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新工夫类型LocalDateTime，OffsetDateTime，LocalDate

//截取到天，小时System.out.println(LocalDateTime.now().truncatedTo(ChronoUnit.DAYS));System.out.println(LocalDateTime.now().truncatedTo(ChronoUnit.HOURS));//输入2020-05-06T00:002020-05-06T13:00//设置小时为14点System.out.println(LocalDateTime.now().withHour(14));//减去12天System.out.println(LocalDateTime.now().minusDays(12));//减少12小时System.out.println(LocalDateTime.now().plusHours(12));//设定0时区工夫，截取到整日，设定12点OffsetDateTime.now(ZoneOffset.of("+00:00")).truncatedTo(ChronoUnit.DAYS).withHour(12)//获取上海时区的工夫OffsetDateTime.now(ZoneId.of("Asia/Shanghai"))//实间转换LocalDate loc = LocalDate.parse("2020-01-02");System.out.println(loc);DateTimeFormatter usDateformatter = DateTimeFormatter.ofPattern("MM-dd-yyyy");System.out.println(usDateformatter.format(loc));//输入2020-01-0201-02-2020//当parse的格局不是本地工夫格局是，须要通过对应的formatter格局LocalDate newDate = LocalDate.parse("07-04-2020",usDateformatter);System.out.println(newDate);//输入2020-07-04

旧版本time类型Calendar，Date

Calendar cal = Calendar.getInstance();cal.set(2020,1,26);Date date = cal.getTime();System.out.println(date);//输入Wed Feb 26 22:01:51 CST 2020cal.add(Calendar.DAY_OF_MONTH,7);System.out.println(cal.getTime());//输入Wed Mar 04 22:01:51 CST 2020

新Time类型Instant是不可扭转的

System.out.println(Instant.MIN);System.out.println(Instant.now());System.out.println(Instant.MAX);//输入-1000000000-01-01T00:00:00Z2020-05-17T14:10:23.739Z+1000000000-12-31T23:59:59.999999999Z

Duration，包含toDays()，toHours(),toMinutes(),toNanos()等办法,minus()减去，plus减少，multipliedBy乘以

Instant start = Instant.now();Thread.sleep(1);Instant end = Instant.now();Duration duration = Duration.between(start,end);long millionSeconds = duration.toMillis();System.out.println(millionSeconds);//输入1

LocalDate

TemporalAdjusters包含的办法：firstDayOfMonth，lastDayOfMonth，firstDayOfYear，lastDayOfYear，firstDayOfNextMonth，firstDayOfNextYear
firstInMonth(DayOfWeek.SUNDAY,lastInMonth(DayOfWeek.SUNDAY),dayOfWeekInMonth(2,DayOfWeek.SUNDAY)
next(DayOfWeek.SUNDAY),nextOrSame(DayOfWeek.SUNDAY),previous(DayOfWeek.SUNDAY),previousOrSame(DayOfWeek.SUNDAY)

LocalDate now = LocalDate.now();LocalDate dateOfBirth = LocalDate.of(1987, Month.NOVEMBER, 23);System.out.println(dateOfBirth);System.out.println(now);//输入1987-11-232020-05-18Period p = dateOfBirth.until(now);System.out.println("Years:"+p.getYears());//输入Years:32Long days = dateOfBirth.until(now,ChronoUnit.DAYS);System.out.println("Days:"+days);//输入Days:11865//其中的month差距只是余数，不是和下面的一样共计多少个月，而是除去整年后差的月数System.out.println(p.get(ChronoUnit.YEARS));System.out.println(p.get(ChronoUnit.MONTHS));//输入325LocalDate nextSunday = LocalDate.now().with(TemporalAdjusters.next(DayOfWeek.SUNDAY));System.out.println(nextSunday);//输入2020-05-24

LocalTime

LocalTime localTime = LocalTime.now();System.out.println(localTime);System.out.println(localTime.plusHours(8));System.out.println(LocalTime.of(20,10));//输入20:28:59.82304:30:25.36720:10

ZonedDateTime

Set<String> allZoneIds = ZoneId.getAvailableZoneIds();for(String zoneId:allZoneIds){    if(zoneId.contains("America")){        System.out.println(zoneId);    }}//输入很多临时疏忽ZoneId ukTZ = ZoneId.of("Asia/Shanghai");System.out.println(ukTZ);ZonedDateTime currentMetting = ZonedDateTime.of(LocalDate.of(2020,Month.JUNE,18),        LocalTime.of(10,0),ZoneId.of("Asia/Shanghai"));ZonedDateTime nextMetting = currentMetting.plus(Period.ofMonths(1));ZonedDateTime nextUsMeeting = nextMetting.withZoneSameInstant(ZoneId.of("America/New_York"));System.out.println(currentMetting);System.out.println(nextMetting);System.out.println(nextUsMeeting);//输入2020-06-18T10:00+08:00[Asia/Shanghai]2020-07-18T10:00+08:00[Asia/Shanghai]2020-07-17T22:00-04:00[America/New_York]

DateTimeFormatter

System.out.println("ISO_DATE_TIME="+DateTimeFormatter.ISO_DATE_TIME.format(currentMetting));System.out.println("RFC_1123_DATE_TIME="+DateTimeFormatter.RFC_1123_DATE_TIME.format(currentMetting));//输入ISO_DATE_TIME=2020-06-18T10:00:00+08:00[Asia/Shanghai]RFC_1123_DATE_TIME=Thu, 18 Jun 2020 10:00:00 +0800

老版本工夫和新版本工夫转换

Instant instant = Instant.now();Date date = Date.from(instant);instant = date.toInstant();Timestamp timestamp = Timestamp.from(instant);instant = timestamp.toInstant();