import java.time.Instant;
import java.time.temporal.ChronoUnit;

public class Main {
	public static void main(String[] args) {
		Instant now = Instant.now();
		System.out.println("Now:       " + now);

		Instant yesterday = now.minus(1, ChronoUnit.DAYS);
		System.out.println("Yesterday: " + yesterday);
	}
}