import java.time.*;

public class Main {

    public static void main(String[] args) {

        LocalDateTime departureAtBeijing = LocalDateTime.of(2019, 9, 15, 13, 0, 0);

        int hours = 13;

        int minutes = 20;

        LocalDateTime arrivalAtNewYork = calculateArrivalAtNY(departureAtBeijing, hours, minutes);

        System.out.println(departureAtBeijing + " -> " + arrivalAtNewYork);

        // test:

        if (!LocalDateTime.of(2019, 10, 15, 14, 20, 0)

                .equals(calculateArrivalAtNY(LocalDateTime.of(2019, 10, 15, 13, 0, 0), 13, 20))) {

            System.err.println("测试失败!");

        } else if (!LocalDateTime.of(2019, 11, 15, 13, 20, 0)

                .equals(calculateArrivalAtNY(LocalDateTime.of(2019, 11, 15, 13, 0, 0), 13, 20))) {

            System.err.println("测试失败!");

        }

    }

    static LocalDateTime calculateArrivalAtNY(LocalDateTime bj, int h, int m) {

        var ny = ZonedDateTime.of( bj,(ZoneId.of("Asia/Shanghai")));

        var ny2 = ny.withZoneSameInstant(ZoneId.of("America/New_York"));

        return ny2.toLocalDateTime().plusHours(h).plusMinutes(m);

    }

}