code: public LocalDate getLocalDate(final String column) {
      int index = _headerDefinition.columnIndex(column);
      return getLocalDate(index);
    }
docs: Returns an entry from a given column name as a LocalDate (possibly null). Throws an IllegalArgumentException if the name is not defined
  in the header definition. Throws a DateTimeParseException if the underlying data is not a date in ISO local date format (YYYY-MM-DD).
  
  @param column the column name of the entry, not null
  @return the entry, can be null if the value is null or empty