code: function convertToDates(tableColumn) {
    // Before converting to dates, we ignore values which would be replaced with null or zero.
    // Do this by replacing both sorts with null.
    var goodValues = replaceValues(
      tableColumn._values,
      [],
      tableColumn._replaceWithNullValues.concat(
        tableColumn._replaceWithZeroValues
      )
    );
    return TableColumn.convertToDates(goodValues, tableColumn.subtype);
  }
docs: Simple check to try to guess date format, based on max value of first position.
  If dates are consistent with US format, it will use US format (mm-dd-yyyy).
  
  @param  {TableColumn} tableColumn The column.
  @return {Object} Object with keys:
  subtype: The identified subtype, or undefined.
  jsDates: The values as javascript dates.
  julianDates: The values as JulianDates.