- java.lang.Object
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- org.threeten.extra.chrono.JulianDate
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- All Implemented Interfaces:
Serializable
,Comparable<ChronoLocalDate>
,ChronoLocalDate
,Temporal
,TemporalAccessor
,TemporalAdjuster
public final class JulianDate extends Object implements ChronoLocalDate, Serializable
A date in the Julian calendar system.This date operates using the Julian calendar. This calendar system is the forerunner to the modern Gregorian and ISO calendars. The Julian differs from the Gregorian only in terms of the leap year rule. Dates are aligned such that
0001-01-01 (Julian)
is0000-12-30 (ISO)
.Implementation Requirements
This class is immutable and thread-safe.This class must be treated as a value type. Do not synchronize, rely on the identity hash code or use the distinction between equals() and ==.
- See Also:
- Serialized Form
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description ChronoLocalDateTime<JulianDate>
atTime(LocalTime localTime)
boolean
equals(Object obj)
Compares this date to another date, including the chronology.static JulianDate
from(TemporalAccessor temporal)
Obtains aJulianDate
from a temporal object.JulianChronology
getChronology()
Gets the chronology of this date, which is the Julian calendar system.JulianEra
getEra()
Gets the era applicable at this date.long
getLong(TemporalField field)
int
hashCode()
A hash code for this date.int
lengthOfMonth()
Returns the length of the month represented by this date.JulianDate
minus(long amountToSubtract, TemporalUnit unit)
JulianDate
minus(TemporalAmount amount)
static JulianDate
now()
Obtains the currentJulianDate
from the system clock in the default time-zone.static JulianDate
now(Clock clock)
Obtains the currentJulianDate
from the specified clock.static JulianDate
now(ZoneId zone)
Obtains the currentJulianDate
from the system clock in the specified time-zone.static JulianDate
of(int prolepticYear, int month, int dayOfMonth)
Obtains aJulianDate
representing a date in the Julian calendar system from the proleptic-year, month-of-year and day-of-month fields.JulianDate
plus(long amountToAdd, TemporalUnit unit)
JulianDate
plus(TemporalAmount amount)
ValueRange
range(TemporalField field)
long
toEpochDay()
String
toString()
ChronoPeriod
until(ChronoLocalDate endDateExclusive)
long
until(Temporal endExclusive, TemporalUnit unit)
JulianDate
with(TemporalAdjuster adjuster)
JulianDate
with(TemporalField field, long newValue)
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Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface java.time.chrono.ChronoLocalDate
adjustInto, compareTo, equals, format, hashCode, isAfter, isBefore, isEqual, isLeapYear, isSupported, isSupported, lengthOfYear, query, toString
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Methods inherited from interface java.time.temporal.TemporalAccessor
get, getLong, range
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Method Detail
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now
public static JulianDate now()
Obtains the currentJulianDate
from the system clock in the default time-zone.This will query the
system clock
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:
- the current date using the system clock and default time-zone, not null
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now
public static JulianDate now(ZoneId zone)
Obtains the currentJulianDate
from the system clock in the specified time-zone.This will query the
system clock
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
- the zone ID to use, not null- Returns:
- the current date using the system clock, not null
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now
public static JulianDate now(Clock clock)
Obtains the currentJulianDate
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.
- Parameters:
clock
- the clock to use, not null- Returns:
- the current date, not null
- Throws:
DateTimeException
- if the current date cannot be obtained
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of
public static JulianDate of(int prolepticYear, int month, int dayOfMonth)
Obtains aJulianDate
representing a date in the Julian calendar system from the proleptic-year, month-of-year and day-of-month fields.This returns a
JulianDate
with the specified fields. The day must be valid for the year and month, otherwise an exception will be thrown.- Parameters:
prolepticYear
- the Julian proleptic-yearmonth
- the Julian month-of-year, from 1 to 12dayOfMonth
- the Julian day-of-month, from 1 to 31- Returns:
- the date in Julian calendar system, not null
- Throws:
DateTimeException
- if the value of any field is out of range, or if the day-of-month is invalid for the month-year
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from
public static JulianDate from(TemporalAccessor temporal)
Obtains aJulianDate
from a temporal object.This obtains a date in the Julian 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 ofJulianDate
.The conversion typically uses the
EPOCH_DAY
field, which is standardized across calendar systems.This method matches the signature of the functional interface
TemporalQuery
allowing it to be used as a query via method reference,JulianDate::from
.- Parameters:
temporal
- the temporal object to convert, not null- Returns:
- the date in Julian calendar system, not null
- Throws:
DateTimeException
- if unable to convert to aJulianDate
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getChronology
public JulianChronology getChronology()
Gets the chronology of this date, which is the Julian calendar system.The
Chronology
represents the calendar system in use. The era and other fields inChronoField
are defined by the chronology.- Specified by:
getChronology
in interfaceChronoLocalDate
- Returns:
- the Julian chronology, not null
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getEra
public JulianEra getEra()
Gets the era applicable at this date.The Julian calendar system has two eras, 'AD' and 'BC', defined by
JulianEra
.- Specified by:
getEra
in interfaceChronoLocalDate
- Returns:
- the era applicable at this date, not null
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lengthOfMonth
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.
- Specified by:
lengthOfMonth
in interfaceChronoLocalDate
- Returns:
- the length of the month in days, from 28 to 31
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with
public JulianDate with(TemporalAdjuster adjuster)
- Specified by:
with
in interfaceChronoLocalDate
- Specified by:
with
in interfaceTemporal
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with
public JulianDate with(TemporalField field, long newValue)
- Specified by:
with
in interfaceChronoLocalDate
- Specified by:
with
in interfaceTemporal
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plus
public JulianDate plus(TemporalAmount amount)
- Specified by:
plus
in interfaceChronoLocalDate
- Specified by:
plus
in interfaceTemporal
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plus
public JulianDate plus(long amountToAdd, TemporalUnit unit)
- Specified by:
plus
in interfaceChronoLocalDate
- Specified by:
plus
in interfaceTemporal
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minus
public JulianDate minus(TemporalAmount amount)
- Specified by:
minus
in interfaceChronoLocalDate
- Specified by:
minus
in interfaceTemporal
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minus
public JulianDate minus(long amountToSubtract, TemporalUnit unit)
- Specified by:
minus
in interfaceChronoLocalDate
- Specified by:
minus
in interfaceTemporal
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atTime
public ChronoLocalDateTime<JulianDate> atTime(LocalTime localTime)
- Specified by:
atTime
in interfaceChronoLocalDate
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until
public long until(Temporal endExclusive, TemporalUnit unit)
- Specified by:
until
in interfaceChronoLocalDate
- Specified by:
until
in interfaceTemporal
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until
public ChronoPeriod until(ChronoLocalDate endDateExclusive)
- Specified by:
until
in interfaceChronoLocalDate
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toEpochDay
public long toEpochDay()
- Specified by:
toEpochDay
in interfaceChronoLocalDate
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range
public ValueRange range(TemporalField field)
- Specified by:
range
in interfaceTemporalAccessor
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getLong
public long getLong(TemporalField field)
- Specified by:
getLong
in interfaceTemporalAccessor
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equals
public boolean equals(Object obj)
Compares this date to another date, including the chronology.Compares this date with another ensuring that the date is the same.
Only objects of this concrete type are compared, other types return false. To compare the dates of two
TemporalAccessor
instances, including dates in two different chronologies, useChronoField.EPOCH_DAY
as a comparator.- Specified by:
equals
in interfaceChronoLocalDate
- Overrides:
equals
in classObject
- Parameters:
obj
- the object to check, null returns false- Returns:
- true if this is equal to the other date
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hashCode
public int hashCode()
A hash code for this date.- Specified by:
hashCode
in interfaceChronoLocalDate
- Overrides:
hashCode
in classObject
- Returns:
- a suitable hash code based only on the Chronology and the date
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toString
public String toString()
- Specified by:
toString
in interfaceChronoLocalDate
- Overrides:
toString
in classObject
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