public DateTimeFormatterBuilder appendChronologyText(TextStyle textStyle){
  Objects.requireNonNull(textStyle,"textStyle");
  appendInternal(new ChronoPrinterParser(textStyle));
  return this;
}

public DateTimeFormatterBuilder appendChronologyText ( TextStyle textStyle ) { Objects . requireNonNull ( textStyle , "textStyle" ) ; appendInternal ( new ChronoPrinterParser ( textStyle ) ) ; return this ; }
appends the chronology name to the formatter . < p > the calendar system name will be output during a format . if the chronology cannot be obtained then an exception will be thrown .
