code: function finishFromIndex(timeColumn, index) {
    if (!defined(timeColumn.displayDuration)) {
      return timeColumn.finishJulianDates[index];
    } else {
      return JulianDate.addMinutes(
        timeColumn.julianDates[index],
        timeColumn.displayDuration,
        endScratch
      );
    }
  }
docs: Gets the finish time for the specified index.
  @private
  @param  {TableColumn} timeColumn The time column that applies to this data.
  @param  {Integer} index The index into the time column.
  @return {JulianDate} The finnish time that corresponds to the index.