docs: public static int getMonthLength(int year, int month) {
  
  		if ((month < 1) || (month > 12)) {
  			throw new IllegalArgumentException("Invalid month: " + month);
  		}
  		if (month == 2) {
  			return isLeapYear(year) ? 29 : 28;
  		}
  
  		return MONTH_LENGTH[month];
  	}