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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(NULL, 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(void) 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;
/**
* (Overrides Calendar) Return true if the current date for this Calendar is in
* Daylight Savings Time. Recognizes DST_OFFSET, if it is set.
*
* @param status Fill-in parameter which receives the status of this operation.
* @return True if the current date for this Calendar is in Daylight Savings Time,
* false, otherwise.
* @stable ICU 2.0
*/
virtual UBool inDaylightTime(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(void) 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(void);
/**
* 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
* @return the Julian day number of the day before the first
* day of the given month and year
* @internal
*/
virtual int32_t handleComputeMonthStart(int32_t eyear, int32_t month,
UBool useMonth) 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
* @return julian day specified by calendar fields.
* @internal
*/
virtual int32_t handleComputeJulianDay(UCalendarDateFields bestField) 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) 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.
* @return the length of the given month.
* @internal
*/
virtual int32_t monthLength(int32_t month) 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 given year.
* @param year the given year.
* @return the length of the given year.
* @internal
*/
int32_t yearLength(int32_t year) const;
/**
* return the length of the year field.
* @return the length of the year field
* @internal
*/
int32_t yearLength(void) const;
/**
* After adjustments such as add(MONTH), add(YEAR), we don't want the
* month to jump around. E.g., we don't want Jan 31 + 1 month to go to Mar
* 3, we want it to go to Feb 28. Adjustments which might run into this
* problem call this method to retain the proper month.
* @internal
*/
void pinDayOfMonth(void);
#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.
* @return the extended year
* @internal
*/
virtual int32_t handleGetExtendedYear() 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) 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;
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(void) 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
/**
* @return true if this calendar has the notion of a default century
* @internal
*/
virtual UBool haveDefaultCentury() const override;
/**
* @return the start of the default century
* @internal
*/
virtual UDate defaultCenturyStart() const override;
/**
* @return the beginning year of the default century
* @internal
*/
virtual int32_t defaultCenturyStartYear() const override;
};
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif /* U_SHOW_CPLUSPLUS_API */
#endif // _GREGOCAL
//eof