<form name="BM1">
<input type="text" name="MucVB">
</form>

<script language="javascript">
function HamThoiGian(){
var ThoiGian = new Date();
var Gio = ThoiGian.getHours();
var Phut = ThoiGian.getMinutes();
var Giay = ThoiGian.getSeconds();
if(Gio<10){
Gio="0"+Gio;}
if(Phut<10){
Phut="0"+Phut;}
if(Giay<10){
Giay="0"+Giay;}
document.BM1.MucVB.value="Hiện giờ là: "+Gio+":"+Phut+":"+Giay;
}
setInterval("HamThoiGian()",1000);
</script>