import java.time.Instant;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

public class Main {
	public static void main(String[] args) {
		Executors.newScheduledThreadPool(1)
			.scheduleWithFixedDelay(
				() -> System.out.println(Instant.now()), 
				0, 
			    1,
			    TimeUnit.SECONDS
			);
	}
}