/* package whatever; // don't place package name! */
 
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.temporal.IsoFields;
import java.time.temporal.TemporalAdjusters;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	static DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("dd-MM-uu");
 
	public static void main (String[] args)
	{
		String str = "30-09-20";
		LocalDate date = LocalDate.parse(str, dateFormatter);
 
		// Is date the end of a quarter?
		if (date.get(IsoFields.DAY_OF_QUARTER) >= 90
				&& date.equals(date.with(TemporalAdjusters.lastDayOfMonth()))) {
			LocalDate endOfNextQuarter = date.plus(1, IsoFields.QUARTER_YEARS)
					.with(TemporalAdjusters.lastDayOfMonth());
			System.out.println("End of next quarter is: " + endOfNextQuarter);
			System.out.println("End of next quarter is: "
								+ endOfNextQuarter.format(dateFormatter));
		} else {
			throw new IllegalStateException(str + " is not a quarter end date");
		}
	}
}