用LocalDateTime处理日期

DataHandlerJava8.java

public static void main(String[] args){

        //获得当前日期 2016-10-09T13:15:16.386
        LocalDateTime now = LocalDateTime.now();
        System.out.println("now = " + now);

        //获得3天后 2016-10-12T13:21:01.215
        LocalDateTime threeDaysAfterNow = now.plusDays(3);
        System.out.println("threeDaysAfterNow = " + threeDaysAfterNow);

        //获得3天后的23:59:59  2016-10-12T13:16:42.377
        LocalDateTime newTime = now.plusDays(3).withHour(23).withMinute(59).withSecond(59);
        System.out.println("newTime = " + newTime);

        //获得指定时间 2016-10-21T23:59:59
        LocalDateTime specificTime = LocalDateTime.of(2016, 10, 21, 23, 59, 59);
        System.out.println("specificTime = " + specificTime);

        //解析日期字符串
        LocalDateTime time1 = LocalDateTime.parse("2016-12-03T10:15:30.001");
        System.out.println("time1 = " + time1);
        LocalDateTime time2 = LocalDateTime.parse("2015-10-09T13:25:25");

        //比较日期 result > 0 |= 0| < 0
        int result = time1.compareTo(time2);
        System.out.println("result = " + result);

        //一个月后
        LocalDateTime oneMonthAfter = now.plusMonths(1);
        System.out.println("oneMonthAfter = " + oneMonthAfter);

        //LocalDateTime转换成Timestamp类型 2016-12-03 10:15:30.001
        Timestamp timestamp = Timestamp.valueOf(now);
        System.out.println("timestamp = " + timestamp);

        //LocalDateTime转换成字符串 2016-12-03T10:15:30.001
        String nowString = now.toString();
        System.out.println("nowString = " + nowString);


        //LocalDateTime转换成Date Sun Oct 09 13:42:40 CST 2016
        Date nowDate = Date.from(now.atZone(ZoneId.systemDefault()).toInstant());
        System.out.println("nowDate = " + nowDate);

        //Date转换成LocalDateTime 2016-10-09T14:07:48.651
        LocalDateTime nowLocalDateTime = LocalDateTime.ofInstant(nowDate.toInstant(), ZoneId.systemDefault());
        System.out.println("nowLocalDateTime = " + nowLocalDateTime);




    }