LocalDate&LocalTime&LocalDateTime

（一）LocalDate

方法 描述
MAX 最大日期
MIN 最小日期
static LocalDate now() 获取系统当前时间
static LocalDate parse(CharSequence text)
static LocalDate parse(CharSequence text, DateTimeFormatter formatter)		 将日期字符串转换成LocalDate类型
Temporal adjustInto(Temporal temporal) 将传入对象与该对象有相同的时间, 不改变原有LocalDate
LocalDateTime atStartOfDay()
ZonedDateTime atStartOfDay(ZoneId zone)		 获取当前日期的开始时间
LocalDateTime atTime(LocalTime time)
LocalDateTime atTime(int hour, int minute)
LocalDateTime atTime(int hour, int minute, int LocalDateTime second)
LocalDateTime atTime(int hour, int minute, int second, int nanoOfSecond)		 LocalDate添加LocalTime,变成LocalDateTime
String format(DateTimeFormatter formatter) 格式化
static LocalDate from(TemporalAccessor temporal) 从指定对象获取LocalDate
int get(TemporalField field)
long getLong(TemporalField field)		 获取当前日期中某个字段值返回int类型
获取当前日期中某个字段值返回long类型
IsoChronology getChronology() 获取当前日期的IsoChronology
int getDayOfMonth()
DayOfWeek getDayOfWeek()
int getDayOfYear()
Month getMonth()
int getMonthValue()
int lengthOfMonth()
int getYear()
int lengthOfYear()		 获取当前日期是所在月的第几天
获取当前日期是星期几（星期的英文全称）
获取当前日期是所在年的第几天
获取当前日期所在月份（月份的英文全称）
获取当前日期所在月份的数值
获取当前日期所在月份有多少天
获取当前日期所在年份的数值
获取当前日期所在年份有多少天
boolean isLeapYear()
boolean isAfter(ChronoLocalDate other)
boolean isBefore(ChronoLocalDate other)
boolean isEqual(ChronoLocalDate other)		 判断当前日期所在年是否是闰年
判断当前日期是否在指定日期之后
判断当前日期是否在指定日期之前
判断当前日期是否和指定日期相等
Era getEra() 获取当前对象的时代
boolean isSupported(TemporalField field)
boolean isSupported(TemporalUnit unit)		 判断当前日期对象是否有对应字段
LocalDate minus(TemporalAmount amountToSubtract)
LocalDate minus(long amountToSubtract, TemporalUnit unit)
LocalDate plus(TemporalAmount amountToAdd)
LocalDate plus(long amountToAdd, TemporalUnit unit)		 对当前日期对象进行增减
LocalDate minusDays(long daysToSubtract)
LocalDate minusWeeks(long weeksToSubtract)
LocalDate minusMonths(long monthsToSubtract)
LocalDate minusYears(long yearsToSubtract)
LocalDate plusDays(long daysToAdd)
LocalDate plusWeeks(long weeksToAdd)
LocalDate plusMonths(long monthsToAdd)
LocalDate plusYears(long yearsToAdd)		 对当前日期对象指定字段进行增减
static LocalDate of(int year, int month, int dayOfMonth)
static LocalDate of(int year, Month month, int dayOfMonth)
static LocalDate ofEpochDay(long epochDay)
static LocalDate ofYearDay(int year, int dayOfYear)		 创建LocalDate
long toEpochDay() 获取当前日期对象到1970-01-01的天数
Period until(ChronoLocalDate endDateExclusive)
long until(Temporal endExclusive, TemporalUnit unit)		 获取当前日期对象到指定日期的间隔
LocalDate with(TemporalAdjuster adjuster)
LocalDate withDayOfMonth(int dayOfMonth)
LocalDate withDayOfYear(int dayOfYear)
LocalDate withMonth(int month)
LocalDate withYear(int year)		 调整日期

eg：

//最大日期 +999999999-12-31
System.out.println("MAX: " + LocalDate.MAX);
System.out.println("-----------------");

//最小日期
System.out.println("MIN: " + LocalDate.MIN);
System.out.println("-----------------");

//获取系统当前时间
LocalDate now = LocalDate.now();
System.out.println("now: " + now);
System.out.println("-----------------");

//将日期字符串转换成LocalDate类型
LocalDate localDate1 = LocalDate.parse("2020-09-10");
LocalDate localDate2 = LocalDate.parse("2020:09:15", DateTimeFormatter.ofPattern("yyyy:MM:dd"));
System.out.println("localDate1: " + localDate1);
System.out.println("localDate2: " + localDate2);
System.out.println("-----------------");

//将传入对象与该对象有相同的时间, 不改变原有LocalDate
System.out.println("localDate2 adjustInto localDate1: " + localDate1.adjustInto(localDate2));
System.out.println("localDate2: " + localDate2);
System.out.println("-----------------");

//获取当前日期的开始时间,
System.out.println("localDate1 Start: " + localDate1.atStartOfDay());
ZoneId zoneId = ZoneId.of("Africa/Accra");
System.out.println("localDate1 Start: " + localDate1.atStartOfDay(zoneId));
System.out.println("-----------------");

//LocalDate添加LocalTime,变成LocalDateTime
System.out.println("localDate1 LocalDateTime: " + localDate1.atTime(LocalTime.now()));
System.out.println("localDate1 LocalDateTime: " + localDate1.atTime(12, 10));
System.out.println("localDate1 LocalDateTime: " + localDate1.atTime(12, 10, 30));
System.out.println("-----------------");

//格式化
DateTimeFormatter f1 = DateTimeFormatter.ofPattern("yyyy");
DateTimeFormatter f2 = DateTimeFormatter.ofPattern("yyyy-MM-dd");
System.out.println("localDate1 format yyyy: " + localDate1.format(f1));
System.out.println("localDate1 format yyyy-MM-dd: " + localDate1.format(f2));
System.out.println("-----------------");

//从指定对象获取LocalDate
System.out.println("from LocalDateTime now: " + LocalDate.from(LocalDateTime.now()));
System.out.println("from LocalDate now: " + LocalDate.from(LocalDate.now()));
System.out.println("from ZonedDateTime now: " + LocalDate.from(ZonedDateTime.now()));
System.out.println("-----------------");

//获取当前日期中某个字段值返回int类型
System.out.println("localDate1 get int YEAR: " + localDate1.get(ChronoField.YEAR));
System.out.println("localDate1 get int MONTH_OF_YEAR: " + localDate1.get(ChronoField.MONTH_OF_YEAR));
System.out.println("localDate1 get int DAY_OF_YEAR: " + localDate1.get(ChronoField.DAY_OF_YEAR));
System.out.println("localDate1 get int DAY_OF_WEEK: " + localDate1.get(ChronoField.DAY_OF_WEEK));
//获取当前日期中某个字段值返回long类型
System.out.println("localDate1 get long YEAR: " + localDate1.getLong(ChronoField.YEAR));
System.out.println("localDate1 get long MONTH_OF_YEAR: " + localDate1.getLong(ChronoField.MONTH_OF_YEAR));
System.out.println("localDate1 get long DAY_OF_YEAR: " + localDate1.getLong(ChronoField.DAY_OF_YEAR));
System.out.println("localDate1 get long DAY_OF_WEEK: " + localDate1.getLong(ChronoField.DAY_OF_WEEK));
System.out.println("-----------------");

//获取当前日期的IsoChronology
System.out.println("localDate1 IsoChronology: " + localDate1.getChronology());
System.out.println("-----------------");

//获取当前日期是所在月的第几天
System.out.println("localDate1 DayOfMonth: " + localDate1.getDayOfMonth());
//获取当前日期是星期几（星期的英文全称）
System.out.println("localDate1 DayOfWeek: " + localDate1.getDayOfWeek());
//获取当前日期是所在年的第几天
System.out.println("localDate1 DayOfYear: " + localDate1.getDayOfYear());
//获取当前日期所在月份（月份的英文全称）
System.out.println("localDate1 Month: " + localDate1.getMonth());
//获取当前日期所在月份的数值
System.out.println("localDate1 MonthValue: " + localDate1.getMonthValue());
//获取当前日期所在月份有多少天
System.out.println("localDate1 lengthOfMonth: " + localDate1.lengthOfMonth());
//获取当前日期所在年份的数值
System.out.println("localDate1 Year: " + localDate1.getYear());
//获取当前日期所在年份有多少天
System.out.println("localDate1 lengthOfYear: " + localDate1.lengthOfYear());
System.out.println("-----------------");

//判断当前日期所在年是否是闰年
System.out.println("localDate1 isLeapYear: " + localDate1.isLeapYear());
//判断当前日期是否在指定日期之后
System.out.println("localDate1 isAfter localDate2: " + localDate1.isAfter(localDate2));
//判断当前日期是否在指定日期之前
System.out.println("localDate1 isBefore localDate2: " + localDate1.isBefore(localDate2));
//判断当前日期是否和指定日期相等
System.out.println("localDate1 isEqual localDate2: " + localDate1.isEqual(localDate2));
System.out.println("-----------------");

//获取当前日期对象的时代
System.out.println("localDate1 Era: " + localDate1.getEra());
System.out.println("-----------------");

//判断当前日期对象是否有对应字段
System.out.println("localDate1 isSupported DAY_OF_WEEK: " + localDate1.isSupported(ChronoField.DAY_OF_WEEK));
System.out.println("localDate1 isSupported MINUTE_OF_DAY: " + localDate1.isSupported(ChronoField.MINUTE_OF_DAY));
System.out.println("localDate1 isSupported DECADES: " + localDate1.isSupported(ChronoUnit.DECADES));
System.out.println("-----------------");

//对当前日期对象进行增减
Period weeks = Period.ofWeeks(2);
System.out.println("localDate1 minus weeks: " + localDate1.minus(weeks));
System.out.println("localDate1 minus DAYS: " + localDate1.minus(1, ChronoUnit.DAYS));
System.out.println("localDate1 minus weeks: " + localDate1.plus(weeks));
System.out.println("localDate1 minus DAYS: " + localDate1.plus(1, ChronoUnit.DAYS));

//对当前日期对象指定字段进行增减
System.out.println("localDate1 minus Days: " + localDate1.minusDays(1));
System.out.println("localDate1 minus weeks: " + localDate1.minusWeeks(1));
System.out.println("localDate1 minus Months: " + localDate1.minusMonths(1));
System.out.println("localDate1 minus Years: " + localDate1.minusYears(1));
System.out.println("localDate1 plus Days: " + localDate1.plusDays(1));
System.out.println("localDate1 plus weeks: " + localDate1.plusWeeks(1));
System.out.println("localDate1 plus Months: " + localDate1.plusMonths(1));
System.out.println("localDate1 plus Years: " + localDate1.plusYears(1));
System.out.println("-----------------");

//创建LocalDate
System.out.println("LocalDate of: " + LocalDate.of(2020, 9, 16));
System.out.println("LocalDate of: " + LocalDate.of(2020, Month.APRIL, 15));
System.out.println("LocalDate ofEpochDay: " + LocalDate.ofEpochDay(15));
System.out.println("LocalDate ofYearDay: " + LocalDate.ofYearDay(2020, 35));
System.out.println("-----------------");

//获取当前日期对象到1970-01-01的天数
System.out.println("localDate1 EpochDay: " + localDate1.toEpochDay());
System.out.println("-----------------");

//获取当前日期对象到指定日期的间隔
System.out.println("localDate1 until: " + localDate1.until(LocalDate.now()));
System.out.println("localDate1 until now YEARS: " + localDate1.until(LocalDate.now(), ChronoUnit.YEARS));
System.out.println("localDate1 until now MONTHS: " + localDate1.until(LocalDate.now(), ChronoUnit.MONTHS));
System.out.println("localDate1 until now DAYS: " + localDate1.until(LocalDate.now(), ChronoUnit.DAYS));
System.out.println("-----------------");

//调整日期
System.out.println("localDate1 with now: " + localDate1.with(LocalDate.now()));
System.out.println("localDate1 with Month: " + localDate1.with(Month.DECEMBER));
System.out.println("localDate1 with TemporalAdjusters: " + localDate1.with(TemporalAdjusters.firstDayOfMonth()));
System.out.println("localDate1 withDayOfMonth: " + localDate1.withDayOfMonth(2));
System.out.println("localDate1 withDayOfYear: " + localDate1.withDayOfYear(2));
System.out.println("localDate1 withMonth: " + localDate1.withMonth(12));
System.out.println("localDate1 withYear: " + localDate1.withYear(2022));

运行结果：

MAX: +999999999-12-31
-----------------
MIN: -999999999-01-01
-----------------
now: 2020-09-16
-----------------
localDate1: 2020-09-10
localDate2: 2020-09-15
-----------------
localDate2 adjustInto localDate1: 2020-09-10
localDate2: 2020-09-15
-----------------
localDate1 Start: 2020-09-10T00:00
localDate1 Start: 2020-09-10T00:00Z[Africa/Accra]
-----------------
localDate1 LocalDateTime: 2020-09-10T21:00:06.710
localDate1 LocalDateTime: 2020-09-10T12:10
localDate1 LocalDateTime: 2020-09-10T12:10:30
-----------------
localDate1 format yyyy: 2020
localDate1 format yyyy-MM-dd: 2020-09-10
-----------------
from LocalDateTime now: 2020-09-16
from LocalDate now: 2020-09-16
from ZonedDateTime now: 2020-09-16
-----------------
localDate1 get int YEAR: 2020
localDate1 get int MONTH_OF_YEAR: 9
localDate1 get int DAY_OF_YEAR: 254
localDate1 get int DAY_OF_WEEK: 4
localDate1 get long YEAR: 2020
localDate1 get long MONTH_OF_YEAR: 9
localDate1 get long DAY_OF_YEAR: 254
localDate1 get long DAY_OF_WEEK: 4
-----------------
localDate1 IsoChronology: ISO
-----------------
localDate1 DayOfMonth: 10
localDate1 DayOfWeek: THURSDAY
localDate1 DayOfYear: 254
localDate1 Month: SEPTEMBER
localDate1 MonthValue: 9
localDate1 lengthOfMonth: 30
localDate1 Year: 2020
localDate1 lengthOfYear: 366
-----------------
localDate1 isLeapYear: true
localDate1 isAfter localDate2: false
localDate1 isBefore localDate2: true
localDate1 isEqual localDate2: false
-----------------
localDate1 Era: CE
-----------------
localDate1 isSupported DAY_OF_WEEK: true
localDate1 isSupported MINUTE_OF_DAY: false
localDate1 isSupported DECADES: true
-----------------
localDate1 minus weeks: 2020-08-27
localDate1 minus DAYS: 2020-09-09
localDate1 minus weeks: 2020-09-24
localDate1 minus DAYS: 2020-09-11
localDate1 minus Days: 2020-09-09
localDate1 minus weeks: 2020-09-03
localDate1 minus Months: 2020-08-10
localDate1 minus Years: 2019-09-10
localDate1 plus Days: 2020-09-11
localDate1 plus weeks: 2020-09-17
localDate1 plus Months: 2020-10-10
localDate1 plus Years: 2021-09-10
-----------------
LocalDate of: 2020-09-16
LocalDate of: 2020-04-15
LocalDate ofEpochDay: 1970-01-16
LocalDate ofYearDay: 2020-02-04
-----------------
localDate1 EpochDay: 18515
-----------------
localDate1 until: P6D
localDate1 until now YEARS: 0
localDate1 until now MONTHS: 0
localDate1 until now DAYS: 6
-----------------
localDate1 with now: 2020-09-16
localDate1 with Month: 2020-12-10
localDate1 with TemporalAdjusters: 2020-09-01
localDate1 withDayOfMonth: 2020-09-02
localDate1 withDayOfYear: 2020-01-02
localDate1 withMonth: 2020-12-10
localDate1 withYear: 2022-09-10
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原文地址：https://www.cnblogs.com/s-star/p/13679862.html