import java.time.Instant;
import java.time.ZoneId;
import java.time.zone.ZoneRules;

public class Main {
	public static void main(String[] args) {
		Instant now = Instant.now();
		ZoneRules zoneRules = ZoneId.of("Europe/London").getRules();

		System.out.println(zoneRules.nextTransition(now));

		System.out.println(zoneRules.previousTransition(now));
	}
}