Module java.base
Package java.time.chrono

## Class MinguoChronology

- java.lang.Object
- - java.time.chrono.AbstractChronology
  - - java.time.chrono.MinguoChronology

- All Implemented Interfaces:
    `Serializable`, `Comparable<Chronology>`, `Chronology`

      public final class MinguoChronology
      extends AbstractChronology
      implements Serializable

  The Minguo calendar system.

  This chronology defines the rules of the Minguo calendar system. This calendar system is primarily used in the Republic of China, often known as Taiwan. Dates are aligned such that `0001-01-01 (Minguo)` is `1912-01-01 (ISO)`.

  The fields are defined as follows:

  - era - There are two eras, the current 'Republic' (ERA_ROC) and the previous era (ERA_BEFORE_ROC).
  - year-of-era - The year-of-era for the current era increases uniformly from the epoch at year one. For the previous era the year increases from one as time goes backwards. The value for the current era is equal to the ISO proleptic-year minus 1911.
  - proleptic-year - The proleptic year is the same as the year-of-era for the current era. For the previous era, years have zero, then negative values. The value is equal to the ISO proleptic-year minus 1911.
  - month-of-year - The Minguo month-of-year exactly matches ISO.
  - day-of-month - The Minguo day-of-month exactly matches ISO.
  - day-of-year - The Minguo day-of-year exactly matches ISO.
  - leap-year - The Minguo leap-year pattern exactly matches ISO, such that the two calendars are never out of step.
  Implementation Requirements:
    This class is immutable and thread-safe.
  Since:
    1.8
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `static MinguoChronology` | `INSTANCE` | Singleton instance for the Minguo chronology.

  - ### Method Summary

    Modifier and Type | Method | Description
    --- | --- | ---
    `MinguoDate` | `date​(int prolepticYear, int month, int dayOfMonth)` | Obtains a local date in Minguo calendar system from the proleptic-year, month-of-year and day-of-month fields.
    `MinguoDate` | `date​(Era era, int yearOfEra, int month, int dayOfMonth)` | Obtains a local date in Minguo calendar system from the era, year-of-era, month-of-year and day-of-month fields.
    `MinguoDate` | `dateEpochDay​(long epochDay)` | Obtains a local date in the Minguo calendar system from the epoch-day.
    `MinguoDate` | `dateYearDay​(int prolepticYear, int dayOfYear)` | Obtains a local date in Minguo calendar system from the proleptic-year and day-of-year fields.
    `MinguoDate` | `dateYearDay​(Era era, int yearOfEra, int dayOfYear)` | Obtains a local date in Minguo calendar system from the era, year-of-era and day-of-year fields.
    `String` | `getCalendarType()` | Gets the calendar type of the underlying calendar system - 'roc'.
    `String` | `getId()` | Gets the ID of the chronology - 'Minguo'.
    `boolean` | `isLeapYear​(long prolepticYear)` | Checks if the specified year is a leap year.

    - ### Methods declared in class java.time.chrono.AbstractChronology

      `compareTo, equals, hashCode, resolveDate, toString`

    - ### Methods declared in class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

    - ### Methods declared in interface java.time.chrono.Chronology

      `date, dateNow, dateNow, dateNow, epochSecond, epochSecond, eraOf, eras, getDisplayName, localDateTime, period, prolepticYear, range, zonedDateTime, zonedDateTime`

- - ### Field Detail

    - #### INSTANCE

          public static final MinguoChronology INSTANCE

      Singleton instance for the Minguo chronology.

  - ### Method Detail

    - #### getId

          public String getId()

      Gets the ID of the chronology - 'Minguo'.

      The ID uniquely identifies the `Chronology`. It can be used to lookup the `Chronology` using `Chronology.of(String)`.

      Specified by:
        `getId` in interface `Chronology`
      Returns:
        the chronology ID - 'Minguo'
      See Also:
        `getCalendarType()`

    - #### getCalendarType

          public String getCalendarType()

      Gets the calendar type of the underlying calendar system - 'roc'.

      The calendar type is an identifier defined by the Unicode Locale Data Markup Language (LDML) specification. It can be used to lookup the `Chronology` using `Chronology.of(String)`. It can also be used as part of a locale, accessible via `Locale.getUnicodeLocaleType(String)` with the key 'ca'.

      Specified by:
        `getCalendarType` in interface `Chronology`
      Returns:
        the calendar system type - 'roc'
      See Also:
        `getId()`

    - #### date

          public MinguoDate date​(Era era,
                                 int yearOfEra,
                                 int month,
                                 int dayOfMonth)

      Obtains a local date in Minguo calendar system from the era, year-of-era, month-of-year and day-of-month fields.
      Specified by:
        `date` in interface `Chronology`
      Parameters:
        `era` - the Minguo era, not null
        `yearOfEra` - the year-of-era
        `month` - the month-of-year
        `dayOfMonth` - the day-of-month
      Returns:
        the Minguo local date, not null
      Throws:
        `DateTimeException` - if unable to create the date
        `ClassCastException` - if the `era` is not a `MinguoEra`

    - #### date

          public MinguoDate date​(int prolepticYear,
                                 int month,
                                 int dayOfMonth)

      Obtains a local date in Minguo calendar system from the proleptic-year, month-of-year and day-of-month fields.
      Specified by:
        `date` in interface `Chronology`
      Parameters:
        `prolepticYear` - the proleptic-year
        `month` - the month-of-year
        `dayOfMonth` - the day-of-month
      Returns:
        the Minguo local date, not null
      Throws:
        `DateTimeException` - if unable to create the date

    - #### dateYearDay

          public MinguoDate dateYearDay​(Era era,
                                        int yearOfEra,
                                        int dayOfYear)

      Obtains a local date in Minguo calendar system from the era, year-of-era and day-of-year fields.
      Specified by:
        `dateYearDay` in interface `Chronology`
      Parameters:
        `era` - the Minguo era, not null
        `yearOfEra` - the year-of-era
        `dayOfYear` - the day-of-year
      Returns:
        the Minguo local date, not null
      Throws:
        `DateTimeException` - if unable to create the date
        `ClassCastException` - if the `era` is not a `MinguoEra`

    - #### dateYearDay

          public MinguoDate dateYearDay​(int prolepticYear,
                                        int dayOfYear)

      Obtains a local date in Minguo calendar system from the proleptic-year and day-of-year fields.
      Specified by:
        `dateYearDay` in interface `Chronology`
      Parameters:
        `prolepticYear` - the proleptic-year
        `dayOfYear` - the day-of-year
      Returns:
        the Minguo local date, not null
      Throws:
        `DateTimeException` - if unable to create the date

    - #### dateEpochDay

          public MinguoDate dateEpochDay​(long epochDay)

      Obtains a local date in the Minguo calendar system from the epoch-day.
      Specified by:
        `dateEpochDay` in interface `Chronology`
      Parameters:
        `epochDay` - the epoch day
      Returns:
        the Minguo local date, not null
      Throws:
        `DateTimeException` - if unable to create the date

    - #### isLeapYear

          public boolean isLeapYear​(long prolepticYear)

      Checks if the specified year is a leap year.

      Minguo leap years occur exactly in line with ISO leap years. This method does not validate the year passed in, and only has a well-defined result for years in the supported range.

      Specified by:
        `isLeapYear` in interface `Chronology`
      Parameters:
        `prolepticYear` - the proleptic-year to check, not validated for range
      Returns:
        true if the year is a leap year