var r = document.getElementById("r"); var r2 = document.getElementById("r2"); var nTime = (new Date().getTime()).toString().slice(0, 10); var rTime; var i = 0; setInterval(function(){ r.innerHTML = ++i; rTime = (new Date().getTime()).toString().slice(0, 10); r2.innerHTML = rTime - nTime; }, 1000);