TimeZonesExample.java

package com.kiroule.ocpupgradejava8.topic8_2;

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;

/**
 * @author Igor Baiborodine
 */
public class TimeZonesExample {

  public static void main(String... args) {

    LocalDateTime nowDateTime = LocalDateTime.now();

    ZoneId montrealZone = ZoneId.of("America/Montreal");
    ZonedDateTime montrealZonedDateTime = ZonedDateTime.of(nowDateTime, montrealZone);
    System.out.printf("Montreal-zoned now date/time: %s %n", montrealZonedDateTime);

    ZoneId moscowZone = ZoneId.of("Europe/Moscow");
    ZonedDateTime moscowZonedDateTime = montrealZonedDateTime.withZoneSameInstant(moscowZone);
    System.out.printf("Moscow-zoned now date/time: %s %n", moscowZonedDateTime);

    // Typically the amount is zero during winter and one hour during summer.
    System.out.printf("Current daylight savings offset for [%s]: %s %n",
                      moscowZone, moscowZone.getRules().getDaylightSavings(Instant.now()));

  }
}