<BODY>
    <div ></div>
    <script>
        window.onload=function(){
            var ss=0;
        var mm=0;
        var hh=0;
        var str;
        var time=window.setInterval(function(){
            str="";
            if(++ss==60){
                if(++mm==60){
                    hh++;
                    mm=0;
                }
                ss=0;
            }

            str+=hh<10?"0"+hh:hh;
            str+=":";
            str+=mm<10?"0"+mm:mm;
            str+=":";
            str+=ss<10?"0"+ss:ss;
            document.getElementById("d").innerHTML=str;
        },1000);
        }
        
    </script>
 </BODY>

 

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