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

fun main() {
    // We'll start by getting the current time.
    val now = Instant.now()
    println(now)

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

    // You can extract the various components of the time
    // value as expected.
    println(then.year)
    println(then.month)
    println(then.dayOfMonth)
    println(then.hour)
    println(then.minute)
    println(then.second)
    println(then.nano)
    println(then.zone)

    // The Monday-Sunday DayOfWeek is also available.
    println(then.dayOfWeek)

    // These methods compare two times, testing if the
    // first occurs before, after, or at the same time
    // as the second, respectively.
    println(then.isBefore(ZonedDateTime.now()))
    println(then.isAfter(ZonedDateTime.now()))
    println(then.isEqual(ZonedDateTime.now()))

    // The Duration class represents the interval between two times.
    val diff = Duration.between(then.toInstant(), now)
    println(diff)

    // We can compute the length of the duration in
    // various units.
    println(diff.toHours())
    println(diff.toMinutes())
    println(diff.seconds)
    println(diff.nano)

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