jdk8的datetime时间函数使用示例

jdk8已发布，写了一个datetime时间函数使用方法的小示例

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

--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