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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: -12*U_MILLIS_PER_HOUR..12*U_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();
 
     /**
      * 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() 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();
 
     /**
      * 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() 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() 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() 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() 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() 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();
 
     /**
      * 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. Clearing UCAL_ORDINAL_MONTH or UCAL_MONTH will
      * clear both 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)&amp;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() 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() const;
 
     /**
      * 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.
      * @stable 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"}.
      * @stable 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
      *
      * @stable ICU 73
      */
     virtual void setTemporalMonthCode(const char* temporalMonth, UErrorCode& status);
 
 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];}
 
     /**
      * The year in this calendar is counting from 1 backward if the era is 0.
      * @return The year in era 0 of this calendar is counting backward from 1.
      * @internal
      */
     virtual bool isEra0CountingBackward() const { return false; }
 #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(UErrorCode& status) 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.
      * @param status Output param set to failure code on function return
      *          when this function fails.
      * @return       The value for the UCAL_MONTH.
      * @internal
      */
     virtual int32_t internalGetMonth(int32_t defaultValue, UErrorCode& status) 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
      * @param status Output param set to failure code on function return
      *          when this function fails.
      * @return the Julian day number of the day before the first
      * day of the given month and year
      * @internal
      */
     virtual int64_t handleComputeMonthStart(int32_t eyear, int32_t month,
                                             UBool useMonth, UErrorCode& status) const  = 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, UErrorCode& status) 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.
      * @param status        ICU Error Code
      * @return the extended year
      * @internal
      */
     virtual int32_t handleGetExtendedYear(UErrorCode& status) = 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
      * @param status        ICU Error Code
      * @return julian day specified by calendar fields.
      * @internal
      */
     virtual int32_t handleComputeJulianDay(UCalendarDateFields bestField, UErrorCode &status);
 
     /**
      * 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, UErrorCode& status);
 
     /**
      * 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.
      * @param status        ICU Error Code
      * @return the julian day
      * @internal
      */
     int32_t computeJulianDay(UErrorCode &status);
 
     /**
      * 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() 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
      * @param status Output param set to failure code on function return
      *          when this function fails.
      * @internal
      */
     virtual int32_t getDefaultMonthInYear(int32_t eyear, UErrorCode& status);
 
 
     /**
      * 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
      * @param status Output param set to failure code on function return
      *          when this function fails.
      * @internal
      */
     virtual int32_t getDefaultDayInMonth(int32_t eyear, int32_t month, UErrorCode& status);
 
     //-------------------------------------------------------------------------
     // 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(UErrorCode& status);
 #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(int32_t 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();
 
     /**
      * 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, static_cast<int32_t>(up ? +1 : -1), status);
 }
 
 #ifndef U_HIDE_DEPRECATED_API
 inline void
 Calendar::roll(EDateFields field, UBool up, UErrorCode& status)
 {
     roll(static_cast<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
 }
 
 /**
  * Macro for the class to declare it override
  * haveDefaultCentury, defaultCenturyStart, and
  * defaultCenturyStartYear functions in this class.
  * @internal
  */
 #define DECLARE_OVERRIDE_SYSTEM_DEFAULT_CENTURY \
     virtual UBool haveDefaultCentury() const override; \
     virtual UDate defaultCenturyStart() const override; \
     virtual int32_t defaultCenturyStartYear() const override;
 
 #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

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