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.
        Instant now = Instant.now();
        System.out.println(now);

        // You can create a ZonedDateTime by providing the year, month, day, etc.
        // ZonedDateTime is always associated with a 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 day of week 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.toInstant().isBefore(now));
        System.out.println(then.toInstant().isAfter(now));
        System.out.println(then.toInstant().equals(now));

        // The Duration class represents the interval between two instants.
        Duration diff = Duration.between(then.toInstant(), now);
        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 minus to move backwards by a duration.
        System.out.println(then.plus(diff));
        System.out.println(then.minus(diff));
    }
}