import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;

public class App {
    public static void main(String[] args) throws Exception {
        LocalDateTime now = LocalDateTime.now();
        System.out.println(now);
        System.out.println(now.toLocalDate());
        System.out.println(now.toLocalTime());

        LocalDateTime starDateTime = LocalDateTime.of(2020, 1, 1, 0, 0, 0);
        long days = ChronoUnit.DAYS.between(starDateTime, now);
        System.out.println(days);

        LocalDateTime endDateTime = LocalDateTime.of(2020, 1, 1, 0, 0, 0).plusDays(days);
        long hours = ChronoUnit.HOURS.between(starDateTime, endDateTime);
        System.out.println(hours);
        long minutes = ChronoUnit.MINUTES.between(starDateTime, endDateTime);
        System.out.println(minutes);
        long seconds = ChronoUnit.SECONDS.between(starDateTime, endDateTime);
        System.out.println(seconds);
    }
}