jdk8时间相关类

• JDK8时间相关类
• • 1.1 ZoneId 时区
  • 1.2 Instant 时间戳
  • 1.3 ZoneDateTime 带时区的时间
  • 1.4DateTimeFormatter 用于时间的格式化和解析
  • 1.5LocalDate 年、月、日
  • 1.6 LocalTime 时、分、秒
  • 1.7 LocalDateTime 年、月、日、时、分、秒
  • 1.8 Duration 时间间隔（秒，纳，秒）
  • 1.9 Period 时间间隔（年，月，日）
  • 1.10 ChronoUnit 时间间隔（所有单位）

JDK8时间相关类

1.1 ZoneId 时区

//1.获取所有的时区名称Set<String> zoneIds = ZoneId.getAvailableZoneIds();System.out.println(zoneIds.size());//600System.out.println(zoneIds);// Asia/Shanghai//2.获取当前系统的默认时区ZoneId zoneId = ZoneId.systemDefault();System.out.println(zoneId);//Asia/Shanghai//3.获取指定的时区ZoneId zoneId1 = ZoneId.of("Asia/Pontianak");System.out.println(zoneId1);//Asia/Pontianak

1.2 Instant 时间戳

//1.获取当前时间的Instant对象(标准时间)Instant now = Instant.now();System.out.println(now);//2.根据(秒/毫秒/纳秒)获取Instant对象Instant instant1 = Instant.ofEpochMilli(0L);System.out.println(instant1);//1970-01-01T00:00:00zInstant instant2 = Instant.ofEpochSecond(1L);System.out.println(instant2);//1970-01-01T00:00:01ZInstant instant3 = Instant.ofEpochSecond(1L, 1000000000L);System.out.println(instant3);//1970-01-01T00:00:027//3. 指定时区ZonedDateTime time = Instant.now().atZone(ZoneId.of("Asia/Shanghai"));System.out.println(time);//4.isXxx 判断Instant instant4=Instant.ofEpochMilli(0L);Instant instant5 =Instant.ofEpochMilli(1000L);//5.用于时间的判断//isBefore:判断调用者代表的时间是否在参数表示时间的前面boolean result1=instant4.isBefore(instant5);System.out.println(result1);//true//isAfter:判断调用者代表的时间是否在参数表示时间的后面boolean result2 = instant4.isAfter(instant5);System.out.println(result2);//false//6.Instant minusXxx(long millisToSubtract) 减少时间系列的方法Instant instant6 =Instant.ofEpochMilli(3000L);System.out.println(instant6);//1970-01-01T00:00:03ZInstant instant7 =instant6.minusSeconds(1);System.out.println(instant7);//1970-01-01T00:00:02Z

1.3 ZoneDateTime 带时区的时间

//1.获取当前时间对象(带时区)ZonedDateTime now = ZonedDateTime.now();System.out.println(now);//2.获取指定的时间对象(带时区)1/年月日时分秒纳秒方式指定ZonedDateTime time1 = ZonedDateTime.of(2023, 10, 1,           11, 12, 12, 0, ZoneId.of("Asia/Shanghai"));System.out.println(time1);//通过Instant + 时区的方式指定获取时间对象Instant instant = Instant.ofEpochMilli(0L);ZoneId zoneId = ZoneId.of("Asia/Shanghai");ZonedDateTime time2 = ZonedDateTime.ofInstant(instant, zoneId);System.out.println(time2);//3.withXxx 修改时间系列的方法ZonedDateTime time3 = time2.withYear(2000);System.out.println(time3);//4. 减少时间ZonedDateTime time4 = time3.minusYears(1);System.out.println(time4);//5.增加时间ZonedDateTime time5 = time4.plusYears(1);System.out.println(time5);

1.4DateTimeFormatter 用于时间的格式化和解析

//获取时间对象ZonedDateTime time = Instant.now().atZone(ZoneId.of("Asia/Shanghai"));// 解析/格式化器DateTimeFormatter dtf1=DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm;ss EE a");// 格式化System.out.println(dtf1.format(time));

1.5LocalDate 年、月、日

//1.获取当前时间的日历对象(包含 年月日)LocalDate nowDate = LocalDate.now();//System.out.println("今天的日期:" + nowDate);//2.获取指定的时间的日历对象LocalDate ldDate = LocalDate.of(2023, 1, 1);System.out.println("指定日期:" + ldDate);System.out.println("=============================");//3.get系列方法获取日历中的每一个属性值//获取年int year = ldDate.getYear();System.out.println("year: " + year);//获取月//方式一:Month m = ldDate.getMonth();System.out.println(m);System.out.println(m.getValue());//方式二:int month = ldDate.getMonthValue();System.out.println("month: " + month);//获取日int day = ldDate.getDayOfMonth();System.out.println("day:" + day);//获取一年的第几天int dayofYear = ldDate.getDayOfYear();System.out.println("dayOfYear:" + dayofYear);//获取星期DayOfWeek dayOfWeek = ldDate.getDayOfWeek();System.out.println(dayOfWeek);System.out.println(dayOfWeek.getValue());//is开头的方法表示判断System.out.println(ldDate.isBefore(ldDate));System.out.println(ldDate.isAfter(ldDate));//with开头的方法表示修改，只能修改年月日LocalDate withLocalDate = ldDate.withYear(2000);System.out.println(withLocalDate);//minus开头的方法表示减少，只能减少年月日LocalDate minusLocalDate = ldDate.minusYears(1);System.out.println(minusLocalDate);//plus开头的方法表示增加，只能增加年月日LocalDate plusLocalDate = ldDate.plusDays(1);System.out.println(plusLocalDate);//-------------// 判断今天是否是你的生日LocalDate birDate = LocalDate.of(2000, 1, 1);LocalDate nowDate1 = LocalDate.now();MonthDay birMd = MonthDay.of(birDate.getMonthValue(), birDate.getDayOfMonth());MonthDay nowMd = MonthDay.from(nowDate1);System.out.println("今天是你的生日吗? " + birMd.equals(nowMd));//今天是你的生日吗?

1.6 LocalTime 时、分、秒

// 获取本地时间的日历对象。(包含 时分秒)LocalTime nowTime = LocalTime.now();System.out.println("今天的时间:" + nowTime);int hour = nowTime.getHour();//时System.out.println("hour: " + hour);int minute = nowTime.getMinute();//分System.out.println("minute: " + minute);int second = nowTime.getSecond();//秒System.out.println("second:" + second);int nano = nowTime.getNano();//纳秒System.out.println("nano:" + nano);System.out.println("------------------------------------");System.out.println(LocalTime.of(8, 20));//时分System.out.println(LocalTime.of(8, 20, 30));//时分秒System.out.println(LocalTime.of(8, 20, 30, 150));//时分秒纳秒LocalTime mTime = LocalTime.of(8, 20, 30, 150);//is系列的方法System.out.println(nowTime.isBefore(mTime));System.out.println(nowTime.isAfter(mTime));//with系列的方法，只能修改时、分、秒System.out.println(nowTime.withHour(10));//plus系列的方法，只能修改时、分、秒System.out.println(nowTime.plusHours(10));

1.7 LocalDateTime 年、月、日、时、分、秒

// 当前时间的的日历对象(包含年月日时分秒)LocalDateTime nowDateTime = LocalDateTime.now();System.out.println("今天是:" + nowDateTime);//今天是：System.out.println(nowDateTime.getYear());//年System.out.println(nowDateTime.getMonthValue());//月System.out.println(nowDateTime.getDayOfMonth());//日System.out.println(nowDateTime.getHour());//时System.out.println(nowDateTime.getMinute());//分System.out.println(nowDateTime.getSecond());//秒System.out.println(nowDateTime.getNano());//纳秒// 日:当年的第几天System.out.println("dayofYear:" + nowDateTime.getDayOfYear());//星期System.out.println(nowDateTime.getDayOfWeek());System.out.println(nowDateTime.getDayOfWeek().getValue());//月份System.out.println(nowDateTime.getMonth());System.out.println(nowDateTime.getMonth().getValue());LocalDate ld = nowDateTime.toLocalDate();System.out.println(ld);LocalTime lt = nowDateTime.toLocalTime();System.out.println(lt.getHour());System.out.println(lt.getMinute());System.out.println(lt.getSecond());

1.8 Duration 时间间隔（秒，纳，秒）

// 本地日期时间对象。LocalDateTime today = LocalDateTime.now();System.out.println(today);// 出生的日期时间对象LocalDateTime birthDate = LocalDateTime.of(2000, 1, 1, 0, 0, 0);System.out.println(birthDate);Duration duration = Duration.between(birthDate, today);//第二个参数减第一个参数System.out.println("相差的时间间隔对象:" + duration);System.out.println("============================================");System.out.println(duration.toDays());//两个时间差的天数System.out.println(duration.toHours());//两个时间差的小时数System.out.println(duration.toMinutes());//两个时间差的分钟数System.out.println(duration.toMillis());//两个时间差的毫秒数System.out.println(duration.toNanos());//两个时间差的纳秒数

1.9 Period 时间间隔（年，月，日）

// 当前本地 年月日LocalDate today = LocalDate.now();System.out.println(today);// 生日的 年月日LocalDate birthDate = LocalDate.of(2000, 1, 1);System.out.println(birthDate);Period period = Period.between(birthDate, today);//第二个参数减第一个参数System.out.println("相差的时间间隔对象:" + period);System.out.println(period.getYears());System.out.println(period.getMonths());System.out.println(period.getDays());System.out.println(period.toTotalMonths());

1.10 ChronoUnit 时间间隔（所有单位）

// 当前时间LocalDateTime today = LocalDateTime.now();System.out.println(today);// 生日时间LocalDateTime birthDate = LocalDateTime.of(2000, 1, 1,0, 0, 0);System.out.println(birthDate);System.out.println("相差的年数:" + ChronoUnit.YEARS.between(birthDate, today));System.out.println("相差的月数:" + ChronoUnit.MONTHS.between(birthDate, today));System.out.println("相差的周数:" + ChronoUnit.WEEKS.between(birthDate, today));System.out.println("相差的天数:" + ChronoUnit.DAYS.between(birthDate, today));System.out.println("相差的时数:" + ChronoUnit.HOURS.between(birthDate, today));System.out.println("相差的分数:" + ChronoUnit.MINUTES.between(birthDate, today));System.out.println("相差的秒数:" + ChronoUnit.SECONDS.between(birthDate, today));System.out.println("相差的毫秒数:" + ChronoUnit.MILLIS.between(birthDate, today));System.out.println("相差的微秒数:" + ChronoUnit.MICROS.between(birthDate, today));System.out.println("相差的纳秒数:" + ChronoUnit.NANOS.between(birthDate, today));System.out.println("相差的半天数:" + ChronoUnit.HALF_DAYS.between(birthDate, today));System.out.println("相差的十年数:" + ChronoUnit.DECADES.between(birthDate, today));System.out.println("相差的世纪(百年)数:" + ChronoUnit.CENTURIES.between(birthDate, today));System.out.println("相差的千年数:" + ChronoUnit.MILLENNIA.between(birthDate, today));System.out.println("相差的纪元数:" + ChronoUnit.ERAS.between(birthDate, today));

后记
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来源地址：https://blog.csdn.net/m0_59230408/article/details/132313327