boilerplate.js/Boilerplate/src/js/components/date/diffForHumans.js

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/**
 * The difference between now and a prior or an
 * upcoming event, returned as readable text for humans.
 * 
 * 
 * @param {Number} unixTime milliseconds that have elapsed since 
 *                          00:00:00 Thursday, 1 January 1970
 * @param {boolean} ms set true if unixTime is not in milliseconds
 * @return {String}
 */
components('date.diffForHumans', (unixTime, ms) => {
  
    // Adjust for milliseconds
    ms = ms || false;
    if (typeof unixTime === 'string') unixTime = new Date(unixTime).getTime();
    if (!unixTime) unixTime = new Date().getTime() - 100;
    unixTime = (ms) ? unixTime * 1000 : unixTime;
  
    var d = new Date();
    var diff = Math.abs(d.getTime() - unixTime);
    var intervals = {
      y: diff / (365 * 24 * 60 * 60 * 1 * 1000),
      m: diff / (30.5 * 24 * 60 * 60 * 1 * 1000),
      d: diff / (24 * 60 * 60 * 1 * 1000),
      h: diff / (60 * 60 * 1 * 1000),
      i: diff / (60 * 1 * 1000),
      s: diff / (1 * 1000),
    };
  
    Object.keys(intervals).map(function(value, index) {
      return intervals[value] = Math.floor(intervals[value]);
    });
  
    var unit;
    var count;
  
    switch (true) {
      case intervals.y > 0:
        count = intervals.y;
        unit = 'year';
        break;
      case intervals.m > 0:
        count = intervals.m;
        unit = 'month';
        break;
      case intervals.d > 0:
        count = intervals.d;
        unit = 'day';
        break;
      case intervals.h > 0:
        count = intervals.h;
        unit = 'hour';
        break;
      case intervals.i > 0:
        count = intervals.i;
        unit = 'minute';
        break;
      default:
        count = intervals.s;
        unit = 'second';
        break;
  
    }
  
    if(count > 1) {
      unit = unit + 's';
    }
  
    if(count === 0) {
      return 'now';
    }
  
    return count + ' ' + unit + ((unixTime > d.getTime()) ? ' from now' : ' ago');

  });