code: function substituteTimeAgo(string, number, withoutSuffix, isFuture, lang) {
          var rt = lang.relativeTime[string];
          return (typeof rt === 'function') ?
              rt(number || 1, !!withoutSuffix, string, isFuture) :
              rt.replace(/%d/i, number || 1);
      }
docs: **********************************
  Relative Time
  ********************************** helper function for moment.fn.from, moment.fn.fromNow, and moment.duration.fn.humanize