Java8中LocalDateTime与时间戳timestamp的互相转换及ChronoUnit工具类import java.time.*;import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalUnit;
import java.util.Date;
/**
* Java8中LocalDateTime与时间戳timestamp的互相转换
*/
public class DateUtils {
/**
*
* @param timestamp
* @return
*/
public static LocalDateTime timestamToDatetime(long timestamp){
Instant instant = Instant.ofEpochMilli(timestamp);
return LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
}
/**
*获取指定日期的毫秒
* @param ldt
* @return
*/
public static long datatimeToTimestamp(LocalDateTime ldt){
// long timestamp = ldt.toInstant(ZoneOffset.of("+8")).toEpochMilli();
// return timestamp;
ZoneId zone = ZoneId.systemDefault();
long timestamp = ldt.atZone(zone).toInstant().toEpochMilli();
return timestamp;
}//获取指定日期的秒public static LocalDateTime timestamToDatetimeSeconds(long timestamp){
Instant instant = Instant.ofEpochSecond(timestamp);
return LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
}
/**
* 获取指定日期的秒
* @param ldt
* @return
*/
public static long datatimeToTimestampSeconds(LocalDateTime ldt){
// long timestamp = ldt.toInstant(ZoneOffset.of("+8")).getEpochSecond();
// return timestamp;
ZoneId zone = ZoneId.systemDefault();
long timestamp = ldt.atZone(zone).toInstant().getEpochSecond();
return timestamp;
}
//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);
}
public static void main(String[] args) {
/**
* 1664509534345
* ldt=2022-09-30T11:45:34.345
* 1664509534
* ldtSecond=2022-09-30T11:45:34
*/
long dt = datatimeToTimestamp(LocalDateTime.now());
System.out.println(dt);
LocalDateTime ldt = timestamToDatetime(dt);
System.out.println("ldt=" + ldt);
long dtSecond = datatimeToTimestampSeconds(LocalDateTime.now());
System.out.println(dtSecond);
LocalDateTime ldtSecond = timestamToDatetimeSeconds(dtSecond);
System.out.println("ldtSecond=" + ldtSecond);
//2022年09月30日 11:52:49
System.out.println(formatNow("yyyy年MM月dd日 HH:mm:ss"));
/**
* 年:1
* 月:13
* 日:396
* 半日:792
* 小时:9506
* 分钟:570362
* 秒:34221720
* 毫秒:34221720000
*/
LocalDateTime start = LocalDateTime.of(1993, 10, 13, 11, 11);
LocalDateTime end = LocalDateTime.of(1994, 11, 13, 13, 13);
System.out.println("年:" + betweenTwoTime(start, end, ChronoUnit.YEARS));
System.out.println("月:" + betweenTwoTime(start, end, ChronoUnit.MONTHS));
System.out.println("日:" + betweenTwoTime(start, end, ChronoUnit.DAYS));
System.out.println("半日:" + betweenTwoTime(start, end, ChronoUnit.HALF_DAYS));
System.out.println("小时:" + betweenTwoTime(start, end, ChronoUnit.HOURS));
System.out.println("分钟:" + betweenTwoTime(start, end, ChronoUnit.MINUTES));
System.out.println("秒:" + betweenTwoTime(start, end, ChronoUnit.SECONDS));
System.out.println("毫秒:" + betweenTwoTime(start, end, ChronoUnit.MILLIS));
/**
* 2022年09月30日 12:12
* 2024年09月30日 11:52
*/
//增加二十分钟
System.out.println(formatTime(plus(LocalDateTime.now(),
20,
ChronoUnit.MINUTES), "yyyy年MM月dd日 HH:mm"));
//增加两年
System.out.println(formatTime(plus(LocalDateTime.now(),
2,
ChronoUnit.YEARS), "yyyy年MM月dd日 HH:mm"));
/**
* 2022-09-30T00:00
* 2022-09-30T23:59:59.999999999
*/
System.out.println(getDayStart(LocalDateTime.now()));
System.out.println(getDayEnd(LocalDateTime.now()));
//Get the current date
LocalDate today = LocalDate.now();
System.out.println("Current date: " + today);
//add 1 week to the current date
LocalDate nextWeek = today.plus(1, ChronoUnit.WEEKS);
System.out.println("Next week: " + nextWeek);
//add 1 month to the current date
LocalDate nextMonth = today.plus(1, ChronoUnit.MONTHS);
System.out.println("Next month: " + nextMonth);
//add 1 year to the current date
LocalDate nextYear = today.plus(1, ChronoUnit.YEARS);
System.out.println("Next year: " + nextYear);
//add 10 years to the current date
LocalDate nextDecade = today.plus(1, ChronoUnit.DECADES);
System.out.println("Date after ten year: " + nextDecade);
/**
* ChronoUnit====相差年-1
* 相差{-12}月，
* 相差天-365
*/
//获取当前时间（2022-09-30）
LocalDate today2 = LocalDate.now();
//将String转LocalDateTime
DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd");
LocalDate collectTimeDate = LocalDate.parse("2023-09-30",df);
//判断相差多少天
System.out.println("ChronoUnit====相差年" + ChronoUnit.YEARS.between(collectTimeDate,today2));
System.out.println(
"相差{"+ChronoUnit.MONTHS.between(collectTimeDate,today2)+"}月，" );
;
System.out.println(
"相差天"+ ChronoUnit.DAYS.between(collectTimeDate,today2));
;
/**
* ===ChronoUnit====相差年1
* 相差{12}月，
* 相差天365
*/
//判断相差多少天
System.out.println("===ChronoUnit====相差年" + ChronoUnit.YEARS.between(today2,collectTimeDate));
System.out.println(
"相差{"+ChronoUnit.MONTHS.between(today2,collectTimeDate)+"}月，" );
;
System.out.println(
"相差天"+ ChronoUnit.DAYS.between(today2,collectTimeDate));
;
}
}
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