}
	r=''+w[W]+' '+m[M]+' '+d+a+' '+year+' '+h+':'+x+':'+s;
	document.getElementById(id).innerHTML=r;
	setTimeout('date_time("'+id+'");','1000');
	return true;
}
window.onload=date_time('date_time');

/* To use this JavaScript, just add a DOM element and add the id parameter to it with the value date_time (<span id="date_time"></span>). */