public static void main(String[] args) {
// 今天
LocalDateTime now = LocalDateTime.now();
// 昨天
LocalDateTime yesterday = now.minusDays(1);
// 明天
LocalDateTime tomorrow = now.plusDays(1);
// 昨天在今天之前
System.out.println(yesterday.isBefore(now));
// 明天在今天之后
System.out.println(tomorrow.isAfter(now));
}