jdk8的datetime时间函数使用示例

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 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(""); }}
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