Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) Summary: [Methods](https://developer.android.com/reference/java/time/chrono/JapaneseDate#pubmethods) \| [Inherited Methods](https://developer.android.com/reference/java/time/chrono/JapaneseDate#inhmethods)
# JapaneseDate
`
public
final
class
JapaneseDate
`
`
extends https://developer.android.com/reference/java/lang/Object
`
`
implements
https://developer.android.com/reference/java/time/chrono/ChronoLocalDate,
https://developer.android.com/reference/java/io/Serializable,
https://developer.android.com/reference/java/time/temporal/Temporal,
https://developer.android.com/reference/java/time/temporal/TemporalAdjuster
`
|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||
| ↳ | java.time.chrono.JapaneseDate |
*** ** * ** ***
A date in the Japanese Imperial calendar system.
This date operates using the [Japanese Imperial calendar](https://developer.android.com/reference/java/time/chrono/JapaneseChronology).
This calendar system is primarily used in Japan.
The Japanese Imperial calendar system is the same as the ISO calendar system
apart from the era-based year numbering. The proleptic-year is defined to be
equal to the ISO proleptic-year.
Japan introduced the Gregorian calendar starting with Meiji 6.
Only Meiji and later eras are supported;
dates before Meiji 6, January 1 are not supported.
For example, the Japanese year "Heisei 24" corresponds to ISO year "2012".
Calling `japaneseDate.get(YEAR_OF_ERA)` will return 24.
Calling `japaneseDate.get(YEAR)` will return 2012.
Calling `japaneseDate.get(ERA)` will return 2, corresponding to
`JapaneseChronology.ERA_HEISEI`.
This is a [value-based](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/doc-files/ValueBased.html)
class; programmers should treat instances that are
[equal](https://developer.android.com/reference/java/time/chrono/JapaneseDate#equals(java.lang.Object)) as interchangeable and should not
use instances for synchronization, or unpredictable behavior may
occur. For example, in a future release, synchronization may fail.
The `equals` method should be used for comparisons.
## Summary
| ### Public methods ||
|---|---|
| ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDateTime` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#atTime(java.time.LocalTime)(https://developer.android.com/reference/java/time/LocalTime localTime) ` Combines this date with a time to create a `ChronoLocalDateTime`. |
| ` boolean` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Compares this date to another date, including the chronology. |
| ` static https://developer.android.com/reference/java/time/chrono/JapaneseDate` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#from(java.time.temporal.TemporalAccessor)(https://developer.android.com/reference/java/time/temporal/TemporalAccessor temporal) ` Obtains a `JapaneseDate` from a temporal object. |
| ` https://developer.android.com/reference/java/time/chrono/JapaneseChronology` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#getChronology()() ` Gets the chronology of this date, which is the Japanese calendar system. |
| ` https://developer.android.com/reference/java/time/chrono/JapaneseEra` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#getEra()() ` Gets the era applicable at this date. |
| ` long` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#getLong(java.time.temporal.TemporalField)(https://developer.android.com/reference/java/time/temporal/TemporalField field) ` Gets the value of the specified field as a `long`. |
| ` int` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#hashCode()() ` A hash code for this date. |
| ` boolean` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#isSupported(java.time.temporal.TemporalField)(https://developer.android.com/reference/java/time/temporal/TemporalField field) ` Checks if the specified field is supported. |
| ` int` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#lengthOfMonth()() ` Returns the length of the month represented by this date. |
| ` int` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#lengthOfYear()() ` Returns the length of the year represented by this date, as defined by the calendar system. |
| ` https://developer.android.com/reference/java/time/chrono/JapaneseDate` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#minus(java.time.temporal.TemporalAmount)(https://developer.android.com/reference/java/time/temporal/TemporalAmount amount) ` Returns an object of the same type as this object with an amount subtracted. |
| ` https://developer.android.com/reference/java/time/chrono/JapaneseDate` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#minus(long,%20java.time.temporal.TemporalUnit)(long amountToSubtract, https://developer.android.com/reference/java/time/temporal/TemporalUnit unit) ` Returns an object of the same type as this object with the specified period subtracted. |
| ` static https://developer.android.com/reference/java/time/chrono/JapaneseDate` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#now(java.time.ZoneId)(https://developer.android.com/reference/java/time/ZoneId zone) ` Obtains the current `JapaneseDate` from the system clock in the specified time-zone. |
| ` static https://developer.android.com/reference/java/time/chrono/JapaneseDate` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#now()() ` Obtains the current `JapaneseDate` from the system clock in the default time-zone. |
| ` static https://developer.android.com/reference/java/time/chrono/JapaneseDate` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#now(java.time.Clock)(https://developer.android.com/reference/java/time/Clock clock) ` Obtains the current `JapaneseDate` from the specified clock. |
| ` static https://developer.android.com/reference/java/time/chrono/JapaneseDate` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#of(java.time.chrono.JapaneseEra,%20int,%20int,%20int)(https://developer.android.com/reference/java/time/chrono/JapaneseEra era, int yearOfEra, int month, int dayOfMonth) ` Obtains a `JapaneseDate` representing a date in the Japanese calendar system from the era, year-of-era, month-of-year and day-of-month fields. |
| ` static https://developer.android.com/reference/java/time/chrono/JapaneseDate` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#of(int,%20int,%20int)(int prolepticYear, int month, int dayOfMonth) ` Obtains a `JapaneseDate` representing a date in the Japanese calendar system from the proleptic-year, month-of-year and day-of-month fields. |
| ` https://developer.android.com/reference/java/time/chrono/JapaneseDate` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#plus(java.time.temporal.TemporalAmount)(https://developer.android.com/reference/java/time/temporal/TemporalAmount amount) ` Returns an object of the same type as this object with an amount added. |
| ` https://developer.android.com/reference/java/time/chrono/JapaneseDate` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#plus(long,%20java.time.temporal.TemporalUnit)(long amountToAdd, https://developer.android.com/reference/java/time/temporal/TemporalUnit unit) ` Returns an object of the same type as this object with the specified period added. |
| ` https://developer.android.com/reference/java/time/temporal/ValueRange` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#range(java.time.temporal.TemporalField)(https://developer.android.com/reference/java/time/temporal/TemporalField field) ` Gets the range of valid values for the specified field. |
| ` long` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#toEpochDay()() ` Converts this date to the Epoch Day. |
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#toString()() ` Returns a string representation of the object. |
| ` long` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#until(java.time.temporal.Temporal,%20java.time.temporal.TemporalUnit)(https://developer.android.com/reference/java/time/temporal/Temporal endExclusive, https://developer.android.com/reference/java/time/temporal/TemporalUnit unit) ` Calculates the amount of time until another date in terms of the specified unit. |
| ` https://developer.android.com/reference/java/time/chrono/ChronoPeriod` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#until(java.time.chrono.ChronoLocalDate)(https://developer.android.com/reference/java/time/chrono/ChronoLocalDate endDate) ` Calculates the period between this date and another date as a `ChronoPeriod`. |
| ` https://developer.android.com/reference/java/time/chrono/JapaneseDate` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#with(java.time.temporal.TemporalField,%20long)(https://developer.android.com/reference/java/time/temporal/TemporalField field, long newValue) ` Returns an object of the same type as this object with the specified field altered. |
| ` https://developer.android.com/reference/java/time/chrono/JapaneseDate` | ` https://developer.android.com/reference/java/time/chrono/JapaneseDate#with(java.time.temporal.TemporalAdjuster)(https://developer.android.com/reference/java/time/temporal/TemporalAdjuster adjuster) ` Returns an adjusted object of the same type as this object with the adjustment made. |
| ### Inherited methods |
|---|---|
| From class ` https://developer.android.com/reference/java/lang/Object ` |---|---| | ` https://developer.android.com/reference/java/lang/Object` | ` https://developer.android.com/reference/java/lang/Object#clone()() ` Creates and returns a copy of this object. | | ` boolean` | ` https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Indicates whether some other object is "equal to" this one. | | ` void` | ` https://developer.android.com/reference/java/lang/Object#finalize()() ` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. | | ` final https://developer.android.com/reference/java/lang/Class` | ` https://developer.android.com/reference/java/lang/Object#getClass()() ` Returns the runtime class of this `Object`. | | ` int` | ` https://developer.android.com/reference/java/lang/Object#hashCode()() ` Returns a hash code value for the object. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#notify()() ` Wakes up a single thread that is waiting on this object's monitor. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#notifyAll()() ` Wakes up all threads that are waiting on this object's monitor. | | ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/lang/Object#toString()() ` Returns a string representation of the object. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#wait(long,%20int)(long timeoutMillis, int nanos) ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#wait(long)(long timeoutMillis) ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#wait()() ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*. | ||
| From interface ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate ` |---|---| | ` default https://developer.android.com/reference/java/time/temporal/Temporal` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#adjustInto(java.time.temporal.Temporal)(https://developer.android.com/reference/java/time/temporal/Temporal temporal) ` Adjusts the specified temporal object to have the same date as this object. | | ` default https://developer.android.com/reference/java/time/chrono/ChronoLocalDateTime` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#atTime(java.time.LocalTime)(https://developer.android.com/reference/java/time/LocalTime localTime) ` Combines this date with a time to create a `ChronoLocalDateTime`. | | ` default int` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#compareTo(java.time.chrono.ChronoLocalDate)(https://developer.android.com/reference/java/time/chrono/ChronoLocalDate other) ` Compares this date to another date, including the chronology. | | ` abstract boolean` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Checks if this date is equal to another date, including the chronology. | | ` default https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#format(java.time.format.DateTimeFormatter)(https://developer.android.com/reference/java/time/format/DateTimeFormatter formatter) ` Formats this date using the specified formatter. | | ` static https://developer.android.com/reference/java/time/chrono/ChronoLocalDate` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#from(java.time.temporal.TemporalAccessor)(https://developer.android.com/reference/java/time/temporal/TemporalAccessor temporal) ` Obtains an instance of `ChronoLocalDate` from a temporal object. | | ` abstract https://developer.android.com/reference/java/time/chrono/Chronology` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#getChronology()() ` Gets the chronology of this date. | | ` default https://developer.android.com/reference/java/time/chrono/Era` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#getEra()() ` Gets the era, as defined by the chronology. | | ` abstract int` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#hashCode()() ` A hash code for this date. | | ` default boolean` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#isAfter(java.time.chrono.ChronoLocalDate)(https://developer.android.com/reference/java/time/chrono/ChronoLocalDate other) ` Checks if this date is after the specified date ignoring the chronology. | | ` default boolean` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#isBefore(java.time.chrono.ChronoLocalDate)(https://developer.android.com/reference/java/time/chrono/ChronoLocalDate other) ` Checks if this date is before the specified date ignoring the chronology. | | ` default boolean` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#isEqual(java.time.chrono.ChronoLocalDate)(https://developer.android.com/reference/java/time/chrono/ChronoLocalDate other) ` Checks if this date is equal to the specified date ignoring the chronology. | | ` default boolean` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#isLeapYear()() ` Checks if the year is a leap year, as defined by the calendar system. | | ` default boolean` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#isSupported(java.time.temporal.TemporalUnit)(https://developer.android.com/reference/java/time/temporal/TemporalUnit unit) ` Checks if the specified unit is supported. | | ` default boolean` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#isSupported(java.time.temporal.TemporalField)(https://developer.android.com/reference/java/time/temporal/TemporalField field) ` Checks if the specified field is supported. | | ` abstract int` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#lengthOfMonth()() ` Returns the length of the month represented by this date, as defined by the calendar system. | | ` default int` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#lengthOfYear()() ` Returns the length of the year represented by this date, as defined by the calendar system. | | ` default https://developer.android.com/reference/java/time/chrono/ChronoLocalDate` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#minus(java.time.temporal.TemporalAmount)(https://developer.android.com/reference/java/time/temporal/TemporalAmount amount) ` Returns an object of the same type as this object with an amount subtracted. | | ` default https://developer.android.com/reference/java/time/chrono/ChronoLocalDate` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#minus(long,%20java.time.temporal.TemporalUnit)(long amountToSubtract, https://developer.android.com/reference/java/time/temporal/TemporalUnit unit) ` Returns an object of the same type as this object with the specified period subtracted. | | ` default https://developer.android.com/reference/java/time/chrono/ChronoLocalDate` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#plus(java.time.temporal.TemporalAmount)(https://developer.android.com/reference/java/time/temporal/TemporalAmount amount) ` Returns an object of the same type as this object with an amount added. | | ` default https://developer.android.com/reference/java/time/chrono/ChronoLocalDate` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#plus(long,%20java.time.temporal.TemporalUnit)(long amountToAdd, https://developer.android.com/reference/java/time/temporal/TemporalUnit unit) ` Returns an object of the same type as this object with the specified period added. | | ` default R` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#query(java.time.temporal.TemporalQuery)(https://developer.android.com/reference/java/time/temporal/TemporalQuery query) ` Queries this date using the specified query. | | ` static https://developer.android.com/reference/java/util/Comparator` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#timeLineOrder()() ` Gets a comparator that compares `ChronoLocalDate` in time-line order ignoring the chronology. | | ` default long` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#toEpochDay()() ` Converts this date to the Epoch Day. | | ` abstract https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#toString()() ` Outputs this date as a `String`. | | ` abstract long` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#until(java.time.temporal.Temporal,%20java.time.temporal.TemporalUnit)(https://developer.android.com/reference/java/time/temporal/Temporal endExclusive, https://developer.android.com/reference/java/time/temporal/TemporalUnit unit) ` Calculates the amount of time until another date in terms of the specified unit. | | ` abstract https://developer.android.com/reference/java/time/chrono/ChronoPeriod` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#until(java.time.chrono.ChronoLocalDate)(https://developer.android.com/reference/java/time/chrono/ChronoLocalDate endDateExclusive) ` Calculates the period between this date and another date as a `ChronoPeriod`. | | ` default https://developer.android.com/reference/java/time/chrono/ChronoLocalDate` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#with(java.time.temporal.TemporalField,%20long)(https://developer.android.com/reference/java/time/temporal/TemporalField field, long newValue) ` Returns an object of the same type as this object with the specified field altered. | | ` default https://developer.android.com/reference/java/time/chrono/ChronoLocalDate` | ` https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#with(java.time.temporal.TemporalAdjuster)(https://developer.android.com/reference/java/time/temporal/TemporalAdjuster adjuster) ` Returns an adjusted object of the same type as this object with the adjustment made. | ||
| From interface ` https://developer.android.com/reference/java/time/temporal/Temporal ` |---|---| | ` abstract boolean` | ` https://developer.android.com/reference/java/time/temporal/Temporal#isSupported(java.time.temporal.TemporalUnit)(https://developer.android.com/reference/java/time/temporal/TemporalUnit unit) ` Checks if the specified unit is supported. | | ` default https://developer.android.com/reference/java/time/temporal/Temporal` | ` https://developer.android.com/reference/java/time/temporal/Temporal#minus(java.time.temporal.TemporalAmount)(https://developer.android.com/reference/java/time/temporal/TemporalAmount amount) ` Returns an object of the same type as this object with an amount subtracted. | | ` default https://developer.android.com/reference/java/time/temporal/Temporal` | ` https://developer.android.com/reference/java/time/temporal/Temporal#minus(long,%20java.time.temporal.TemporalUnit)(long amountToSubtract, https://developer.android.com/reference/java/time/temporal/TemporalUnit unit) ` Returns an object of the same type as this object with the specified period subtracted. | | ` abstract https://developer.android.com/reference/java/time/temporal/Temporal` | ` https://developer.android.com/reference/java/time/temporal/Temporal#plus(long,%20java.time.temporal.TemporalUnit)(long amountToAdd, https://developer.android.com/reference/java/time/temporal/TemporalUnit unit) ` Returns an object of the same type as this object with the specified period added. | | ` default https://developer.android.com/reference/java/time/temporal/Temporal` | ` https://developer.android.com/reference/java/time/temporal/Temporal#plus(java.time.temporal.TemporalAmount)(https://developer.android.com/reference/java/time/temporal/TemporalAmount amount) ` Returns an object of the same type as this object with an amount added. | | ` abstract long` | ` https://developer.android.com/reference/java/time/temporal/Temporal#until(java.time.temporal.Temporal,%20java.time.temporal.TemporalUnit)(https://developer.android.com/reference/java/time/temporal/Temporal endExclusive, https://developer.android.com/reference/java/time/temporal/TemporalUnit unit) ` Calculates the amount of time until another temporal in terms of the specified unit. | | ` abstract https://developer.android.com/reference/java/time/temporal/Temporal` | ` https://developer.android.com/reference/java/time/temporal/Temporal#with(java.time.temporal.TemporalField,%20long)(https://developer.android.com/reference/java/time/temporal/TemporalField field, long newValue) ` Returns an object of the same type as this object with the specified field altered. | | ` default https://developer.android.com/reference/java/time/temporal/Temporal` | ` https://developer.android.com/reference/java/time/temporal/Temporal#with(java.time.temporal.TemporalAdjuster)(https://developer.android.com/reference/java/time/temporal/TemporalAdjuster adjuster) ` Returns an adjusted object of the same type as this object with the adjustment made. | ||
| From interface ` https://developer.android.com/reference/java/time/temporal/TemporalAdjuster ` |---|---| | ` abstract https://developer.android.com/reference/java/time/temporal/Temporal` | ` https://developer.android.com/reference/java/time/temporal/TemporalAdjuster#adjustInto(java.time.temporal.Temporal)(https://developer.android.com/reference/java/time/temporal/Temporal temporal) ` Adjusts the specified temporal object. | ||
| From interface ` https://developer.android.com/reference/java/lang/Comparable ` |---|---| | ` abstract int` | ` https://developer.android.com/reference/java/lang/Comparable#compareTo(T)(https://developer.android.com/reference/java/time/chrono/ChronoLocalDate o) ` Compares this object with the specified object for order. | ||
| From interface ` https://developer.android.com/reference/java/time/temporal/TemporalAccessor ` |---|---| | ` default int` | ` https://developer.android.com/reference/java/time/temporal/TemporalAccessor#get(java.time.temporal.TemporalField)(https://developer.android.com/reference/java/time/temporal/TemporalField field) ` Gets the value of the specified field as an `int`. | | ` abstract long` | ` https://developer.android.com/reference/java/time/temporal/TemporalAccessor#getLong(java.time.temporal.TemporalField)(https://developer.android.com/reference/java/time/temporal/TemporalField field) ` Gets the value of the specified field as a `long`. | | ` abstract boolean` | ` https://developer.android.com/reference/java/time/temporal/TemporalAccessor#isSupported(java.time.temporal.TemporalField)(https://developer.android.com/reference/java/time/temporal/TemporalField field) ` Checks if the specified field is supported. | | ` default R` | ` https://developer.android.com/reference/java/time/temporal/TemporalAccessor#query(java.time.temporal.TemporalQuery)(https://developer.android.com/reference/java/time/temporal/TemporalQuery query) ` Queries this date-time. | | ` default https://developer.android.com/reference/java/time/temporal/ValueRange` | ` https://developer.android.com/reference/java/time/temporal/TemporalAccessor#range(java.time.temporal.TemporalField)(https://developer.android.com/reference/java/time/temporal/TemporalField field) ` Gets the range of valid values for the specified field. | ||
## Public methods
### atTime
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public ChronoLocalDateTime atTime (LocalTime localTime)
```
Combines this date with a time to create a `ChronoLocalDateTime`.
This returns a `ChronoLocalDateTime` formed from this date at the specified time.
All possible combinations of date and time are valid.
| Parameters ||
|---|---|
| `localTime` | `LocalTime`: the local time to use, not null
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/ChronoLocalDateTime` | the local date-time formed from this date and the specified time, not null
|
### equals
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public boolean equals (Object obj)
```
Compares this date to another date, including the chronology.
Compares this `JapaneseDate` with another ensuring that the date is the same.
Only objects of type `JapaneseDate` are compared, other types return false.
To compare the dates of two `TemporalAccessor` instances, including dates
in two different chronologies, use `https://developer.android.com/reference/java/time/temporal/ChronoField#EPOCH_DAY` as a comparator.
| Parameters ||
|---|---|
| `obj` | `Object`: the object to check, null returns false
|
| Returns ||
|---|---|
| `boolean` | true if this is equal to the other date
|
### from
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static JapaneseDate from (TemporalAccessor temporal)
```
Obtains a `JapaneseDate` from a temporal object.
This obtains a date in the Japanese calendar system based on the specified temporal.
A `TemporalAccessor` represents an arbitrary set of date and time information,
which this factory converts to an instance of `JapaneseDate`.
The conversion typically uses the `https://developer.android.com/reference/java/time/temporal/ChronoField#EPOCH_DAY`
field, which is standardized across calendar systems.
This method matches the signature of the functional interface `https://developer.android.com/reference/java/time/temporal/TemporalQuery`
allowing it to be used as a query via method reference, `JapaneseDate::from`.
| Parameters ||
|---|---|
| `temporal` | `TemporalAccessor`: the temporal object to convert, not null
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseDate` | the date in Japanese calendar system, not null
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/time/DateTimeException` | if unable to convert to a `JapaneseDate` |
### getChronology
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public JapaneseChronology getChronology ()
```
Gets the chronology of this date, which is the Japanese calendar system.
The `Chronology` represents the calendar system in use.
The era and other fields in `https://developer.android.com/reference/java/time/temporal/ChronoField` are defined by the chronology.
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseChronology` | the Japanese chronology, not null
|
### getEra
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public JapaneseEra getEra ()
```
Gets the era applicable at this date.
The Japanese calendar system has multiple eras defined by `https://developer.android.com/reference/java/time/chrono/JapaneseEra`.
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseEra` | the era applicable at this date, not null
|
### getLong
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public long getLong (TemporalField field)
```
Gets the value of the specified field as a `long`.
This queries the date-time for the value of the specified field.
The returned value may be outside the valid range of values for the field.
If the date-time cannot return the value, because the field is unsupported or for
some other reason, an exception will be thrown.
| Parameters ||
|---|---|
| `field` | `TemporalField`: the field to get, not null
|
| Returns ||
|---|---|
| `long` | the value for the field
|
### hashCode
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int hashCode ()
```
A hash code for this date.
| Returns ||
|---|---|
| `int` | a suitable hash code based only on the Chronology and the date
|
### isSupported
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public boolean isSupported (TemporalField field)
```
Checks if the specified field is supported.
This checks if this date can be queried for the specified field.
If false, then calling the `https://developer.android.com/reference/java/time/chrono/JapaneseDate#range(java.time.temporal.TemporalField)` and
`https://developer.android.com/reference/java/time/temporal/TemporalAccessor#get(java.time.temporal.TemporalField)` methods will throw an exception.
If the field is a `https://developer.android.com/reference/java/time/temporal/ChronoField` then the query is implemented here.
The supported fields are:
- `DAY_OF_WEEK`
- `DAY_OF_MONTH`
- `DAY_OF_YEAR`
- `EPOCH_DAY`
- `MONTH_OF_YEAR`
- `PROLEPTIC_MONTH`
- `YEAR_OF_ERA`
- `YEAR`
- `ERA`
All other `ChronoField` instances will return false.
If the field is not a `ChronoField`, then the result of this method
is obtained by invoking `TemporalField.isSupportedBy(TemporalAccessor)`
passing `this` as the argument.
Whether the field is supported is determined by the field.
| Parameters ||
|---|---|
| `field` | `TemporalField`: the field to check, null returns false
|
| Returns ||
|---|---|
| `boolean` | true if the field is supported on this date, false if not
|
### lengthOfMonth
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int lengthOfMonth ()
```
Returns the length of the month represented by this date.
This returns the length of the month in days.
Month lengths match those of the ISO calendar system.
| Returns ||
|---|---|
| `int` | the length of the month in days
|
### lengthOfYear
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int lengthOfYear ()
```
Returns the length of the year represented by this date, as defined by the calendar system.
This returns the length of the year in days.
The default implementation uses `https://developer.android.com/reference/java/time/chrono/ChronoLocalDate#isLeapYear()` and returns 365 or 366.
| Returns ||
|---|---|
| `int` | the length of the year in days
|
### minus
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public JapaneseDate minus (TemporalAmount amount)
```
Returns an object of the same type as this object with an amount subtracted.
This adjusts this temporal, subtracting according to the rules of the specified amount.
The amount is typically a `https://developer.android.com/reference/java/time/Period` but may be any other type implementing
the `https://developer.android.com/reference/java/time/temporal/TemporalAmount` interface, such as `https://developer.android.com/reference/java/time/Duration`.
Some example code indicating how and why this method is used:
```
date = date.minus(period); // subtract a Period instance
date = date.minus(duration); // subtract a Duration instance
date = date.minus(workingDays(6)); // example user-written workingDays method
```
Note that calling `plus` followed by `minus` is not guaranteed to
return the same date-time.
| Parameters ||
|---|---|
| `amount` | `TemporalAmount`: the amount to subtract, not null
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseDate` | an object of the same type with the specified adjustment made, not null
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ArithmeticException` | |
| `https://developer.android.com/reference/java/time/DateTimeException` | |
### minus
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public JapaneseDate minus (long amountToSubtract,
TemporalUnit unit)
```
Returns an object of the same type as this object with the specified period subtracted.
This method returns a new object based on this one with the specified period subtracted.
For example, on a `LocalDate`, this could be used to subtract a number of years, months or days.
The returned object will have the same observable type as this object.
In some cases, changing a field is not fully defined. For example, if the target object is
a date representing the 31st March, then subtracting one month would be unclear.
In cases like this, the field is responsible for resolving the result. Typically it will choose
the previous valid date, which would be the last valid day of February in this example.
| Parameters ||
|---|---|
| `amountToSubtract` | `long`: the amount of the specified unit to subtract, may be negative
|
| `unit` | `TemporalUnit`: the unit of the amount to subtract, not null
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseDate` | an object of the same type with the specified period subtracted, not null
|
### now
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static JapaneseDate now (ZoneId zone)
```
Obtains the current `JapaneseDate` from the system clock in the specified time-zone.
This will query the `https://developer.android.com/reference/java/time/Clock#system(java.time.ZoneId)` to obtain the current date.
Specifying the time-zone avoids dependence on the default time-zone.
Using this method will prevent the ability to use an alternate clock for testing
because the clock is hard-coded.
| Parameters ||
|---|---|
| `zone` | `ZoneId`: the zone ID to use, not null
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseDate` | the current date using the system clock, not null
|
### now
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static JapaneseDate now ()
```
Obtains the current `JapaneseDate` from the system clock in the default time-zone.
This will query the `https://developer.android.com/reference/java/time/Clock#systemDefaultZone()` in the default
time-zone to obtain the current date.
Using this method will prevent the ability to use an alternate clock for testing
because the clock is hard-coded.
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseDate` | the current date using the system clock and default time-zone, not null
|
### now
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static JapaneseDate now (Clock clock)
```
Obtains the current `JapaneseDate` from the specified clock.
This will query the specified clock to obtain the current date - today.
Using this method allows the use of an alternate clock for testing.
The alternate clock may be introduced using [dependency injection](https://developer.android.com/reference/java/time/Clock).
| Parameters ||
|---|---|
| `clock` | `Clock`: the clock to use, not null
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseDate` | the current date, not null
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/time/DateTimeException` | if the current date cannot be obtained |
### of
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static JapaneseDate of (JapaneseEra era,
int yearOfEra,
int month,
int dayOfMonth)
```
Obtains a `JapaneseDate` representing a date in the Japanese calendar
system from the era, year-of-era, month-of-year and day-of-month fields.
This returns a `JapaneseDate` with the specified fields.
The day must be valid for the year and month, otherwise an exception will be thrown.
The Japanese month and day-of-month are the same as those in the
ISO calendar system. They are not reset when the era changes.
For example:
```
6th Jan Showa 64 = ISO 1989-01-06
7th Jan Showa 64 = ISO 1989-01-07
8th Jan Heisei 1 = ISO 1989-01-08
9th Jan Heisei 1 = ISO 1989-01-09
```
| Parameters ||
|---|---|
| `era` | `JapaneseEra`: the Japanese era, not null
|
| `yearOfEra` | `int`: the Japanese year-of-era
|
| `month` | `int`: the Japanese month-of-year, from 1 to 12
|
| `dayOfMonth` | `int`: the Japanese day-of-month, from 1 to 31
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseDate` | the date in Japanese calendar system, not null
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/time/DateTimeException` | if the value of any field is out of range, or if the day-of-month is invalid for the month-year, or if the date is not a Japanese era |
### of
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static JapaneseDate of (int prolepticYear,
int month,
int dayOfMonth)
```
Obtains a `JapaneseDate` representing a date in the Japanese calendar
system from the proleptic-year, month-of-year and day-of-month fields.
This returns a `JapaneseDate` with the specified fields.
The day must be valid for the year and month, otherwise an exception will be thrown.
The Japanese proleptic year, month and day-of-month are the same as those
in the ISO calendar system. They are not reset when the era changes.
| Parameters ||
|---|---|
| `prolepticYear` | `int`: the Japanese proleptic-year
|
| `month` | `int`: the Japanese month-of-year, from 1 to 12
|
| `dayOfMonth` | `int`: the Japanese day-of-month, from 1 to 31
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseDate` | the date in Japanese calendar system, not null
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/time/DateTimeException` | if the value of any field is out of range, or if the day-of-month is invalid for the month-year |
### plus
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public JapaneseDate plus (TemporalAmount amount)
```
Returns an object of the same type as this object with an amount added.
This adjusts this temporal, adding according to the rules of the specified amount.
The amount is typically a `https://developer.android.com/reference/java/time/Period` but may be any other type implementing
the `https://developer.android.com/reference/java/time/temporal/TemporalAmount` interface, such as `https://developer.android.com/reference/java/time/Duration`.
Some example code indicating how and why this method is used:
```
date = date.plus(period); // add a Period instance
date = date.plus(duration); // add a Duration instance
date = date.plus(workingDays(6)); // example user-written workingDays method
```
Note that calling `plus` followed by `minus` is not guaranteed to
return the same date-time.
| Parameters ||
|---|---|
| `amount` | `TemporalAmount`: the amount to add, not null
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseDate` | an object of the same type with the specified adjustment made, not null
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ArithmeticException` | |
| `https://developer.android.com/reference/java/time/DateTimeException` | |
### plus
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public JapaneseDate plus (long amountToAdd,
TemporalUnit unit)
```
Returns an object of the same type as this object with the specified period added.
This method returns a new object based on this one with the specified period added.
For example, on a `LocalDate`, this could be used to add a number of years, months or days.
The returned object will have the same observable type as this object.
In some cases, changing a field is not fully defined. For example, if the target object is
a date representing the 31st January, then adding one month would be unclear.
In cases like this, the field is responsible for resolving the result. Typically it will choose
the previous valid date, which would be the last valid day of February in this example.
| Parameters ||
|---|---|
| `amountToAdd` | `long`: the amount of the specified unit to add, may be negative
|
| `unit` | `TemporalUnit`: the unit of the amount to add, not null
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseDate` | an object of the same type with the specified period added, not null
|
### range
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public ValueRange range (TemporalField field)
```
Gets the range of valid values for the specified field.
All fields can be expressed as a `long` integer.
This method returns an object that describes the valid range for that value.
The value of this temporal object is used to enhance the accuracy of the returned range.
If the date-time cannot return the range, because the field is unsupported or for
some other reason, an exception will be thrown.
Note that the result only describes the minimum and maximum valid values
and it is important not to read too much into them. For example, there
could be values within the range that are invalid for the field.
| Parameters ||
|---|---|
| `field` | `TemporalField`: the field to query the range for, not null
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/temporal/ValueRange` | the range of valid values for the field, not null
|
### toEpochDay
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public long toEpochDay ()
```
Converts this date to the Epoch Day.
The `https://developer.android.com/reference/java/time/temporal/ChronoField#EPOCH_DAY` is a simple
incrementing count of days where day 0 is 1970-01-01 (ISO).
This definition is the same for all chronologies, enabling conversion.
This default implementation queries the `EPOCH_DAY` field.
| Returns ||
|---|---|
| `long` | the Epoch Day equivalent to this date
|
### toString
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public String toString ()
```
Returns a string representation of the object.
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | a string representation of the object.
|
### until
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public long until (Temporal endExclusive,
TemporalUnit unit)
```
Calculates the amount of time until another date in terms of the specified unit.
This calculates the amount of time between two `ChronoLocalDate`
objects in terms of a single `TemporalUnit`.
The start and end points are `this` and the specified date.
The result will be negative if the end is before the start.
The `Temporal` passed to this method is converted to a
`ChronoLocalDate` using `https://developer.android.com/reference/java/time/chrono/Chronology#date(java.time.temporal.TemporalAccessor)`.
The calculation returns a whole number, representing the number of
complete units between the two dates.
For example, the amount in days between two dates can be calculated
using `startDate.until(endDate, DAYS)`.
There are two equivalent ways of using this method.
The first is to invoke this method.
The second is to use `https://developer.android.com/reference/java/time/temporal/TemporalUnit#between(java.time.temporal.Temporal,%20java.time.temporal.Temporal)`:
```
// these two lines are equivalent
amount = start.until(end, MONTHS);
amount = MONTHS.between(start, end);
```
The choice should be made based on which makes the code more readable.
The calculation is implemented in this method for `https://developer.android.com/reference/java/time/temporal/ChronoUnit`.
The units `DAYS`, `WEEKS`, `MONTHS`, `YEARS`,
`DECADES`, `CENTURIES`, `MILLENNIA` and `ERAS`
should be supported by all implementations.
Other `ChronoUnit` values will throw an exception.
If the unit is not a `ChronoUnit`, then the result of this method
is obtained by invoking `TemporalUnit.between(Temporal, Temporal)`
passing `this` as the first argument and the converted input temporal as
the second argument.
This instance is immutable and unaffected by this method call.
| Parameters ||
|---|---|
| `endExclusive` | `Temporal`: the end date, exclusive, which is converted to a `ChronoLocalDate` in the same chronology, not null
|
| `unit` | `TemporalUnit`: the unit to measure the amount in, not null
|
| Returns ||
|---|---|
| `long` | the amount of time between this date and the end date
|
### until
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public ChronoPeriod until (ChronoLocalDate endDate)
```
Calculates the period between this date and another date as a `ChronoPeriod`.
This calculates the period between two dates. All supplied chronologies
calculate the period using years, months and days, however the
`ChronoPeriod` API allows the period to be represented using other units.
The start and end points are `this` and the specified date.
The result will be negative if the end is before the start.
The negative sign will be the same in each of year, month and day.
The calculation is performed using the chronology of this date.
If necessary, the input date will be converted to match.
This instance is immutable and unaffected by this method call.
| Parameters ||
|---|---|
| `endDate` | `ChronoLocalDate`: the end date, exclusive, which may be in any chronology, not null
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/ChronoPeriod` | the period between this date and the end date, not null
|
### with
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public JapaneseDate with (TemporalField field,
long newValue)
```
Returns an object of the same type as this object with the specified field altered.
This returns a new object based on this one with the value for the specified field changed.
For example, on a `LocalDate`, this could be used to set the year, month or day-of-month.
The returned object will have the same observable type as this object.
In some cases, changing a field is not fully defined. For example, if the target object is
a date representing the 31st January, then changing the month to February would be unclear.
In cases like this, the field is responsible for resolving the result. Typically it will choose
the previous valid date, which would be the last valid day of February in this example.
| Parameters ||
|---|---|
| `field` | `TemporalField`: the field to set in the result, not null
|
| `newValue` | `long`: the new value of the field in the result
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseDate` | an object of the same type with the specified field set, not null
|
### with
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public JapaneseDate with (TemporalAdjuster adjuster)
```
Returns an adjusted object of the same type as this object with the adjustment made.
This adjusts this date-time according to the rules of the specified adjuster.
A simple adjuster might simply set the one of the fields, such as the year field.
A more complex adjuster might set the date to the last day of the month.
A selection of common adjustments is provided in
`https://developer.android.com/reference/java/time/temporal/TemporalAdjusters`.
These include finding the "last day of the month" and "next Wednesday".
The adjuster is responsible for handling special cases, such as the varying
lengths of month and leap years.
Some example code indicating how and why this method is used:
```
date = date.with(Month.JULY); // most key classes implement TemporalAdjuster
date = date.with(lastDayOfMonth()); // static import from Adjusters
date = date.with(next(WEDNESDAY)); // static import from Adjusters and DayOfWeek
```
| Parameters ||
|---|---|
| `adjuster` | `TemporalAdjuster`: the adjuster to use, not null
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/time/chrono/JapaneseDate` | an object of the same type with the specified adjustment made, not null
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ArithmeticException` | |
| `https://developer.android.com/reference/java/time/DateTimeException` | |