window.onload=function(){
    setInterval("mytime()",1000);
}
function mytime(){
     document.getElementById("time").innerHTML = fmtDate(new Date());
}
function fmtDate(obj){
    var date =  new Date(obj);
    var y = 1900+date.getYear();
    var m = "0"+(date.getMonth()+1);
    var d = "0"+date.getDate();
    
 
var h = "0"+date.getHours();
       var min = "0"+date.getMinutes();
    var s = "0"+date.getSeconds();
    return y+"年-"+m.substring(m.length-2,m.length)+"月-"+d.substring(d.length-2,d.length)+"日-"+h.substring(h.length-2,h.length)+"時-"+min.substring(min.length-2,min.length)+"分-"+s.substring(s.length-2,s.length)+‘秒‘;
}
 

js時間轉換