JavaScript - Go from a time in ms to human-readable

formatTime.js

//go from a time in ms to human-readable
function formatTime(t){
  var hrs = Math.floor(t / (1000*60*60));
  t = t % (1000*60*60);
  var mins = Math.floor(t / (1000*60));
  t = t % (1000*60);
  var secs = Math.floor(t / 1000);
  t = padZeros((t % 1000).toString(), 3).substring(0, 2);
  return padZeros(mins, 2) + ":" + padZeros(secs, 2) + '.' + t;
}

function padZeros(n, len){
  var s = n.toString();
  while (s.length < len){
    s = '0' + s;
  }
  return s;
}

// copied from https://github.com/duckduckgo/zeroclickinfo-goodies/blob/5521881a99e0e912e076cfc50016bfb81a0bcc17/share/goodie/stopwatch/stopwatch.js#L27