afterEffectsTimer.js

timer.js

Heavily modified code from: http://forums.creativecow.net/thread/227/12722 

timeToStart = 4; 
text.sourceText = "4:59";
if (time >= timeToStart){
 clockStart = 300;

 function padZero(n){
  if (n < 10) return "0" + n else return "" + n
 }
 
 clockTime = Math.max(clockStart -1 *(time - inPoint),0);
 
 t = Math.floor(clockTime)+timeToStart;
 min = Math.floor((t%3600)/60);
 sec = Math.floor(t%60);
 min + ":" + padZero(sec)
}