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	// © 2016 and later: Unicode, Inc. and others.
	// License & terms of use: http://www.unicode.org/copyright.html
	/*
	********************************************************************************
	* Copyright (C) 1997-2014, International Business Machines
	* Corporation and others. All Rights Reserved.
	********************************************************************************
	*
	* File CALENDAR.H
	*
	* Modification History:
	*
	* Date Name Description
	* 04/22/97 aliu Expanded and corrected comments and other header
	* contents.
	* 05/01/97 aliu Made equals(), before(), after() arguments const.
	* 05/20/97 aliu Replaced fAreFieldsSet with fAreFieldsInSync and
	* fAreAllFieldsSet.
	* 07/27/98 stephen Sync up with JDK 1.2
	* 11/15/99 weiv added YEAR_WOY and DOW_LOCAL
	* to EDateFields
	* 8/19/2002 srl Removed Javaisms
	* 11/07/2003 srl Update, clean up documentation.
	********************************************************************************
	*/

	#ifndef CALENDAR_H
	#define CALENDAR_H

	#include "unicode/utypes.h"

	#if U_SHOW_CPLUSPLUS_API

	/**
	* \file
	* \brief C++ API: Calendar object
	*/
	#if !UCONFIG_NO_FORMATTING

	#include "unicode/uobject.h"
	#include "unicode/locid.h"
	#include "unicode/timezone.h"
	#include "unicode/ucal.h"
	#include "unicode/umisc.h"

	U_NAMESPACE_BEGIN

	class ICUServiceFactory;

	// Do not conditionalize the following with #ifndef U_HIDE_INTERNAL_API,
	// it is a return type for a virtual method (@internal)
	/**
	* @internal
	*/
	typedef int32_t UFieldResolutionTable[12][8];

	class BasicTimeZone;
	/**
	* `Calendar` is an abstract base class for converting between
	* a `UDate` object and a set of integer fields such as
	* `YEAR`, `MONTH`, `DAY`, `HOUR`, and so on.
	* (A `UDate` object represents a specific instant in
	* time with millisecond precision. See UDate
	* for information about the `UDate` class.)
	*
	* Subclasses of `Calendar` interpret a `UDate`
	* according to the rules of a specific calendar system.
	* The most commonly used subclass of `Calendar` is
	* `GregorianCalendar`. Other subclasses could represent
	* the various types of lunar calendars in use in many parts of the world.
	*
	* NOTE: (ICU 2.6) The subclass interface should be considered unstable -
	* it WILL change.
	*
	* Like other locale-sensitive classes, `Calendar` provides a
	* static method, `createInstance`, for getting a generally useful
	* object of this type. `Calendar`'s `createInstance` method
	* returns the appropriate `Calendar` subclass whose
	* time fields have been initialized with the current date and time:
	*
	* Calendar *rightNow = Calendar::createInstance(errCode);
	*
	* A `Calendar` object can produce all the time field values
	* needed to implement the date-time formatting for a particular language
	* and calendar style (for example, Japanese-Gregorian, Japanese-Traditional).
	*
	* When computing a `UDate` from time fields, some special circumstances
	* may arise: there may be insufficient information to compute the
	* `UDate` (such as only year and month but no day in the month),
	* there may be inconsistent information (such as "Tuesday, July 15, 1996"
	* -- July 15, 1996 is actually a Monday), or the input time might be ambiguous
	* because of time zone transition.
	*
	* Insufficient information. The calendar will use default
	* information to specify the missing fields. This may vary by calendar; for
	* the Gregorian calendar, the default for a field is the same as that of the
	* start of the epoch: i.e., YEAR = 1970, MONTH = JANUARY, DATE = 1, etc.
	*
	* Inconsistent information. If fields conflict, the calendar
	* will give preference to fields set more recently. For example, when
	* determining the day, the calendar will look for one of the following
	* combinations of fields. The most recent combination, as determined by the
	* most recently set single field, will be used.
	*
	* MONTH + DAY_OF_MONTH
	* MONTH + WEEK_OF_MONTH + DAY_OF_WEEK
	* MONTH + DAY_OF_WEEK_IN_MONTH + DAY_OF_WEEK
	* DAY_OF_YEAR
	* DAY_OF_WEEK + WEEK_OF_YEAR
	*
	* For the time of day:
	*
	* HOUR_OF_DAY
	* AM_PM + HOUR
	*
	* Ambiguous Wall Clock Time. When time offset from UTC has
	* changed, it produces an ambiguous time slot around the transition. For example,
	* many US locations observe daylight saving time. On the date switching to daylight
	* saving time in US, wall clock time jumps from 12:59 AM (standard) to 2:00 AM
	* (daylight). Therefore, wall clock time from 1:00 AM to 1:59 AM do not exist on
	* the date. When the input wall time fall into this missing time slot, the ICU
	* Calendar resolves the time using the UTC offset before the transition by default.
	* In this example, 1:30 AM is interpreted as 1:30 AM standard time (non-exist),
	* so the final result will be 2:30 AM daylight time.
	*
	* On the date switching back to standard time, wall clock time is moved back one
	* hour at 2:00 AM. So wall clock time from 1:00 AM to 1:59 AM occur twice. In this
	* case, the ICU Calendar resolves the time using the UTC offset after the transition
	* by default. For example, 1:30 AM on the date is resolved as 1:30 AM standard time.
	*
	* Ambiguous wall clock time resolution behaviors can be customized by Calendar APIs
	* {@link #setRepeatedWallTimeOption} and {@link #setSkippedWallTimeOption}.
	* These methods are available in ICU 49 or later versions.
	*
	* Note: for some non-Gregorian calendars, different
	* fields may be necessary for complete disambiguation. For example, a full
	* specification of the historical Arabic astronomical calendar requires year,
	* month, day-of-month and day-of-week in some cases.
	*
	* Note: There are certain possible ambiguities in
	* interpretation of certain singular times, which are resolved in the
	* following ways:
	*
	* 1. 24:00:00 "belongs" to the following day. That is,
	* 23:59 on Dec 31, 1969 < 24:00 on Jan 1, 1970 < 24:01:00 on Jan 1, 1970
	* 2. Although historically not precise, midnight also belongs to "am",
	* and noon belongs to "pm", so on the same day,
	* 12:00 am (midnight) < 12:01 am, and 12:00 pm (noon) < 12:01 pm
	*
	* The date or time format strings are not part of the definition of a
	* calendar, as those must be modifiable or overridable by the user at
	* runtime. Use `DateFormat` to format dates.
	*
	* `Calendar` provides an API for field "rolling", where fields
	* can be incremented or decremented, but wrap around. For example, rolling the
	* month up in the date December 12, 1996 results in
	* January 12, 1996.
	*
	* `Calendar` also provides a date arithmetic function for
	* adding the specified (signed) amount of time to a particular time field.
	* For example, subtracting 5 days from the date `September 12, 1996`
	* results in `September 7, 1996`.
	*
	* *Supported range*
	*
	* The allowable range of `Calendar` has been narrowed. `GregorianCalendar` used
	* to attempt to support the range of dates with millisecond values from
	* `Long.MIN_VALUE` to `Long.MAX_VALUE`. The new `Calendar` protocol specifies the
	* maximum range of supportable dates as those having Julian day numbers
	* of `-0x7F000000` to `+0x7F000000`. This corresponds to years from ~5,800,000 BCE
	* to ~5,800,000 CE. Programmers should use the protected constants in `Calendar` to
	* specify an extremely early or extremely late date.
	*
	* <p>
	* The Japanese calendar uses a combination of era name and year number.
	* When an emperor of Japan abdicates and a new emperor ascends the throne,
	* a new era is declared and year number is reset to 1. Even if the date of
	* abdication is scheduled ahead of time, the new era name might not be
	* announced until just before the date. In such case, ICU4C may include
	* a start date of future era without actual era name, but not enabled
	* by default. ICU4C users who want to test the behavior of the future era
	* can enable the tentative era by:
	* <ul>
	* <li>Environment variable <code>ICU_ENABLE_TENTATIVE_ERA=true</code>.</li>
	* </ul>
	*
	* @stable ICU 2.0
	*/
	class U_I18N_API Calendar : public UObject {
	public:
	#ifndef U_FORCE_HIDE_DEPRECATED_API
	/**
	* Field IDs for date and time. Used to specify date/time fields. ERA is calendar
	* specific. Example ranges given are for illustration only; see specific Calendar
	* subclasses for actual ranges.
	* @deprecated ICU 2.6. Use C enum UCalendarDateFields defined in ucal.h
	*/
	enum EDateFields {
	#ifndef U_HIDE_DEPRECATED_API
	/*
	* ERA may be defined on other platforms. To avoid any potential problems undefined it here.
	*/
	#ifdef ERA
	#undef ERA
	#endif
	ERA, // Example: 0..1
	YEAR, // Example: 1..big number
	MONTH, // Example: 0..11
	WEEK_OF_YEAR, // Example: 1..53
	WEEK_OF_MONTH, // Example: 1..4
	DATE, // Example: 1..31
	DAY_OF_YEAR, // Example: 1..365
	DAY_OF_WEEK, // Example: 1..7
	DAY_OF_WEEK_IN_MONTH, // Example: 1..4, may be specified as -1
	AM_PM, // Example: 0..1
	HOUR, // Example: 0..11
	HOUR_OF_DAY, // Example: 0..23
	MINUTE, // Example: 0..59
	SECOND, // Example: 0..59
	MILLISECOND, // Example: 0..999
	ZONE_OFFSET, // Example: -12U_MILLIS_PER_HOUR..12U_MILLIS_PER_HOUR
	DST_OFFSET, // Example: 0 or U_MILLIS_PER_HOUR
	YEAR_WOY, // 'Y' Example: 1..big number - Year of Week of Year
	DOW_LOCAL, // 'e' Example: 1..7 - Day of Week / Localized

	EXTENDED_YEAR,
	JULIAN_DAY,
	MILLISECONDS_IN_DAY,
	IS_LEAP_MONTH,

	FIELD_COUNT = UCAL_FIELD_COUNT // See ucal.h for other fields.
	#endif /* U_HIDE_DEPRECATED_API */
	};
	#endif // U_FORCE_HIDE_DEPRECATED_API

	#ifndef U_HIDE_DEPRECATED_API
	/**
	* Useful constant for days of week. Note: Calendar day-of-week is 1-based. Clients
	* who create locale resources for the field of first-day-of-week should be aware of
	* this. For instance, in US locale, first-day-of-week is set to 1, i.e., SUNDAY.
	* @deprecated ICU 2.6. Use C enum UCalendarDaysOfWeek defined in ucal.h
	*/
	enum EDaysOfWeek {
	SUNDAY = 1,
	MONDAY,
	TUESDAY,
	WEDNESDAY,
	THURSDAY,
	FRIDAY,
	SATURDAY
	};

	/**
	* Useful constants for month. Note: Calendar month is 0-based.
	* @deprecated ICU 2.6. Use C enum UCalendarMonths defined in ucal.h
	*/
	enum EMonths {
	JANUARY,
	FEBRUARY,
	MARCH,
	APRIL,
	MAY,
	JUNE,
	JULY,
	AUGUST,
	SEPTEMBER,
	OCTOBER,
	NOVEMBER,
	DECEMBER,
	UNDECIMBER
	};

	/**
	* Useful constants for hour in 12-hour clock. Used in GregorianCalendar.
	* @deprecated ICU 2.6. Use C enum UCalendarAMPMs defined in ucal.h
	*/
	enum EAmpm {
	AM,
	PM
	};
	#endif /* U_HIDE_DEPRECATED_API */

	/**
	* destructor
	* @stable ICU 2.0
	*/
	virtual ~Calendar();

	/**
	* Create and return a polymorphic copy of this calendar.
	*
	* @return a polymorphic copy of this calendar.
	* @stable ICU 2.0
	*/
	virtual Calendar* clone() const = 0;

	/**
	* Creates a Calendar using the default timezone and locale. Clients are responsible
	* for deleting the object returned.
	*
	* @param success Indicates the success/failure of Calendar creation. Filled in
	* with U_ZERO_ERROR if created successfully, set to a failure result
	* otherwise. U_MISSING_RESOURCE_ERROR will be returned if the resource data
	* requests a calendar type which has not been installed.
	* @return A Calendar if created successfully. nullptr otherwise.
	* @stable ICU 2.0
	*/
	static Calendar* U_EXPORT2 createInstance(UErrorCode& success);

	/**
	* Creates a Calendar using the given timezone and the default locale.
	* The Calendar takes ownership of zoneToAdopt; the
	* client must not delete it.
	*
	* @param zoneToAdopt The given timezone to be adopted.
	* @param success Indicates the success/failure of Calendar creation. Filled in
	* with U_ZERO_ERROR if created successfully, set to a failure result
	* otherwise.
	* @return A Calendar if created successfully. nullptr otherwise.
	* @stable ICU 2.0
	*/
	static Calendar* U_EXPORT2 createInstance(TimeZone* zoneToAdopt, UErrorCode& success);

	/**
	* Creates a Calendar using the given timezone and the default locale. The TimeZone
	* is _not_ adopted; the client is still responsible for deleting it.
	*
	* @param zone The timezone.
	* @param success Indicates the success/failure of Calendar creation. Filled in
	* with U_ZERO_ERROR if created successfully, set to a failure result
	* otherwise.
	* @return A Calendar if created successfully. nullptr otherwise.
	* @stable ICU 2.0
	*/
	static Calendar* U_EXPORT2 createInstance(const TimeZone& zone, UErrorCode& success);

	/**
	* Creates a Calendar using the default timezone and the given locale.
	*
	* @param aLocale The given locale.
	* @param success Indicates the success/failure of Calendar creation. Filled in
	* with U_ZERO_ERROR if created successfully, set to a failure result
	* otherwise.
	* @return A Calendar if created successfully. nullptr otherwise.
	* @stable ICU 2.0
	*/
	static Calendar* U_EXPORT2 createInstance(const Locale& aLocale, UErrorCode& success);

	/**
	* Creates a Calendar using the given timezone and given locale.
	* The Calendar takes ownership of zoneToAdopt; the
	* client must not delete it.
	*
	* @param zoneToAdopt The given timezone to be adopted.
	* @param aLocale The given locale.
	* @param success Indicates the success/failure of Calendar creation. Filled in
	* with U_ZERO_ERROR if created successfully, set to a failure result
	* otherwise.
	* @return A Calendar if created successfully. nullptr otherwise.
	* @stable ICU 2.0
	*/
	static Calendar* U_EXPORT2 createInstance(TimeZone* zoneToAdopt, const Locale& aLocale, UErrorCode& success);

	/**
	* Gets a Calendar using the given timezone and given locale. The TimeZone
	* is _not_ adopted; the client is still responsible for deleting it.
	*
	* @param zone The given timezone.
	* @param aLocale The given locale.
	* @param success Indicates the success/failure of Calendar creation. Filled in
	* with U_ZERO_ERROR if created successfully, set to a failure result
	* otherwise.
	* @return A Calendar if created successfully. nullptr otherwise.
	* @stable ICU 2.0
	*/
	static Calendar* U_EXPORT2 createInstance(const TimeZone& zone, const Locale& aLocale, UErrorCode& success);

	/**
	* Returns a list of the locales for which Calendars are installed.
	*
	* @param count Number of locales returned.
	* @return An array of Locale objects representing the set of locales for which
	* Calendars are installed. The system retains ownership of this list;
	* the caller must NOT delete it. Does not include user-registered Calendars.
	* @stable ICU 2.0
	*/
	static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count);


	/**
	* Given a key and a locale, returns an array of string values in a preferred
	* order that would make a difference. These are all and only those values where
	* the open (creation) of the service with the locale formed from the input locale
	* plus input keyword and that value has different behavior than creation with the
	* input locale alone.
	* @param key one of the keys supported by this service. For now, only
	* "calendar" is supported.
	* @param locale the locale
	* @param commonlyUsed if set to true it will return only commonly used values
	* with the given locale in preferred order. Otherwise,
	* it will return all the available values for the locale.
	* @param status ICU Error Code
	* @return a string enumeration over keyword values for the given key and the locale.
	* @stable ICU 4.2
	*/
	static StringEnumeration* U_EXPORT2 getKeywordValuesForLocale(const char* key,
	const Locale& locale, UBool commonlyUsed, UErrorCode& status);

	/**
	* Returns the current UTC (GMT) time measured in milliseconds since 0:00:00 on 1/1/70
	* (derived from the system time).
	*
	* @return The current UTC time in milliseconds.
	* @stable ICU 2.0
	*/
	static UDate U_EXPORT2 getNow(void);

	/**
	* Gets this Calendar's time as milliseconds. May involve recalculation of time due
	* to previous calls to set time field values. The time specified is non-local UTC
	* (GMT) time. Although this method is const, this object may actually be changed
	* (semantically const).
	*
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @return The current time in UTC (GMT) time, or zero if the operation
	* failed.
	* @stable ICU 2.0
	*/
	inline UDate getTime(UErrorCode& status) const { return getTimeInMillis(status); }

	/**
	* Sets this Calendar's current time with the given UDate. The time specified should
	* be in non-local UTC (GMT) time.
	*
	* @param date The given UDate in UTC (GMT) time.
	* @param status Output param set to success/failure code on exit. If any value
	* set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @stable ICU 2.0
	*/
	inline void setTime(UDate date, UErrorCode& status) { setTimeInMillis(date, status); }

	/**
	* Compares the equality of two Calendar objects. Objects of different subclasses
	* are considered unequal. This comparison is very exacting; two Calendar objects
	* must be in exactly the same state to be considered equal. To compare based on the
	* represented time, use equals() instead.
	*
	* @param that The Calendar object to be compared with.
	* @return true if the given Calendar is the same as this Calendar; false
	* otherwise.
	* @stable ICU 2.0
	*/
	virtual bool operator==(const Calendar& that) const;

	/**
	* Compares the inequality of two Calendar objects.
	*
	* @param that The Calendar object to be compared with.
	* @return true if the given Calendar is not the same as this Calendar; false
	* otherwise.
	* @stable ICU 2.0
	*/
	bool operator!=(const Calendar& that) const {return !operator==(that);}

	/**
	* Returns true if the given Calendar object is equivalent to this
	* one. An equivalent Calendar will behave exactly as this one
	* does, but it may be set to a different time. By contrast, for
	* the operator==() method to return true, the other Calendar must
	* be set to the same time.
	*
	* @param other the Calendar to be compared with this Calendar
	* @stable ICU 2.4
	*/
	virtual UBool isEquivalentTo(const Calendar& other) const;

	/**
	* Compares the Calendar time, whereas Calendar::operator== compares the equality of
	* Calendar objects.
	*
	* @param when The Calendar to be compared with this Calendar. Although this is a
	* const parameter, the object may be modified physically
	* (semantically const).
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @return True if the current time of this Calendar is equal to the time of
	* Calendar when; false otherwise.
	* @stable ICU 2.0
	*/
	UBool equals(const Calendar& when, UErrorCode& status) const;

	/**
	* Returns true if this Calendar's current time is before "when"'s current time.
	*
	* @param when The Calendar to be compared with this Calendar. Although this is a
	* const parameter, the object may be modified physically
	* (semantically const).
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @return True if the current time of this Calendar is before the time of
	* Calendar when; false otherwise.
	* @stable ICU 2.0
	*/
	UBool before(const Calendar& when, UErrorCode& status) const;

	/**
	* Returns true if this Calendar's current time is after "when"'s current time.
	*
	* @param when The Calendar to be compared with this Calendar. Although this is a
	* const parameter, the object may be modified physically
	* (semantically const).
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @return True if the current time of this Calendar is after the time of
	* Calendar when; false otherwise.
	* @stable ICU 2.0
	*/
	UBool after(const Calendar& when, UErrorCode& status) const;

	#ifndef U_FORCE_HIDE_DEPRECATED_API
	/**
	* UDate Arithmetic function. Adds the specified (signed) amount of time to the given
	* time field, based on the calendar's rules. For example, to subtract 5 days from
	* the current time of the calendar, call add(Calendar::DATE, -5). When adding on
	* the month or Calendar::MONTH field, other fields like date might conflict and
	* need to be changed. For instance, adding 1 month on the date 01/31/96 will result
	* in 02/29/96.
	* Adding a positive value always means moving forward in time, so for the Gregorian calendar,
	* starting with 100 BC and adding +1 to year results in 99 BC (even though this actually reduces
	* the numeric value of the field itself).
	*
	* @param field Specifies which date field to modify.
	* @param amount The amount of time to be added to the field, in the natural unit
	* for that field (e.g., days for the day fields, hours for the hour
	* field.)
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @deprecated ICU 2.6. use add(UCalendarDateFields field, int32_t amount, UErrorCode& status) instead.
	*/
	virtual void add(EDateFields field, int32_t amount, UErrorCode& status);
	#endif // U_FORCE_HIDE_DEPRECATED_API

	/**
	* UDate Arithmetic function. Adds the specified (signed) amount of time to the given
	* time field, based on the calendar's rules. For example, to subtract 5 days from
	* the current time of the calendar, call add(Calendar::DATE, -5). When adding on
	* the month or Calendar::MONTH field, other fields like date might conflict and
	* need to be changed. For instance, adding 1 month on the date 01/31/96 will result
	* in 02/29/96.
	* Adding a positive value always means moving forward in time, so for the Gregorian calendar,
	* starting with 100 BC and adding +1 to year results in 99 BC (even though this actually reduces
	* the numeric value of the field itself).
	*
	* @param field Specifies which date field to modify.
	* @param amount The amount of time to be added to the field, in the natural unit
	* for that field (e.g., days for the day fields, hours for the hour
	* field.)
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @stable ICU 2.6.
	*/
	virtual void add(UCalendarDateFields field, int32_t amount, UErrorCode& status);

	#ifndef U_HIDE_DEPRECATED_API
	/**
	* Time Field Rolling function. Rolls (up/down) a single unit of time on the given
	* time field. For example, to roll the current date up by one day, call
	* roll(Calendar::DATE, true). When rolling on the year or Calendar::YEAR field, it
	* will roll the year value in the range between getMinimum(Calendar::YEAR) and the
	* value returned by getMaximum(Calendar::YEAR). When rolling on the month or
	* Calendar::MONTH field, other fields like date might conflict and, need to be
	* changed. For instance, rolling the month up on the date 01/31/96 will result in
	* 02/29/96. Rolling up always means rolling forward in time (unless the limit of the
	* field is reached, in which case it may pin or wrap), so for Gregorian calendar,
	* starting with 100 BC and rolling the year up results in 99 BC.
	* When eras have a definite beginning and end (as in the Chinese calendar, or as in
	* most eras in the Japanese calendar) then rolling the year past either limit of the
	* era will cause the year to wrap around. When eras only have a limit at one end,
	* then attempting to roll the year past that limit will result in pinning the year
	* at that limit. Note that for most calendars in which era 0 years move forward in
	* time (such as Buddhist, Hebrew, or Islamic), it is possible for add or roll to
	* result in negative years for era 0 (that is the only way to represent years before
	* the calendar epoch).
	* When rolling on the hour-in-day or Calendar::HOUR_OF_DAY field, it will roll the
	* hour value in the range between 0 and 23, which is zero-based.
	* <P>
	* NOTE: Do not use this method -- use roll(EDateFields, int, UErrorCode&) instead.
	*
	* @param field The time field.
	* @param up Indicates if the value of the specified time field is to be rolled
	* up or rolled down. Use true if rolling up, false otherwise.
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @deprecated ICU 2.6. Use roll(UCalendarDateFields field, UBool up, UErrorCode& status) instead.
	*/
	inline void roll(EDateFields field, UBool up, UErrorCode& status);
	#endif /* U_HIDE_DEPRECATED_API */

	/**
	* Time Field Rolling function. Rolls (up/down) a single unit of time on the given
	* time field. For example, to roll the current date up by one day, call
	* roll(Calendar::DATE, true). When rolling on the year or Calendar::YEAR field, it
	* will roll the year value in the range between getMinimum(Calendar::YEAR) and the
	* value returned by getMaximum(Calendar::YEAR). When rolling on the month or
	* Calendar::MONTH field, other fields like date might conflict and, need to be
	* changed. For instance, rolling the month up on the date 01/31/96 will result in
	* 02/29/96. Rolling up always means rolling forward in time (unless the limit of the
	* field is reached, in which case it may pin or wrap), so for Gregorian calendar,
	* starting with 100 BC and rolling the year up results in 99 BC.
	* When eras have a definite beginning and end (as in the Chinese calendar, or as in
	* most eras in the Japanese calendar) then rolling the year past either limit of the
	* era will cause the year to wrap around. When eras only have a limit at one end,
	* then attempting to roll the year past that limit will result in pinning the year
	* at that limit. Note that for most calendars in which era 0 years move forward in
	* time (such as Buddhist, Hebrew, or Islamic), it is possible for add or roll to
	* result in negative years for era 0 (that is the only way to represent years before
	* the calendar epoch).
	* When rolling on the hour-in-day or Calendar::HOUR_OF_DAY field, it will roll the
	* hour value in the range between 0 and 23, which is zero-based.
	* <P>
	* NOTE: Do not use this method -- use roll(UCalendarDateFields, int, UErrorCode&) instead.
	*
	* @param field The time field.
	* @param up Indicates if the value of the specified time field is to be rolled
	* up or rolled down. Use true if rolling up, false otherwise.
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @stable ICU 2.6.
	*/
	inline void roll(UCalendarDateFields field, UBool up, UErrorCode& status);

	#ifndef U_FORCE_HIDE_DEPRECATED_API
	/**
	* Time Field Rolling function. Rolls by the given amount on the given
	* time field. For example, to roll the current date up by one day, call
	* roll(Calendar::DATE, +1, status). When rolling on the month or
	* Calendar::MONTH field, other fields like date might conflict and, need to be
	* changed. For instance, rolling the month up on the date 01/31/96 will result in
	* 02/29/96. Rolling by a positive value always means rolling forward in time (unless
	* the limit of the field is reached, in which case it may pin or wrap), so for
	* Gregorian calendar, starting with 100 BC and rolling the year by + 1 results in 99 BC.
	* When eras have a definite beginning and end (as in the Chinese calendar, or as in
	* most eras in the Japanese calendar) then rolling the year past either limit of the
	* era will cause the year to wrap around. When eras only have a limit at one end,
	* then attempting to roll the year past that limit will result in pinning the year
	* at that limit. Note that for most calendars in which era 0 years move forward in
	* time (such as Buddhist, Hebrew, or Islamic), it is possible for add or roll to
	* result in negative years for era 0 (that is the only way to represent years before
	* the calendar epoch).
	* When rolling on the hour-in-day or Calendar::HOUR_OF_DAY field, it will roll the
	* hour value in the range between 0 and 23, which is zero-based.
	* <P>
	* The only difference between roll() and add() is that roll() does not change
	* the value of more significant fields when it reaches the minimum or maximum
	* of its range, whereas add() does.
	*
	* @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);
	#endif // U_FORCE_HIDE_DEPRECATED_API

	/**
	* Time Field Rolling function. Rolls by the given amount on the given
	* time field. For example, to roll the current date up by one day, call
	* roll(Calendar::DATE, +1, status). When rolling on the month or
	* Calendar::MONTH field, other fields like date might conflict and, need to be
	* changed. For instance, rolling the month up on the date 01/31/96 will result in
	* 02/29/96. Rolling by a positive value always means rolling forward in time (unless
	* the limit of the field is reached, in which case it may pin or wrap), so for
	* Gregorian calendar, starting with 100 BC and rolling the year by + 1 results in 99 BC.
	* When eras have a definite beginning and end (as in the Chinese calendar, or as in
	* most eras in the Japanese calendar) then rolling the year past either limit of the
	* era will cause the year to wrap around. When eras only have a limit at one end,
	* then attempting to roll the year past that limit will result in pinning the year
	* at that limit. Note that for most calendars in which era 0 years move forward in
	* time (such as Buddhist, Hebrew, or Islamic), it is possible for add or roll to
	* result in negative years for era 0 (that is the only way to represent years before
	* the calendar epoch).
	* When rolling on the hour-in-day or Calendar::HOUR_OF_DAY field, it will roll the
	* hour value in the range between 0 and 23, which is zero-based.
	* <P>
	* The only difference between roll() and add() is that roll() does not change
	* the value of more significant fields when it reaches the minimum or maximum
	* of its range, whereas add() does.
	*
	* @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);

	#ifndef U_FORCE_HIDE_DEPRECATED_API
	/**
	* Return the difference between the given time and the time this
	* calendar object is set to. If this calendar is set
	* <em>before</em> the given time, the returned value will be
	* positive. If this calendar is set <em>after</em> the given
	* time, the returned value will be negative. The
	* <code>field</code> parameter specifies the units of the return
	* value. For example, if <code>fieldDifference(when,
	* Calendar::MONTH)</code> returns 3, then this calendar is set to
	* 3 months before <code>when</code>, and possibly some addition
	* time less than one month.
	*
	* <p>As a side effect of this call, this calendar is advanced
	* toward <code>when</code> by the given amount. That is, calling
	* this method has the side effect of calling <code>add(field,
	* n)</code>, where <code>n</code> is the return value.
	*
	* <p>Usage: To use this method, call it first with the largest
	* field of interest, then with progressively smaller fields. For
	* example:
	*
	* <pre>
	* int y = cal->fieldDifference(when, Calendar::YEAR, err);
	* int m = cal->fieldDifference(when, Calendar::MONTH, err);
	* int d = cal->fieldDifference(when, Calendar::DATE, err);</pre>
	*
	* computes the difference between <code>cal</code> and
	* <code>when</code> in years, months, and days.
	*
	* <p>Note: <code>fieldDifference()</code> is
	* <em>asymmetrical</em>. That is, in the following code:
	*
	* <pre>
	* cal->setTime(date1, err);
	* int m1 = cal->fieldDifference(date2, Calendar::MONTH, err);
	* int d1 = cal->fieldDifference(date2, Calendar::DATE, err);
	* cal->setTime(date2, err);
	* int m2 = cal->fieldDifference(date1, Calendar::MONTH, err);
	* int d2 = cal->fieldDifference(date1, Calendar::DATE, err);</pre>
	*
	* one might expect that <code>m1 == -m2 && d1 == -d2</code>.
	* However, this is not generally the case, because of
	* irregularities in the underlying calendar system (e.g., the
	* Gregorian calendar has a varying number of days per month).
	*
	* @param when the date to compare this calendar's time to
	* @param field the field in which to compute the result
	* @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.
	* @return the difference, either positive or negative, between
	* this calendar's time and <code>when</code>, in terms of
	* <code>field</code>.
	* @deprecated ICU 2.6. Use fieldDifference(UDate when, UCalendarDateFields field, UErrorCode& status).
	*/
	virtual int32_t fieldDifference(UDate when, EDateFields field, UErrorCode& status);
	#endif // U_FORCE_HIDE_DEPRECATED_API

	/**
	* Return the difference between the given time and the time this
	* calendar object is set to. If this calendar is set
	* <em>before</em> the given time, the returned value will be
	* positive. If this calendar is set <em>after</em> the given
	* time, the returned value will be negative. The
	* <code>field</code> parameter specifies the units of the return
	* value. For example, if <code>fieldDifference(when,
	* Calendar::MONTH)</code> returns 3, then this calendar is set to
	* 3 months before <code>when</code>, and possibly some addition
	* time less than one month.
	*
	* <p>As a side effect of this call, this calendar is advanced
	* toward <code>when</code> by the given amount. That is, calling
	* this method has the side effect of calling <code>add(field,
	* n)</code>, where <code>n</code> is the return value.
	*
	* <p>Usage: To use this method, call it first with the largest
	* field of interest, then with progressively smaller fields. For
	* example:
	*
	* <pre>
	* int y = cal->fieldDifference(when, Calendar::YEAR, err);
	* int m = cal->fieldDifference(when, Calendar::MONTH, err);
	* int d = cal->fieldDifference(when, Calendar::DATE, err);</pre>
	*
	* computes the difference between <code>cal</code> and
	* <code>when</code> in years, months, and days.
	*
	* <p>Note: <code>fieldDifference()</code> is
	* <em>asymmetrical</em>. That is, in the following code:
	*
	* <pre>
	* cal->setTime(date1, err);
	* int m1 = cal->fieldDifference(date2, Calendar::MONTH, err);
	* int d1 = cal->fieldDifference(date2, Calendar::DATE, err);
	* cal->setTime(date2, err);
	* int m2 = cal->fieldDifference(date1, Calendar::MONTH, err);
	* int d2 = cal->fieldDifference(date1, Calendar::DATE, err);</pre>
	*
	* one might expect that <code>m1 == -m2 && d1 == -d2</code>.
	* However, this is not generally the case, because of
	* irregularities in the underlying calendar system (e.g., the
	* Gregorian calendar has a varying number of days per month).
	*
	* @param when the date to compare this calendar's time to
	* @param field the field in which to compute the result
	* @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.
	* @return the difference, either positive or negative, between
	* this calendar's time and <code>when</code>, in terms of
	* <code>field</code>.
	* @stable ICU 2.6.
	*/
	virtual int32_t fieldDifference(UDate when, UCalendarDateFields field, UErrorCode& status);

	/**
	* Sets the calendar's time zone to be the one passed in. The Calendar takes ownership
	* of the TimeZone; the caller is no longer responsible for deleting it. If the
	* given time zone is nullptr, this function has no effect.
	*
	* @param value The given time zone.
	* @stable ICU 2.0
	*/
	void adoptTimeZone(TimeZone* value);

	/**
	* Sets the calendar's time zone to be the same as the one passed in. The TimeZone
	* passed in is _not_ adopted; the client is still responsible for deleting it.
	*
	* @param zone The given time zone.
	* @stable ICU 2.0
	*/
	void setTimeZone(const TimeZone& zone);

	/**
	* Returns a reference to the time zone owned by this calendar. The returned reference
	* is only valid until clients make another call to adoptTimeZone or setTimeZone,
	* or this Calendar is destroyed.
	*
	* @return The time zone object associated with this calendar.
	* @stable ICU 2.0
	*/
	const TimeZone& getTimeZone(void) const;

	/**
	* Returns the time zone owned by this calendar. The caller owns the returned object
	* and must delete it when done. After this call, the new time zone associated
	* with this Calendar is the default TimeZone as returned by TimeZone::createDefault().
	*
	* @return The time zone object which was associated with this calendar.
	* @stable ICU 2.0
	*/
	TimeZone* orphanTimeZone(void);

	/**
	* Queries if the current date for this Calendar is in Daylight Savings Time.
	*
	* @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;

	/**
	* Specifies whether or not date/time interpretation is to be lenient. With lenient
	* interpretation, a date such as "February 942, 1996" will be treated as being
	* equivalent to the 941st day after February 1, 1996. With strict interpretation,
	* such dates will cause an error when computing time from the time field values
	* representing the dates.
	*
	* @param lenient True specifies date/time interpretation to be lenient.
	*
	* @see DateFormat#setLenient
	* @stable ICU 2.0
	*/
	void setLenient(UBool lenient);

	/**
	* Tells whether date/time interpretation is to be lenient.
	*
	* @return True tells that date/time interpretation is to be lenient.
	* @stable ICU 2.0
	*/
	UBool isLenient(void) const;

	/**
	* Sets the behavior for handling wall time repeating multiple times
	* at negative time zone offset transitions. For example, 1:30 AM on
	* November 6, 2011 in US Eastern time (America/New_York) occurs twice;
	* 1:30 AM EDT, then 1:30 AM EST one hour later. When <code>UCAL_WALLTIME_FIRST</code>
	* is used, the wall time 1:30AM in this example will be interpreted as 1:30 AM EDT
	* (first occurrence). When <code>UCAL_WALLTIME_LAST</code> is used, it will be
	* interpreted as 1:30 AM EST (last occurrence). The default value is
	* <code>UCAL_WALLTIME_LAST</code>.
	* <p>
	* <b>Note:</b>When <code>UCAL_WALLTIME_NEXT_VALID</code> is not a valid
	* option for this. When the argument is neither <code>UCAL_WALLTIME_FIRST</code>
	* nor <code>UCAL_WALLTIME_LAST</code>, this method has no effect and will keep
	* the current setting.
	*
	* @param option the behavior for handling repeating wall time, either
	* <code>UCAL_WALLTIME_FIRST</code> or <code>UCAL_WALLTIME_LAST</code>.
	* @see #getRepeatedWallTimeOption
	* @stable ICU 49
	*/
	void setRepeatedWallTimeOption(UCalendarWallTimeOption option);

	/**
	* Gets the behavior for handling wall time repeating multiple times
	* at negative time zone offset transitions.
	*
	* @return the behavior for handling repeating wall time, either
	* <code>UCAL_WALLTIME_FIRST</code> or <code>UCAL_WALLTIME_LAST</code>.
	* @see #setRepeatedWallTimeOption
	* @stable ICU 49
	*/
	UCalendarWallTimeOption getRepeatedWallTimeOption(void) const;

	/**
	* Sets the behavior for handling skipped wall time at positive time zone offset
	* transitions. For example, 2:30 AM on March 13, 2011 in US Eastern time (America/New_York)
	* does not exist because the wall time jump from 1:59 AM EST to 3:00 AM EDT. When
	* <code>UCAL_WALLTIME_FIRST</code> is used, 2:30 AM is interpreted as 30 minutes before 3:00 AM
	* EDT, therefore, it will be resolved as 1:30 AM EST. When <code>UCAL_WALLTIME_LAST</code>
	* is used, 2:30 AM is interpreted as 31 minutes after 1:59 AM EST, therefore, it will be
	* resolved as 3:30 AM EDT. When <code>UCAL_WALLTIME_NEXT_VALID</code> is used, 2:30 AM will
	* be resolved as next valid wall time, that is 3:00 AM EDT. The default value is
	* <code>UCAL_WALLTIME_LAST</code>.
	* <p>
	* <b>Note:</b>This option is effective only when this calendar is lenient.
	* When the calendar is strict, such non-existing wall time will cause an error.
	*
	* @param option the behavior for handling skipped wall time at positive time zone
	* offset transitions, one of <code>UCAL_WALLTIME_FIRST</code>, <code>UCAL_WALLTIME_LAST</code> and
	* <code>UCAL_WALLTIME_NEXT_VALID</code>.
	* @see #getSkippedWallTimeOption
	*
	* @stable ICU 49
	*/
	void setSkippedWallTimeOption(UCalendarWallTimeOption option);

	/**
	* Gets the behavior for handling skipped wall time at positive time zone offset
	* transitions.
	*
	* @return the behavior for handling skipped wall time, one of
	* <code>UCAL_WALLTIME_FIRST</code>, <code>UCAL_WALLTIME_LAST</code>
	* and <code>UCAL_WALLTIME_NEXT_VALID</code>.
	* @see #setSkippedWallTimeOption
	* @stable ICU 49
	*/
	UCalendarWallTimeOption getSkippedWallTimeOption(void) const;

	/**
	* Sets what the first day of the week is; e.g., Sunday in US, Monday in France.
	*
	* @param value The given first day of the week.
	* @stable ICU 2.6.
	*/
	void setFirstDayOfWeek(UCalendarDaysOfWeek value);

	#ifndef U_HIDE_DEPRECATED_API
	/**
	* Gets what the first day of the week is; e.g., Sunday in US, Monday in France.
	*
	* @return The first day of the week.
	* @deprecated ICU 2.6 use the overload with error code
	*/
	EDaysOfWeek getFirstDayOfWeek(void) const;
	#endif /* U_HIDE_DEPRECATED_API */

	/**
	* Gets what the first day of the week is; e.g., Sunday in US, Monday in France.
	*
	* @param status error code
	* @return The first day of the week.
	* @stable ICU 2.6
	*/
	UCalendarDaysOfWeek getFirstDayOfWeek(UErrorCode &status) const;

	/**
	* Sets what the minimal days required in the first week of the year are; For
	* example, if the first week is defined as one that contains the first day of the
	* first month of a year, call the method with value 1. If it must be a full week,
	* use value 7.
	*
	* @param value The given minimal days required in the first week of the year.
	* @stable ICU 2.0
	*/
	void setMinimalDaysInFirstWeek(uint8_t value);

	/**
	* Gets what the minimal days required in the first week of the year are; e.g., if
	* the first week is defined as one that contains the first day of the first month
	* of a year, getMinimalDaysInFirstWeek returns 1. If the minimal days required must
	* be a full week, getMinimalDaysInFirstWeek returns 7.
	*
	* @return The minimal days required in the first week of the year.
	* @stable ICU 2.0
	*/
	uint8_t getMinimalDaysInFirstWeek(void) const;

	#ifndef U_FORCE_HIDE_DEPRECATED_API
	/**
	* Gets the minimum value for the given time field. e.g., for Gregorian
	* DAY_OF_MONTH, 1.
	*
	* @param field The given time field.
	* @return The minimum value for the given time field.
	* @deprecated ICU 2.6. Use getMinimum(UCalendarDateFields field) instead.
	*/
	virtual int32_t getMinimum(EDateFields field) const;
	#endif // U_FORCE_HIDE_DEPRECATED_API

	/**
	* Gets the minimum value for the given time field. e.g., for Gregorian
	* DAY_OF_MONTH, 1.
	*
	* @param field The given time field.
	* @return The minimum value for the given time field.
	* @stable ICU 2.6.
	*/
	virtual int32_t getMinimum(UCalendarDateFields field) const;

	#ifndef U_FORCE_HIDE_DEPRECATED_API
	/**
	* Gets the maximum value for the given time field. e.g. for Gregorian DAY_OF_MONTH,
	* 31.
	*
	* @param field The given time field.
	* @return The maximum value for the given time field.
	* @deprecated ICU 2.6. Use getMaximum(UCalendarDateFields field) instead.
	*/
	virtual int32_t getMaximum(EDateFields field) const;
	#endif // U_FORCE_HIDE_DEPRECATED_API

	/**
	* Gets the maximum value for the given time field. e.g. for Gregorian DAY_OF_MONTH,
	* 31.
	*
	* @param field The given time field.
	* @return The maximum value for the given time field.
	* @stable ICU 2.6.
	*/
	virtual int32_t getMaximum(UCalendarDateFields field) const;

	#ifndef U_FORCE_HIDE_DEPRECATED_API
	/**
	* Gets the highest minimum value for the given field if varies. Otherwise same as
	* getMinimum(). For Gregorian, no difference.
	*
	* @param field The given time field.
	* @return The highest minimum value for the given time field.
	* @deprecated ICU 2.6. Use getGreatestMinimum(UCalendarDateFields field) instead.
	*/
	virtual int32_t getGreatestMinimum(EDateFields field) const;
	#endif // U_FORCE_HIDE_DEPRECATED_API

	/**
	* Gets the highest minimum value for the given field if varies. Otherwise same as
	* getMinimum(). For Gregorian, no difference.
	*
	* @param field The given time field.
	* @return The highest minimum value for the given time field.
	* @stable ICU 2.6.
	*/
	virtual int32_t getGreatestMinimum(UCalendarDateFields field) const;

	#ifndef U_FORCE_HIDE_DEPRECATED_API
	/**
	* Gets the lowest maximum value for the given field if varies. Otherwise same as
	* getMaximum(). e.g., for Gregorian DAY_OF_MONTH, 28.
	*
	* @param field The given time field.
	* @return The lowest maximum value for the given time field.
	* @deprecated ICU 2.6. Use getLeastMaximum(UCalendarDateFields field) instead.
	*/
	virtual int32_t getLeastMaximum(EDateFields field) const;
	#endif // U_FORCE_HIDE_DEPRECATED_API

	/**
	* Gets the lowest maximum value for the given field if varies. Otherwise same as
	* getMaximum(). e.g., for Gregorian DAY_OF_MONTH, 28.
	*
	* @param field The given time field.
	* @return The lowest maximum value for the given time field.
	* @stable ICU 2.6.
	*/
	virtual int32_t getLeastMaximum(UCalendarDateFields field) const;

	#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().
	*
	* The version of this function on Calendar uses an iterative algorithm to determine the
	* actual minimum value for the field. There is almost always a more efficient way to
	* accomplish this (in most cases, you can simply return getMinimum()). GregorianCalendar
	* overrides this function with a more efficient implementation.
	*
	* @param field the field to determine the minimum of
	* @param status Fill-in parameter which receives the status of this operation.
	* @return the minimum of the given field for the current date of this Calendar
	* @deprecated ICU 2.6. Use getActualMinimum(UCalendarDateFields field, UErrorCode& status) instead.
	*/
	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().
	*
	* The version of this function on Calendar uses an iterative algorithm to determine the
	* actual minimum value for the field. There is almost always a more efficient way to
	* accomplish this (in most cases, you can simply return getMinimum()). GregorianCalendar
	* overrides this function with a more efficient implementation.
	*
	* @param field the field to determine the minimum of
	* @param status Fill-in parameter which receives the status of this operation.
	* @return the minimum of the given field for the current date of this Calendar
	* @stable ICU 2.6.
	*/
	virtual 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.
	*
	* The version of this function on Calendar uses an iterative algorithm to determine the
	* actual maximum value for the field. There is almost always a more efficient way to
	* accomplish this (in most cases, you can simply return getMaximum()). GregorianCalendar
	* overrides this function with a more efficient implementation.
	*
	* @param field the field to determine the maximum of
	* @param status Fill-in parameter which receives the status of this operation.
	* @return the maximum of the given field for the current date of this Calendar
	* @stable ICU 2.6.
	*/
	virtual int32_t getActualMaximum(UCalendarDateFields field, UErrorCode& status) const;

	/**
	* Gets the value for a given time field. Recalculate the current time field values
	* if the time value has been changed by a call to setTime(). Return zero for unset
	* fields if any fields have been explicitly set by a call to set(). To force a
	* recomputation of all fields regardless of the previous state, call complete().
	* This method is semantically const, but may alter the object in memory.
	*
	* @param field The given time field.
	* @param status Fill-in parameter which receives the status of the operation.
	* @return The value for the given time field, or zero if the field is unset,
	* and set() has been called for any other field.
	* @stable ICU 2.6.
	*/
	int32_t get(UCalendarDateFields field, UErrorCode& status) const;

	/**
	* Determines if the given time field has a value set. This can affect in the
	* resolving of time in Calendar. Unset fields have a value of zero, by definition.
	*
	* @param field The given time field.
	* @return True if the given time field has a value set; false otherwise.
	* @stable ICU 2.6.
	*/
	UBool isSet(UCalendarDateFields field) const;

	/**
	* Sets the given time field with the given value.
	*
	* @param field The given time field.
	* @param value The value to be set for the given time field.
	* @stable ICU 2.6.
	*/
	void set(UCalendarDateFields field, int32_t value);

	/**
	* Sets the values for the fields YEAR, MONTH, and DATE. Other field values are
	* retained; call clear() first if this is not desired.
	*
	* @param year The value used to set the YEAR time field.
	* @param month The value used to set the MONTH time field. Month value is 0-based.
	* e.g., 0 for January.
	* @param date The value used to set the DATE time field.
	* @stable ICU 2.0
	*/
	void set(int32_t year, int32_t month, int32_t date);

	/**
	* Sets the values for the fields YEAR, MONTH, DATE, HOUR_OF_DAY, and MINUTE. Other
	* field values are retained; call clear() first if this is not desired.
	*
	* @param year The value used to set the YEAR time field.
	* @param month The value used to set the MONTH time field. Month value is
	* 0-based. E.g., 0 for January.
	* @param date The value used to set the DATE time field.
	* @param hour The value used to set the HOUR_OF_DAY time field.
	* @param minute The value used to set the MINUTE time field.
	* @stable ICU 2.0
	*/
	void set(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute);

	/**
	* Sets the values for the fields YEAR, MONTH, DATE, HOUR_OF_DAY, MINUTE, and SECOND.
	* Other field values are retained; call clear() first if this is not desired.
	*
	* @param year The value used to set the YEAR time field.
	* @param month The value used to set the MONTH time field. Month value is
	* 0-based. E.g., 0 for January.
	* @param date The value used to set the DATE time field.
	* @param hour The value used to set the HOUR_OF_DAY time field.
	* @param minute The value used to set the MINUTE time field.
	* @param second The value used to set the SECOND time field.
	* @stable ICU 2.0
	*/
	void set(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, int32_t second);

	/**
	* Clears the values of all the time fields, making them both unset and assigning
	* them a value of zero. The field values will be determined during the next
	* resolving of time into time fields.
	* @stable ICU 2.0
	*/
	void clear(void);

	/**
	* Clears the value in the given time field, both making it unset and assigning it a
	* value of zero. This field value will be determined during the next resolving of
	* time into time fields.
	*
	* @param field The time field to be cleared.
	* @stable ICU 2.6.
	*/
	void clear(UCalendarDateFields field);

	/**
	* Returns a unique class ID POLYMORPHICALLY. Pure virtual method. 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.
	* <P>
	* Concrete subclasses of Calendar must implement getDynamicClassID() and also a
	* static method and data member:
	*
	* static UClassID getStaticClassID() { return (UClassID)&fgClassID; }
	* static char fgClassID;
	*
	* @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 = 0;

	/**
	* 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".
	*
	* See type="old type name" for the calendar attribute of locale IDs
	* at http://www.unicode.org/reports/tr35/#Key_Type_Definitions
	*
	* Sample code for getting the LDML/BCP 47 calendar key value:
	* \code
	* const char *calType = cal->getType();
	* if (0 == strcmp(calType, "unknown")) {
	* // deal with unknown calendar type
	* } else {
	* string localeID("root@calendar=");
	* localeID.append(calType);
	* char langTag[100];
	* UErrorCode errorCode = U_ZERO_ERROR;
	* int32_t length = uloc_toLanguageTag(localeID.c_str(), langTag, (int32_t)sizeof(langTag), true, &errorCode);
	* if (U_FAILURE(errorCode)) {
	* // deal with errors & overflow
	* }
	* string lang(langTag, length);
	* size_t caPos = lang.find("-ca-");
	* lang.erase(0, caPos + 4);
	* // lang now contains the LDML calendar type
	* }
	* \endcode
	*
	* @return legacy calendar type name string
	* @stable ICU 49
	*/
	virtual const char * getType() const = 0;

	/**
	* Returns whether the given day of the week is a weekday, a weekend day,
	* or a day that transitions from one to the other, for the locale and
	* calendar system associated with this Calendar (the locale's region is
	* often the most determinant factor). If a transition occurs at midnight,
	* then the days before and after the transition will have the
	* type UCAL_WEEKDAY or UCAL_WEEKEND. If a transition occurs at a time
	* other than midnight, then the day of the transition will have
	* the type UCAL_WEEKEND_ONSET or UCAL_WEEKEND_CEASE. In this case, the
	* method getWeekendTransition() will return the point of
	* transition.
	* @param dayOfWeek The day of the week whose type is desired (UCAL_SUNDAY..UCAL_SATURDAY).
	* @param status The error code for the operation.
	* @return The UCalendarWeekdayType for the day of the week.
	* @stable ICU 4.4
	*/
	virtual UCalendarWeekdayType getDayOfWeekType(UCalendarDaysOfWeek dayOfWeek, UErrorCode &status) const;

	/**
	* Returns the time during the day at which the weekend begins or ends in
	* this calendar system. If getDayOfWeekType() returns UCAL_WEEKEND_ONSET
	* for the specified dayOfWeek, return the time at which the weekend begins.
	* If getDayOfWeekType() returns UCAL_WEEKEND_CEASE for the specified dayOfWeek,
	* return the time at which the weekend ends. If getDayOfWeekType() returns
	* some other UCalendarWeekdayType for the specified dayOfWeek, is it an error condition
	* (U_ILLEGAL_ARGUMENT_ERROR).
	* @param dayOfWeek The day of the week for which the weekend transition time is
	* desired (UCAL_SUNDAY..UCAL_SATURDAY).
	* @param status The error code for the operation.
	* @return The milliseconds after midnight at which the weekend begins or ends.
	* @stable ICU 4.4
	*/
	virtual int32_t getWeekendTransition(UCalendarDaysOfWeek dayOfWeek, UErrorCode &status) const;

	/**
	* Returns true if the given UDate is in the weekend in
	* this calendar system.
	* @param date The UDate in question.
	* @param status The error code for the operation.
	* @return true if the given UDate is in the weekend in
	* this calendar system, false otherwise.
	* @stable ICU 4.4
	*/
	virtual UBool isWeekend(UDate date, UErrorCode &status) const;

	/**
	* Returns true if this Calendar's current date-time is in the weekend in
	* this calendar system.
	* @return true if this Calendar's current date-time is in the weekend in
	* this calendar system, false otherwise.
	* @stable ICU 4.4
	*/
	virtual UBool isWeekend(void) const;

	#ifndef U_FORCE_HIDE_DRAFT_API
	/**
	* Returns true if the date is in a leap year. Recalculate the current time
	* field values if the time value has been changed by a call to * setTime().
	* This method is semantically const, but may alter the object in memory.
	* A "leap year" is a year that contains more days than other years (for
	* solar or lunar calendars) or more months than other years (for lunisolar
	* calendars like Hebrew or Chinese), as defined in the ECMAScript Temporal
	* proposal.
	*
	* @param status ICU Error Code
	* @return True if the date in the fields is in a Temporal proposal
	* defined leap year. False otherwise.
	* @draft ICU 73
	*/
	virtual bool inTemporalLeapYear(UErrorCode& status) const;

	/**
	* Gets The Temporal monthCode value corresponding to the month for the date.
	* The value is a string identifier that starts with the literal grapheme
	* "M" followed by two graphemes representing the zero-padded month number
	* of the current month in a normal (non-leap) year and suffixed by an
	* optional literal grapheme "L" if this is a leap month in a lunisolar
	* calendar. The 25 possible values are "M01" .. "M13" and "M01L" .. "M12L".
	* For the Hebrew calendar, the values are "M01" .. "M12" for non-leap year, and
	* "M01" .. "M05", "M05L", "M06" .. "M12" for leap year.
	* For the Chinese calendar, the values are "M01" .. "M12" for non-leap year and
	* in leap year with another monthCode in "M01L" .. "M12L".
	* For Coptic and Ethiopian calendar, the Temporal monthCode values for any
	* years are "M01" to "M13".
	*
	* @param status ICU Error Code
	* @return One of 25 possible strings in {"M01".."M13", "M01L".."M12L"}.
	* @draft ICU 73
	*/
	virtual const char* getTemporalMonthCode(UErrorCode& status) const;

	/**
	* Sets The Temporal monthCode which is a string identifier that starts
	* with the literal grapheme "M" followed by two graphemes representing
	* the zero-padded month number of the current month in a normal
	* (non-leap) year and suffixed by an optional literal grapheme "L" if this
	* is a leap month in a lunisolar calendar. The 25 possible values are
	* "M01" .. "M13" and "M01L" .. "M12L". For Hebrew calendar, the values are
	* "M01" .. "M12" for non-leap years, and "M01" .. "M05", "M05L", "M06"
	* .. "M12" for leap year.
	* For the Chinese calendar, the values are "M01" .. "M12" for non-leap year and
	* in leap year with another monthCode in "M01L" .. "M12L".
	* For Coptic and Ethiopian calendar, the Temporal monthCode values for any
	* years are "M01" to "M13".
	*
	* @param temporalMonth The value to be set for temporal monthCode.
	* @param status ICU Error Code
	*
	* @draft ICU 73
	*/
	virtual void setTemporalMonthCode(const char* temporalMonth, UErrorCode& status);

	#endif // U_FORCE_HIDE_DRAFT_API

	protected:

	/**
	* Constructs a Calendar with the default time zone as returned by
	* TimeZone::createInstance(), and the default locale.
	*
	* @param success Indicates the status of Calendar object construction. Returns
	* U_ZERO_ERROR if constructed successfully.
	* @stable ICU 2.0
	*/
	Calendar(UErrorCode& success);

	/**
	* Copy constructor
	*
	* @param source Calendar object to be copied from
	* @stable ICU 2.0
	*/
	Calendar(const Calendar& source);

	/**
	* Default assignment operator
	*
	* @param right Calendar object to be copied
	* @stable ICU 2.0
	*/
	Calendar& operator=(const Calendar& right);

	/**
	* Constructs a Calendar with the given time zone and locale. Clients are no longer
	* responsible for deleting the given time zone object after it's adopted.
	*
	* @param zone The given time zone.
	* @param aLocale The given locale.
	* @param success Indicates the status of Calendar object construction. Returns
	* U_ZERO_ERROR if constructed successfully.
	* @stable ICU 2.0
	*/
	Calendar(TimeZone* zone, const Locale& aLocale, UErrorCode& success);

	/**
	* Constructs a Calendar with the given time zone and locale.
	*
	* @param zone The given time zone.
	* @param aLocale The given locale.
	* @param success Indicates the status of Calendar object construction. Returns
	* U_ZERO_ERROR if constructed successfully.
	* @stable ICU 2.0
	*/
	Calendar(const TimeZone& zone, const Locale& aLocale, UErrorCode& success);

	/**
	* Converts Calendar's time field values to GMT as milliseconds.
	*
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @stable ICU 2.0
	*/
	virtual void computeTime(UErrorCode& status);

	/**
	* Converts GMT as milliseconds to time field values. This allows you to sync up the
	* time field values with a new time that is set for the calendar. This method
	* does NOT recompute the time first; to recompute the time, then the fields, use
	* the method complete().
	*
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @stable ICU 2.0
	*/
	virtual void computeFields(UErrorCode& status);

	/**
	* Gets this Calendar's current time as a long.
	*
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @return the current time as UTC milliseconds from the epoch.
	* @stable ICU 2.0
	*/
	double getTimeInMillis(UErrorCode& status) const;

	/**
	* Sets this Calendar's current time from the given long value.
	* @param millis the new time in UTC milliseconds from the epoch.
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @stable ICU 2.0
	*/
	void setTimeInMillis( double millis, UErrorCode& status );

	/**
	* Recomputes the current time from currently set fields, and then fills in any
	* unset fields in the time field list.
	*
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	* @stable ICU 2.0
	*/
	void complete(UErrorCode& status);

	#ifndef U_HIDE_DEPRECATED_API
	/**
	* Gets the value for a given time field. Subclasses can use this function to get
	* field values without forcing recomputation of time.
	*
	* @param field The given time field.
	* @return The value for the given time field.
	* @deprecated ICU 2.6. Use internalGet(UCalendarDateFields field) instead.
	*/
	inline int32_t internalGet(EDateFields field) const {return fFields[field];}
	#endif /* U_HIDE_DEPRECATED_API */

	#ifndef U_HIDE_INTERNAL_API
	/**
	* Gets the value for a given time field. Subclasses can use this function to get
	* field values without forcing recomputation of time. If the field's stamp is UNSET,
	* the defaultValue is used.
	*
	* @param field The given time field.
	* @param defaultValue a default value used if the field is unset.
	* @return The value for the given time field.
	* @internal
	*/
	inline int32_t internalGet(UCalendarDateFields field, int32_t defaultValue) const {return fStamp[field]>kUnset ? fFields[field] : defaultValue;}

	/**
	* Gets the value for a given time field. Subclasses can use this function to get
	* field values without forcing recomputation of time.
	*
	* @param field The given time field.
	* @return The value for the given time field.
	* @internal
	*/
	inline int32_t internalGet(UCalendarDateFields field) const {return fFields[field];}
	#endif /* U_HIDE_INTERNAL_API */

	/**
	* Use this function instead of internalGet(UCAL_MONTH). The implementation
	* check the timestamp of UCAL_MONTH and UCAL_ORDINAL_MONTH and use the
	* one set later. The subclass should override it to conver the value of UCAL_ORDINAL_MONTH
	* to UCAL_MONTH correctly if UCAL_ORDINAL_MONTH has higher priority.
	*
	* @return The value for the UCAL_MONTH.
	* @internal
	*/
	virtual int32_t internalGetMonth() const;

	/**
	* Use this function instead of internalGet(UCAL_MONTH, defaultValue). The implementation
	* check the timestamp of UCAL_MONTH and UCAL_ORDINAL_MONTH and use the
	* one set later. The subclass should override it to conver the value of UCAL_ORDINAL_MONTH
	* to UCAL_MONTH correctly if UCAL_ORDINAL_MONTH has higher priority.
	*
	* @param defaultValue a default value used if the UCAL_MONTH and
	* UCAL_ORDINAL are both unset.
	* @return The value for the UCAL_MONTH.
	* @internal
	*/
	virtual int32_t internalGetMonth(int32_t defaultValue) const;

	#ifndef U_HIDE_DEPRECATED_API
	/**
	* Sets the value for a given time field. This is a fast internal method for
	* subclasses. It does not affect the areFieldsInSync, isTimeSet, or areAllFieldsSet
	* flags.
	*
	* @param field The given time field.
	* @param value The value for the given time field.
	* @deprecated ICU 2.6. Use internalSet(UCalendarDateFields field, int32_t value) instead.
	*/
	void internalSet(EDateFields field, int32_t value);
	#endif /* U_HIDE_DEPRECATED_API */

	/**
	* Sets the value for a given time field. This is a fast internal method for
	* subclasses. It does not affect the areFieldsInSync, isTimeSet, or areAllFieldsSet
	* flags.
	*
	* @param field The given time field.
	* @param value The value for the given time field.
	* @stable ICU 2.6.
	*/
	inline void internalSet(UCalendarDateFields field, int32_t value);

	/**
	* Prepare this calendar for computing the actual minimum or maximum.
	* This method modifies this calendar's fields; it is called on a
	* temporary calendar.
	* @internal
	*/
	virtual void prepareGetActual(UCalendarDateFields field, UBool isMinimum, UErrorCode &status);

	/**
	* Limit enums. Not in sync with UCalendarLimitType (refers to internal fields).
	* @internal
	*/
	enum ELimitType {
	#ifndef U_HIDE_INTERNAL_API
	UCAL_LIMIT_MINIMUM = 0,
	UCAL_LIMIT_GREATEST_MINIMUM,
	UCAL_LIMIT_LEAST_MAXIMUM,
	UCAL_LIMIT_MAXIMUM,
	UCAL_LIMIT_COUNT
	#endif /* U_HIDE_INTERNAL_API */
	};

	/**
	* 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 = 0;

	/**
	* Return a limit for a field.
	* @param field the field, from <code>0..UCAL_MAX_FIELD</code>
	* @param limitType the type specifier for the limit
	* @see #ELimitType
	* @internal
	*/
	virtual int32_t getLimit(UCalendarDateFields field, ELimitType limitType) 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 = 0;

	/**
	* 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 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() = 0;

	/**
	* 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);

	/**
	* Subclasses must 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 Calendar implementation assumes yearWoy is in extended gregorian form
	* @return the extended year, UCAL_EXTENDED_YEAR
	* @internal
	*/
	virtual int32_t handleGetExtendedYearFromWeekFields(int32_t yearWoy, int32_t woy);

	/**
	* Validate a single field of this calendar. Subclasses should
	* override this method to validate any calendar-specific fields.
	* Generic fields can be handled by `Calendar::validateField()`.
	* @internal
	*/
	virtual void validateField(UCalendarDateFields field, UErrorCode &status);

	#ifndef U_HIDE_INTERNAL_API
	/**
	* Compute the Julian day from fields. Will determine whether to use
	* the JULIAN_DAY field directly, or other fields.
	* @return the julian day
	* @internal
	*/
	int32_t computeJulianDay();

	/**
	* Compute the milliseconds in the day from the fields. This is a
	* value from 0 to 23:59:59.999 inclusive, unless fields are out of
	* range, in which case it can be an arbitrary value. This value
	* reflects local zone wall time.
	* @internal
	*/
	double computeMillisInDay();

	/**
	* This method can assume EXTENDED_YEAR has been set.
	* @param millis milliseconds of the date fields
	* @param millisInDay milliseconds of the time fields; may be out
	* or range.
	* @param ec Output param set to failure code on function return
	* when this function fails.
	* @internal
	*/
	int32_t computeZoneOffset(double millis, double millisInDay, UErrorCode &ec);


	/**
	* Determine the best stamp in a range.
	* @param start first enum to look at
	* @param end last enum to look at
	* @param bestSoFar stamp prior to function call
	* @return the stamp value of the best stamp
	* @internal
	*/
	int32_t newestStamp(UCalendarDateFields start, UCalendarDateFields end, int32_t bestSoFar) const;

	/**
	* Marker for end of resolve set (row or group). Value for field resolution tables.
	*
	* @see #resolveFields
	* @internal
	*/
	static constexpr int32_t kResolveSTOP = -1;
	/**
	* Value to be bitwised "ORed" against resolve table field values for remapping.
	* Example: (UCAL_DATE \| kResolveRemap) in 1st column will cause 'UCAL_DATE' to be returned,
	* but will not examine the value of UCAL_DATE.
	* Value for field resolution tables.
	*
	* @see #resolveFields
	* @internal
	*/
	static constexpr int32_t kResolveRemap = 32;

	/**
	* Precedence table for Dates
	* @see #resolveFields
	* @internal
	*/
	static const UFieldResolutionTable kDatePrecedence[];

	/**
	* Precedence table for Year
	* @see #resolveFields
	* @internal
	*/
	static const UFieldResolutionTable kYearPrecedence[];

	/**
	* Precedence table for Day of Week
	* @see #resolveFields
	* @internal
	*/
	static const UFieldResolutionTable kDOWPrecedence[];

	/**
	* Precedence table for Months
	* @see #resolveFields
	* @internal
	*/
	static const UFieldResolutionTable kMonthPrecedence[];

	/**
	* Given a precedence table, return the newest field combination in
	* the table, or UCAL_FIELD_COUNT if none is found.
	*
	* <p>The precedence table is a 3-dimensional array of integers. It
	* may be thought of as an array of groups. Each group is an array of
	* lines. Each line is an array of field numbers. Within a line, if
	* all fields are set, then the time stamp of the line is taken to be
	* the stamp of the most recently set field. If any field of a line is
	* unset, then the line fails to match. Within a group, the line with
	* the newest time stamp is selected. The first field of the line is
	* returned to indicate which line matched.
	*
	* <p>In some cases, it may be desirable to map a line to field that
	* whose stamp is NOT examined. For example, if the best field is
	* DAY_OF_WEEK then the DAY_OF_WEEK_IN_MONTH algorithm may be used. In
	* order to do this, insert the value <code>kResolveRemap \| F</code> at
	* the start of the line, where <code>F</code> is the desired return
	* field value. This field will NOT be examined; it only determines
	* the return value if the other fields in the line are the newest.
	*
	* <p>If all lines of a group contain at least one unset field, then no
	* line will match, and the group as a whole will fail to match. In
	* that case, the next group will be processed. If all groups fail to
	* match, then UCAL_FIELD_COUNT is returned.
	* @internal
	*/
	UCalendarDateFields resolveFields(const UFieldResolutionTable *precedenceTable) const;
	#endif /* U_HIDE_INTERNAL_API */


	/**
	* @internal
	*/
	virtual const UFieldResolutionTable* getFieldResolutionTable() const;

	#ifndef U_HIDE_INTERNAL_API
	/**
	* Return the field that is newer, either defaultField, or
	* alternateField. If neither is newer or neither is set, return defaultField.
	* @internal
	*/
	UCalendarDateFields newerField(UCalendarDateFields defaultField, UCalendarDateFields alternateField) const;
	#endif /* U_HIDE_INTERNAL_API */


	private:
	/**
	* Helper function for calculating limits by trial and error
	* @param field The field being investigated
	* @param startValue starting (least max) value of field
	* @param endValue ending (greatest max) value of field
	* @param status return type
	* @internal (private)
	*/
	int32_t getActualHelper(UCalendarDateFields field, int32_t startValue, int32_t endValue, UErrorCode &status) const;


	protected:
	/**
	* The flag which indicates if the current time is set in the calendar.
	* @stable ICU 2.0
	*/
	UBool fIsTimeSet;

	/**
	* True if the fields are in sync with the currently set time of this Calendar.
	* If false, then the next attempt to get the value of a field will
	* force a recomputation of all fields from the current value of the time
	* field.
	* <P>
	* This should really be named areFieldsInSync, but the old name is retained
	* for backward compatibility.
	* @stable ICU 2.0
	*/
	UBool fAreFieldsSet;

	/**
	* True if all of the fields have been set. This is initially false, and set to
	* true by computeFields().
	* @stable ICU 2.0
	*/
	UBool fAreAllFieldsSet;

	/**
	* True if all fields have been virtually set, but have not yet been
	* computed. This occurs only in setTimeInMillis(). A calendar set
	* to this state will compute all fields from the time if it becomes
	* necessary, but otherwise will delay such computation.
	* @stable ICU 3.0
	*/
	UBool fAreFieldsVirtuallySet;

	/**
	* Get the current time without recomputing.
	*
	* @return the current time without recomputing.
	* @stable ICU 2.0
	*/
	UDate internalGetTime(void) const { return fTime; }

	/**
	* Set the current time without affecting flags or fields.
	*
	* @param time The time to be set
	* @return the current time without recomputing.
	* @stable ICU 2.0
	*/
	void internalSetTime(UDate time) { fTime = time; }

	/**
	* The time fields containing values into which the millis is computed.
	* @stable ICU 2.0
	*/
	int32_t fFields[UCAL_FIELD_COUNT];

	#ifndef U_FORCE_HIDE_DEPRECATED_API
	/**
	* The flags which tell if a specified time field for the calendar is set.
	* @deprecated ICU 2.8 use (fStamp[n]!=kUnset)
	*/
	UBool fIsSet[UCAL_FIELD_COUNT];
	#endif // U_FORCE_HIDE_DEPRECATED_API

	/** Special values of stamp[]
	* @stable ICU 2.0
	*/
	enum {
	kUnset = 0,
	kInternallySet,
	kMinimumUserStamp
	};

	/**
	* Pseudo-time-stamps which specify when each field was set. There
	* are two special values, UNSET and INTERNALLY_SET. Values from
	* MINIMUM_USER_SET to Integer.MAX_VALUE are legal user set values.
	* @stable ICU 2.0
	*/
	int32_t fStamp[UCAL_FIELD_COUNT];

	/**
	* 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>
	*
	* Subclasses can refer to the DAY_OF_WEEK and DOW_LOCAL fields, which
	* will be set when this method is called. Subclasses can also call
	* the getGregorianXxx() methods to obtain Gregorian calendar
	* equivalents for the given Julian day.
	*
	* <p>In addition, subclasses should compute any subclass-specific
	* fields, that is, fields from BASE_FIELD_COUNT to
	* getFieldCount() - 1.
	*
	* <p>The default implementation in <code>Calendar</code> implements
	* a pure proleptic Gregorian calendar.
	* @internal
	*/
	virtual void handleComputeFields(int32_t julianDay, UErrorCode &status);

	#ifndef U_HIDE_INTERNAL_API
	/**
	* Return the extended year on the Gregorian calendar as computed by
	* <code>computeGregorianFields()</code>.
	* @internal
	*/
	int32_t getGregorianYear() const {
	return fGregorianYear;
	}

	/**
	* Return the month (0-based) on the Gregorian calendar as computed by
	* <code>computeGregorianFields()</code>.
	* @internal
	*/
	int32_t getGregorianMonth() const {
	return fGregorianMonth;
	}

	/**
	* Return the day of year (1-based) on the Gregorian calendar as
	* computed by <code>computeGregorianFields()</code>.
	* @internal
	*/
	int32_t getGregorianDayOfYear() const {
	return fGregorianDayOfYear;
	}

	/**
	* Return the day of month (1-based) on the Gregorian calendar as
	* computed by <code>computeGregorianFields()</code>.
	* @internal
	*/
	int32_t getGregorianDayOfMonth() const {
	return fGregorianDayOfMonth;
	}
	#endif /* U_HIDE_INTERNAL_API */

	/**
	* Called by computeJulianDay. Returns the default month (0-based) for the year,
	* taking year and era into account. Defaults to 0 for Gregorian, which doesn't care.
	* @param eyear The extended year
	* @internal
	*/
	virtual int32_t getDefaultMonthInYear(int32_t eyear) ;


	/**
	* Called by computeJulianDay. Returns the default day (1-based) for the month,
	* taking currently-set year and era into account. Defaults to 1 for Gregorian.
	* @param eyear the extended year
	* @param month the month in the year
	* @internal
	*/
	virtual int32_t getDefaultDayInMonth(int32_t eyear, int32_t month);

	//-------------------------------------------------------------------------
	// Protected utility methods for use by subclasses. These are very handy
	// for implementing add, roll, and computeFields.
	//-------------------------------------------------------------------------

	/**
	* Adjust the specified field so that it is within
	* the allowable range for the date to which this calendar is set.
	* For example, in a Gregorian calendar pinning the {@link #UCalendarDateFields DAY_OF_MONTH}
	* field for a calendar set to April 31 would cause it to be set
	* to April 30.
	* <p>
	* <b>Subclassing:</b>
	* <br>
	* This utility method is intended for use by subclasses that need to implement
	* their own overrides of {@link #roll roll} and {@link #add add}.
	* <p>
	* <b>Note:</b>
	* <code>pinField</code> is implemented in terms of
	* {@link #getActualMinimum getActualMinimum}
	* and {@link #getActualMaximum getActualMaximum}. If either of those methods uses
	* a slow, iterative algorithm for a particular field, it would be
	* unwise to attempt to call <code>pinField</code> for that field. If you
	* really do need to do so, you should override this method to do
	* something more efficient for that field.
	* <p>
	* @param field The calendar field whose value should be pinned.
	* @param status Output param set to failure code on function return
	* when this function fails.
	*
	* @see #getActualMinimum
	* @see #getActualMaximum
	* @stable ICU 2.0
	*/
	virtual void pinField(UCalendarDateFields field, UErrorCode& status);

	/**
	* Return the week number of a day, within a period. This may be the week number in
	* a year or the week number in a month. Usually this will be a value >= 1, but if
	* some initial days of the period are excluded from week 1, because
	* {@link #getMinimalDaysInFirstWeek getMinimalDaysInFirstWeek} is > 1, then
	* the week number will be zero for those
	* initial days. This method requires the day number and day of week for some
	* known date in the period in order to determine the day of week
	* on the desired day.
	* <p>
	* <b>Subclassing:</b>
	* <br>
	* This method is intended for use by subclasses in implementing their
	* {@link #computeTime computeTime} and/or {@link #computeFields computeFields} methods.
	* It is often useful in {@link #getActualMinimum getActualMinimum} and
	* {@link #getActualMaximum getActualMaximum} as well.
	* <p>
	* This variant is handy for computing the week number of some other
	* day of a period (often the first or last day of the period) when its day
	* of the week is not known but the day number and day of week for some other
	* day in the period (e.g. the current date) <em>is</em> known.
	* <p>
	* @param desiredDay The {@link #UCalendarDateFields DAY_OF_YEAR} or
	* {@link #UCalendarDateFields DAY_OF_MONTH} whose week number is desired.
	* Should be 1 for the first day of the period.
	*
	* @param dayOfPeriod The {@link #UCalendarDateFields DAY_OF_YEAR}
	* or {@link #UCalendarDateFields DAY_OF_MONTH} for a day in the period whose
	* {@link #UCalendarDateFields DAY_OF_WEEK} is specified by the
	* <code>knownDayOfWeek</code> parameter.
	* Should be 1 for first day of period.
	*
	* @param dayOfWeek The {@link #UCalendarDateFields DAY_OF_WEEK} for the day
	* corresponding to the <code>knownDayOfPeriod</code> parameter.
	* 1-based with 1=Sunday.
	*
	* @return The week number (one-based), or zero if the day falls before
	* the first week because
	* {@link #getMinimalDaysInFirstWeek getMinimalDaysInFirstWeek}
	* is more than one.
	*
	* @stable ICU 2.8
	*/
	int32_t weekNumber(int32_t desiredDay, int32_t dayOfPeriod, int32_t dayOfWeek);


	#ifndef U_HIDE_INTERNAL_API
	/**
	* Return the week number of a day, within a period. This may be the week number in
	* a year, or the week number in a month. Usually this will be a value >= 1, but if
	* some initial days of the period are excluded from week 1, because
	* {@link #getMinimalDaysInFirstWeek getMinimalDaysInFirstWeek} is > 1,
	* then the week number will be zero for those
	* initial days. This method requires the day of week for the given date in order to
	* determine the result.
	* <p>
	* <b>Subclassing:</b>
	* <br>
	* This method is intended for use by subclasses in implementing their
	* {@link #computeTime computeTime} and/or {@link #computeFields computeFields} methods.
	* It is often useful in {@link #getActualMinimum getActualMinimum} and
	* {@link #getActualMaximum getActualMaximum} as well.
	* <p>
	* @param dayOfPeriod The {@link #UCalendarDateFields DAY_OF_YEAR} or
	* {@link #UCalendarDateFields DAY_OF_MONTH} whose week number is desired.
	* Should be 1 for the first day of the period.
	*
	* @param dayOfWeek The {@link #UCalendarDateFields DAY_OF_WEEK} for the day
	* corresponding to the <code>dayOfPeriod</code> parameter.
	* 1-based with 1=Sunday.
	*
	* @return The week number (one-based), or zero if the day falls before
	* the first week because
	* {@link #getMinimalDaysInFirstWeek getMinimalDaysInFirstWeek}
	* is more than one.
	* @internal
	*/
	inline int32_t weekNumber(int32_t dayOfPeriod, int32_t dayOfWeek);

	/**
	* returns the local DOW, valid range 0..6
	* @internal
	*/
	int32_t getLocalDOW();
	#endif /* U_HIDE_INTERNAL_API */

	private:

	/**
	* The next available value for fStamp[]
	*/
	int32_t fNextStamp;// = MINIMUM_USER_STAMP;

	/**
	* Recalculates the time stamp array (fStamp).
	* Resets fNextStamp to lowest next stamp value.
	*/
	void recalculateStamp();

	/**
	* The current time set for the calendar.
	*/
	UDate fTime;

	/**
	* @see #setLenient
	*/
	UBool fLenient;

	/**
	* Time zone affects the time calculation done by Calendar. Calendar subclasses use
	* the time zone data to produce the local time. Always set; never nullptr.
	*/
	TimeZone* fZone;

	/**
	* Option for repeated wall time
	* @see #setRepeatedWallTimeOption
	*/
	UCalendarWallTimeOption fRepeatedWallTime;

	/**
	* Option for skipped wall time
	* @see #setSkippedWallTimeOption
	*/
	UCalendarWallTimeOption fSkippedWallTime;

	/**
	* Both firstDayOfWeek and minimalDaysInFirstWeek are locale-dependent. They are
	* used to figure out the week count for a specific date for a given locale. These
	* must be set when a Calendar is constructed. For example, in US locale,
	* firstDayOfWeek is SUNDAY; minimalDaysInFirstWeek is 1. They are used to figure
	* out the week count for a specific date for a given locale. These must be set when
	* a Calendar is constructed.
	*/
	UCalendarDaysOfWeek fFirstDayOfWeek;
	uint8_t fMinimalDaysInFirstWeek;
	UCalendarDaysOfWeek fWeekendOnset;
	int32_t fWeekendOnsetMillis;
	UCalendarDaysOfWeek fWeekendCease;
	int32_t fWeekendCeaseMillis;

	/**
	* Sets firstDayOfWeek and minimalDaysInFirstWeek. Called at Calendar construction
	* time.
	*
	* @param desiredLocale The given locale.
	* @param type The calendar type identifier, e.g: gregorian, buddhist, etc.
	* @param success Indicates the status of setting the week count data from
	* the resource for the given locale. Returns U_ZERO_ERROR if
	* constructed successfully.
	*/
	void setWeekData(const Locale& desiredLocale, const char *type, UErrorCode& success);

	/**
	* Recompute the time and update the status fields isTimeSet
	* and areFieldsSet. Callers should check isTimeSet and only
	* call this method if isTimeSet is false.
	*
	* @param status Output param set to success/failure code on exit. If any value
	* previously set in the time field is invalid or restricted by
	* leniency, this will be set to an error status.
	*/
	void updateTime(UErrorCode& status);

	/**
	* The Gregorian year, as computed by computeGregorianFields() and
	* returned by getGregorianYear().
	* @see #computeGregorianFields
	*/
	int32_t fGregorianYear;

	/**
	* The Gregorian month, as computed by computeGregorianFields() and
	* returned by getGregorianMonth().
	* @see #computeGregorianFields
	*/
	int32_t fGregorianMonth;

	/**
	* The Gregorian day of the year, as computed by
	* computeGregorianFields() and returned by getGregorianDayOfYear().
	* @see #computeGregorianFields
	*/
	int32_t fGregorianDayOfYear;

	/**
	* The Gregorian day of the month, as computed by
	* computeGregorianFields() and returned by getGregorianDayOfMonth().
	* @see #computeGregorianFields
	*/
	int32_t fGregorianDayOfMonth;

	/* calculations */

	/**
	* Compute the Gregorian calendar year, month, and day of month from
	* the given Julian day. These values are not stored in fields, but in
	* member variables gregorianXxx. Also compute the DAY_OF_WEEK and
	* DOW_LOCAL fields.
	*/
	void computeGregorianAndDOWFields(int32_t julianDay, UErrorCode &ec);

	protected:

	/**
	* Compute the Gregorian calendar year, month, and day of month from the
	* Julian day. These values are not stored in fields, but in member
	* variables gregorianXxx. They are used for time zone computations and by
	* subclasses that are Gregorian derivatives. Subclasses may call this
	* method to perform a Gregorian calendar millis->fields computation.
	*/
	void computeGregorianFields(int32_t julianDay, UErrorCode &ec);

	private:

	/**
	* Compute the fields WEEK_OF_YEAR, YEAR_WOY, WEEK_OF_MONTH,
	* DAY_OF_WEEK_IN_MONTH, and DOW_LOCAL from EXTENDED_YEAR, YEAR,
	* DAY_OF_WEEK, and DAY_OF_YEAR. The latter fields are computed by the
	* subclass based on the calendar system.
	*
	* <p>The YEAR_WOY field is computed simplistically. It is equal to YEAR
	* most of the time, but at the year boundary it may be adjusted to YEAR-1
	* or YEAR+1 to reflect the overlap of a week into an adjacent year. In
	* this case, a simple increment or decrement is performed on YEAR, even
	* though this may yield an invalid YEAR value. For instance, if the YEAR
	* is part of a calendar system with an N-year cycle field CYCLE, then
	* incrementing the YEAR may involve incrementing CYCLE and setting YEAR
	* back to 0 or 1. This is not handled by this code, and in fact cannot be
	* simply handled without having subclasses define an entire parallel set of
	* fields for fields larger than or equal to a year. This additional
	* complexity is not warranted, since the intention of the YEAR_WOY field is
	* to support ISO 8601 notation, so it will typically be used with a
	* proleptic Gregorian calendar, which has no field larger than a year.
	*/
	void computeWeekFields(UErrorCode &ec);


	/**
	* Ensure that each field is within its valid range by calling {@link
	* #validateField(int, int&)} on each field that has been set. This method
	* should only be called if this calendar is not lenient.
	* @see #isLenient
	* @see #validateField(int, int&)
	*/
	void validateFields(UErrorCode &status);

	/**
	* Validate a single field of this calendar given its minimum and
	* maximum allowed value. If the field is out of range,
	* <code>U_ILLEGAL_ARGUMENT_ERROR</code> will be set. Subclasses may
	* use this method in their implementation of {@link
	* #validateField(int, int&)}.
	*/
	void validateField(UCalendarDateFields field, int32_t min, int32_t max, UErrorCode& status);

	protected:
	#ifndef U_HIDE_INTERNAL_API
	/**
	* Convert a quasi Julian date to the day of the week. The Julian date used here is
	* not a true Julian date, since it is measured from midnight, not noon. Return
	* value is one-based.
	*
	* @param julian The given Julian date number.
	* @return Day number from 1..7 (SUN..SAT).
	* @internal
	*/
	static uint8_t julianDayToDayOfWeek(double julian);
	#endif /* U_HIDE_INTERNAL_API */

	private:
	char validLocale[ULOC_FULLNAME_CAPACITY];
	char actualLocale[ULOC_FULLNAME_CAPACITY];

	public:
	#if !UCONFIG_NO_SERVICE
	/**
	* INTERNAL FOR 2.6 -- Registration.
	*/

	#ifndef U_HIDE_INTERNAL_API
	/**
	* Return a StringEnumeration over the locales available at the time of the call,
	* including registered locales.
	* @return a StringEnumeration over the locales available at the time of the call
	* @internal
	*/
	static StringEnumeration* getAvailableLocales(void);

	/**
	* Register a new Calendar factory. The factory will be adopted.
	* INTERNAL in 2.6
	*
	* Because ICU may choose to cache Calendars internally, this must
	* be called at application startup, prior to any calls to
	* Calendar::createInstance to avoid undefined behavior.
	*
	* @param toAdopt the factory instance to be adopted
	* @param status the in/out status code, no special meanings are assigned
	* @return a registry key that can be used to unregister this factory
	* @internal
	*/
	static URegistryKey registerFactory(ICUServiceFactory* toAdopt, UErrorCode& status);

	/**
	* Unregister a previously-registered CalendarFactory using the key returned from the
	* register call. Key becomes invalid after a successful call and should not be used again.
	* The CalendarFactory corresponding to the key will be deleted.
	* INTERNAL in 2.6
	*
	* Because ICU may choose to cache Calendars internally, this should
	* be called during application shutdown, after all calls to
	* Calendar::createInstance to avoid undefined behavior.
	*
	* @param key the registry key returned by a previous call to registerFactory
	* @param status the in/out status code, no special meanings are assigned
	* @return true if the factory for the key was successfully unregistered
	* @internal
	*/
	static UBool unregister(URegistryKey key, UErrorCode& status);
	#endif /* U_HIDE_INTERNAL_API */

	/**
	* Multiple Calendar Implementation
	* @internal
	*/
	friend class CalendarFactory;

	/**
	* Multiple Calendar Implementation
	* @internal
	*/
	friend class CalendarService;

	/**
	* Multiple Calendar Implementation
	* @internal
	*/
	friend class DefaultCalendarFactory;
	#endif /* !UCONFIG_NO_SERVICE */

	/**
	* @return true if this calendar has a default century (i.e. 03 -> 2003)
	* @internal
	*/
	virtual UBool haveDefaultCentury() const = 0;

	/**
	* @return the start of the default century, as a UDate
	* @internal
	*/
	virtual UDate defaultCenturyStart() const = 0;
	/**
	* @return the beginning year of the default century, as a year
	* @internal
	*/
	virtual int32_t defaultCenturyStartYear() const = 0;

	/** Get the locale for this calendar object. You can choose between valid and actual locale.
	* @param type type of the locale we're looking for (valid or actual)
	* @param status error code for the operation
	* @return the locale
	* @stable ICU 2.8
	*/
	Locale getLocale(ULocDataLocaleType type, UErrorCode &status) const;

	/**
	* @return The related Gregorian year; will be obtained by modifying the value
	* obtained by get from UCAL_EXTENDED_YEAR field
	* @internal
	*/
	virtual int32_t getRelatedYear(UErrorCode &status) const;

	/**
	* @param year The related Gregorian year to set; will be modified as necessary then
	* set in UCAL_EXTENDED_YEAR field
	* @internal
	*/
	virtual void setRelatedYear(int32_t year);

	#ifndef U_HIDE_INTERNAL_API
	/** Get the locale for this calendar object. You can choose between valid and actual locale.
	* @param type type of the locale we're looking for (valid or actual)
	* @param status error code for the operation
	* @return the locale
	* @internal
	*/
	const char* getLocaleID(ULocDataLocaleType type, UErrorCode &status) const;
	#endif /* U_HIDE_INTERNAL_API */

	private:
	/**
	* Cast TimeZone used by this object to BasicTimeZone, or nullptr if the TimeZone
	* is not an instance of BasicTimeZone.
	*/
	BasicTimeZone* getBasicTimeZone() const;

	/**
	* Find the previous zone transition near the given time.
	* @param base The base time, inclusive
	* @param transitionTime Receives the result time
	* @param status The error status
	* @return true if a transition is found.
	*/
	UBool getImmediatePreviousZoneTransition(UDate base, UDate *transitionTime, UErrorCode& status) const;

	public:
	#ifndef U_HIDE_INTERNAL_API
	/**
	* Creates a new Calendar from a Locale for the cache.
	* This method does not set the time or timezone in returned calendar.
	* @param locale the locale.
	* @param status any error returned here.
	* @return the new Calendar object with no time or timezone set.
	* @internal For ICU use only.
	*/
	static Calendar * U_EXPORT2 makeInstance(
	const Locale &locale, UErrorCode &status);

	/**
	* Get the calendar type for given locale.
	* @param locale the locale
	* @param typeBuffer calendar type returned here
	* @param typeBufferSize The size of typeBuffer in bytes. If the type
	* can't fit in the buffer, this method sets status to
	* U_BUFFER_OVERFLOW_ERROR
	* @param status error, if any, returned here.
	* @internal For ICU use only.
	*/
	static void U_EXPORT2 getCalendarTypeFromLocale(
	const Locale &locale,
	char *typeBuffer,
	int32_t typeBufferSize,
	UErrorCode &status);
	#endif /* U_HIDE_INTERNAL_API */
	};

	// -------------------------------------

	inline Calendar*
	Calendar::createInstance(TimeZone* zone, UErrorCode& errorCode)
	{
	// since the Locale isn't specified, use the default locale
	return createInstance(zone, Locale::getDefault(), errorCode);
	}

	// -------------------------------------

	inline void
	Calendar::roll(UCalendarDateFields field, UBool up, UErrorCode& status)
	{
	roll(field, (int32_t)(up ? +1 : -1), status);
	}

	#ifndef U_HIDE_DEPRECATED_API
	inline void
	Calendar::roll(EDateFields field, UBool up, UErrorCode& status)
	{
	roll((UCalendarDateFields) field, up, status);
	}
	#endif /* U_HIDE_DEPRECATED_API */


	// -------------------------------------

	/**
	* Fast method for subclasses. The caller must maintain fUserSetDSTOffset and
	* fUserSetZoneOffset, as well as the isSet[] array.
	*/

	inline void
	Calendar::internalSet(UCalendarDateFields field, int32_t value)
	{
	fFields[field] = value;
	fStamp[field] = kInternallySet;
	fIsSet[field] = true; // Remove later
	}


	#ifndef U_HIDE_INTERNAL_API
	inline int32_t Calendar::weekNumber(int32_t dayOfPeriod, int32_t dayOfWeek)
	{
	return weekNumber(dayOfPeriod, dayOfPeriod, dayOfWeek);
	}
	#endif /* U_HIDE_INTERNAL_API */

	U_NAMESPACE_END

	#endif /* #if !UCONFIG_NO_FORMATTING */

	#endif /* U_SHOW_CPLUSPLUS_API */

	#endif // _CALENDAR