日期增加减少

LocalDate date = LocalDate.now();
LocalDate newDate = date.plus(-31, ChronoUnit.DAYS);
System.out.println("newDate=" + newDate);

LocalDateTime date=LocalDateTime.now();
LocalDateTime newDate = date.plus(-31, ChronoUnit.DAYS);
LocalDateTime newDate2 = newDate.plus(1, ChronoUnit.HOURS);