Move ICU header part 2

public/i18n/unicode/gregocal.h

Index: public/i18n/unicode/gregocal.h
===================================================================
--- public/i18n/unicode/gregocal.h	(revision 211843)
+++ public/i18n/unicode/gregocal.h	(working copy)
@@ -1,823 +0,0 @@
-/*
-* Copyright (C) 1997-2009, 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 !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);
- *     // if no ids were returned, something is wrong. get out.
- *     if (ids == 0 || ids->count(success) == 0) {
- *         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 occured. 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 Calendar* clone(void) const;
-
-    /**
-     * 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;
-
-    /**
-     * (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);
-
-    /**
-     * (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);
-
-    /**
-     * 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;
-
-    /**
-     * 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;
-
-    /**
-     * 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.
-     * @return         the maximum value that this field could have, given the current date.
-     * @deprecated ICU 2.6. Use getActualMaximum(UCalendarDateFields field) instead.
-     */
-    int32_t getActualMaximum(EDateFields field) const;
-
-    /**
-     * 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;
-
-    /**
-     * (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;
-
-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;
-
-    /**
-     * 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);
-
-    /**
-     * Get the calendar type, "gregorian", for use in DateFormatSymbols.
-     *
-     * @return calendar type
-     * @internal
-     */
-    virtual const char * getType() const;
-
-protected:
-
-    /**
-     * (Overrides Calendar) Converts GMT as milliseconds to time field values.
-     * @param status Fill-in parameter which receives the status of this operation.
-     * @stable ICU 2.0
-     */
-
- private:
-    GregorianCalendar(); // 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;
-
-    /**
-     * 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)  ;
-
-    /**
-     * 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;
-
-    /**
-     * 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;
-
-    /**
-     * 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;
-    
-    /**
-     * 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);
-
-    /**
-     * 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;
-
-    /**
-     * 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();
-
-    /** 
-     * 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);
-
-
-    /**
-     * 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);
-
- 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.
-     * @internal
-     */
-    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;
-
-    /**
-     * The year of the gregorianCutover, with 0 representing
-     * 1 BC, -1 representing 2 BC, etc.
-     */
-    int32_t fGregorianCutoverJulianDay;// = 2299161;
-
-    /**
-     * 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
-
-    /**
-     * @internal 
-     * @return TRUE if this calendar has the notion of a default century
-     */
-    virtual UBool haveDefaultCentury() const;
-
-    /**
-     * @internal
-     * @return the start of the default century
-     */
-    virtual UDate defaultCenturyStart() const;
-
-    /**
-     * @internal 
-     * @return the beginning year of the default century
-     */
-    virtual int32_t defaultCenturyStartYear() const;
-
- private:
-    /**
-     * The system maintains a static default century start date.  This is initialized
-     * the first time it is used.  Before then, it is set to SYSTEM_DEFAULT_CENTURY to
-     * indicate an uninitialized state.  Once the system default century date and year
-     * are set, they do not change.
-     */
-    static UDate         fgSystemDefaultCenturyStart;
-
-    /**
-     * See documentation for systemDefaultCenturyStart.
-     */
-    static int32_t          fgSystemDefaultCenturyStartYear;
-
-    /**
-     * Default value that indicates the defaultCenturyStartYear is unitialized
-     */
-    static const int32_t    fgSystemDefaultCenturyYear;
-
-    /**
-     * Default value that indicates the UDate of the beginning of the system default century
-     */
-    static const UDate        fgSystemDefaultCentury;
-
-    /**
-     * Returns the beginning date of the 100-year window that dates with 2-digit years
-     * are considered to fall within.
-     * @return    the beginning date of the 100-year window that dates with 2-digit years
-     *            are considered to fall within.
-     */
-    UDate         internalGetDefaultCenturyStart(void) const;
-
-    /**
-     * Returns the first year of the 100-year window that dates with 2-digit years
-     * are considered to fall within.
-     * @return    the first year of the 100-year window that dates with 2-digit years
-     *            are considered to fall within.
-     */
-    int32_t          internalGetDefaultCenturyStartYear(void) const;
-
-    /**
-     * Initializes the 100-year window that dates with 2-digit years are considered
-     * to fall within so that its start date is 80 years before the current time.
-     */
-    static void  initializeSystemDefaultCentury(void);
-
-};
-
-U_NAMESPACE_END
-
-#endif /* #if !UCONFIG_NO_FORMATTING */
-
-#endif // _GREGOCAL
-//eof
-