function timeClock(){
now =new Date();
now2 = new Date(now- 15 * 60 *60 * 1000);
now3 = new Date(now- 8 * 60 *60 * 1000);
min1=now.getMinutes();
min2=now2.getMinutes();
min3=now3.getMinutes();
if (now.getMinutes()<10){
min1="0"+now.getMinutes();
}
if (now2.getMinutes()<10){
min2="0"+now2.getMinutes();
}
if (now3.getMinutes()<10){
min3="0"+now3.getMinutes();
}
time3 =now.getHours()+":"+min1;
time1 =now2.getHours()+":"+min2;
time2 =now3.getHours()+":"+min3;
document.getElementById("US").innerHTML=time1;
document.getElementById("London").innerHTML=time2;
document.getElementById("Beijing").innerHTML=time3;
}
setInterval("timeClock()", 10000);