如何将Firestore时间戳转换为Java LocalDate？

import java.time.Instant;
import java.time.LocalDate;
import java.time.ZoneId;
import java.time.ZonedDateTime;

public class FirestoreTimestampConverter {
    public static LocalDate convertFirestoreTimestamp(long timestamp) {
        Instant instant = Instant.ofEpochMilli(timestamp);
        ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(instant, ZoneId.systemDefault());
        return zonedDateTime.toLocalDate();
    }

    public static void main(String[] args) {
        long firestoreTimestamp = 1634567890000L; // 假设这是Firestore时间戳的值
        LocalDate localDate = convertFirestoreTimestamp(firestoreTimestamp);
        System.out.println(localDate);
    }
}