Java Data Type - 如何将ZonedDateTime转换为日历

import java.time.ZonedDateTime;
import java.util.GregorianCalendar;

public class Main {
  public static void main(String[] args) {
    ZonedDateTime gregorianCalendarDateTime = new GregorianCalendar()
        .toZonedDateTime();

    GregorianCalendar gc = GregorianCalendar.from(gregorianCalendarDateTime);
    System.out.println(gc);
  }
}