DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
LocalDateTime d = LocalDateTime.parse("2021-03-04 00:00:00", dtf);
System.out.println(d.plusHours(-1).format(dtf));
2021-03-03 23:00:00
原文：https://www.cnblogs.com/smileblogs/p/14481517.html