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 = Instant(ZoneOffset.of("+8")).toEpochMilli();
return timestamp;
}
我在⽹上还到了另⼀个将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.kingboymon.utils.date;
import java.time.*;
import java.time.format.DateTimeFormatter;
import poral.ChronoUnit;
import poral.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
//w();
//根据年⽉⽇构建LocalDateTimejava时间日期格式转换
//LocalDateTime.of();
/
/⽐较⽇期先后
//w().isBefore(),
//w().isAfter(),
//Date转换为LocalDateTime
public static LocalDateTime convertDateToLDT(Date date) {
return LocalDateTime.Instant(), 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 w(), 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) Years();
if (field == ChronoUnit.MONTHS) Years() * 12 + Months();
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.kingboymon.localdatetimeutils;
import com.kingboymon.utils.date.LocalDateTimeUtils;
import org.junit.Test;
import java.time.LocalDateTime;
import poral.ChronoUnit;
import static com.kingboymon.utils.DayEnd;
import static com.kingboymon.utils.DayStart;
/**
* @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.w(),
20,
ChronoUnit.MINUTES), "yyyy年MM⽉dd⽇ HH:mm"));
/
/增加两年
System.out.println(LocalDateTimeUtils.formatTime(LocalDateTimeUtils.w(),
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(w()));
System.out.println(w()));
//=============================================================================================
/*
2017-07-22T00:00
2017-07-22T23:59:59.999999999
*/
}
}
总结
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