天气：阴 风力：微风

Java时间处理
Java8 time包

public class TimeUtil {

    public static void main(String[] args) {
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
        long currentTImeMillis = System.currentTimeMillis();
        System.out.println(currentTImeMillis); //当地时间戳  1527433077277
        System.out.println(df.format(new Date(currentTImeMillis)));//2018-05-27 22:57:57:277
        System.out.println(df.format(new Date(currentTImeMillis / 1000 * 1000)));//2018-05-27 22:57:57:000
        System.out.println(System.nanoTime()); //虚拟机时间有误差一般用于计算时间间隔

        System.out.println(Instant.now());//2018-05-27T14:57:57.281Z
        System.out.println(LocalDateTime.now());//2018-05-27T22:57:57.386
        System.out.println(LocalDate.now());//2018-05-27
        String localTime = String.valueOf(LocalTime.now());
        System.out.println(localTime.substring(0, localTime.length() - 4));//22:57:57
        System.out.println(LocalTime.now());//22:57:57.386
        System.out.println(LocalTime.now().getHour());//22
        System.out.println(LocalTime.now().getMinute());//57
        System.out.println(LocalTime.now().getSecond());//57

        LocalTime localTime1 = LocalTime.of(23, 12, 12);
        System.out.println(localTime1.plusHours(2));//01:12:12

        LocalDate localDate = LocalDate.of(2018, 5, 27);
        System.out.println(localDate.plusDays(10));//2018-06-06
        System.out.println(LocalDate.now().equals(localDate));//true

        LocalDate localDate1 = LocalDate.of(2018, 6, 28);
        System.out.println(LocalDate.now().compareTo(localDate1));//-1
        System.out.println(localDate1.plus(1, ChronoUnit.WEEKS));//2018-07-05
        System.out.println(localDate1.plus(1, ChronoUnit.DAYS));//2018-06-29
    }
}

• 未完待续