EXPRESION

rate = 1;
clockStart = 0;

function padZero(n){
if (n < 10) return "0" + n else return "" + n
}

clockTime = Math.max(clockStart + rate*(time - inPoint),0);

t = Math.floor(clockTime);
min = Math.floor((t%3600)/60);
sec = Math.floor(t%60);
min + ":" + padZero(sec)