jdk8的datetime時間函數使用示例

JDK8已發布，寫了一個datetime時間函數使用方法的小示例

複製代碼代碼如下:

package datetime;

import static java.time.temporal.TemporalAdjusters.lastDayOfMonth;

import static java.time.temporal.TemporalAdjusters.previousOrSame;

import java.time.DayOfWeek;

import java.time.Duration;

import java.time.LocalDate;

import java.time.LocalDateTime;

import java.time.LocalTime;

import java.time.Month;

import java.time.OffsetTime;

import java.time.Period;

import java.time.ZoneId;

import java.time.ZoneOffset;

import java.time.ZonedDateTime;

import java.time.temporal.ChronoUnit;

public class DataTimes {

public static void main(String[] args) {

// 創建時間對象

LocalDateTime timePoint = LocalDateTime.now(); // 當前時間

System.out.println("--當前時間----");

System.out.println(timePoint);

System.out.println("");

System.out.println("--自定義時間----");

System.out.println(LocalDate.of(2012, Month.DECEMBER, 12)); // from

// values

System.out.println(LocalDate.ofEpochDay(150)); // middle of 1970

System.out.println(LocalTime.of(17, 18)); // the train I took home today

System.out.println(LocalTime.parse("10:15:30")); // From a String

System.out.println("");

System.out.println("--獲取時間的各個部分----");

System.out.println(timePoint.toLocalDate());

System.out.println(timePoint.getMonth());

System.out.println(timePoint.getDayOfMonth());

System.out.println(timePoint.getSecond());

System.out.println("");

System.out.println("---設置並返回新的時間對象---");

LocalDateTime thePast = timePoint.withDayOfMonth(10).withYear(2010);

System.out.println(thePast);

System.out.println("---再加3週---");

LocalDateTime yetAnother = thePast.plusWeeks(3).plus(3,

ChronoUnit.WEEKS);

System.out.println(yetAnother);

System.out.println("");

System.out.println("---使用時間調整函數---");

System.out.println(timePoint);

System.out.println(timePoint.with(lastDayOfMonth()));

System.out.println(timePoint.with(previousOrSame(DayOfWeek.WEDNESDAY)));

System.out.println(timePoint.with(LocalTime.now()));

System.out.println("");

System.out.println("---截斷時間精確位--");

System.out.println(timePoint);

LocalDateTime truncatedTimeToMinutes = timePoint

.truncatedTo(ChronoUnit.MINUTES);

System.out.println(truncatedTimeToMinutes);

LocalDateTime truncatedTimeToSeconds = timePoint

.truncatedTo(ChronoUnit.SECONDS);

System.out.println(truncatedTimeToSeconds);

System.out.println("");

System.out.println("---使用時區---");

ZonedDateTime zoned_now = ZonedDateTime.of(LocalDateTime.now(),

ZoneId.of("UTC+08:00"));

System.out

.println(zoned_now.withZoneSameInstant(ZoneId.of("UTC+00:00")));

System.out.println(zoned_now.getOffset());

System.out.println("");

System.out.println("---時間上使用時區偏移---");

OffsetTime time = OffsetTime.now();

ZoneOffset offset = ZoneOffset.of("+02:00");

System.out.println(time);

System.out.println(time.withOffsetSameInstant(offset));

System.out.println("");

System.out.println("---時間加減---");

timePoint = LocalDateTime.now();

System.out.println(timePoint);

// 3 years, 2 months, 1 day

Period period1 = Period.of(3, 2, 1);

System.out.println(timePoint.plus(period1));

Duration duration = Duration.ofSeconds(3, 5);

System.out.println(timePoint.plus(duration));

Duration sixHours = Duration.between(

ZonedDateTime.of(LocalDateTime.now(), ZoneId.of("UTC+08:00")),

ZonedDateTime.of(LocalDateTime.now(), ZoneId.of("UTC+02:00")));

System.out.println(timePoint.plus(sixHours));

System.out.println("");

}

}

運行結果

複製代碼代碼如下:

--當前時間----

2014-03-25T17:03:40.553

--自定義時間----

2012-12-12

1970-05-31

17:18

10:15:30

--獲取時間的各個部分----

2014-03-25

MARCH

25

40

---設置並返回新的時間對象---

2010-03-10T17:03:40.553

---再加3週---

2010-04-21T17:03:40.553

---使用時間調整函數---

2014-03-25T17:03:40.553

2014-03-31T17:03:40.553

2014-03-19T17:03:40.553

2014-03-25T17:03:40.583

---截斷時間精確位--

2014-03-25T17:03:40.553

2014-03-25T17:03

2014-03-25T17:03:40

---使用時區---

2014-03-25T09:03:40.583Z[UTC]

+08:00

---時間上使用時區偏移---

17:03:40.585+08:00

11:03:40.585+02:00

---時間加減---

2014-03-25T17:03:40.585

2017-05-26T17:03:40.585

2014-03-25T17:03:43.585000005

2014-03-25T23:03:40.586