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 // © 2016 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
 /*
 * Copyright (C) 1997-2013, International Business Machines Corporation and others.
 * All Rights Reserved.
 ********************************************************************************
 *
 * File GREGOCAL.H
 *
 * Modification History:
 *
 *   Date        Name        Description
 *   04/22/97    aliu        Overhauled header.
 *    07/28/98    stephen        Sync with JDK 1.2
 *    09/04/98    stephen        Re-sync with JDK 8/31 putback
 *    09/14/98    stephen        Changed type of kOneDay, kOneWeek to double.
 *                            Fixed bug in roll()
 *   10/15/99    aliu        Fixed j31, incorrect WEEK_OF_YEAR computation.
 *                           Added documentation of WEEK_OF_YEAR computation.
 *   10/15/99    aliu        Fixed j32, cannot set date to Feb 29 2000 AD.
 *                           {JDK bug 4210209 4209272}
 *   11/07/2003  srl         Update, clean up documentation.
 ********************************************************************************
 */
 
 #ifndef GREGOCAL_H
 #define GREGOCAL_H
 
 #include "unicode/utypes.h"
 
 #if U_SHOW_CPLUSPLUS_API
 
 #if !UCONFIG_NO_FORMATTING
 
 #include "unicode/calendar.h"
 
 /**
  * \file 
  * \brief C++ API: Concrete class which provides the standard calendar.
  */
 
 U_NAMESPACE_BEGIN
 
 /** 
  * Concrete class which provides the standard calendar used by most of the world.
  * <P>
  * The standard (Gregorian) calendar has 2 eras, BC and AD.
  * <P>
  * This implementation handles a single discontinuity, which corresponds by default to
  * the date the Gregorian calendar was originally instituted (October 15, 1582). Not all
  * countries adopted the Gregorian calendar then, so this cutover date may be changed by
  * the caller.
  * <P>
  * Prior to the institution of the Gregorian Calendar, New Year's Day was March 25. To
  * avoid confusion, this Calendar always uses January 1. A manual adjustment may be made
  * if desired for dates that are prior to the Gregorian changeover and which fall
  * between January 1 and March 24.
  *
  * <p>Values calculated for the <code>WEEK_OF_YEAR</code> field range from 1 to
  * 53.  Week 1 for a year is the first week that contains at least
  * <code>getMinimalDaysInFirstWeek()</code> days from that year.  It thus
  * depends on the values of <code>getMinimalDaysInFirstWeek()</code>,
  * <code>getFirstDayOfWeek()</code>, and the day of the week of January 1.
  * Weeks between week 1 of one year and week 1 of the following year are
  * numbered sequentially from 2 to 52 or 53 (as needed).
  *
  * <p>For example, January 1, 1998 was a Thursday.  If
  * <code>getFirstDayOfWeek()</code> is <code>MONDAY</code> and
  * <code>getMinimalDaysInFirstWeek()</code> is 4 (these are the values
  * reflecting ISO 8601 and many national standards), then week 1 of 1998 starts
  * on December 29, 1997, and ends on January 4, 1998.  If, however,
  * <code>getFirstDayOfWeek()</code> is <code>SUNDAY</code>, then week 1 of 1998
  * starts on January 4, 1998, and ends on January 10, 1998; the first three days
  * of 1998 then are part of week 53 of 1997.
  *
  * <p>Example for using GregorianCalendar:
  * <pre>
  * \code
  *     // get the supported ids for GMT-08:00 (Pacific Standard Time)
  *     UErrorCode success = U_ZERO_ERROR;
  *     const StringEnumeration *ids = TimeZone::createEnumeration(-8 * 60 * 60 * 1000, success);
  *     // if no ids were returned, something is wrong. get out.
  *     if (U_FAILURE(success)) {
  *         return;
  *     }
  *
  *     // begin output
  *     cout << "Current Time" << endl;
  *
  *     // create a Pacific Standard Time time zone
  *     SimpleTimeZone* pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, ids->unext(nullptr, success)));
  *
  *     // set up rules for daylight savings time
  *     pdt->setStartRule(UCAL_MARCH, 1, UCAL_SUNDAY, 2 * 60 * 60 * 1000);
  *     pdt->setEndRule(UCAL_NOVEMBER, 2, UCAL_SUNDAY, 2 * 60 * 60 * 1000);
  *
  *     // create a GregorianCalendar with the Pacific Daylight time zone
  *     // and the current date and time
  *     Calendar* calendar = new GregorianCalendar( pdt, success );
  *
  *     // print out a bunch of interesting things
  *     cout << "ERA: " << calendar->get( UCAL_ERA, success ) << endl;
  *     cout << "YEAR: " << calendar->get( UCAL_YEAR, success ) << endl;
  *     cout << "MONTH: " << calendar->get( UCAL_MONTH, success ) << endl;
  *     cout << "WEEK_OF_YEAR: " << calendar->get( UCAL_WEEK_OF_YEAR, success ) << endl;
  *     cout << "WEEK_OF_MONTH: " << calendar->get( UCAL_WEEK_OF_MONTH, success ) << endl;
  *     cout << "DATE: " << calendar->get( UCAL_DATE, success ) << endl;
  *     cout << "DAY_OF_MONTH: " << calendar->get( UCAL_DAY_OF_MONTH, success ) << endl;
  *     cout << "DAY_OF_YEAR: " << calendar->get( UCAL_DAY_OF_YEAR, success ) << endl;
  *     cout << "DAY_OF_WEEK: " << calendar->get( UCAL_DAY_OF_WEEK, success ) << endl;
  *     cout << "DAY_OF_WEEK_IN_MONTH: " << calendar->get( UCAL_DAY_OF_WEEK_IN_MONTH, success ) << endl;
  *     cout << "AM_PM: " << calendar->get( UCAL_AM_PM, success ) << endl;
  *     cout << "HOUR: " << calendar->get( UCAL_HOUR, success ) << endl;
  *     cout << "HOUR_OF_DAY: " << calendar->get( UCAL_HOUR_OF_DAY, success ) << endl;
  *     cout << "MINUTE: " << calendar->get( UCAL_MINUTE, success ) << endl;
  *     cout << "SECOND: " << calendar->get( UCAL_SECOND, success ) << endl;
  *     cout << "MILLISECOND: " << calendar->get( UCAL_MILLISECOND, success ) << endl;
  *     cout << "ZONE_OFFSET: " << (calendar->get( UCAL_ZONE_OFFSET, success )/(60*60*1000)) << endl;
  *     cout << "DST_OFFSET: " << (calendar->get( UCAL_DST_OFFSET, success )/(60*60*1000)) << endl;
  *
  *     cout << "Current Time, with hour reset to 3" << endl;
  *     calendar->clear(UCAL_HOUR_OF_DAY); // so doesn't override
  *     calendar->set(UCAL_HOUR, 3);
  *     cout << "ERA: " << calendar->get( UCAL_ERA, success ) << endl;
  *     cout << "YEAR: " << calendar->get( UCAL_YEAR, success ) << endl;
  *     cout << "MONTH: " << calendar->get( UCAL_MONTH, success ) << endl;
  *     cout << "WEEK_OF_YEAR: " << calendar->get( UCAL_WEEK_OF_YEAR, success ) << endl;
  *     cout << "WEEK_OF_MONTH: " << calendar->get( UCAL_WEEK_OF_MONTH, success ) << endl;
  *     cout << "DATE: " << calendar->get( UCAL_DATE, success ) << endl;
  *     cout << "DAY_OF_MONTH: " << calendar->get( UCAL_DAY_OF_MONTH, success ) << endl;
  *     cout << "DAY_OF_YEAR: " << calendar->get( UCAL_DAY_OF_YEAR, success ) << endl;
  *     cout << "DAY_OF_WEEK: " << calendar->get( UCAL_DAY_OF_WEEK, success ) << endl;
  *     cout << "DAY_OF_WEEK_IN_MONTH: " << calendar->get( UCAL_DAY_OF_WEEK_IN_MONTH, success ) << endl;
  *     cout << "AM_PM: " << calendar->get( UCAL_AM_PM, success ) << endl;
  *     cout << "HOUR: " << calendar->get( UCAL_HOUR, success ) << endl;
  *     cout << "HOUR_OF_DAY: " << calendar->get( UCAL_HOUR_OF_DAY, success ) << endl;
  *     cout << "MINUTE: " << calendar->get( UCAL_MINUTE, success ) << endl;
  *     cout << "SECOND: " << calendar->get( UCAL_SECOND, success ) << endl;
  *     cout << "MILLISECOND: " << calendar->get( UCAL_MILLISECOND, success ) << endl;
  *     cout << "ZONE_OFFSET: " << (calendar->get( UCAL_ZONE_OFFSET, success )/(60*60*1000)) << endl; // in hours
  *     cout << "DST_OFFSET: " << (calendar->get( UCAL_DST_OFFSET, success )/(60*60*1000)) << endl; // in hours
  *
  *     if (U_FAILURE(success)) {
  *         cout << "An error occurred. success=" << u_errorName(success) << endl;
  *     }
  *
  *     delete ids;
  *     delete calendar; // also deletes pdt
  * \endcode
  * </pre>
  * @stable ICU 2.0
  */
 class U_I18N_API GregorianCalendar: public Calendar {
 public:
 
     /**
      * Useful constants for GregorianCalendar and TimeZone.
      * @stable ICU 2.0
      */
     enum EEras {
         BC,
         AD
     };
 
     /**
      * Constructs a default GregorianCalendar using the current time in the default time
      * zone with the default locale.
      *
      * @param success  Indicates the status of GregorianCalendar object construction.
      *                 Returns U_ZERO_ERROR if constructed successfully.
      * @stable ICU 2.0
      */
     GregorianCalendar(UErrorCode& success);
 
     /**
      * Constructs a GregorianCalendar based on the current time in the given time zone
      * with the default locale. Clients are no longer responsible for deleting the given
      * time zone object after it's adopted.
      *
      * @param zoneToAdopt     The given timezone.
      * @param success  Indicates the status of GregorianCalendar object construction.
      *                 Returns U_ZERO_ERROR if constructed successfully.
      * @stable ICU 2.0
      */
     GregorianCalendar(TimeZone* zoneToAdopt, UErrorCode& success);
 
     /**
      * Constructs a GregorianCalendar based on the current time in the given time zone
      * with the default locale.
      *
      * @param zone     The given timezone.
      * @param success  Indicates the status of GregorianCalendar object construction.
      *                 Returns U_ZERO_ERROR if constructed successfully.
      * @stable ICU 2.0
      */
     GregorianCalendar(const TimeZone& zone, UErrorCode& success);
 
     /**
      * Constructs a GregorianCalendar based on the current time in the default time zone
      * with the given locale.
      *
      * @param aLocale  The given locale.
      * @param success  Indicates the status of GregorianCalendar object construction.
      *                 Returns U_ZERO_ERROR if constructed successfully.
      * @stable ICU 2.0
      */
     GregorianCalendar(const Locale& aLocale, UErrorCode& success);
 
     /**
      * Constructs a GregorianCalendar based on the current time in the given time zone
      * with the given locale. Clients are no longer responsible for deleting the given
      * time zone object after it's adopted.
      *
      * @param zoneToAdopt     The given timezone.
      * @param aLocale  The given locale.
      * @param success  Indicates the status of GregorianCalendar object construction.
      *                 Returns U_ZERO_ERROR if constructed successfully.
      * @stable ICU 2.0
      */
     GregorianCalendar(TimeZone* zoneToAdopt, const Locale& aLocale, UErrorCode& success);
 
     /**
      * Constructs a GregorianCalendar based on the current time in the given time zone
      * with the given locale.
      *
      * @param zone     The given timezone.
      * @param aLocale  The given locale.
      * @param success  Indicates the status of GregorianCalendar object construction.
      *                 Returns U_ZERO_ERROR if constructed successfully.
      * @stable ICU 2.0
      */
     GregorianCalendar(const TimeZone& zone, const Locale& aLocale, UErrorCode& success);
 
     /**
      * Constructs a GregorianCalendar with the given AD date set in the default time
      * zone with the default locale.
      *
      * @param year     The value used to set the YEAR time field in the calendar.
      * @param month    The value used to set the MONTH time field in the calendar. Month
      *                 value is 0-based. e.g., 0 for January.
      * @param date     The value used to set the DATE time field in the calendar.
      * @param success  Indicates the status of GregorianCalendar object construction.
      *                 Returns U_ZERO_ERROR if constructed successfully.
      * @stable ICU 2.0
      */
     GregorianCalendar(int32_t year, int32_t month, int32_t date, UErrorCode& success);
 
     /**
      * Constructs a GregorianCalendar with the given AD date and time set for the
      * default time zone with the default locale.
      *
      * @param year     The value used to set the YEAR time field in the calendar.
      * @param month    The value used to set the MONTH time field in the calendar. Month
      *                 value is 0-based. e.g., 0 for January.
      * @param date     The value used to set the DATE time field in the calendar.
      * @param hour     The value used to set the HOUR_OF_DAY time field in the calendar.
      * @param minute   The value used to set the MINUTE time field in the calendar.
      * @param success  Indicates the status of GregorianCalendar object construction.
      *                 Returns U_ZERO_ERROR if constructed successfully.
      * @stable ICU 2.0
      */
     GregorianCalendar(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, UErrorCode& success);
 
     /**
      * Constructs a GregorianCalendar with the given AD date and time set for the
      * default time zone with the default locale.
      *
      * @param year     The value used to set the YEAR time field in the calendar.
      * @param month    The value used to set the MONTH time field in the calendar. Month
      *                 value is 0-based. e.g., 0 for January.
      * @param date     The value used to set the DATE time field in the calendar.
      * @param hour     The value used to set the HOUR_OF_DAY time field in the calendar.
      * @param minute   The value used to set the MINUTE time field in the calendar.
      * @param second   The value used to set the SECOND time field in the calendar.
      * @param success  Indicates the status of GregorianCalendar object construction.
      *                 Returns U_ZERO_ERROR if constructed successfully.
      * @stable ICU 2.0
      */
     GregorianCalendar(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, int32_t second, UErrorCode& success);
 
     /**
      * Destructor
      * @stable ICU 2.0
      */
     virtual ~GregorianCalendar();
 
     /**
      * Copy constructor
      * @param source    the object to be copied.
      * @stable ICU 2.0
      */
     GregorianCalendar(const GregorianCalendar& source);
 
     /**
      * Default assignment operator
      * @param right    the object to be copied.
      * @stable ICU 2.0
      */
     GregorianCalendar& operator=(const GregorianCalendar& right);
 
     /**
      * Create and return a polymorphic copy of this calendar.
      * @return    return a polymorphic copy of this calendar.
      * @stable ICU 2.0
      */
     virtual GregorianCalendar* clone() const override;
 
     /**
      * Sets the GregorianCalendar change date. This is the point when the switch from
      * Julian dates to Gregorian dates occurred. Default is 00:00:00 local time, October
      * 15, 1582. Previous to this time and date will be Julian dates.
      *
      * @param date     The given Gregorian cutover date.
      * @param success  Output param set to success/failure code on exit.
      * @stable ICU 2.0
      */
     void setGregorianChange(UDate date, UErrorCode& success);
 
     /**
      * Gets the Gregorian Calendar change date. This is the point when the switch from
      * Julian dates to Gregorian dates occurred. Default is 00:00:00 local time, October
      * 15, 1582. Previous to this time and date will be Julian dates.
      *
      * @return   The Gregorian cutover time for this calendar.
      * @stable ICU 2.0
      */
     UDate getGregorianChange() const;
 
     /**
      * Return true if the given year is a leap year. Determination of whether a year is
      * a leap year is actually very complicated. We do something crude and mostly
      * correct here, but for a real determination you need a lot of contextual
      * information. For example, in Sweden, the change from Julian to Gregorian happened
      * in a complex way resulting in missed leap years and double leap years between
      * 1700 and 1753. Another example is that after the start of the Julian calendar in
      * 45 B.C., the leap years did not regularize until 8 A.D. This method ignores these
      * quirks, and pays attention only to the Julian onset date and the Gregorian
      * cutover (which can be changed).
      *
      * @param year  The given year.
      * @return      True if the given year is a leap year; false otherwise.
      * @stable ICU 2.0
      */
     UBool isLeapYear(int32_t year) const;
 
     /**
      * Returns true if the given Calendar object is equivalent to this
      * one.  Calendar override.
      *
      * @param other the Calendar to be compared with this Calendar   
      * @stable ICU 2.4
      */
     virtual UBool isEquivalentTo(const Calendar& other) const override;
 
 #ifndef U_FORCE_HIDE_DEPRECATED_API
     /**
      * (Overrides Calendar) Rolls up or down by the given amount in the specified field.
      * For more information, see the documentation for Calendar::roll().
      *
      * @param field   The time field.
      * @param amount  Indicates amount to roll.
      * @param status  Output param set to success/failure code on exit. If any value
      *                previously set in the time field is invalid, this will be set to
      *                an error status.
      * @deprecated ICU 2.6. Use roll(UCalendarDateFields field, int32_t amount, UErrorCode& status) instead.
      */
     virtual void roll(EDateFields field, int32_t amount, UErrorCode& status) override;
 #endif  // U_FORCE_HIDE_DEPRECATED_API
 
     /**
      * (Overrides Calendar) Rolls up or down by the given amount in the specified field.
      * For more information, see the documentation for Calendar::roll().
      *
      * @param field   The time field.
      * @param amount  Indicates amount to roll.
      * @param status  Output param set to success/failure code on exit. If any value
      *                previously set in the time field is invalid, this will be set to
      *                an error status.
      * @stable ICU 2.6.
      */
     virtual void roll(UCalendarDateFields field, int32_t amount, UErrorCode& status) override;
 
 #ifndef U_HIDE_DEPRECATED_API
     /**
      * Return the minimum value that this field could have, given the current date.
      * For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum().
      * @param field    the time field.
      * @return         the minimum value that this field could have, given the current date.
      * @deprecated ICU 2.6. Use getActualMinimum(UCalendarDateFields field) instead.
      */
     int32_t getActualMinimum(EDateFields field) const;
 
     /**
      * Return the minimum value that this field could have, given the current date.
      * For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum().
      * @param field    the time field.
      * @param status
      * @return         the minimum value that this field could have, given the current date.
      * @deprecated ICU 2.6. Use getActualMinimum(UCalendarDateFields field) instead. (Added to ICU 3.0 for signature consistency)
      */
     int32_t getActualMinimum(EDateFields field, UErrorCode& status) const;
 #endif  /* U_HIDE_DEPRECATED_API */
 
     /**
      * Return the minimum value that this field could have, given the current date.
      * For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum().
      * @param field    the time field.
      * @param status   error result.
      * @return         the minimum value that this field could have, given the current date.
      * @stable ICU 3.0
      */
     int32_t getActualMinimum(UCalendarDateFields field, UErrorCode &status) const override;
 
     /**
      * Return the maximum value that this field could have, given the current date.
      * For example, with the date "Feb 3, 1997" and the DAY_OF_MONTH field, the actual
      * maximum would be 28; for "Feb 3, 1996" it s 29.  Similarly for a Hebrew calendar,
      * for some years the actual maximum for MONTH is 12, and for others 13.
      * @param field    the time field.
      * @param status   returns any errors that may result from this function call.
      * @return         the maximum value that this field could have, given the current date.
      * @stable ICU 2.6
      */
     virtual int32_t getActualMaximum(UCalendarDateFields field, UErrorCode& status) const override;
 
 public:
 
     /**
      * Override Calendar Returns a unique class ID POLYMORPHICALLY. Pure virtual
      * override. This method is to implement a simple version of RTTI, since not all C++
      * compilers support genuine RTTI. Polymorphic operator==() and clone() methods call
      * this method.
      *
      * @return   The class ID for this object. All objects of a given class have the
      *           same class ID. Objects of other classes have different class IDs.
      * @stable ICU 2.0
      */
     virtual UClassID getDynamicClassID() const override;
 
     /**
      * Return the class ID for this class. This is useful only for comparing to a return
      * value from getDynamicClassID(). For example:
      *
      *      Base* polymorphic_pointer = createPolymorphicObject();
      *      if (polymorphic_pointer->getDynamicClassID() ==
      *          Derived::getStaticClassID()) ...
      *
      * @return   The class ID for all objects of this class.
      * @stable ICU 2.0
      */
     static UClassID U_EXPORT2 getStaticClassID();
 
     /**
      * Returns the calendar type name string for this Calendar object.
      * The returned string is the legacy ICU calendar attribute value,
      * for example, "gregorian" or "japanese".
      *
      * For more details see the Calendar::getType() documentation.
      *
      * @return legacy calendar type name string
      * @stable ICU 49
      */
     virtual const char * getType() const override;
 
  private:
     GregorianCalendar() = delete; // default constructor not implemented
 
  protected:
     /**
      * Return the ERA.  We need a special method for this because the
      * default ERA is AD, but a zero (unset) ERA is BC.
      * @return    the ERA.
      * @internal
      */
     virtual int32_t internalGetEra() const;
 
     /**
      * Return the Julian day number of day before the first day of the
      * given month in the given extended year.  Subclasses should override
      * this method to implement their calendar system.
      * @param eyear the extended year
      * @param month the zero-based month, or 0 if useMonth is false
      * @param useMonth if false, compute the day before the first day of
      * the given year, otherwise, compute the day before the first day of
      * the given month
      * @param status Fill-in parameter which receives the status of this operation.
      * @return the Julian day number of the day before the first
      * day of the given month and year
      * @internal
      */
     virtual int64_t handleComputeMonthStart(int32_t eyear, int32_t month,
                                             UBool useMonth, UErrorCode& status) const override;
 
     /**
      * Subclasses may override this.  This method calls
      * handleGetMonthLength() to obtain the calendar-specific month
      * length.
      * @param bestField which field to use to calculate the date 
      * @param status Fill-in parameter which receives the status of this operation.
      * @return julian day specified by calendar fields.
      * @internal
      */
     virtual int32_t handleComputeJulianDay(UCalendarDateFields bestField, UErrorCode& status) override;
 
     /**
      * Return the number of days in the given month of the given extended
      * year of this calendar system.  Subclasses should override this
      * method if they can provide a more correct or more efficient
      * implementation than the default implementation in Calendar.
      * @internal
      */
     virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month, UErrorCode& status) const override;
 
     /**
      * Return the number of days in the given extended year of this
      * calendar system.  Subclasses should override this method if they can
      * provide a more correct or more efficient implementation than the
      * default implementation in Calendar.
      * @stable ICU 2.0
      */
     virtual int32_t handleGetYearLength(int32_t eyear) const override;
 
     /**
      * return the length of the given month.
      * @param month    the given month.
      * @param status Fill-in parameter which receives the status of this operation.
      * @return    the length of the given month.
      * @internal
      */
     virtual int32_t monthLength(int32_t month, UErrorCode& status) const;
 
     /**
      * return the length of the month according to the given year.
      * @param month    the given month.
      * @param year     the given year.
      * @return         the length of the month
      * @internal
      */
     virtual int32_t monthLength(int32_t month, int32_t year) const;
 
 #ifndef U_HIDE_INTERNAL_API
     /**
      * return the length of the year field.
      * @return    the length of the year field
      * @internal
      */
   int32_t yearLength() const;
 
 #endif  /* U_HIDE_INTERNAL_API */
 
     /**
      * Return the day number with respect to the epoch.  January 1, 1970 (Gregorian)
      * is day zero.
      * @param status Fill-in parameter which receives the status of this operation.
      * @return       the day number with respect to the epoch.  
      * @internal
      */
     virtual UDate getEpochDay(UErrorCode& status);
 
     /**
      * Subclass API for defining limits of different types.
      * Subclasses must implement this method to return limits for the
      * following fields:
      *
      * <pre>UCAL_ERA
      * UCAL_YEAR
      * UCAL_MONTH
      * UCAL_WEEK_OF_YEAR
      * UCAL_WEEK_OF_MONTH
      * UCAL_DATE (DAY_OF_MONTH on Java)
      * UCAL_DAY_OF_YEAR
      * UCAL_DAY_OF_WEEK_IN_MONTH
      * UCAL_YEAR_WOY
      * UCAL_EXTENDED_YEAR</pre>
      *
      * @param field one of the above field numbers
      * @param limitType one of <code>MINIMUM</code>, <code>GREATEST_MINIMUM</code>,
      * <code>LEAST_MAXIMUM</code>, or <code>MAXIMUM</code>
      * @internal
      */
     virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const override;
 
     /**
      * Return the extended year defined by the current fields.  This will
      * use the UCAL_EXTENDED_YEAR field or the UCAL_YEAR and supra-year fields (such
      * as UCAL_ERA) specific to the calendar system, depending on which set of
      * fields is newer.
      * @param status
      * @return the extended year
      * @internal
      */
     virtual int32_t handleGetExtendedYear(UErrorCode& status) override;
 
     /** 
      * Subclasses may override this to convert from week fields 
      * (YEAR_WOY and WEEK_OF_YEAR) to an extended year in the case
      * where YEAR, EXTENDED_YEAR are not set.
      * The Gregorian implementation assumes a yearWoy in gregorian format, according to the current era.
      * @return the extended year, UCAL_EXTENDED_YEAR
      * @internal
      */
     virtual int32_t handleGetExtendedYearFromWeekFields(int32_t yearWoy, int32_t woy, UErrorCode& status) override;
 
 
     /**
      * Subclasses may override this method to compute several fields
      * specific to each calendar system.  These are:
      *
      * <ul><li>ERA
      * <li>YEAR
      * <li>MONTH
      * <li>DAY_OF_MONTH
      * <li>DAY_OF_YEAR
      * <li>EXTENDED_YEAR</ul>
      *
      * <p>The GregorianCalendar implementation implements
      * a calendar with the specified Julian/Gregorian cutover date.
      * @internal
      */
     virtual void handleComputeFields(int32_t julianDay, UErrorCode &status) override;
 
 #ifndef U_HIDE_INTERNAL_API
     /**
      * The year in this calendar is counting from 1 backward if the era is 0.
      * @return The year in era 0 of this calendar is counting backward from 1.
      * @internal
      */
     virtual bool isEra0CountingBackward() const override { return true; }
 #endif  // U_HIDE_INTERNAL_API
 
  private:
     /**
      * Compute the julian day number of the given year.
      * @param isGregorian    if true, using Gregorian calendar, otherwise using Julian calendar
      * @param year           the given year.
      * @param isLeap         true if the year is a leap year.       
      * @return 
      */
     static double computeJulianDayOfYear(UBool isGregorian, int32_t year,
                                          UBool& isLeap);
     
     /**
      * Validates the values of the set time fields.  True if they're all valid.
      * @return    True if the set time fields are all valid.
      */
     UBool validateFields() const;
 
     /**
      * Validates the value of the given time field.  True if it's valid.
      */
     UBool boundsCheck(int32_t value, UCalendarDateFields field) const;
 
     /**
      * Return the pseudo-time-stamp for two fields, given their
      * individual pseudo-time-stamps.  If either of the fields
      * is unset, then the aggregate is unset.  Otherwise, the
      * aggregate is the later of the two stamps.
      * @param stamp_a    One given field.
      * @param stamp_b    Another given field.
      * @return the pseudo-time-stamp for two fields
      */
     int32_t aggregateStamp(int32_t stamp_a, int32_t stamp_b);
 
     /**
      * The point at which the Gregorian calendar rules are used, measured in
      * milliseconds from the standard epoch.  Default is October 15, 1582
      * (Gregorian) 00:00:00 UTC, that is, October 4, 1582 (Julian) is followed
      * by October 15, 1582 (Gregorian).  This corresponds to Julian day number
      * 2299161. This is measured from the standard epoch, not in Julian Days.
      */
     UDate                fGregorianCutover;
 
     /**
      * Julian day number of the Gregorian cutover
      */
     int32_t             fCutoverJulianDay;
 
     /**
      * Midnight, local time (using this Calendar's TimeZone) at or before the
      * gregorianCutover. This is a pure date value with no time of day or
      * timezone component.
      */
     UDate                 fNormalizedGregorianCutover;// = gregorianCutover;
 
     /**
      * The year of the gregorianCutover, with 0 representing
      * 1 BC, -1 representing 2 BC, etc.
      */
     int32_t fGregorianCutoverYear;// = 1582;
 
     /**
      * Converts time as milliseconds to Julian date. The Julian date used here is not a
      * true Julian date, since it is measured from midnight, not noon.
      *
      * @param millis  The given milliseconds.
      * @return        The Julian date number.
      */
     static double millisToJulianDay(UDate millis);
 
     /**
      * Converts Julian date to time as milliseconds. The Julian date used here is not a
      * true Julian date, since it is measured from midnight, not noon.
      *
      * @param julian  The given Julian date number.
      * @return        Time as milliseconds.
      */
     static UDate julianDayToMillis(double julian);
 
     /**
      * Used by handleComputeJulianDay() and handleComputeMonthStart().
      * Temporary field indicating whether the calendar is currently Gregorian as opposed to Julian.
      */
     UBool fIsGregorian;
 
     /**
      * Used by handleComputeJulianDay() and handleComputeMonthStart().
      * Temporary field indicating that the sense of the gregorian cutover should be inverted
      * to handle certain calculations on and around the cutover date.
      */
     UBool fInvertGregorian;
 
 
  public: // internal implementation
 
     DECLARE_OVERRIDE_SYSTEM_DEFAULT_CENTURY
 
 };
 
 U_NAMESPACE_END
 
 #endif /* #if !UCONFIG_NO_FORMATTING */
 
 #endif /* U_SHOW_CPLUSPLUS_API */
 
 #endif // _GREGOCAL
 //eof
 

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