gistfile1.txt

Date.prototype.toRelativeTime = function(date) {
  var delta = date - this, units, conversions;

  conversions = {
    millisecond: 1, // ms    -> ms
    second: 1000,   // ms    -> sec
    minute: 60,     // sec   -> min
    hour:   60,     // min   -> hour
    day:    24,     // hour  -> day
    month:  30,     // day   -> month (roughly)
    year:   12      // month -> year
  };

  for (var key in conversions) {
    if (delta < conversions[key]) {
      break;
    } else {
      units = key;
      delta = delta / conversions[key];
    }
  }

  if (units === 'second') return 'less than a minute';
  delta = Math.floor(delta);
  if (delta !== 1) { units += "s"; }
  return [delta, units].join(" ");
};