The Tor Browser: comparison intl/icu/source/i18n/unicode/calendar.h

--1:000000000000
+:a8a879c62302
+/*
+********************************************************************************
+*   Copyright (C) 1997-2013, 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"
+/**
+* \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;
+/**
+* @internal
+*/
+typedef int32_t UFieldResolutionTable[12][8];
+class BasicTimeZone;
+/**
+* <code>Calendar</code> is an abstract base class for converting between
+* a <code>UDate</code> object and a set of integer fields such as
+* <code>YEAR</code>, <code>MONTH</code>, <code>DAY</code>, <code>HOUR</code>,
+* and so on. (A <code>UDate</code> object represents a specific instant in
+* time with millisecond precision. See UDate
+* for information about the <code>UDate</code> class.)
+*
+* <p>
+* Subclasses of <code>Calendar</code> interpret a <code>UDate</code>
+* according to the rules of a specific calendar system.
+* The most commonly used subclass of <code>Calendar</code> is
+* <code>GregorianCalendar</code>. Other subclasses could represent
+* the various types of lunar calendars in use in many parts of the world.
+*
+* <p>
+* <b>NOTE</b>: (ICU 2.6) The subclass interface should be considered unstable
+* - it WILL change.
+*
+* <p>
+* Like other locale-sensitive classes, <code>Calendar</code> provides a
+* static method, <code>createInstance</code>, for getting a generally useful
+* object of this type. <code>Calendar</code>'s <code>createInstance</code> method
+* returns the appropriate <code>Calendar</code> subclass whose
+* time fields have been initialized with the current date and time:
+* \htmlonly<blockquote>\endhtmlonly
+* <pre>
+* Calendar *rightNow = Calendar::createInstance(errCode);
+* </pre>
+* \htmlonly</blockquote>\endhtmlonly
+*
+* <p>
+* A <code>Calendar</code> 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).
+*
+* <p>
+* When computing a <code>UDate</code> from time fields, some special circumstances
+* may arise: there may be insufficient information to compute the
+* <code>UDate</code> (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.
+*
+* <p>
+* <strong>Insufficient information.</strong> 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.
+*
+* <p>
+* <strong>Inconsistent information.</strong> 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.
+*
+* \htmlonly<blockquote>\endhtmlonly
+* <pre>
+* 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
+* </pre>
+* \htmlonly</blockquote>\endhtmlonly
+*
+* For the time of day:
+*
+* \htmlonly<blockquote>\endhtmlonly
+* <pre>
+* HOUR_OF_DAY
+* AM_PM + HOUR
+* </pre>
+* \htmlonly</blockquote>\endhtmlonly
+*
+* <p>
+* <strong>Ambiguous Wall Clock Time.</strong> When time offset from UTC has
+* changed, it produces 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 1:00 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.
+*
+* <p>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.
+*
+* <p>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.
+*
+* <p>
+* <strong>Note:</strong> for some non-Gregorian calendars, different
+* fields may be necessary for complete disambiguation. For example, a full
+* specification of the historial Arabic astronomical calendar requires year,
+* month, day-of-month <em>and</em> day-of-week in some cases.
+*
+* <p>
+* <strong>Note:</strong> There are certain possible ambiguities in
+* interpretation of certain singular times, which are resolved in the
+* following ways:
+* <ol>
+*     <li> 24:00:00 "belongs" to the following day. That is,
+*          23:59 on Dec 31, 1969 &lt; 24:00 on Jan 1, 1970 &lt; 24:01:00 on Jan 1, 1970
+*
+*     <li> Although historically not precise, midnight also belongs to "am",
+*          and noon belongs to "pm", so on the same day,
+*          12:00 am (midnight) &lt; 12:01 am, and 12:00 pm (noon) &lt; 12:01 pm
+* </ol>
+*
+* <p>
+* 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 {@link DateFormat}
+* to format dates.
+*
+* <p>
+* <code>Calendar</code> 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 <code>December 12, <b>1996</b></code> results in
+* <code>January 12, <b>1996</b></code>.
+*
+* <p>
+* <code>Calendar</code> 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 <code>September 12, 1996</code>
+* results in <code>September 7, 1996</code>.
+*
+* <p><big><b>Supported range</b></big>
+*
+* <p>The allowable range of <code>Calendar</code> has been
+* narrowed. <code>GregorianCalendar</code> used to attempt to support
+* the range of dates with millisecond values from
+* <code>Long.MIN_VALUE</code> to <code>Long.MAX_VALUE</code>.
+* The new <code>Calendar</code> protocol specifies the
+* maximum range of supportable dates as those having Julian day numbers
+* of <code>-0x7F000000</code> to <code>+0x7F000000</code>. This
+* corresponds to years from ~5,800,000 BCE to ~5,800,000 CE. Programmers
+* should use the protected constants in <code>Calendar</code> to
+* specify an extremely early or extremely late date.</p>
+*
+* @stable ICU 2.0
+*/
+class U_I18N_API Calendar : public UObject {
+public:
+/**
+* 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 */
+};
+#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(void) 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. NULL 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. NULL 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. NULL 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. NULL 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. NULL 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. NULL otherwise.
+* @stable ICU 2.0
+*/
+static Calendar* U_EXPORT2 createInstance(const TimeZone& zone, const Locale& aLocale, UErrorCode& success);
+/**
+* Returns a list of the locales for which Calendars are installed.
+*
+* @param count  Number of locales returned.
+* @return       An array of Locale objects representing the set of locales for which
+*               Calendars are installed.  The system retains ownership of this list;
+*               the caller must NOT delete it. Does not include user-registered Calendars.
+* @stable ICU 2.0
+*/
+static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count);
+/**
+* Given a key and a locale, returns an array of string values in a preferred
+* order that would make a difference. These are all and only those values where
+* the open (creation) of the service with the locale formed from the input locale
+* plus input keyword and that value has different behavior than creation with the
+* input locale alone.
+* @param key           one of the keys supported by this service.  For now, only
+*                      "calendar" is supported.
+* @param locale        the locale
+* @param commonlyUsed  if set to true it will return only commonly used values
+*                      with the given locale in preferred order.  Otherwise,
+*                      it will return all the available values for the locale.
+* @param status        ICU Error Code
+* @return a string enumeration over keyword values for the given key and the locale.
+* @stable ICU 4.2
+*/
+static StringEnumeration* U_EXPORT2 getKeywordValuesForLocale(const char* key,
+const Locale& locale, UBool commonlyUsed, UErrorCode& status);
+/**
+* Returns the current UTC (GMT) time measured in milliseconds since 0:00:00 on 1/1/70
+* (derived from the system time).
+*
+* @return   The current UTC time in milliseconds.
+* @stable ICU 2.0
+*/
+static UDate U_EXPORT2 getNow(void);
+/**
+* Gets this Calendar's time as milliseconds. May involve recalculation of time due
+* to previous calls to set time field values. The time specified is non-local UTC
+* (GMT) time. Although this method is const, this object may actually be changed
+* (semantically const).
+*
+* @param status  Output param set to success/failure code on exit. If any value
+*                previously set in the time field is invalid or restricted by
+*                leniency, this will be set to an error status.
+* @return        The current time in UTC (GMT) time, or zero if the operation
+*                failed.
+* @stable ICU 2.0
+*/
+inline UDate getTime(UErrorCode& status) const { return getTimeInMillis(status); }
+/**
+* Sets this Calendar's current time with the given UDate. The time specified should
+* be in non-local UTC (GMT) time.
+*
+* @param date  The given UDate in UTC (GMT) time.
+* @param status  Output param set to success/failure code on exit. If any value
+*                set in the time field is invalid or restricted by
+*                leniency, this will be set to an error status.
+* @stable ICU 2.0
+*/
+inline void setTime(UDate date, UErrorCode& status) { setTimeInMillis(date, status); }
+/**
+* Compares the equality of two Calendar objects. Objects of different subclasses
+* are considered unequal. This comparison is very exacting; two Calendar objects
+* must be in exactly the same state to be considered equal. To compare based on the
+* represented time, use equals() instead.
+*
+* @param that  The Calendar object to be compared with.
+* @return      True if the given Calendar is the same as this Calendar; false
+*              otherwise.
+* @stable ICU 2.0
+*/
+virtual UBool 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
+*/
+UBool 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;
+/**
+* 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);
+/**
+* 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);
+/**
+* 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);
+/**
+* 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);
+/**
+* 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);
+/**
+* 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 NULL, this function has no effect.
+*
+* @param value  The given time zone.
+* @stable ICU 2.0
+*/
+void adoptTimeZone(TimeZone* value);
+/**
+* Sets the calendar's time zone to be the same as the one passed in. The TimeZone
+* passed in is _not_ adopted; the client is still responsible for deleting it.
+*
+* @param zone  The given time zone.
+* @stable ICU 2.0
+*/
+void setTimeZone(const TimeZone& zone);
+/**
+* Returns a reference to the time zone owned by this calendar. The returned reference
+* is only valid until clients make another call to adoptTimeZone or setTimeZone,
+* or this Calendar is destroyed.
+*
+* @return   The time zone object associated with this calendar.
+* @stable ICU 2.0
+*/
+const TimeZone& getTimeZone(void) const;
+/**
+* Returns the time zone owned by this calendar. The caller owns the returned object
+* and must delete it when done.  After this call, the new time zone associated
+* with this Calendar is the default TimeZone as returned by TimeZone::createDefault().
+*
+* @return   The time zone object which was associated with this calendar.
+* @stable ICU 2.0
+*/
+TimeZone* orphanTimeZone(void);
+/**
+* Queries if the current date for this Calendar is in Daylight Savings Time.
+*
+* @param status Fill-in parameter which receives the status of this operation.
+* @return   True if the current date for this Calendar is in Daylight Savings Time,
+*           false, otherwise.
+* @stable ICU 2.0
+*/
+virtual UBool inDaylightTime(UErrorCode& status) const = 0;
+/**
+* Specifies whether or not date/time interpretation is to be lenient. With lenient
+* interpretation, a date such as "February 942, 1996" will be treated as being
+* equivalent to the 941st day after February 1, 1996. With strict interpretation,
+* such dates will cause an error when computing time from the time field values
+* representing the dates.
+*
+* @param lenient  True specifies date/time interpretation to be lenient.
+*
+* @see            DateFormat#setLenient
+* @stable ICU 2.0
+*/
+void setLenient(UBool lenient);
+/**
+* Tells whether date/time interpretation is to be lenient.
+*
+* @return   True tells that date/time interpretation is to be lenient.
+* @stable ICU 2.0
+*/
+UBool isLenient(void) const;
+/**
+* Sets the behavior for handling wall time repeating multiple times
+* at negative time zone offset transitions. For example, 1:30 AM on
+* November 6, 2011 in US Eastern time (Ameirca/New_York) occurs twice;
+* 1:30 AM EDT, then 1:30 AM EST one hour later. When <code>UCAL_WALLTIME_FIRST</code>
+* is used, the wall time 1:30AM in this example will be interpreted as 1:30 AM EDT
+* (first occurrence). When <code>UCAL_WALLTIME_LAST</code> is used, it will be
+* interpreted as 1:30 AM EST (last occurrence). The default value is
+* <code>UCAL_WALLTIME_LAST</code>.
+* <p>
+* <b>Note:</b>When <code>UCAL_WALLTIME_NEXT_VALID</code> is not a valid
+* option for this. When the argument is neither <code>UCAL_WALLTIME_FIRST</code>
+* nor <code>UCAL_WALLTIME_LAST</code>, this method has no effect and will keep
+* the current setting.
+*
+* @param option the behavior for handling repeating wall time, either
+* <code>UCAL_WALLTIME_FIRST</code> or <code>UCAL_WALLTIME_LAST</code>.
+* @see #getRepeatedWallTimeOption
+* @stable ICU 49
+*/
+void setRepeatedWallTimeOption(UCalendarWallTimeOption option);
+/**
+* Gets the behavior for handling wall time repeating multiple times
+* at negative time zone offset transitions.
+*
+* @return the behavior for handling repeating wall time, either
+* <code>UCAL_WALLTIME_FIRST</code> or <code>UCAL_WALLTIME_LAST</code>.
+* @see #setRepeatedWallTimeOption
+* @stable ICU 49
+*/
+UCalendarWallTimeOption getRepeatedWallTimeOption(void) const;
+/**
+* Sets the behavior for handling skipped wall time at positive time zone offset
+* transitions. For example, 2:30 AM on March 13, 2011 in US Eastern time (America/New_York)
+* does not exist because the wall time jump from 1:59 AM EST to 3:00 AM EDT. When
+* <code>UCAL_WALLTIME_FIRST</code> is used, 2:30 AM is interpreted as 30 minutes before 3:00 AM
+* EDT, therefore, it will be resolved as 1:30 AM EST. When <code>UCAL_WALLTIME_LAST</code>
+* is used, 2:30 AM is interpreted as 31 minutes after 1:59 AM EST, therefore, it will be
+* resolved as 3:30 AM EDT. When <code>UCAL_WALLTIME_NEXT_VALID</code> is used, 2:30 AM will
+* be resolved as next valid wall time, that is 3:00 AM EDT. The default value is
+* <code>UCAL_WALLTIME_LAST</code>.
+* <p>
+* <b>Note:</b>This option is effective only when this calendar is lenient.
+* When the calendar is strict, such non-existing wall time will cause an error.
+*
+* @param option the behavior for handling skipped wall time at positive time zone
+* offset transitions, one of <code>UCAL_WALLTIME_FIRST</code>, <code>UCAL_WALLTIME_LAST</code> and
+* <code>UCAL_WALLTIME_NEXT_VALID</code>.
+* @see #getSkippedWallTimeOption
+*
+* @stable ICU 49
+*/
+void setSkippedWallTimeOption(UCalendarWallTimeOption option);
+/**
+* Gets the behavior for handling skipped wall time at positive time zone offset
+* transitions.
+*
+* @return the behavior for handling skipped wall time, one of
+* <code>UCAL_WALLTIME_FIRST</code>, <code>UCAL_WALLTIME_LAST</code>
+* and <code>UCAL_WALLTIME_NEXT_VALID</code>.
+* @see #setSkippedWallTimeOption
+* @stable ICU 49
+*/
+UCalendarWallTimeOption getSkippedWallTimeOption(void) const;
+#ifndef U_HIDE_DEPRECATED_API
+/**
+* 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.
+* @deprecated ICU 2.6. Use setFirstDayOfWeek(UCalendarDaysOfWeek value) instead.
+*/
+void setFirstDayOfWeek(EDaysOfWeek value);
+#endif  /* U_HIDE_DEPRECATED_API */
+/**
+* Sets what the first day of the week is; e.g., Sunday in US, Monday in France.
+*
+* @param value  The given first day of the week.
+* @stable ICU 2.6.
+*/
+void setFirstDayOfWeek(UCalendarDaysOfWeek value);
+#ifndef U_HIDE_DEPRECATED_API
+/**
+* Gets what the first day of the week is; e.g., Sunday in US, Monday in France.
+*
+* @return   The first day of the week.
+* @deprecated ICU 2.6 use the overload with error code
+*/
+EDaysOfWeek getFirstDayOfWeek(void) const;
+#endif  /* U_HIDE_DEPRECATED_API */
+/**
+* Gets what the first day of the week is; e.g., Sunday in US, Monday in France.
+*
+* @param status error code
+* @return   The first day of the week.
+* @stable ICU 2.6
+*/
+UCalendarDaysOfWeek getFirstDayOfWeek(UErrorCode &status) const;
+/**
+* Sets what the minimal days required in the first week of the year are; For
+* example, if the first week is defined as one that contains the first day of the
+* first month of a year, call the method with value 1. If it must be a full week,
+* use value 7.
+*
+* @param value  The given minimal days required in the first week of the year.
+* @stable ICU 2.0
+*/
+void setMinimalDaysInFirstWeek(uint8_t value);
+/**
+* Gets what the minimal days required in the first week of the year are; e.g., if
+* the first week is defined as one that contains the first day of the first month
+* of a year, getMinimalDaysInFirstWeek returns 1. If the minimal days required must
+* be a full week, getMinimalDaysInFirstWeek returns 7.
+*
+* @return   The minimal days required in the first week of the year.
+* @stable ICU 2.0
+*/
+uint8_t getMinimalDaysInFirstWeek(void) const;
+/**
+* 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;
+/**
+* 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;
+/**
+* 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;
+/**
+* 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;
+/**
+* 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;
+/**
+* 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;
+/**
+* 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;
+/**
+* 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;
+#ifndef U_HIDE_DEPRECATED_API
+/**
+* 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
+* @deprecated ICU 2.6. Use getActualMaximum(UCalendarDateFields field, UErrorCode& status) instead.
+*/
+int32_t getActualMaximum(EDateFields field, UErrorCode& status) const;
+#endif  /* U_HIDE_DEPRECATED_API */
+/**
+* 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;
+#ifndef U_HIDE_DEPRECATED_API
+/**
+* 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.
+* @deprecated ICU 2.6. Use get(UCalendarDateFields field, UErrorCode& status) instead.
+*/
+int32_t get(EDateFields field, UErrorCode& status) const;
+#endif  /* U_HIDE_DEPRECATED_API */
+/**
+* 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;
+#ifndef U_HIDE_DEPRECATED_API
+/**
+* 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.
+* @deprecated ICU 2.6. Use isSet(UCalendarDateFields field) instead.
+*/
+UBool isSet(EDateFields field) const;
+#endif  /* U_HIDE_DEPRECATED_API */
+/**
+* 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;
+#ifndef U_HIDE_DEPRECATED_API
+/**
+* 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.
+* @deprecated ICU 2.6. Use set(UCalendarDateFields field, int32_t value) instead.
+*/
+void set(EDateFields field, int32_t value);
+#endif  /* U_HIDE_DEPRECATED_API */
+/**
+* Sets the given time field with the given value.
+*
+* @param field  The given time field.
+* @param value  The value to be set for the given time field.
+* @stable ICU 2.6.
+*/
+void set(UCalendarDateFields field, int32_t value);
+/**
+* Sets the values for the fields YEAR, MONTH, and DATE. Other field values are
+* retained; call clear() first if this is not desired.
+*
+* @param year   The value used to set the YEAR time field.
+* @param month  The value used to set the MONTH time field. Month value is 0-based.
+*               e.g., 0 for January.
+* @param date   The value used to set the DATE time field.
+* @stable ICU 2.0
+*/
+void set(int32_t year, int32_t month, int32_t date);
+/**
+* Sets the values for the fields YEAR, MONTH, DATE, HOUR_OF_DAY, and MINUTE. Other
+* field values are retained; call clear() first if this is not desired.
+*
+* @param year    The value used to set the YEAR time field.
+* @param month   The value used to set the MONTH time field. Month value is
+*                0-based. E.g., 0 for January.
+* @param date    The value used to set the DATE time field.
+* @param hour    The value used to set the HOUR_OF_DAY time field.
+* @param minute  The value used to set the MINUTE time field.
+* @stable ICU 2.0
+*/
+void set(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute);
+/**
+* Sets the values for the fields YEAR, MONTH, DATE, HOUR_OF_DAY, MINUTE, and SECOND.
+* Other field values are retained; call clear() first if this is not desired.
+*
+* @param year    The value used to set the YEAR time field.
+* @param month   The value used to set the MONTH time field. Month value is
+*                0-based. E.g., 0 for January.
+* @param date    The value used to set the DATE time field.
+* @param hour    The value used to set the HOUR_OF_DAY time field.
+* @param minute  The value used to set the MINUTE time field.
+* @param second  The value used to set the SECOND time field.
+* @stable ICU 2.0
+*/
+void set(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, int32_t second);
+/**
+* Clears the values of all the time fields, making them both unset and assigning
+* them a value of zero. The field values will be determined during the next
+* resolving of time into time fields.
+* @stable ICU 2.0
+*/
+void clear(void);
+#ifndef U_HIDE_DEPRECATED_API
+/**
+* Clears the value in the given time field, both making it unset and assigning it a
+* value of zero. This field value will be determined during the next resolving of
+* time into time fields.
+*
+* @param field  The time field to be cleared.
+* @deprecated ICU 2.6. Use clear(UCalendarDateFields field) instead.
+*/
+void clear(EDateFields field);
+#endif  /* U_HIDE_DEPRECATED_API */
+/**
+* Clears the value in the given time field, both making it unset and assigning it a
+* value of zero. This field value will be determined during the next resolving of
+* time into time fields.
+*
+* @param field  The time field to be cleared.
+* @stable ICU 2.6.
+*/
+void clear(UCalendarDateFields field);
+/**
+* Returns a unique class ID POLYMORPHICALLY. Pure virtual method. This method is to
+* implement a simple version of RTTI, since not all C++ compilers support genuine
+* RTTI. Polymorphic operator==() and clone() methods call this method.
+* <P>
+* Concrete subclasses of Calendar must implement getDynamicClassID() and also a
+* static method and data member:
+*
+*      static UClassID getStaticClassID() { return (UClassID)&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(void) const = 0;
+/**
+* Returns the calendar type name string for this Calendar object.
+* The returned string is the legacy ICU calendar attribute value,
+* for example, "gregorian" or "japanese".
+*
+* See type="old type name" for the calendar attribute of locale IDs
+* at http://www.unicode.org/reports/tr35/#Key_Type_Definitions
+*
+* Sample code for getting the LDML/BCP 47 calendar key value:
+* \code
+* const char *calType = cal->getType();
+* if (0 == strcmp(calType, "unknown")) {
+*     // deal with unknown calendar type
+* } else {
+*     string localeID("root@calendar=");
+*     localeID.append(calType);
+*     char langTag[100];
+*     UErrorCode errorCode = U_ZERO_ERROR;
+*     int32_t length = uloc_toLanguageTag(localeID.c_str(), langTag, (int32_t)sizeof(langTag), TRUE, &errorCode);
+*     if (U_FAILURE(errorCode)) {
+*         // deal with errors & overflow
+*     }
+*     string lang(langTag, length);
+*     size_t caPos = lang.find("-ca-");
+*     lang.erase(0, caPos + 4);
+*     // lang now contains the LDML calendar type
+* }
+* \endcode
+*
+* @return legacy calendar type name string
+* @stable ICU 49
+*/
+virtual const char * getType() const = 0;
+/**
+* Returns whether the given day of the week is a weekday, a weekend day,
+* or a day that transitions from one to the other, for the locale and
+* calendar system associated with this Calendar (the locale's region is
+* often the most determinant factor). If a transition occurs at midnight,
+* then the days before and after the transition will have the
+* type UCAL_WEEKDAY or UCAL_WEEKEND. If a transition occurs at a time
+* other than midnight, then the day of the transition will have
+* the type UCAL_WEEKEND_ONSET or UCAL_WEEKEND_CEASE. In this case, the
+* method getWeekendTransition() will return the point of
+* transition.
+* @param dayOfWeek The day of the week whose type is desired (UCAL_SUNDAY..UCAL_SATURDAY).
+* @param status The error code for the operation.
+* @return The UCalendarWeekdayType for the day of the week.
+* @stable ICU 4.4
+*/
+virtual UCalendarWeekdayType getDayOfWeekType(UCalendarDaysOfWeek dayOfWeek, UErrorCode &status) const;
+/**
+* Returns the time during the day at which the weekend begins or ends in
+* this calendar system.  If getDayOfWeekType() returns UCAL_WEEKEND_ONSET
+* for the specified dayOfWeek, return the time at which the weekend begins.
+* If getDayOfWeekType() returns UCAL_WEEKEND_CEASE for the specified dayOfWeek,
+* return the time at which the weekend ends. If getDayOfWeekType() returns
+* some other UCalendarWeekdayType for the specified dayOfWeek, is it an error condition
+* (U_ILLEGAL_ARGUMENT_ERROR).
+* @param dayOfWeek The day of the week for which the weekend transition time is
+* desired (UCAL_SUNDAY..UCAL_SATURDAY).
+* @param status The error code for the operation.
+* @return The milliseconds after midnight at which the weekend begins or ends.
+* @stable ICU 4.4
+*/
+virtual int32_t getWeekendTransition(UCalendarDaysOfWeek dayOfWeek, UErrorCode &status) const;
+/**
+* Returns TRUE if the given UDate is in the weekend in
+* this calendar system.
+* @param date The UDate in question.
+* @param status The error code for the operation.
+* @return TRUE if the given UDate is in the weekend in
+* this calendar system, FALSE otherwise.
+* @stable ICU 4.4
+*/
+virtual UBool isWeekend(UDate date, UErrorCode &status) const;
+/**
+* Returns TRUE if this Calendar's current date-time is in the weekend in
+* this calendar system.
+* @return TRUE if this Calendar's current date-time is in the weekend in
+* this calendar system, FALSE otherwise.
+* @stable ICU 4.4
+*/
+virtual UBool isWeekend(void) const;
+protected:
+/**
+* Constructs a Calendar with the default time zone as returned by
+* TimeZone::createInstance(), and the default locale.
+*
+* @param success  Indicates the status of Calendar object construction. Returns
+*                 U_ZERO_ERROR if constructed successfully.
+* @stable ICU 2.0
+*/
+Calendar(UErrorCode& success);
+/**
+* Copy constructor
+*
+* @param source    Calendar object to be copied from
+* @stable ICU 2.0
+*/
+Calendar(const Calendar& source);
+/**
+* Default assignment operator
+*
+* @param right    Calendar object to be copied
+* @stable ICU 2.0
+*/
+Calendar& operator=(const Calendar& right);
+/**
+* Constructs a Calendar with the given time zone and locale. Clients are no longer
+* responsible for deleting the given time zone object after it's adopted.
+*
+* @param zone     The given time zone.
+* @param aLocale  The given locale.
+* @param success  Indicates the status of Calendar object construction. Returns
+*                 U_ZERO_ERROR if constructed successfully.
+* @stable ICU 2.0
+*/
+Calendar(TimeZone* zone, const Locale& aLocale, UErrorCode& success);
+/**
+* Constructs a Calendar with the given time zone and locale.
+*
+* @param zone     The given time zone.
+* @param aLocale  The given locale.
+* @param success  Indicates the status of Calendar object construction. Returns
+*                 U_ZERO_ERROR if constructed successfully.
+* @stable ICU 2.0
+*/
+Calendar(const TimeZone& zone, const Locale& aLocale, UErrorCode& success);
+/**
+* Converts Calendar's time field values to GMT as milliseconds.
+*
+* @param status  Output param set to success/failure code on exit. If any value
+*                previously set in the time field is invalid or restricted by
+*                leniency, this will be set to an error status.
+* @stable ICU 2.0
+*/
+virtual void computeTime(UErrorCode& status);
+/**
+* Converts GMT as milliseconds to time field values. This allows you to sync up the
+* time field values with a new time that is set for the calendar.  This method
+* does NOT recompute the time first; to recompute the time, then the fields, use
+* the method complete().
+*
+* @param status  Output param set to success/failure code on exit. If any value
+*                previously set in the time field is invalid or restricted by
+*                leniency, this will be set to an error status.
+* @stable ICU 2.0
+*/
+virtual void computeFields(UErrorCode& status);
+/**
+* Gets this Calendar's current time as a long.
+*
+* @param status  Output param set to success/failure code on exit. If any value
+*                previously set in the time field is invalid or restricted by
+*                leniency, this will be set to an error status.
+* @return the current time as UTC milliseconds from the epoch.
+* @stable ICU 2.0
+*/
+double getTimeInMillis(UErrorCode& status) const;
+/**
+* Sets this Calendar's current time from the given long value.
+* @param millis  the new time in UTC milliseconds from the epoch.
+* @param status  Output param set to success/failure code on exit. If any value
+*                previously set in the time field is invalid or restricted by
+*                leniency, this will be set to an error status.
+* @stable ICU 2.0
+*/
+void setTimeInMillis( double millis, UErrorCode& status );
+/**
+* Recomputes the current time from currently set fields, and then fills in any
+* unset fields in the time field list.
+*
+* @param status  Output param set to success/failure code on exit. If any value
+*                previously set in the time field is invalid or restricted by
+*                leniency, this will be set to an error status.
+* @stable ICU 2.0
+*/
+void complete(UErrorCode& status);
+#ifndef U_HIDE_DEPRECATED_API
+/**
+* Gets the value for a given time field. Subclasses can use this function to get
+* field values without forcing recomputation of time.
+*
+* @param field  The given time field.
+* @return       The value for the given time field.
+* @deprecated ICU 2.6. Use internalGet(UCalendarDateFields field) instead.
+*/
+inline int32_t internalGet(EDateFields field) const {return fFields[field];}
+#endif  /* U_HIDE_DEPRECATED_API */
+#ifndef U_HIDE_INTERNAL_API
+/**
+* Gets the value for a given time field. Subclasses can use this function to get
+* field values without forcing recomputation of time. If the field's stamp is UNSET,
+* the defaultValue is used.
+*
+* @param field  The given time field.
+* @param defaultValue a default value used if the field is unset.
+* @return       The value for the given time field.
+* @internal
+*/
+inline int32_t internalGet(UCalendarDateFields field, int32_t defaultValue) const {return fStamp[field]>kUnset ? fFields[field] : defaultValue;}
+/**
+* Gets the value for a given time field. Subclasses can use this function to get
+* field values without forcing recomputation of time.
+*
+* @param field  The given time field.
+* @return       The value for the given time field.
+* @internal
+*/
+inline int32_t internalGet(UCalendarDateFields field) const {return fFields[field];}
+#endif  /* U_HIDE_INTERNAL_API */
+#ifndef U_HIDE_DEPRECATED_API
+/**
+* Sets the value for a given time field.  This is a fast internal method for
+* subclasses.  It does not affect the areFieldsInSync, isTimeSet, or areAllFieldsSet
+* flags.
+*
+* @param field    The given time field.
+* @param value    The value for the given time field.
+* @deprecated ICU 2.6. Use internalSet(UCalendarDateFields field, int32_t value) instead.
+*/
+void internalSet(EDateFields field, int32_t value);
+#endif  /* U_HIDE_DEPRECATED_API */
+/**
+* Sets the value for a given time field.  This is a fast internal method for
+* subclasses.  It does not affect the areFieldsInSync, isTimeSet, or areAllFieldsSet
+* flags.
+*
+* @param field    The given time field.
+* @param value    The value for the given time field.
+* @stable ICU 2.6.
+*/
+inline void internalSet(UCalendarDateFields field, int32_t value);
+/**
+* Prepare this calendar for computing the actual minimum or maximum.
+* This method modifies this calendar's fields; it is called on a
+* temporary calendar.
+* @internal
+*/
+virtual void prepareGetActual(UCalendarDateFields field, UBool isMinimum, UErrorCode &status);
+/**
+* Limit enums. Not in sync with UCalendarLimitType (refers to internal fields).
+* @internal
+*/
+enum ELimitType {
+#ifndef U_HIDE_INTERNAL_API
+UCAL_LIMIT_MINIMUM = 0,
+UCAL_LIMIT_GREATEST_MINIMUM,
+UCAL_LIMIT_LEAST_MAXIMUM,
+UCAL_LIMIT_MAXIMUM,
+UCAL_LIMIT_COUNT
+#endif  /* U_HIDE_INTERNAL_API */
+};
+/**
+* Subclass API for defining limits of different types.
+* Subclasses must implement this method to return limits for the
+* following fields:
+*
+* <pre>UCAL_ERA
+* UCAL_YEAR
+* UCAL_MONTH
+* UCAL_WEEK_OF_YEAR
+* UCAL_WEEK_OF_MONTH
+* UCAL_DATE (DAY_OF_MONTH on Java)
+* UCAL_DAY_OF_YEAR
+* UCAL_DAY_OF_WEEK_IN_MONTH
+* UCAL_YEAR_WOY
+* UCAL_EXTENDED_YEAR</pre>
+*
+* @param field one of the above field numbers
+* @param limitType one of <code>MINIMUM</code>, <code>GREATEST_MINIMUM</code>,
+* <code>LEAST_MAXIMUM</code>, or <code>MAXIMUM</code>
+* @internal
+*/
+virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const = 0;
+/**
+* Return a limit for a field.
+* @param field the field, from <code>0..UCAL_MAX_FIELD</code>
+* @param limitType the type specifier for the limit
+* @see #ELimitType
+* @internal
+*/
+virtual int32_t getLimit(UCalendarDateFields field, ELimitType limitType) const;
+/**
+* Return the Julian day number of day before the first day of the
+* given month in the given extended year.  Subclasses should override
+* this method to implement their calendar system.
+* @param eyear the extended year
+* @param month the zero-based month, or 0 if useMonth is false
+* @param useMonth if false, compute the day before the first day of
+* the given year, otherwise, compute the day before the first day of
+* the given month
+* @return the Julian day number of the day before the first
+* day of the given month and year
+* @internal
+*/
+virtual int32_t handleComputeMonthStart(int32_t eyear, int32_t month,
+UBool useMonth) const  = 0;
+/**
+* Return the number of days in the given month of the given extended
+* year of this calendar system.  Subclasses should override this
+* method if they can provide a more correct or more efficient
+* implementation than the default implementation in Calendar.
+* @internal
+*/
+virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month) const ;
+/**
+* Return the number of days in the given extended year of this
+* calendar system.  Subclasses should override this method if they can
+* provide a more correct or more efficient implementation than the
+* default implementation in Calendar.
+* @stable ICU 2.0
+*/
+virtual int32_t handleGetYearLength(int32_t eyear) const;
+/**
+* Return the extended year defined by the current fields.  This will
+* use the UCAL_EXTENDED_YEAR field or the UCAL_YEAR and supra-year fields (such
+* as UCAL_ERA) specific to the calendar system, depending on which set of
+* fields is newer.
+* @return the extended year
+* @internal
+*/
+virtual int32_t handleGetExtendedYear() = 0;
+/**
+* Subclasses may override this.  This method calls
+* handleGetMonthLength() to obtain the calendar-specific month
+* length.
+* @param bestField which field to use to calculate the date
+* @return julian day specified by calendar fields.
+* @internal
+*/
+virtual int32_t handleComputeJulianDay(UCalendarDateFields bestField);
+/**
+* Subclasses must override this to convert from week fields
+* (YEAR_WOY and WEEK_OF_YEAR) to an extended year in the case
+* where YEAR, EXTENDED_YEAR are not set.
+* The Calendar implementation assumes yearWoy is in extended gregorian form
+* @return the extended year, UCAL_EXTENDED_YEAR
+* @internal
+*/
+virtual int32_t handleGetExtendedYearFromWeekFields(int32_t yearWoy, int32_t woy);
+#ifndef U_HIDE_INTERNAL_API
+/**
+* Compute the Julian day from fields.  Will determine whether to use
+* the JULIAN_DAY field directly, or other fields.
+* @return the julian day
+* @internal
+*/
+int32_t computeJulianDay();
+/**
+* Compute the milliseconds in the day from the fields.  This is a
+* value from 0 to 23:59:59.999 inclusive, unless fields are out of
+* range, in which case it can be an arbitrary value.  This value
+* reflects local zone wall time.
+* @internal
+*/
+int32_t 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, int32_t 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;
+/**
+* Values for field resolution tables
+* @see #resolveFields
+* @internal
+*/
+enum {
+/** Marker for end of resolve set (row or group). */
+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.  */
+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[];
+/**
+* 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);
+#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
+*/
+int32_t getActualHelper(UCalendarDateFields field, int32_t startValue, int32_t endValue, UErrorCode &status) const;
+protected:
+/**
+* The flag which indicates if the current time is set in the calendar.
+* @stable ICU 2.0
+*/
+UBool      fIsTimeSet;
+/**
+* True if the fields are in sync with the currently set time of this Calendar.
+* If false, then the next attempt to get the value of a field will
+* force a recomputation of all fields from the current value of the time
+* field.
+* <P>
+* This should really be named areFieldsInSync, but the old name is retained
+* for backward compatibility.
+* @stable ICU 2.0
+*/
+UBool      fAreFieldsSet;
+/**
+* True if all of the fields have been set.  This is initially false, and set to
+* true by computeFields().
+* @stable ICU 2.0
+*/
+UBool      fAreAllFieldsSet;
+/**
+* True if all fields have been virtually set, but have not yet been
+* computed.  This occurs only in setTimeInMillis().  A calendar set
+* to this state will compute all fields from the time if it becomes
+* necessary, but otherwise will delay such computation.
+* @stable ICU 3.0
+*/
+UBool fAreFieldsVirtuallySet;
+/**
+* Get the current time without recomputing.
+*
+* @return     the current time without recomputing.
+* @stable ICU 2.0
+*/
+UDate        internalGetTime(void) const     { return fTime; }
+/**
+* Set the current time without affecting flags or fields.
+*
+* @param time    The time to be set
+* @return        the current time without recomputing.
+* @stable ICU 2.0
+*/
+void        internalSetTime(UDate time)     { fTime = time; }
+/**
+* The time fields containing values into which the millis is computed.
+* @stable ICU 2.0
+*/
+int32_t     fFields[UCAL_FIELD_COUNT];
+/**
+* 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];
+/** Special values of stamp[]
+* @stable ICU 2.0
+*/
+enum {
+kUnset                 = 0,
+kInternallySet,
+kMinimumUserStamp
+};
+/**
+* Pseudo-time-stamps which specify when each field was set. There
+* are two special values, UNSET and INTERNALLY_SET. Values from
+* MINIMUM_USER_SET to Integer.MAX_VALUE are legal user set values.
+* @stable ICU 2.0
+*/
+int32_t        fStamp[UCAL_FIELD_COUNT];
+/**
+* Subclasses may override this method to compute several fields
+* specific to each calendar system.  These are:
+*
+* <ul><li>ERA
+* <li>YEAR
+* <li>MONTH
+* <li>DAY_OF_MONTH
+* <li>DAY_OF_YEAR
+* <li>EXTENDED_YEAR</ul>
+*
+* Subclasses can refer to the DAY_OF_WEEK and DOW_LOCAL fields, which
+* will be set when this method is called.  Subclasses can also call
+* the getGregorianXxx() methods to obtain Gregorian calendar
+* equivalents for the given Julian day.
+*
+* <p>In addition, subclasses should compute any subclass-specific
+* fields, that is, fields from BASE_FIELD_COUNT to
+* getFieldCount() - 1.
+*
+* <p>The default implementation in <code>Calendar</code> implements
+* a pure proleptic Gregorian calendar.
+* @internal
+*/
+virtual void handleComputeFields(int32_t julianDay, UErrorCode &status);
+#ifndef U_HIDE_INTERNAL_API
+/**
+* Return the extended year on the Gregorian calendar as computed by
+* <code>computeGregorianFields()</code>.
+* @internal
+*/
+int32_t getGregorianYear() const {
+return fGregorianYear;
+}
+/**
+* Return the month (0-based) on the Gregorian calendar as computed by
+* <code>computeGregorianFields()</code>.
+* @internal
+*/
+int32_t getGregorianMonth() const {
+return fGregorianMonth;
+}
+/**
+* Return the day of year (1-based) on the Gregorian calendar as
+* computed by <code>computeGregorianFields()</code>.
+* @internal
+*/
+int32_t getGregorianDayOfYear() const {
+return fGregorianDayOfYear;
+}
+/**
+* Return the day of month (1-based) on the Gregorian calendar as
+* computed by <code>computeGregorianFields()</code>.
+* @internal
+*/
+int32_t getGregorianDayOfMonth() const {
+return fGregorianDayOfMonth;
+}
+#endif  /* U_HIDE_INTERNAL_API */
+/**
+* Called by computeJulianDay.  Returns the default month (0-based) for the year,
+* taking year and era into account.  Defaults to 0 for Gregorian, which doesn't care.
+* @param eyear The extended year
+* @internal
+*/
+virtual int32_t getDefaultMonthInYear(int32_t eyear) ;
+/**
+* Called by computeJulianDay.  Returns the default day (1-based) for the month,
+* taking currently-set year and era into account.  Defaults to 1 for Gregorian.
+* @param eyear the extended year
+* @param month the month in the year
+* @internal
+*/
+virtual int32_t getDefaultDayInMonth(int32_t eyear, int32_t month);
+//-------------------------------------------------------------------------
+// Protected utility methods for use by subclasses.  These are very handy
+// for implementing add, roll, and computeFields.
+//-------------------------------------------------------------------------
+/**
+* Adjust the specified field so that it is within
+* the allowable range for the date to which this calendar is set.
+* For example, in a Gregorian calendar pinning the {@link #UCalendarDateFields DAY_OF_MONTH}
+* field for a calendar set to April 31 would cause it to be set
+* to April 30.
+* <p>
+* <b>Subclassing:</b>
+* <br>
+* This utility method is intended for use by subclasses that need to implement
+* their own overrides of {@link #roll roll} and {@link #add add}.
+* <p>
+* <b>Note:</b>
+* <code>pinField</code> is implemented in terms of
+* {@link #getActualMinimum getActualMinimum}
+* and {@link #getActualMaximum getActualMaximum}.  If either of those methods uses
+* a slow, iterative algorithm for a particular field, it would be
+* unwise to attempt to call <code>pinField</code> for that field.  If you
+* really do need to do so, you should override this method to do
+* something more efficient for that field.
+* <p>
+* @param field The calendar field whose value should be pinned.
+* @param status Output param set to failure code on function return
+*          when this function fails.
+*
+* @see #getActualMinimum
+* @see #getActualMaximum
+* @stable ICU 2.0
+*/
+virtual void pinField(UCalendarDateFields field, UErrorCode& status);
+/**
+* Return the week number of a day, within a period. This may be the week number in
+* a year or the week number in a month. Usually this will be a value >= 1, but if
+* some initial days of the period are excluded from week 1, because
+* {@link #getMinimalDaysInFirstWeek getMinimalDaysInFirstWeek} is > 1, then
+* the week number will be zero for those
+* initial days. This method requires the day number and day of week for some
+* known date in the period in order to determine the day of week
+* on the desired day.
+* <p>
+* <b>Subclassing:</b>
+* <br>
+* This method is intended for use by subclasses in implementing their
+* {@link #computeTime computeTime} and/or {@link #computeFields computeFields} methods.
+* It is often useful in {@link #getActualMinimum getActualMinimum} and
+* {@link #getActualMaximum getActualMaximum} as well.
+* <p>
+* This variant is handy for computing the week number of some other
+* day of a period (often the first or last day of the period) when its day
+* of the week is not known but the day number and day of week for some other
+* day in the period (e.g. the current date) <em>is</em> known.
+* <p>
+* @param desiredDay    The {@link #UCalendarDateFields DAY_OF_YEAR} or
+*              {@link #UCalendarDateFields DAY_OF_MONTH} whose week number is desired.
+*              Should be 1 for the first day of the period.
+*
+* @param dayOfPeriod   The {@link #UCalendarDateFields DAY_OF_YEAR}
+*              or {@link #UCalendarDateFields DAY_OF_MONTH} for a day in the period whose
+*              {@link #UCalendarDateFields DAY_OF_WEEK} is specified by the
+*              <code>knownDayOfWeek</code> parameter.
+*              Should be 1 for first day of period.
+*
+* @param dayOfWeek  The {@link #UCalendarDateFields DAY_OF_WEEK} for the day
+*              corresponding to the <code>knownDayOfPeriod</code> parameter.
+*              1-based with 1=Sunday.
+*
+* @return      The week number (one-based), or zero if the day falls before
+*              the first week because
+*              {@link #getMinimalDaysInFirstWeek getMinimalDaysInFirstWeek}
+*              is more than one.
+*
+* @stable ICU 2.8
+*/
+int32_t weekNumber(int32_t desiredDay, int32_t dayOfPeriod, int32_t dayOfWeek);
+#ifndef U_HIDE_INTERNAL_API
+/**
+* Return the week number of a day, within a period. This may be the week number in
+* a year, or the week number in a month. Usually this will be a value >= 1, but if
+* some initial days of the period are excluded from week 1, because
+* {@link #getMinimalDaysInFirstWeek getMinimalDaysInFirstWeek} is > 1,
+* then the week number will be zero for those
+* initial days. This method requires the day of week for the given date in order to
+* determine the result.
+* <p>
+* <b>Subclassing:</b>
+* <br>
+* This method is intended for use by subclasses in implementing their
+* {@link #computeTime computeTime} and/or {@link #computeFields computeFields} methods.
+* It is often useful in {@link #getActualMinimum getActualMinimum} and
+* {@link #getActualMaximum getActualMaximum} as well.
+* <p>
+* @param dayOfPeriod   The {@link #UCalendarDateFields DAY_OF_YEAR} or
+*                      {@link #UCalendarDateFields DAY_OF_MONTH} whose week number is desired.
+*                      Should be 1 for the first day of the period.
+*
+* @param dayOfWeek     The {@link #UCalendarDateFields DAY_OF_WEEK} for the day
+*                      corresponding to the <code>dayOfPeriod</code> parameter.
+*                      1-based with 1=Sunday.
+*
+* @return      The week number (one-based), or zero if the day falls before
+*              the first week because
+*              {@link #getMinimalDaysInFirstWeek getMinimalDaysInFirstWeek}
+*              is more than one.
+* @internal
+*/
+inline int32_t weekNumber(int32_t dayOfPeriod, int32_t dayOfWeek);
+/**
+* returns the local DOW, valid range 0..6
+* @internal
+*/
+int32_t getLocalDOW();
+#endif  /* U_HIDE_INTERNAL_API */
+private:
+/**
+* The next available value for fStamp[]
+*/
+int32_t fNextStamp;// = MINIMUM_USER_STAMP;
+/**
+* Recalculates the time stamp array (fStamp).
+* Resets fNextStamp to lowest next stamp value.
+*/
+void recalculateStamp();
+/**
+* The current time set for the calendar.
+*/
+UDate        fTime;
+/**
+* @see   #setLenient
+*/
+UBool      fLenient;
+/**
+* Time zone affects the time calculation done by Calendar. Calendar subclasses use
+* the time zone data to produce the local time.
+*/
+TimeZone*   fZone;
+/**
+* Option for rpeated 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&)
+* @internal
+*/
+void validateFields(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
+* <code>Calendar::validateField()</code>.
+* @see #validateField(int, int, int, int&)
+* @internal
+*/
+virtual void validateField(UCalendarDateFields field, 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&)}.
+* @internal
+*/
+void validateField(UCalendarDateFields field, int32_t min, int32_t max, UErrorCode& status);
+protected:
+#ifndef U_HIDE_INTERNAL_API
+/**
+* Convert a quasi Julian date to the day of the week. The Julian date used here is
+* not a true Julian date, since it is measured from midnight, not noon. Return
+* value is one-based.
+*
+* @param julian  The given Julian date number.
+* @return   Day number from 1..7 (SUN..SAT).
+* @internal
+*/
+static uint8_t julianDayToDayOfWeek(double julian);
+#endif  /* U_HIDE_INTERNAL_API */
+private:
+char validLocale[ULOC_FULLNAME_CAPACITY];
+char actualLocale[ULOC_FULLNAME_CAPACITY];
+public:
+#if !UCONFIG_NO_SERVICE
+/**
+* INTERNAL FOR 2.6 --  Registration.
+*/
+#ifndef U_HIDE_INTERNAL_API
+/**
+* Return a StringEnumeration over the locales available at the time of the call,
+* including registered locales.
+* @return a StringEnumeration over the locales available at the time of the call
+* @internal
+*/
+static StringEnumeration* getAvailableLocales(void);
+/**
+* Register a new Calendar factory.  The factory will be adopted.
+* INTERNAL in 2.6
+* @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
+* @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;
+#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 NULL if the TimeZone
+* is not an instance of BasicTimeZone.
+*/
+BasicTimeZone* getBasicTimeZone() const;
+};
+// -------------------------------------
+inline Calendar*
+Calendar::createInstance(TimeZone* zone, UErrorCode& errorCode)
+{
+// since the Locale isn't specified, use the default locale
+return createInstance(zone, Locale::getDefault(), errorCode);
+}
+// -------------------------------------
+inline void
+Calendar::roll(UCalendarDateFields field, UBool up, UErrorCode& status)
+{
+roll(field, (int32_t)(up ? +1 : -1), status);
+}
+#ifndef U_HIDE_DEPRECATED_API
+inline void
+Calendar::roll(EDateFields field, UBool up, UErrorCode& status)
+{
+roll((UCalendarDateFields) field, up, status);
+}
+#endif
+// -------------------------------------
+/**
+* Fast method for subclasses.  The caller must maintain fUserSetDSTOffset and
+* fUserSetZoneOffset, as well as the isSet[] array.
+*/
+inline void
+Calendar::internalSet(UCalendarDateFields field, int32_t value)
+{
+fFields[field] = value;
+fStamp[field] = kInternallySet;
+fIsSet[field]     = TRUE; // Remove later
+}
+#ifndef U_HIDE_INTERNAL_API
+inline int32_t  Calendar::weekNumber(int32_t dayOfPeriod, int32_t dayOfWeek)
+{
+return weekNumber(dayOfPeriod, dayOfPeriod, dayOfWeek);
+}
+#endif
+U_NAMESPACE_END
+#endif /* #if !UCONFIG_NO_FORMATTING */
+#endif // _CALENDAR

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intl/icu/source/i18n/unicode/calendar.h