int getDaysInMonthMax(long instant) {
        int thisYear = getYear(instant);
        int thisMonth = getMonthOfYear(instant, thisYear);
        return getDaysInYearMonth(thisYear, thisMonth);
    }
int getDaysInMonthMax ( long instant ) { int thisYear = getYear ( instant ) ; int thisMonth = getMonthOfYear ( instant , thisYear ) ; return getDaysInYearMonth ( thisYear , thisMonth ) ; }
Gets the maximum number of days in the month specified by the instant.

@param instant  millis from 1970-01-01T00:00:00Z
@return the maximum number of days in the month