JDK8已发布，写了一个datetime时间函数使用方法的小示例

复制代码 代码如下:

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) {

// 创建时间对象

LocalDateTime timePoint = LocalDateTime.now(); // 当前时间

System.out.println("--当前时间----");

System.out.println(timePoint);

System.out.println("");

System.out.println("--自定义时间----");

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("--获取时间的各个部分----");

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("---设置并返回新的时间对象---");

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

System.out.println(thePast);

System.out.println("---再加3周---");

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

ChronoUnit.WEEKS);

System.out.println(yetAnother);

System.out.println("");

System.out.println("---使用时间调整函数---");

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("---截断时间精确位--");

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("---使用时区---");

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("---时间上使用时区偏移---");

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("---时间加减---");

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("");

}

}

运行结果

复制代码 代码如下:

--当前时间----

2014-03-25T17:03:40.553

--自定义时间----

2012-12-12

1970-05-31

17:18

10:15:30

--获取时间的各个部分----

2014-03-25

MARCH

25

40

---设置并返回新的时间对象---

2010-03-10T17:03:40.553

---再加3周---

2010-04-21T17:03:40.553

---使用时间调整函数---

2014-03-25T17:03:40.553

2014-03-31T17:03:40.553

2014-03-19T17:03:40.553

2014-03-25T17:03:40.583

---截断时间精确位--

2014-03-25T17:03:40.553

2014-03-25T17:03

2014-03-25T17:03:40

---使用时区---

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

+08:00

---时间上使用时区偏移---

17:03:40.585+08:00

11:03:40.585+02:00

---时间加减---

2014-03-25T17:03:40.585

2017-05-26T17:03:40.585

2014-03-25T17:03:43.585000005

2014-03-25T23:03:40.586