gistfile1.js

var DateHelper = {
  timeAgoInWords: function(from) {
    return this.distanceOfTimeInWords(new Date(), from);
  },

  distanceOfTimeInWords: function(to, from) {
    var distance_in_seconds = ((to - from) / 1000);
    var distance_in_minutes = (distance_in_seconds / 60).floor();

    if (distance_in_minutes <= 0)      return "less than a minute";
    if (distance_in_minutes == 1)      return "a minute";
    if (distance_in_minutes < 45)      return distance_in_minutes + " minutes";
    if (distance_in_minutes < 90)      return "about 1 hour";
    if (distance_in_minutes < 1440)    return "about " + Math.round(distance_in_minutes / 60) + " hours";
    if (distance_in_minutes < 2880)    return "1 day";
    if (distance_in_minutes < 43200)   return Math.round(distance_in_minutes / 1440) + " days";
    if (distance_in_minutes < 86400)   return "about 1 month";
    if (distance_in_minutes < 525960)  return Math.round(distance_in_minutes / 43200) + " months";
    if (distance_in_minutes < 1051199) return "about 1 year";

    return "over " + (distance_in_minutes / 525960).floor() + " years";
  }
};