readableTime.js

function convertToReadableTime(millis){
  var timeArray = [];

  var hundredths = findHundredths(millis);

  var x = Math.floor(millis / 1000);
  var seconds = Math.floor(x % 60);
  x /= 60;
  var minutes = Math.floor(x % 60);
  x /= 60;
  var hours = Math.floor(x % 24);
  x /= 24;
  var days = Math.floor(x);

  timeArray.push(hundredths, seconds, minutes, hours, days);

  var timeString = timeFormat(timeArray, 2);
  return timeString;
}

function findHundredths(millis){
  var secondsDecimal = millis / 1000;
  var x = String(secondsDecimal);
  var splitHundredths = x.split(".");
  var bajillionHundredths = splitHundredths[1];
  var newHundredths = bajillionHundredths.charAt(0) + bajillionHundredths.charAt(1);
  return newHundredths;
}

function timeFormat(array, targetLength){
  var formattedArray = [];
  for(var i = 0; i < array.length; i++){
    var output = array[i] + '';
    while (output.length < targetLength) {
        output = '0' + output;
    }
    formattedArray.push(output);
  }
  var finalTimeString = stringItTogether(formattedArray);
  return finalTimeString;
}

function stringItTogether(arrayOfTimes){
  var stringy = arrayOfTimes[4] + ":" + arrayOfTimes[3] + ":" + arrayOfTimes[2] + ":" + arrayOfTimes[1] + "." + arrayOfTimes[0]
  return stringy;
}