java8时间新特性

public class LocalDateDemo {
    public static void main(String[] args) {
        LocalDate today = LocalDate.now();
        System.out.println("今天的日期:"+today);
        //一周后的日期
        LocalDate nextWeek = today.plus(1, ChronoUnit.WEEKS);
        System.out.println("一周后的日期为:"+nextWeek);
        //一年前的日期
        LocalDate previousYear = today.minus(1, ChronoUnit.YEARS);
        System.out.println("一年前的日期 : " + previousYear);
        //一年后的日期
        LocalDate nextYear = today.plus(1, ChronoUnit.YEARS);
        System.out.println("一年后的日期:"+nextYear);
        int year = today.getYear();
        int month = today.getMonthValue();
        int day = today.getDayOfMonth();

        System.out.println("year:"+year);
        System.out.println("month:"+month);
        System.out.println("day:"+day);
        //获取当前时间
        LocalTime time = LocalTime.now();
        System.out.println("当前时间为 ："+time);
        LocalTime newTime = time.plusHours(3);
        System.out.println("三个小时后的时间为:"+newTime);

        //Java判断日期是早于还是晚于另一个日期
        LocalDate tomorrow = LocalDate.of(2020,2,7);
        if(tomorrow.isAfter(today)){
            System.out.println("之后的日期:"+tomorrow);
        }
        LocalDate yesterday = today.minus(1, ChronoUnit.DAYS);
        if(yesterday.isBefore(today)){
            System.out.println("之前的日期:"+yesterday);
        }
        //在Java 8中检查闰年
        if(today.isLeapYear()){
            System.out.println("This year is Leap year");
        }else {
            System.out.println("This year is not a Leap year");
        }
        //获取当前的时间戳
        Instant timestamp = Instant.now();
        System.out.println("What is value of this instant " + timestamp.toEpochMilli());
        //使用预定义的格式化工具去解析或格式化日期
        String dayAfterTommorrow = "20200206";
        LocalDate formatted = LocalDate.parse(dayAfterTommorrow,
                DateTimeFormatter.BASIC_ISO_DATE);
        System.out.println(dayAfterTommorrow+"  格式化后的日期为:  "+formatted);
        //字符串互转日期类型
        LocalDateTime date = LocalDateTime.now();
        DateTimeFormatter format1 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        //日期转字符串
        String str = date.format(format1);
        System.out.println("日期转换为字符串:"+str);
        DateTimeFormatter format2 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        //字符串转日期
        LocalDate date2 = LocalDate.parse(str,format2);
        System.out.println("日期类型:"+date2);
    }
}