import java.time.*;
import java.time.temporal.ChronoUnit;

public class TimeExample {
    public static void main(String[] args) {
        // We'll start by getting the current time.
        LocalDateTime now = LocalDateTime.now();
        System.out.println(now);

        // You can create a ZonedDateTime by providing the 
        // year, month, day, etc. Times are always associated
        // with a ZoneId, i.e. time zone.
        ZonedDateTime then = ZonedDateTime.of(2009, 11, 17, 20, 34, 58, 651387237, ZoneId.of("UTC"));
        System.out.println(then);

        // You can extract the various components of the time
        // value as expected.
        System.out.println(then.getYear());
        System.out.println(then.getMonth());
        System.out.println(then.getDayOfMonth());
        System.out.println(then.getHour());
        System.out.println(then.getMinute());
        System.out.println(then.getSecond());
        System.out.println(then.getNano());
        System.out.println(then.getZone());

        // The Monday-Sunday DayOfWeek is also available.
        System.out.println(then.getDayOfWeek());

        // These methods compare two times, testing if the
        // first occurs before, after, or at the same time
        // as the second, respectively.
        System.out.println(then.isBefore(now.atZone(ZoneId.of("UTC"))));
        System.out.println(then.isAfter(now.atZone(ZoneId.of("UTC"))));
        System.out.println(then.isEqual(now.atZone(ZoneId.of("UTC"))));

        // The Duration class represents the interval between two times.
        Duration diff = Duration.between(then, now.atZone(ZoneId.of("UTC")));
        System.out.println(diff);

        // We can compute the length of the duration in
        // various units.
        System.out.println(diff.toHours());
        System.out.println(diff.toMinutes());
        System.out.println(diff.getSeconds());
        System.out.println(diff.toNanos());

        // You can use plus to advance a time by a given
        // duration, or with a minus to move backwards by a
        // duration.
        System.out.println(then.plus(diff));
        System.out.println(then.minus(diff));
    }
}