java8 日期类库基本使用

java8 日期类库基本使用

1public static void main(String[] args) {
2        /**
3         * java 比较两个日期的差 年 月 日 等
4         */
5        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
6        LocalDate start_ = LocalDate.parse("1994-09-03", dateTimeFormatter);
7        LocalDateTime end_ = LocalDateTime.now();
8        long years = ChronoUnit.YEARS.between(start_, end_);
9        long days = ChronoUnit.DAYS.between(start_, end_);
10        System.out.println("年：" + years);
11        System.out.println("天：" + days);
12        //plus
13        LocalDateTime nextWeek = end_.plus(1L, ChronoUnit.WEEKS);//月 年 同理
14        System.out.println("一周后：" + nextWeek);
15
16        //minus
17        LocalDateTime preWeek = end_.minusWeeks(1);
18        System.out.println("上一周：" + preWeek);
19        LocalDateTime preDay = end_.minusDays(2);
20        System.out.println("前两天：" + preDay);
21    }