tomTime);

  // Create a timeline displaying in UTC
  var timelineUTC = new vis.Timeline(document.getElementById('utc'), items, {
    editable: true,
    start: start,
    end: end,
    moment: function (date) {
      return vis.moment(date).utc();
    }
  });
  timelineUTC.addCustomTime(customTime);

  // Create a timeline displaying in UTC +08:00
  var timelinePlus8 = new vis.Timeline(document.getElementById('plus8'), items, {
    editable: true,
    start: start,
    end: end,
    moment: function (date)