Here is the code:

        
  
Change number depending on how fast you want the colors to change     
// var myVar = setInterval(function(){ myTimer() }, 1000);

function myTimer() {
    var d = new Date();
    var t = d.toLocaleTimeString();
    document.getElementById("demo").innerHTML = t;
 }
// end of loop  

A script on this page starts this clock:

Stop time
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