Java8中LocalDateTime与时间戳timestamp的互相转换

Java8中LocalDateTime与时间戳timestamp的互相转换

java8 LocalDateTime与timestamp转换

将timestamp转为LocalDateTime

public LocalDateTime timestamToDatetime(long timestamp){

Instant instant = Instant.ofEpochMilli(timestamp);

return LocalDateTime.ofInstant(instant, ZoneId.systemDefault());

}

将LocalDataTime转为timestamp

public long datatimeToTimestamp(LocalDateTime ldt){

long timestamp = ldt.toInstant(ZoneOffset.of("+8")).toEpochMilli();

return timestamp;

}

我在网上还找到了另一个将datetime转为时间戳的方法：

ZoneId zone = ZoneId.systemDefault();

long timestamp = ldt.atZone(zone).toInstant().toEpochMilli();

Java8的时间转为时间戳的大概的思路就是LocalDateTime先转为Instant，设置时区，然后转timestamp。

附一个Java8中的LocalDateTime工具类

工具类

package com.kingboy.common.utils.date;

import java.time.*;

import java.time.format.DateTimeFormatter;

import java.time.temporal.ChronoUnit;

import java.time.temporal.TemporalUnit;

import java.util.Date;

/*

* @author kingboy

* @Date 2017/7/22 下午2:12

* @Description LocalDateTimeUtils is used to Java8中的时间类

*/

public class LocalDateTimeUtils {

//获取当前时间的LocalDateTime对象

//LocalDateTime.now();

//根据年月日构建LocalDateTime

//LocalDateTime.of();

//比较日期先后

//LocalDateTime.now().isBefore(),

//LocalDateTime.now().isAfter(),

//Date转换为LocalDateTime

public static LocalDateTime convertDateToLDT(Date date) {

thtzhZVy return LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());

}

//LocalDateTime转换为Date

public static Date convertLDTToDate(LocalDateTime time) {

return Date.from(time.atZone(ZoneId.systemDefault()).toInstant());

}

//获取指定日期的毫秒

public static Long getMilliByTime(LocalDateTime time) {

return time.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();

}

//获取指定日期的秒

public static Long getSecondsByTime(LocalDateTime time) {

return time.atZone(ZoneId.systemDefault()).toInstant().getEpochSecond();

}

//获取指定时间的指定格式

public static String formatTime(LocalDateTime time,String pattern) {

return time.format(DateTimeFormatter.ofPattern(pattern));

}

//获取当前时间的指定格式

public static String formatNow(String pattern) {

return formatTime(LocalDateTime.now(), pattern);

}

//日期加上一个数,根据field不同加不同值,field为ChronoUnit.*

public static LocalDateTime plus(LocalDateTime time, long number, TemporalUnit field) {

return time.plus(number, field);

}

//日期减去一个数,根据field不同减不同值,field参数为ChronoUnit.*

public static LocalDateTime minu(LocalDateTime time, long number, TemporalUnit field){

return time.minus(number,field);

}

/**

* 获取两个日期的差 field参数为ChronoUnit.*

* @param startTime

* @param endTime

* @param field 单位(年月日时分秒)

* @return

*/

public static long betweenTwoTime(LocalDateTime startTime, LocalDateTime endTime, ChronoUnit field) {

Period period = Period.between(LocalDate.from(startTime), LocalDate.from(endTime));

if (field == ChronoUnit.YEARS) return period.getYears();

if (field == ChronoUnit.MONTHS) return period.getYears() * 12 + period.getMonths();

return field.between(startTime, endTime);

}

//获取一天的开始时间，2017,7,22 00:00

public static LocalDateTime getDayStart(LocalDateTime time) {

return time.withHour(0)

.withMinute(0)

.withSecond(0)

.withNano(0);

}

//获取一天的结束时间，2017,7,22 23:59:59.999999999

public static LocalDateTime getDayEnd(LocalDateTime time) {

return time.withHour(23)

.withMinute(59)

.withSecond(59)

.withNano(999999999);

}

}

测试类

package com.kingboy.common.localdatetimeutils;

import com.kingboy.common.utils.date.LocalDateTimeUtils;

import org.junit.Test;

import java.time.LocalDateTime;

import java.time.temporal.ChronoUnit;

import static com.kingboy.common.utils.date.LocalDateTimeUtils.getDayEnd;

import static com.kingboy.common.utils.date.LocalDateTimeUtils.getDayStart;

/**

* @author kingboy

* @Date 2017/7/22 下午7:16

* @Description LocaDateTimeUtilsTest is used to 测试LocalDateTime工具

*/

public class LocaDateTimeUtilsTest {

@Test

public void format_test() {

System.out.println(LocalDateTimeUtils.formatNow("yyyy年MM月dd日 HH:mm:ss"));

}

@Test

public void betweenTwoTime_test() {

LocalDateTime start = LocalDateTime.of(1993, 10, 13, 11, 11);

LocalDateTime end = LocalDateTime.of(1994, 11, 13, 13, 13);

System.out.println("年:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.YEARS));

System.out.println("月:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.MthtzhZVyONTHS));

System.out.println("日:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.DAYS));

System.out.println("半日:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.HALF_DAYS));

System.out.println("小时:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.HOURS));

System.out.println("分钟:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.MINUTES));

System.out.println("秒:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.SECONDS));

System.out.println("毫秒:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.MILLIS));

//=============================================================================================

/*

年:1

月:13

日:396

半日:792

小时:9506

分钟:570362

秒:34221720

毫秒:34221720000

*/

}

@Test

public void plus_test() {

//增加二十分钟

System.out.println(LocalDateTimeUtils.formatTime(LocalDateTimeUtils.plus(LocalDateTime.now(),

20,

ChronoUnit.MINUTES), "yyyy年MM月dd日 HH:mm"));

//增加两年

System.out.println(LocalDateTimeUtils.formatTime(LocalDateTimeUtils.plus(LocalDateTime.now(),

2,

ChronoUnit.YEARS), "yyyy年MM月dd日 HH:mm"));

//=============================================================================================

/*

2017年07月22日 22:53

2019年07月22日 22:33

*/

}

@Test

public void dayStart_test() {

System.out.println(getDayStart(LocalDateTime.now()));

System.out.println(getDayEnd(LocalDateTime.now()));

//=============================================================================================

/*

2017-07-22T00:00

2017-07-22T23:59:59.999999999

*/

}

}

总结

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