常规使用

LocalDateTime now = LocalDateTime.now();   // 2020-01-29T14:35:51.207
int year = now.getYear();                  // 2020
Month month = now.getMonth();              // JANUARY
int monthValue = now.getMonthValue();      // 1
int dayOfYear = now.getDayOfYear();        // 29
int dayOfMonth = now.getDayOfMonth();      // 29
DayOfWeek dayOfWeek = now.getDayOfWeek();  // WEDNESDAY
int dayOfWeekValue = dayOfWeek.getValue(); // 3
int hour = now.getHour();                  // 14
int minute = now.getMinute();              // 35
int second = now.getSecond();              // 51

long seconds = Instant.now().getEpochSecond();    // 秒时间戳(10位)
long milliSeconds = Instant.now().toEpochMilli(); // 毫秒时间戳(13位)

LocalDateTime dateTimeFromSecond = LocalDateTime.ofInstant(
    Instant.ofEpochSecond(seconds), ZoneOffset.ofHours(8)
);  // 秒转datetime

LocalDateTime dateTimeFromMilliSecond = LocalDateTime.ofInstant(
    Instant.ofEpochMilli(milliSeconds), ZoneOffset.ofHours(8)
); // 毫秒转datetime

各种转换

String format = LocalDateTime.now().format(
    DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
);  // datetime转字符串

LocalDateTime dateTime = LocalDateTime.parse(
    format,
    DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
);  // 字符串转datetime

Date date = Date.from(dateTime.toInstant(ZoneOffset.ofHours(8)));                             // datetime转date
LocalDateTime fromDate = date.toInstant().atOffset(ZoneOffset.ofHours(8)).toLocalDateTime();  // date转datetime

自定义日期 / 日期加减

LocalDateTime dateTime = LocalDateTime.of(2020, 1, 29, 14, 35, 51); // 2020-01-29T14:35:51

LocalDateTime localDateTime1 = dateTime.minusSeconds(1);            // 2020-01-29T14:35:50
LocalDateTime localDateTime2 = dateTime.minusMinutes(1);            // 2020-01-29T14:34:51
LocalDateTime localDateTime3 = dateTime.minusHours(1);              // 2020-01-29T13:35:51
LocalDateTime localDateTime4 = dateTime.minusDays(1);               // 2020-01-28T14:35:51
LocalDateTime localDateTime5 = dateTime.minusWeeks(1);              // 2020-01-22T14:35:51
LocalDateTime localDateTime6 = dateTime.minusMonths(1);             // 2019-12-29T14:35:51
LocalDateTime localDateTime7 = dateTime.minusYears(1);              // 2019-01-29T14:35:51

增加的为对应的plus函数，如dateTime.plusSeconds(1)

比较日期

LocalDateTime now = LocalDateTime.now();     // 2020-01-29T14:35:51.207
LocalDateTime yesterday = now.minusDays(1);  // 2020-01-28T14:35:51.207
boolean after = now.isAfter(yesterday);      // true
boolean before = now.isBefore(yesterday);    // false
boolean equal = now.isEqual(yesterday);      // false

其他类

LocalDate日期

LocalDate dateNow = LocalDate.now();        // 2020-01-29
LocalDate date = LocalDate.of(2020, 1, 29); // 2020-01-29

LocalTime时间

LocalTime timeNow = LocalTime.now();       // 14:35:51.207
LocalTime time = LocalTime.of(23, 59, 59); // 23:59:59

LocalDateTime日期时间

LocalDateTime dateTimeNow = LocalDateTime.now();                    // 2020-01-29T14:35:51.207
LocalDateTime dateTime = LocalDateTime.of(2020, 1, 29, 23, 59, 59); // 2020-01-29T23:59:59

Instant时刻

long second = Instant.now().getEpochSecond();          // 1580279751
long milliSecond = Instant.now().toEpochMilli();       // 1580279751000
Instant instant1 = Instant.ofEpochSecond(second);     // 2020-01-29T14:35:51Z
Instant instant2 = Instant.ofEpochMilli(milliSecond); // 2020-01-29T14:35:51.207Z

Duration时间差

Duration duration = Duration.between(
    LocalDateTime.now(), LocalDateTime.now().plusDays(1)
);  // PT24H
long seconds = duration.getSeconds();             // 86400
long seconds2 = duration.get(ChronoUnit.SECONDS); // 86400

Duration ofDays = Duration.ofDays(1);             // PT24H
Duration ofHours = Duration.ofHours(1);           // PT1H
Duration ofMinutes = Duration.ofMinutes(1);       // PT1M
Duration ofSeconds = Duration.ofSeconds(1);       // PT1S

Period时间段

Period between = Period.between(
    LocalDate.of(2020, 1, 22), LocalDate.of(2020, 2, 9)
); // P18D
int year = between.getYears();   // 0
int month = between.getMonths(); // 0
int day = between.getDays();     // 18

Period period = Period.of(1, 2, 3); // P1Y2M3D
long years = period.get(ChronoUnit.YEARS);            // 1
long months = period.get(ChronoUnit.MONTHS);          // 2
long days = period.get(ChronoUnit.DAYS);              // 3

Clock时钟

Clock clock1 = Clock.system(ZoneOffset.ofHours(8));  // SystemClock[+08:00]
Clock clock2 = Clock.systemUTC();                    // SystemClock[Z]

long millis1 = clock1.millis();      // 1582285924008
long millis2 = clock2.millis();      // 1582285924008
Instant instant1 = clock1.instant(); // 2020-02-21T11:54:58.427Z
Instant instant2 = clock2.instant(); // 2020-02-21T11:54:58.428Z

最后

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