JulianCalendar (Time4J-Base 5.8 API)

java.lang.Object
- net.time4j.engine.ChronoEntity<T>
- - net.time4j.engine.TimePoint<U,D>
  - - net.time4j.engine.Calendrical<JulianCalendar.Unit,JulianCalendar>
    - - net.time4j.calendar.JulianCalendar

All Implemented Interfaces:

Serializable, Comparable<JulianCalendar>, CalendarDate, ChronoDisplay, Temporal<CalendarDate>, LocalizedPatternSupport
```
@CalendarType(value="julian")
public final class JulianCalendar
extends Calendrical<JulianCalendar.Unit,JulianCalendar>
implements LocalizedPatternSupport
```
Represents the proleptic Julian calendar.

Introduction

It is de facto the ancestor of modern gregorian calendar but does not reflect any historic anomalies and applies its leap year rules even backwards into the far past. The main difference to gregorian calendar is the leap year rule which considers every year as leap year whose number is divisible by four.

Following elements which are declared as constants are registered by this class
Furthermore, all elements defined in EpochDays and CommonElements are supported.

Example of usage
```
     ChronoFormatter<JulianCalendar> formatter =
       ChronoFormatter.ofPattern(
          "E, d.MMMM yyyy", PatternType.CLDR, Locale.ENGLISH, JulianCalendar.axis());
     PlainDate today = SystemClock.inLocalView().today();
     JulianCalendar julianDate = today.transform(JulianCalendar.class);
     System.out.println(formatter.format(julianDate));
 
```
Support for unicode ca-extensions
```
      Locale locale = Locale.forLanguageTag("en-u-ca-julian");
      ChronoFormatter<CalendarDate> f = ChronoFormatter.ofGenericCalendarStyle(DisplayMode.FULL, locale);
      assertThat(
          f.format(PlainDate.of(2017, 10, 1)),
          is("Sunday, September 18, 2017 AD"));
 
```
Since:

3.15/4.12

Author:

Meno Hochschild

See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class JulianCalendar.Unit
Defines some calendar units for the Julian calendar.

Nested Classes
Modifier and Type	Class and Description
`static class`	`JulianCalendar.Unit` Defines some calendar units for the Julian calendar.

Field Summary

Fields
Modifier and Type	Field and Description
`static ChronoElement<HistoricDate>`	`DATE` Represents the Julian date.
`static ChronoElement<Integer>`	`DAY_OF_MONTH` Represents the Julian day of month.
`static ChronoElement<Weekday>`	`DAY_OF_WEEK` Represents the Julian day of week.
`static ChronoElement<Integer>`	`DAY_OF_YEAR` Represents the Julian day of year.
`static ChronoElement<HistoricEra>`	`ERA` Represents the Julian era.
`static TextElement<Integer>`	`MONTH_OF_YEAR` Represents the Julian month.
`static OrdinalWeekdayElement<JulianCalendar>`	`WEEKDAY_IN_MONTH` Element with the ordinal day-of-week within given calendar month.
`static ChronoElement<Integer>`	`YEAR_OF_ERA` Represents the Julian year.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`GeneralTimestamp<JulianCalendar>`	`at(PlainTime time)` Creates a new local timestamp with this date and given wall time.
`GeneralTimestamp<JulianCalendar>`	`atTime(int hour, int minute)` Is equivalent to `at(PlainTime.of(hour, minute))`.
`static TimeAxis<JulianCalendar.Unit,JulianCalendar>`	`axis()` Returns the associated time axis.
`boolean`	`equals(Object obj)` Based on the epoch day number and the calendar system.
`int`	`getDayOfMonth()` Yields the Julian day of month.
`Weekday`	`getDayOfWeek()` Determines the day of week.
`int`	`getDayOfYear()` Yields the Julian day of year.
`static Weekmodel`	`getDefaultWeekmodel()` Obtains the standard week model of this calendar.
`HistoricEra`	`getEra()` Yields the Julian era.
`Month`	`getMonth()` Yields the Julian month.
`int`	`getYear()` Yields the Julian year within current era.
`int`	`hashCode()` Based on the epoch day number.
`boolean`	`isLeapYear()` Is the year of this date a leap year?
`static boolean`	`isValid(HistoricEra era, int yearOfEra, int month, int dayOfMonth)` Queries if given parameter values form a well defined calendar date.
`int`	`lengthOfMonth()` Yields the length of current Julian month in days.
`int`	`lengthOfYear()` Yields the length of current Julian year in days.
`static JulianCalendar`	`nowInSystemTime()` Obtains the current calendar date in system time.
`static JulianCalendar`	`of(HistoricEra era, int yearOfEra, int month, int dayOfMonth)` Creates a new instance of a Julian calendar date.
`static JulianCalendar`	`of(HistoricEra era, int yearOfEra, Month month, int dayOfMonth)` Creates a new instance of a Julian calendar date.
`String`	`toString()` Provides a complete textual representation of the state of this time point.

Methods inherited from class net.time4j.engine.Calendrical
compareTo, getDaysSinceEpochUTC, isAfter, isBefore, isSimultaneous, minus, plus

Methods inherited from class net.time4j.engine.TimePoint
max, min, minus, minus, plus, plus, until, until

Methods inherited from class net.time4j.engine.ChronoEntity
contains, get, get, getInt, getMaximum, getMinimum, getRegisteredElements, getTimezone, hasTimezone, isValid, isValid, isValid, matches, with, with, with, with

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.time4j.format.LocalizedPatternSupport
getFormatPattern, getFormatPattern, useDynamicFormatPattern

Methods inherited from interface net.time4j.engine.CalendarDate
from, from, from, transform, transform, transform, transform, transform, transform

Methods inherited from interface net.time4j.engine.Temporal
isAfterAll, isAfterOrEqual, isBeforeAll, isBeforeOrEqual

- Field Detail
  - DATE
```
public static final ChronoElement<HistoricDate> DATE
```
    Represents the Julian date.
    
    This element is identical to ChronoHistory.PROLEPTIC_JULIAN.date().
  - ERA
```
@FormattableElement(format="G")
public static final ChronoElement<HistoricEra> ERA
```
    Represents the Julian era.
    
    This element is identical to ChronoHistory.PROLEPTIC_JULIAN.era(). Valid values are either HistoricEra.AD or HistoricEra.BC. However, the era cannot be changed by the expression julianDate.with(ERA, historicEra).
  - YEAR_OF_ERA
```
@FormattableElement(format="y")
public static final ChronoElement<Integer> YEAR_OF_ERA
```
    Represents the Julian year.
    
    This element is identical to ChronoHistory.PROLEPTIC_JULIAN.yearOfEra().
  - MONTH_OF_YEAR
```
@FormattableElement(format="M",
                    alt="L")
public static final TextElement<Integer> MONTH_OF_YEAR
```
    Represents the Julian month.
    
    This element is identical to ChronoHistory.PROLEPTIC_JULIAN.month().
  - DAY_OF_MONTH
```
@FormattableElement(format="d")
public static final ChronoElement<Integer> DAY_OF_MONTH
```
    Represents the Julian day of month.
    
    This element is identical to ChronoHistory.PROLEPTIC_JULIAN.dayOfMonth().
  - DAY_OF_YEAR
```
@FormattableElement(format="D")
public static final ChronoElement<Integer> DAY_OF_YEAR
```
    Represents the Julian day of year.
  - DAY_OF_WEEK
```
@FormattableElement(format="E")
public static final ChronoElement<Weekday> DAY_OF_WEEK
```
    Represents the Julian day of week.
    
    If the day-of-week is set to a new value then Time4J handles the Julian calendar week as starting on Sunday which is close to historic use.
    
    See Also:
    
    getDefaultWeekmodel(), CommonElements.localDayOfWeek(Chronology, Weekmodel)
  - WEEKDAY_IN_MONTH
```
@FormattableElement(format="F")
public static final OrdinalWeekdayElement<JulianCalendar> WEEKDAY_IN_MONTH
```
    Element with the ordinal day-of-week within given calendar month.
- Method Detail
  - of
```
public static JulianCalendar of(HistoricEra era,
                                int yearOfEra,
                                int month,
                                int dayOfMonth)
```
    Creates a new instance of a Julian calendar date.
    
    Parameters:
    
    era - either HistoricEra.AD or HistoricEra.BC
    
    yearOfEra - year of era in range 1 until 999,999,999
    
    month - month (1-12)
    
    dayOfMonth - day of month (1-31)
    
    Returns:
    
    new instance of JulianCalendar
    
    Throws:
    
    IllegalArgumentException - in case of any inconsistencies
    
    Since:
    
    3.15/4.12
  - of
```
public static JulianCalendar of(HistoricEra era,
                                int yearOfEra,
                                Month month,
                                int dayOfMonth)
```
    Creates a new instance of a Julian calendar date.
    
    Parameters:
    
    era - either HistoricEra.AD or HistoricEra.BC
    
    yearOfEra - year of era in range 1 until 999,999,999
    
    month - month (1-12)
    
    dayOfMonth - day of month (1-31)
    
    Returns:
    
    new instance of JulianCalendar
    
    Throws:
    
    IllegalArgumentException - in case of any inconsistencies
    
    Since:
    
    3.15/4.12
  - nowInSystemTime
```
public static JulianCalendar nowInSystemTime()
```
    Obtains the current calendar date in system time.
    
    Convenient short-cut for: SystemClock.inLocalView().now(JulianCalendar.axis()).
    
    Returns:
    
    current calendar date in system time zone using the system clock
    
    Since:
    
    3.23/4.19
    
    See Also:
    
    SystemClock.inLocalView(), ZonalClock.now(net.time4j.engine.Chronology)
  - getEra
```
public HistoricEra getEra()
```
    Yields the Julian era.
    
    Returns:
    
    either HistoricEra.AD or HistoricEra.BC
    
    Since:
    
    3.15/4.12
  - getYear
```
public int getYear()
```
    Yields the Julian year within current era.
    
    Returns:
    
    int (1 <= year <= 999,999,999)
    
    Since:
    
    3.15/4.12
  - getMonth
```
public Month getMonth()
```
    Yields the Julian month.
    
    Returns:
    
    enum
    
    Since:
    
    3.15/4.12
  - getDayOfMonth
```
public int getDayOfMonth()
```
    Yields the Julian day of month.
    
    Returns:
    
    int
    
    Since:
    
    3.15/4.12
  - getDayOfWeek
```
public Weekday getDayOfWeek()
```
    Determines the day of week.
    
    Returns:
    
    Weekday
    
    Since:
    
    3.15/4.12
  - getDayOfYear
```
public int getDayOfYear()
```
    Yields the Julian day of year.
    
    Returns:
    
    int
    
    Since:
    
    3.15/4.12
  - lengthOfMonth
```
public int lengthOfMonth()
```
    Yields the length of current Julian month in days.
    
    Returns:
    
    int
    
    Since:
    
    3.15/4.12
  - lengthOfYear
```
public int lengthOfYear()
```
    Yields the length of current Julian year in days.
    
    Returns:
    
    int
    
    Since:
    
    3.15/4.12
  - isLeapYear
```
public boolean isLeapYear()
```
    Is the year of this date a leap year?
    
    Returns:
    
    boolean
    
    Since:
    
    3.15/4.12
  - isValid
```
public static boolean isValid(HistoricEra era,
                              int yearOfEra,
                              int month,
                              int dayOfMonth)
```
    Queries if given parameter values form a well defined calendar date.
    
    Parameters:
    
    era - the era to be checked
    
    yearOfEra - the year of era to be checked
    
    month - the month to be checked
    
    dayOfMonth - the day of month to be checked
    
    Returns:
    
    true if valid else false
    
    Since:
    
    3.34/4.29
    
    See Also:
    
    of(HistoricEra, int, int, int)
  - at
```
public GeneralTimestamp<JulianCalendar> at(PlainTime time)
```
    Creates a new local timestamp with this date and given wall time.
    
    If the time T24:00 is used then the resulting timestamp will automatically be normalized such that the timestamp will contain the following day instead.
    
    Parameters:
    
    time - wall time
    
    Returns:
    
    general timestamp as composition of this date and given time
    
    Since:
    
    3.15/4.12
  - atTime
```
public GeneralTimestamp<JulianCalendar> atTime(int hour,
                                               int minute)
```
    Is equivalent to at(PlainTime.of(hour, minute)).
    
    Parameters:
    
    hour - hour of day in range (0-24)
    
    minute - minute of hour in range (0-59)
    
    Returns:
    
    general timestamp as composition of this date and given time
    
    Throws:
    
    IllegalArgumentException - if any argument is out of range
    
    Since:
    
    3.15/4.12
  - equals
```
public boolean equals(Object obj)
```
    Description copied from class: Calendrical
    
    Based on the epoch day number and the calendar system.
    
    In other words: Two date object are equal if they have the same temporal position on the local timeline and have the same calendrical type. Subclasses which define further state attributes must override this method.
    
    If an only temporal comparison is required then the method Calendrical.isSimultaneous(CalendarDate) is to be used.
    
    Overrides:
    
    equals in class Calendrical<JulianCalendar.Unit,JulianCalendar>
    
    See Also:
    
    Chronology.getChronoType()
  - hashCode
```
public int hashCode()
```
    Description copied from class: Calendrical
    
    Based on the epoch day number.
    
    Overrides:
    
    hashCode in class Calendrical<JulianCalendar.Unit,JulianCalendar>
  - toString
```
public String toString()
```
    Description copied from class: TimePoint
    
    Provides a complete textual representation of the state of this time point.
    
    The textual description often follows the conventions of ISO-8601. Usually the description starts with the chronological informations which are coarse-grained and ends with those ones which are fine-grained (for example the ISO-notation YYYY-MM-DD).
    
    Specified by:
    
    toString in class TimePoint<JulianCalendar.Unit,JulianCalendar>
  - getDefaultWeekmodel
```
public static Weekmodel getDefaultWeekmodel()
```
    Obtains the standard week model of this calendar.
    
    The Julian calendar usually starts on Sunday.
    
    Returns:
    
    Weekmodel
    
    Since:
    
    3.24/4.20
  - axis
```
public static TimeAxis<JulianCalendar.Unit,JulianCalendar> axis()
```
    Returns the associated time axis.
    
    Returns:
    
    chronology
    
    Since:
    
    3.15/4.12

Class JulianCalendar

Introduction

Following elements which are declared as constants are registered by this class

Example of usage

Support for unicode ca-extensions

Nested Class Summary

Field Summary

Method Summary

Methods inherited from class net.time4j.engine.Calendrical

Methods inherited from class net.time4j.engine.TimePoint

Methods inherited from class net.time4j.engine.ChronoEntity

Methods inherited from class java.lang.Object

Methods inherited from interface net.time4j.format.LocalizedPatternSupport

Methods inherited from interface net.time4j.engine.CalendarDate

Methods inherited from interface net.time4j.engine.Temporal

Field Detail

DATE

ERA

YEAR_OF_ERA

MONTH_OF_YEAR

DAY_OF_MONTH

DAY_OF_YEAR

DAY_OF_WEEK

WEEKDAY_IN_MONTH

Method Detail

of

of

nowInSystemTime

getEra

getYear

getMonth

getDayOfMonth

getDayOfWeek

getDayOfYear

lengthOfMonth

lengthOfYear

isLeapYear

isValid

at

atTime

equals

hashCode

toString

getDefaultWeekmodel

axis