Class JulianChronology

java.lang.Object
javax.time.calendar.Chronology
javax.time.i18n.JulianChronology
All Implemented Interfaces:
Serializable, Calendrical
public final class JulianChronology extends Chronology implements Serializable
The Julian calendar system.

JulianChronology defines the rules of the Julian calendar system. The Julian calendar was introduced by Julius Caesar in 46 BCE to replace the previous Roman calendar system.

The calendar system is the same as the ISOChronology ISO-8601 calendar system with the exception of the rule for the leap year. The Julian definition has a leap year every four years without fail.

JulianChronology is immutable and thread-safe.

See Also:

  • Field Details

    • INSTANCE

      public static final JulianChronology INSTANCE
      The singleton instance of JulianChronology.

    • serialVersionUID

      private static final long serialVersionUID
      The serialization version.
      See Also:

    • YEARS

      private static final PeriodUnit YEARS
      Period unit for years.

    • MONTHS

      private static final PeriodUnit MONTHS
      Period unit for months.

  • Constructor Details

    • JulianChronology

      private JulianChronology()
      Restrictive constructor.

  • Method Details

    • readResolve

      private Object readResolve()
      Resolves singleton.
      Returns:
      the singleton instance

    • checkNotNull

      static void checkNotNull(Object object, String errorMessage)
      Validates that the input value is not null.
      Parameters:
      object - the object to check
      errorMessage - the error to throw
      Throws:
      NullPointerException - if the object is null

    • isLeapYear

      public static boolean isLeapYear(int year)
      Checks if the specified year is a leap year.

      The Julian calendar system defines a leap year as being divisible by four without remainder. The calculation is proleptic - applying the same rules into the far future and far past.

      Parameters:
      year - the year to check, not validated for range
      Returns:
      true if the year is a leap year

    • getName

      public String getName()
      Gets the name of the chronology.
      Specified by:
      getName in class Chronology
      Returns:
      the name of the chronology, never null

    • periodYears

      public static PeriodUnit periodYears()
      Gets the period unit for years.

      The period unit defines the concept of a period of a year in the Julian calendar system. This has an estimated duration equal to 365.25 days.

      See

      invalid reference 
      #yearRule()
      for the main date-time field.
      Returns:
      the period unit for years, never null

    • periodMonths

      public static PeriodUnit periodMonths()
      Gets the period unit for months.

      The period unit defines the concept of a period of a month in the Julian calendar system. This has an estimated duration equal to one-twelfth of 365.25 days.

      See

      invalid reference 
      #monthOfYearRule()
      for the main date-time field.
      Returns:
      the period unit for months, never null

    • periodWeeks

      public static PeriodUnit periodWeeks()
      Gets the period unit for weeks.

      The period unit defines the concept of a period of a week. This is equivalent to the ISO weeks period unit.

      Returns:
      the period unit for weeks, never null

    • periodDays

      public static PeriodUnit periodDays()
      Gets the period unit for days.

      The period unit defines the concept of a period of a day. This is equivalent to the ISO days period unit.

      See

      invalid reference 
      #dayOfMonthRule()
      for the main date-time field.
      Returns:
      the period unit for days, never null