function get_time() {
  var date=new Date();
  var year="",month="",day="",week="",hour="",minute="",second="";
  year=date.getYear();
  month=add_zero(date.getMonth()+1);
  day=add_zero(date.getDate());
  week=date.getDay();
  switch (date.getDay()) {
    case 0:val="星期天";break;
    case 1:val="星期一";break;
    case 2:val="星期二";break;
    case 3:val="星期三";break;
    case 4:val="星期四";break;
    case 5:val="星期五";break;
    case 6:val="星期六";break;
  }
  hour=add_zero(date.getHours());
  minute=add_zero(date.getMinutes());
  second=add_zero(date.getSeconds());
  try {
    document.getElementById("timetable").innerText=year+"年"+month+"月"+day+"日 "+val+" "+hour+":"+minute+":"+second;
  }
  catch(e) {}
}

function add_zero(temp) {
  if(temp<10) return "0"+temp;
  else return temp;
}

setInterval("get_time();",1000);