Java : ChronoLocalDateTime - API使用例

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 10, 13, 30);
System.out.println(dateTime); // 2100-04-10T13:30

System.out.println(dateTime.plus(Period.ofDays(5))); // 2100-04-15T13:30
System.out.println(dateTime.minus(Period.ofYears(101))); // 1999-04-10T13:30

System.out.println(dateTime.plus(Duration.ofHours(3))); // 2100-04-10T16:30
System.out.println(dateTime.minus(Duration.ofMinutes(25))); // 2100-04-10T13:05

default Temporal adjustInto (Temporal temporal)

指定された時間的オブジェクトをこのオブジェクトと同じ日付と時間になるように調整します。

final var zone = ZoneId.of("Etc/GMT+1");
System.out.println(zone); // Etc/GMT+1

final var temporal = ZonedDateTime.of(2100, 4, 7, 13, 30, 0, 0, zone);
System.out.println(temporal); // 2100-04-07T13:30-01:00[Etc/GMT+1]

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(1800, 1, 2, 3, 4);
System.out.println(dateTime); // 1800-01-02T03:04

final var ret = dateTime.adjustInto(temporal);
System.out.println(ret); // 1800-01-02T03:04-01:00[Etc/GMT+1]

ChronoZonedDateTime<D> atZone (ZoneId zone)

この時間をタイムゾーンと組み合わせて、ChronoZonedDateTimeを作成します。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 10, 13, 30);
System.out.println(dateTime); // 2100-04-10T13:30

final var ret = dateTime.atZone(ZoneOffset.UTC);
System.out.println(ret); // 2100-04-10T13:30Z

default int compareTo (ChronoLocalDateTime<?> other)

暦を含めて、この日付/時間を別の日付/時間と比較します。

final ChronoLocalDateTime<LocalDate> dateTime1 = LocalDateTime.of(2100, 1, 1, 0, 0);
final ChronoLocalDateTime<LocalDate> dateTime2 = LocalDateTime.of(2100, 1, 1, 0, 0);

System.out.println(dateTime1); // 2100-01-01T00:00
System.out.println(dateTime2); // 2100-01-01T00:00
System.out.println(dateTime1.compareTo(dateTime2)); // 0

final ChronoLocalDateTime<LocalDate> dateTime1 = LocalDateTime.of(2100, 4, 14, 15, 20);
final ChronoLocalDateTime<LocalDate> dateTime2 = LocalDateTime.of(2100, 4, 14, 15, 21);

System.out.println(dateTime1); // 2100-04-14T15:20
System.out.println(dateTime2); // 2100-04-14T15:21
System.out.println(dateTime1.compareTo(dateTime2)); // -1

final ChronoLocalDateTime<LocalDate> dateTime1 = LocalDateTime.of(2100, 4, 15, 0, 0);
final ChronoLocalDateTime<LocalDate> dateTime2 = LocalDateTime.of(2100, 4, 14, 0, 0);

System.out.println(dateTime1); // 2100-04-15T00:00
System.out.println(dateTime2); // 2100-04-14T00:00
System.out.println(dateTime1.compareTo(dateTime2)); // 1

boolean equals (Object obj)

暦を含めて、この日付/時間が別の日付/時間と等しいかどうかをチェックします。

final ChronoLocalDateTime<LocalDate> dateTime1 = LocalDateTime.of(2100, 1, 1, 0, 0);
final ChronoLocalDateTime<LocalDate> dateTime2 = LocalDateTime.of(2100, 1, 1, 0, 0);

System.out.println(dateTime1); // 2100-01-01T00:00
System.out.println(dateTime2); // 2100-01-01T00:00
System.out.println(dateTime1.equals(dateTime2)); // true

final ChronoLocalDateTime<LocalDate> dateTime1 = LocalDateTime.of(2100, 4, 14, 15, 20);
final ChronoLocalDateTime<LocalDate> dateTime2 = LocalDateTime.of(2100, 4, 14, 15, 21);

System.out.println(dateTime1); // 2100-04-14T15:20
System.out.println(dateTime2); // 2100-04-14T15:21
System.out.println(dateTime1.equals(dateTime2)); // false

final ChronoLocalDateTime<LocalDate> dateTime1 = LocalDateTime.of(2100, 4, 15, 0, 0);
final ChronoLocalDateTime<LocalDate> dateTime2 = LocalDateTime.of(2100, 4, 14, 0, 0);

System.out.println(dateTime1); // 2100-04-15T00:00
System.out.println(dateTime2); // 2100-04-14T00:00
System.out.println(dateTime1.equals(dateTime2)); // false

default String format (DateTimeFormatter formatter)

指定されたフォーマッタを使用してこの日付/時間を書式設定します。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 10, 13, 30);
System.out.println(dateTime); // 2100-04-10T13:30

final var ret = dateTime.format(DateTimeFormatter.ISO_DATE_TIME);
System.out.println(ret); // 2100-04-10T13:30:00

static ChronoLocalDateTime<?> from (TemporalAccessor temporal)

時間的オブジェクトからChronoLocalDateTimeのインスタンスを取得します。

final var zone = ZoneId.of("Etc/GMT+1");
System.out.println(zone); // Etc/GMT+1

final var temporal = ZonedDateTime.of(2100, 4, 15, 13, 30, 0, 0, zone);
System.out.println(temporal); // 2100-04-15T13:30-01:00[Etc/GMT+1]
System.out.println(ChronoLocalDateTime.from(temporal)); // 2100-04-15T13:30

default Chronology getChronology ()

この日付/時間の暦を取得します。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 10, 13, 30);
System.out.println(dateTime); // 2100-04-10T13:30
System.out.println(dateTime.getChronology()); // ISO

int hashCode ()

この日付/時間のハッシュ・コード。

final ChronoLocalDateTime<LocalDate> dateTime1 = LocalDateTime.of(2100, 4, 10, 13, 30);
System.out.println(dateTime1.hashCode()); // -1845627591

final ChronoLocalDateTime<LocalDate> dateTime2 = LocalDateTime.of(1800, 1, 1, 0, 0);
System.out.println(dateTime2.hashCode()); // 3686465

default boolean isAfter (ChronoLocalDateTime<?> other)

暦を無視して、この日付/時間が、指定された日付/時間の後であるかどうかをチェックします。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 1, 1, 0, 0);
System.out.println(dateTime); // 2100-01-01T00:00

final var dateTime2 = LocalDateTime.of(2099, 12, 31, 23, 59);
final var dateTime3 = LocalDateTime.of(2100, 1, 1, 0, 0);
final var dateTime4 = LocalDateTime.of(2100, 1, 2, 0, 0);

System.out.println(dateTime2); // 2099-12-31T23:59
System.out.println(dateTime3); // 2100-01-01T00:00
System.out.println(dateTime4); // 2100-01-02T00:00

System.out.println(dateTime.isAfter(dateTime2)); // true
System.out.println(dateTime.isAfter(dateTime3)); // false
System.out.println(dateTime.isAfter(dateTime4)); // false

default boolean isBefore (ChronoLocalDateTime<?> other)

暦を無視して、この日付/時間が、指定された日付/時間の前であるかどうかをチェックします。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 1, 1, 0, 0);
System.out.println(dateTime); // 2100-01-01T00:00

final var dateTime2 = LocalDateTime.of(2099, 12, 31, 23, 59);
final var dateTime3 = LocalDateTime.of(2100, 1, 1, 0, 0);
final var dateTime4 = LocalDateTime.of(2100, 1, 2, 0, 0);

System.out.println(dateTime2); // 2099-12-31T23:59
System.out.println(dateTime3); // 2100-01-01T00:00
System.out.println(dateTime4); // 2100-01-02T00:00

System.out.println(dateTime.isBefore(dateTime2)); // false
System.out.println(dateTime.isBefore(dateTime3)); // false
System.out.println(dateTime.isBefore(dateTime4)); // true

default boolean isEqual (ChronoLocalDateTime<?> other)

暦を無視して、この日付/時間が、指定された日付/時間と等しいかどうかをチェックします。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 1, 1, 0, 0);
System.out.println(dateTime); // 2100-01-01T00:00

final var dateTime2 = LocalDateTime.of(2099, 12, 31, 23, 59);
final var dateTime3 = LocalDateTime.of(2100, 1, 1, 0, 0);
final var dateTime4 = LocalDateTime.of(2100, 1, 2, 0, 0);

System.out.println(dateTime2); // 2099-12-31T23:59
System.out.println(dateTime3); // 2100-01-01T00:00
System.out.println(dateTime4); // 2100-01-02T00:00

System.out.println(dateTime.isEqual(dateTime2)); // false
System.out.println(dateTime.isEqual(dateTime3)); // true
System.out.println(dateTime.isEqual(dateTime4)); // false

boolean isSupported (TemporalField field)

指定されたフィールドがサポートされているかどうかをチェックします。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 1, 1, 0, 0);
System.out.println(dateTime); // 2100-01-01T00:00

System.out.println("-- supported fields --");
for (final var field : ChronoField.values()) {
    if (dateTime.isSupported(field)) {
        System.out.println(field);
    }
}

// 結果
// ↓
//-- supported fields --
//NanoOfSecond
//NanoOfDay
//MicroOfSecond
//MicroOfDay
//MilliOfSecond
//MilliOfDay
//SecondOfMinute
//SecondOfDay
//MinuteOfHour
//MinuteOfDay
//HourOfAmPm
//ClockHourOfAmPm
//HourOfDay
//ClockHourOfDay
//AmPmOfDay
//DayOfWeek
//AlignedDayOfWeekInMonth
//AlignedDayOfWeekInYear
//DayOfMonth
//DayOfYear
//EpochDay
//AlignedWeekOfMonth
//AlignedWeekOfYear
//MonthOfYear
//ProlepticMonth
//YearOfEra
//Year
//Era

default boolean isSupported (TemporalUnit unit)

指定された単位がサポートされているかどうかをチェックします。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 1, 1, 0, 0);
System.out.println(dateTime); // 2100-01-01T00:00

System.out.println("-- supported units --");
for (final var unit : ChronoUnit.values()) {
    if (dateTime.isSupported(unit)) {
        System.out.println(unit);
    }
}

// 結果
// ↓
//-- supported units --
//Nanos
//Micros
//Millis
//Seconds
//Minutes
//Hours
//HalfDays
//Days
//Weeks
//Months
//Years
//Decades
//Centuries
//Millennia
//Eras

default ChronoLocalDateTime<D> minus (long amountToSubtract, TemporalUnit unit)

指定された期間を減算して、このオブジェクトと同じ型のオブジェクトを返します。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 13, 0, 0);
System.out.println(dateTime); // 2100-04-13T00:00

final var ret1 = dateTime.minus(1, ChronoUnit.YEARS);
System.out.println(ret1); // 2099-04-13T00:00

final var ret2 = dateTime.minus(2, ChronoUnit.MONTHS);
System.out.println(ret2); // 2100-02-13T00:00

final var ret3 = dateTime.minus(3, ChronoUnit.DAYS);
System.out.println(ret3); // 2100-04-10T00:00

final ChronoLocalDateTime<LocalDate> dateTime =
        LocalDateTime.of(2100, 1, 1, 10, 20, 30, 123);
System.out.println(dateTime); // 2100-01-01T10:20:30.000000123

final var ret1 = dateTime.minus(1, ChronoUnit.HOURS);
System.out.println(ret1); // 2100-01-01T09:20:30.000000123

final var ret2 = dateTime.minus(2, ChronoUnit.MINUTES);
System.out.println(ret2); // 2100-01-01T10:18:30.000000123

final var ret3 = dateTime.minus(3, ChronoUnit.SECONDS);
System.out.println(ret3); // 2100-01-01T10:20:27.000000123

final var ret4 = dateTime.minus(4, ChronoUnit.NANOS);
System.out.println(ret4); // 2100-01-01T10:20:30.000000119

default ChronoLocalDateTime<D> minus (TemporalAmount amount)

量を減算して、このオブジェクトと同じ型のオブジェクトを返します。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 13, 0, 0);
System.out.println(dateTime); // 2100-04-13T00:00

final var ret1 = dateTime.minus(Period.ofYears(1));
System.out.println(ret1); // 2099-04-13T00:00

final var ret2 = dateTime.minus(Period.ofMonths(2));
System.out.println(ret2); // 2100-02-13T00:00

final var ret3 = dateTime.minus(Period.ofDays(3));
System.out.println(ret3); // 2100-04-10T00:00

final ChronoLocalDateTime<LocalDate> dateTime =
        LocalDateTime.of(2100, 1, 1, 10, 20, 30, 123);
System.out.println(dateTime); // 2100-01-01T10:20:30.000000123

final var ret1 = dateTime.minus(Duration.ofHours(1));
System.out.println(ret1); // 2100-01-01T09:20:30.000000123

final var ret2 = dateTime.minus(Duration.ofMinutes(2));
System.out.println(ret2); // 2100-01-01T10:18:30.000000123

final var ret3 = dateTime.minus(Duration.ofSeconds(3));
System.out.println(ret3); // 2100-01-01T10:20:27.000000123

final var ret4 = dateTime.minus(Duration.ofNanos(4));
System.out.println(ret4); // 2100-01-01T10:20:30.000000119

ChronoLocalDateTime<D> plus (long amountToAdd, TemporalUnit unit)

指定された期間を追加して、このオブジェクトと同じ型のオブジェクトを返します。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 13, 0, 0);
System.out.println(dateTime); // 2100-04-13T00:00

final var ret1 = dateTime.plus(1, ChronoUnit.YEARS);
System.out.println(ret1); // 2101-04-13T00:00

final var ret2 = dateTime.plus(2, ChronoUnit.MONTHS);
System.out.println(ret2); // 2100-06-13T00:00

final var ret3 = dateTime.plus(3, ChronoUnit.DAYS);
System.out.println(ret3); // 2100-04-16T00:00

final ChronoLocalDateTime<LocalDate> dateTime =
        LocalDateTime.of(2100, 1, 1, 10, 20, 30, 123);
System.out.println(dateTime); // 2100-01-01T10:20:30.000000123

final var ret1 = dateTime.plus(1, ChronoUnit.HOURS);
System.out.println(ret1); // 2100-01-01T11:20:30.000000123

final var ret2 = dateTime.plus(2, ChronoUnit.MINUTES);
System.out.println(ret2); // 2100-01-01T10:22:30.000000123

final var ret3 = dateTime.plus(3, ChronoUnit.SECONDS);
System.out.println(ret3); // 2100-01-01T10:20:33.000000123

final var ret4 = dateTime.plus(4, ChronoUnit.NANOS);
System.out.println(ret4); // 2100-01-01T10:20:30.000000127

default ChronoLocalDateTime<D> plus (TemporalAmount amount)

ある時間を追加して、このオブジェクトと同じ型のオブジェクトを返します。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 13, 0, 0);
System.out.println(dateTime); // 2100-04-13T00:00

final var ret1 = dateTime.plus(Period.ofYears(1));
System.out.println(ret1); // 2101-04-13T00:00

final var ret2 = dateTime.plus(Period.ofMonths(2));
System.out.println(ret2); // 2100-06-13T00:00

final var ret3 = dateTime.plus(Period.ofDays(3));
System.out.println(ret3); // 2100-04-16T00:00

final ChronoLocalDateTime<LocalDate> dateTime =
        LocalDateTime.of(2100, 1, 1, 10, 20, 30, 123);
System.out.println(dateTime); // 2100-01-01T10:20:30.000000123

final var ret1 = dateTime.plus(Duration.ofHours(1));
System.out.println(ret1); // 2100-01-01T11:20:30.000000123

final var ret2 = dateTime.plus(Duration.ofMinutes(2));
System.out.println(ret2); // 2100-01-01T10:22:30.000000123

final var ret3 = dateTime.plus(Duration.ofSeconds(3));
System.out.println(ret3); // 2100-01-01T10:20:33.000000123

final var ret4 = dateTime.plus(Duration.ofNanos(4));
System.out.println(ret4); // 2100-01-01T10:20:30.000000127

default <R> R query (TemporalQuery<R> query)

指定された問合せを使用してこの日付/時間を問い合わせます。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 10, 13, 30);
System.out.println(dateTime); // 2100-04-10T13:30
System.out.println(dateTime.query(TemporalQueries.precision())); // Nanos

static Comparator<ChronoLocalDateTime<?>> timeLineOrder ()

暦を無視して時系列順にChronoLocalDateTimeを比較するコンパレータを取得します。

final ChronoLocalDateTime<LocalDate> dateTime1 = LocalDateTime.of(2100, 1, 1, 0, 0);
final ChronoLocalDateTime<LocalDate> dateTime2 = LocalDateTime.of(2099, 12, 31, 0, 0);

System.out.println(dateTime1); // 2100-01-01T00:00
System.out.println(dateTime2); // 2099-12-31T00:00
System.out.println(dateTime1.compareTo(dateTime2)); // 1

final var comparator = ChronoLocalDateTime.timeLineOrder();
System.out.println(comparator.compare(dateTime1, dateTime2)); // 1

default long toEpochSecond (ZoneOffset offset)

この日付/時間を、エポック(1970-01-01T00:00:00Z)からの秒数に変換します。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 8, 12, 30);
System.out.println(dateTime); // 2100-04-08T12:30

final long epochSecond1 = dateTime.toEpochSecond(ZoneOffset.UTC);
System.out.println(epochSecond1); // 4110870600
System.out.println(Instant.ofEpochSecond(epochSecond1)); // 2100-04-08T12:30:00Z

final long epochSecond2 = dateTime.toEpochSecond(ZoneOffset.ofHours(9));
System.out.println(epochSecond2); // 4110838200
System.out.println(Instant.ofEpochSecond(epochSecond2)); // 2100-04-08T03:30:00Z

default Instant toInstant (ZoneOffset offset)

この日付/時間をInstantに変換します。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 8, 12, 30);
System.out.println(dateTime); // 2100-04-08T12:30

final var instant1 = dateTime.toInstant(ZoneOffset.UTC);
System.out.println(instant1); // 2100-04-08T12:30:00Z

final var instant2 = dateTime.toInstant(ZoneOffset.ofHours(9));
System.out.println(instant2); // 2100-04-08T03:30:00Z

D toLocalDate ()

この日付/時間のローカル日付部分を取得します。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 14, 12, 30);
System.out.println(dateTime); // 2100-04-14T12:30
System.out.println(dateTime.toLocalDate()); // 2100-04-14

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(1800, 1, 1, 0, 0);
System.out.println(dateTime); // 1800-01-01T00:00
System.out.println(dateTime.toLocalDate()); // 1800-01-01

LocalTime toLocalTime ()

この日付/時間のローカル・タイム部分を取得します。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 1, 1, 2, 3, 4);
System.out.println(dateTime); // 2100-01-01T02:03:04
System.out.println(dateTime.toLocalTime()); // 02:03:04

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(1800, 1, 1, 0, 0);
System.out.println(dateTime); // 1800-01-01T00:00
System.out.println(dateTime.toLocalTime()); // 00:00

String toString ()

この日付/時間をStringとして出力します。

final ChronoLocalDateTime<LocalDate> dateTime =
        LocalDateTime.of(2100, 4, 14, 13, 30, 45);
final var str = dateTime.toString();
System.out.println(str); // 2100-04-14T13:30:45

final ChronoLocalDateTime<LocalDate> dateTime =
        LocalDateTime.of(1800, 1, 1, 0, 0, 0, 123456789);
final var str = dateTime.toString();
System.out.println(str); // 1800-01-01T00:00:00.123456789

default ChronoLocalDateTime<D> with (TemporalAdjuster adjuster)

調整を行って、このオブジェクトと同じ型の調整済オブジェクトを返します。

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 3, 15, 0, 0);
System.out.println(dateTime); // 2100-03-15T00:00

final var ret1 = dateTime.with(TemporalAdjusters.firstDayOfMonth());
System.out.println(ret1); // 2100-03-01T00:00

final var ret2 = dateTime.with(TemporalAdjusters.lastDayOfMonth());
System.out.println(ret2); // 2100-03-31T00:00

final ChronoLocalDateTime<LocalDate> dateTime = LocalDateTime.of(2100, 4, 14, 12, 30);
System.out.println(dateTime); // 2100-04-14T12:30

System.out.println(dateTime.with(Year.of(1999))); // 1999-04-14T12:30
System.out.println(dateTime.with(Month.JANUARY)); // 2100-01-14T12:30
System.out.println(dateTime.with(LocalTime.MAX)); // 2100-04-14T23:59:59.999999999
System.out.println(dateTime.with(LocalDate.MIN)); // -999999999-01-01T12:30

ChronoLocalDateTime<D> with (TemporalField field, long newValue)

指定されたフィールドを変更して、このオブジェクトと同じ型のオブジェクトを返します。

final ChronoLocalDateTime<LocalDate> dateTime =
        LocalDateTime.of(2100, 1, 2, 12, 30, 45, 123);
System.out.println(dateTime); // 2100-01-02T12:30:45.000000123

final var ret1 = dateTime.with(ChronoField.YEAR, 1999);
System.out.println(ret1); // 1999-01-02T12:30:45.000000123

final var ret2 = dateTime.with(ChronoField.MONTH_OF_YEAR, 12);
System.out.println(ret2); // 2100-12-02T12:30:45.000000123

final var ret3 = dateTime.with(ChronoField.DAY_OF_MONTH, 30);
System.out.println(ret3); // 2100-01-30T12:30:45.000000123

final var ret4 = dateTime.with(ChronoField.HOUR_OF_DAY, 23);
System.out.println(ret4); // 2100-01-02T23:30:45.000000123

final var ret5 = dateTime.with(ChronoField.MINUTE_OF_HOUR, 59);
System.out.println(ret5); // 2100-01-02T12:59:45.000000123

final var ret6 = dateTime.with(ChronoField.SECOND_OF_MINUTE, 0);
System.out.println(ret6); // 2100-01-02T12:30:00.000000123

final var ret7 = dateTime.with(ChronoField.NANO_OF_SECOND, 456);
System.out.println(ret7); // 2100-01-02T12:30:45.000000456

until

「Java API 使用例 : Temporal」をご参照ください。

get, getLong, range

「Java API 使用例 : TemporalAccessor」をご参照ください。