Java8中LocalDateTime与时间戳timestamp的互相转换
作者：荒野大码农
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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) {
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.MONTHS));
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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