code: private int subParse(String text, int start, char ch, int count,
              boolean obeyCount, boolean allowNegative,
              boolean[] ambiguousYear, Calendar cal,
              MessageFormat numericLeapMonthFormatter, Output<TimeType> tzTimeType) {
          return subParse(text, start, ch, count, obeyCount, allowNegative, ambiguousYear, cal, null, null, null);
      }
docs: Overloading to provide default argument (null) for day period.