//createdAt and lastUpdatedAt are initialised like this:

    LocalDateTime createdAt = LocalDateTime.now(ZoneId.of("UTC"));
    LocalDateTime lastUpdatedAt = LocalDateTime.now(ZoneId.of("UTC"));

    //Rest of the code...

    System.out.println(rocReviewComment.getCreatedAt().toString() + ">>>" + rocReviewComment.getLastUpdatedAt().toString());
    // Initialize the database
    rocReviewCommentRepository.saveAndFlush(rocReviewComment);
    System.out.println(rocReviewComment.getCreatedAt().toString() + ">>>" + rocReviewComment.getLastUpdatedAt().toString());

第一次打印：2021-02-22t16:16:14.755>>>2021-02-22t16:16:14.762
第二次打印：2021-02-22t10:46:44.389>>>2021-02-22t10:46:44.389
你可以看到时间部分被改变了。