Java时区计算从旧金山到东京的航班到达时间

import java.io.PrintStream;

import java.time.LocalDateTime;
/*来自 
 时代Java公众号 - nowjava.com*/

import java.time.ZonedDateTime;

import java.time.Month;

import java.time.ZoneId;

import java.time.temporal.ChronoUnit;

import java.time.DateTimeException;

import java.time.format.DateTimeFormatter;


/*

 * This example uses ZonedDateTime to calculate the arrival time of

 * a flight that leaves from San Francisco and arrives in Tokyo.

 * The flight is 10 hours, 50 minutes long. Formatters are used to

 * print the departure and arrival times.

 */


public class Flight {

    public static void main(String[] args) {

        DateTimeFormatter format = DateTimeFormatter

                .ofPattern("MMM d yyyy  hh:mm a");


        // Leaving from San Francisco on July 20, 2013, at 7:30 p.m.

        LocalDateTime leaving = LocalDateTime.of(2013, Month.JULY, 20, 19,
        /*
         from n  o  w  j  a  v  a . c o m 
        */

                30);

        ZoneId leavingZone = ZoneId.of("America/Los_Angeles");

        ZonedDateTime departure = ZonedDateTime.of(leaving, leavingZone);


        try {

            String out1 = departure.format(format);

            System.out.printf("LEAVING:  %s (%s)%n", out1, leavingZone);

        } catch (DateTimeException exc) {

            System.out.printf("%s can't be formatted!%n", departure);

            throw exc;

        }


        // Flight is 10 hours and 50 minutes, or 650 minutes

        ZoneId arrivingZone = ZoneId.of("Asia/Tokyo");

        ZonedDateTime arrival = departure.withZoneSameInstant(arrivingZone)

                .plusMinutes(650);


        try {

            String out2 = arrival.format(format);

            System.out.printf("ARRIVING: %s (%s)%n", out2, arrivingZone);

        } catch (DateTimeException exc) {

            System.out.printf("%s can't be formatted!%n", arrival);

            throw exc;

        }


        if (arrivingZone.getRules().isDaylightSavings(arrival.toInstant()))

            System.out.printf(

                    "  (%s daylight saving time will be in effect.)%n",

                    arrivingZone);

        else

            System.out.printf("  (%s standard time will be in effect.)%n",

                    arrivingZone);

    }

}