Different java.time.ZonedDateTime formatted with pattern yyyy-MM-dd'T'HH:mm:ssXXX

TimeZoneTest.java

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;

public class TimeZoneTest {

    public static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ssXXX");


    public static void main(String[] args) {
        System.out.println("São Paulo: " + nowInSaoPaulo().format(formatter));
        System.out.println("China: " + nowInShangai().format(formatter));
        System.out.println("UTC: " + nowInUTC().format(formatter));
    }

    public static ZonedDateTime nowInSaoPaulo() {
        ZoneId zoneId = ZoneId.of("America/Sao_Paulo");
        System.out.println("São Paulo ZoneId: " + zoneId);
        ZonedDateTime agoraSaoPaulo = ZonedDateTime.of(LocalDateTime.now(), zoneId);
        return agoraSaoPaulo;
    }

    public static ZonedDateTime nowInShangai() {
        ZoneId zoneId = ZoneId.of("Asia/Shanghai");
        System.out.println("Shangai ZoneId: " + zoneId);
        ZonedDateTime agoraSaoPaulo = ZonedDateTime.of(LocalDateTime.now(), zoneId);
        return agoraSaoPaulo;
    }

    public static ZonedDateTime nowInUTC() {
        ZoneId zoneId = ZoneId.of("UTC");
        System.out.println("Shangai ZoneId: " + zoneId);
        ZonedDateTime agoraSaoPaulo = ZonedDateTime.of(LocalDateTime.now(), zoneId);
        return agoraSaoPaulo;
    }

}