function startTime(){
	var today=new Date()
	var hBeijing=today.getHours()
	var hTokyo=today.getHours()+1
	var hChicago=today.getHours()+10
	var hLondon=today.getHours()+16
	var hNewyork=today.getHours()+11
	
	var m=today.getMinutes()
	var s=today.getSeconds()
	// add a zero in front of numbers<10
	m=checkTime(m)
	s=checkTime(s)
	hLondon=checkHour(hLondon,hBeijing)
	hTokyo=checkHour(hTokyo,hBeijing)
	hChicago=checkHour(hChicago,hBeijing)
	hNewyork=checkHour(hNewyork,hBeijing)
	
	document.getElementById('hBeijing').innerHTML=hBeijing+":"+m+":"+s
	document.getElementById('hTokyo').innerHTML=hTokyo+":"+m+":"+s
	document.getElementById('hChicago').innerHTML=hChicago+":"+m+":"+s
	document.getElementById('hLondon').innerHTML=hLondon+":"+m+":"+s
	document.getElementById('hNewyork').innerHTML=hNewyork+":"+m+":"+s
	t=setTimeout('startTime()',500)
}

function checkTime(i){
	if (i<10) 
	{i="0" + i}
	return i
}
function checkHour(j,k){
	if(j>24){
		j=j-"24"}
	return j
	}