Java Data Type - 如何计算两个时区中日期时间之间的持续时间

import java.time.Duration;
import java.time.ZoneId;
import java.time.ZonedDateTime;

public class Main {
  public static void main(String[] argv) {
    ZonedDateTime here = ZonedDateTime.now(ZoneId.of("America/Los_Angeles"));
    ZonedDateTime gmtNewYear = ZonedDateTime.of(2014, 12, 31, 23, 59, 59, 0, ZoneId.of("Europe/London"));

    Duration d = Duration.between(here, gmtNewYear);
    System.out.println(d);
  }
}