Increment time from javascript

//Server time I am sending serverTimeP = 0.21023

function OnRunnTimer(timeP) { 
            setInterval(function () { runJSTimer(timeP); }, 1000);
        }

 function runJSTimer(serverTimeP) {

var d = new Date();
              
             d.setHours(serverTimeP);             
            
 
             var hours = d.getHours();
             var min = d.getMinutes();
             var sec = d.getSeconds();
 
             lblJsTimer.SetText(hours + ":" + min + ":" + sec);

}