function startTime()
{var d=new Date()
var h=d.getHours()
var m=d.getMinutes()
var s=d.getSeconds()
// add a zero in front of numbers<10
h=checkTime(h)

m=checkTime(m)
s=checkTime(s)
document.getElementById('txt').innerHTML=d.getFullYear()+"年"+(d.getMonth()+1)+"月"+d.getDate()+"日"+h+":"+m+":"+s
t=setTimeout('startTime()',500)
}

function checkTime(i)
{
if (i<10) 
  {i="0"+i}
  return i
}