1 // Copyright (C) 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
4 * Copyright (C) 1997-2013, International Business Machines Corporation and others.
6 ********************************************************************************
10 * Modification History:
12 * Date Name Description
13 * 04/22/97 aliu Overhauled header.
14 * 07/28/98 stephen Sync with JDK 1.2
15 * 09/04/98 stephen Re-sync with JDK 8/31 putback
16 * 09/14/98 stephen Changed type of kOneDay, kOneWeek to double.
18 * 10/15/99 aliu Fixed j31, incorrect WEEK_OF_YEAR computation.
19 * Added documentation of WEEK_OF_YEAR computation.
20 * 10/15/99 aliu Fixed j32, cannot set date to Feb 29 2000 AD.
21 * {JDK bug 4210209 4209272}
22 * 11/07/2003 srl Update, clean up documentation.
23 ********************************************************************************
29 #include "unicode/utypes.h"
31 #if !UCONFIG_NO_FORMATTING
33 #include "unicode/calendar.h"
37 * \brief C++ API: Concrete class which provides the standard calendar.
43 * Concrete class which provides the standard calendar used by most of the world.
45 * The standard (Gregorian) calendar has 2 eras, BC and AD.
47 * This implementation handles a single discontinuity, which corresponds by default to
48 * the date the Gregorian calendar was originally instituted (October 15, 1582). Not all
49 * countries adopted the Gregorian calendar then, so this cutover date may be changed by
52 * Prior to the institution of the Gregorian Calendar, New Year's Day was March 25. To
53 * avoid confusion, this Calendar always uses January 1. A manual adjustment may be made
54 * if desired for dates that are prior to the Gregorian changeover and which fall
55 * between January 1 and March 24.
57 * <p>Values calculated for the <code>WEEK_OF_YEAR</code> field range from 1 to
58 * 53. Week 1 for a year is the first week that contains at least
59 * <code>getMinimalDaysInFirstWeek()</code> days from that year. It thus
60 * depends on the values of <code>getMinimalDaysInFirstWeek()</code>,
61 * <code>getFirstDayOfWeek()</code>, and the day of the week of January 1.
62 * Weeks between week 1 of one year and week 1 of the following year are
63 * numbered sequentially from 2 to 52 or 53 (as needed).
65 * <p>For example, January 1, 1998 was a Thursday. If
66 * <code>getFirstDayOfWeek()</code> is <code>MONDAY</code> and
67 * <code>getMinimalDaysInFirstWeek()</code> is 4 (these are the values
68 * reflecting ISO 8601 and many national standards), then week 1 of 1998 starts
69 * on December 29, 1997, and ends on January 4, 1998. If, however,
70 * <code>getFirstDayOfWeek()</code> is <code>SUNDAY</code>, then week 1 of 1998
71 * starts on January 4, 1998, and ends on January 10, 1998; the first three days
72 * of 1998 then are part of week 53 of 1997.
74 * <p>Example for using GregorianCalendar:
77 * // get the supported ids for GMT-08:00 (Pacific Standard Time)
78 * UErrorCode success = U_ZERO_ERROR;
79 * const StringEnumeration *ids = TimeZone::createEnumeration(-8 * 60 * 60 * 1000);
80 * // if no ids were returned, something is wrong. get out.
81 * if (ids == 0 || ids->count(success) == 0) {
86 * cout << "Current Time" << endl;
88 * // create a Pacific Standard Time time zone
89 * SimpleTimeZone* pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, ids->unext(NULL, success)));
91 * // set up rules for daylight savings time
92 * pdt->setStartRule(UCAL_MARCH, 1, UCAL_SUNDAY, 2 * 60 * 60 * 1000);
93 * pdt->setEndRule(UCAL_NOVEMBER, 2, UCAL_SUNDAY, 2 * 60 * 60 * 1000);
95 * // create a GregorianCalendar with the Pacific Daylight time zone
96 * // and the current date and time
97 * Calendar* calendar = new GregorianCalendar( pdt, success );
99 * // print out a bunch of interesting things
100 * cout << "ERA: " << calendar->get( UCAL_ERA, success ) << endl;
101 * cout << "YEAR: " << calendar->get( UCAL_YEAR, success ) << endl;
102 * cout << "MONTH: " << calendar->get( UCAL_MONTH, success ) << endl;
103 * cout << "WEEK_OF_YEAR: " << calendar->get( UCAL_WEEK_OF_YEAR, success ) << endl;
104 * cout << "WEEK_OF_MONTH: " << calendar->get( UCAL_WEEK_OF_MONTH, success ) << endl;
105 * cout << "DATE: " << calendar->get( UCAL_DATE, success ) << endl;
106 * cout << "DAY_OF_MONTH: " << calendar->get( UCAL_DAY_OF_MONTH, success ) << endl;
107 * cout << "DAY_OF_YEAR: " << calendar->get( UCAL_DAY_OF_YEAR, success ) << endl;
108 * cout << "DAY_OF_WEEK: " << calendar->get( UCAL_DAY_OF_WEEK, success ) << endl;
109 * cout << "DAY_OF_WEEK_IN_MONTH: " << calendar->get( UCAL_DAY_OF_WEEK_IN_MONTH, success ) << endl;
110 * cout << "AM_PM: " << calendar->get( UCAL_AM_PM, success ) << endl;
111 * cout << "HOUR: " << calendar->get( UCAL_HOUR, success ) << endl;
112 * cout << "HOUR_OF_DAY: " << calendar->get( UCAL_HOUR_OF_DAY, success ) << endl;
113 * cout << "MINUTE: " << calendar->get( UCAL_MINUTE, success ) << endl;
114 * cout << "SECOND: " << calendar->get( UCAL_SECOND, success ) << endl;
115 * cout << "MILLISECOND: " << calendar->get( UCAL_MILLISECOND, success ) << endl;
116 * cout << "ZONE_OFFSET: " << (calendar->get( UCAL_ZONE_OFFSET, success )/(60*60*1000)) << endl;
117 * cout << "DST_OFFSET: " << (calendar->get( UCAL_DST_OFFSET, success )/(60*60*1000)) << endl;
119 * cout << "Current Time, with hour reset to 3" << endl;
120 * calendar->clear(UCAL_HOUR_OF_DAY); // so doesn't override
121 * calendar->set(UCAL_HOUR, 3);
122 * cout << "ERA: " << calendar->get( UCAL_ERA, success ) << endl;
123 * cout << "YEAR: " << calendar->get( UCAL_YEAR, success ) << endl;
124 * cout << "MONTH: " << calendar->get( UCAL_MONTH, success ) << endl;
125 * cout << "WEEK_OF_YEAR: " << calendar->get( UCAL_WEEK_OF_YEAR, success ) << endl;
126 * cout << "WEEK_OF_MONTH: " << calendar->get( UCAL_WEEK_OF_MONTH, success ) << endl;
127 * cout << "DATE: " << calendar->get( UCAL_DATE, success ) << endl;
128 * cout << "DAY_OF_MONTH: " << calendar->get( UCAL_DAY_OF_MONTH, success ) << endl;
129 * cout << "DAY_OF_YEAR: " << calendar->get( UCAL_DAY_OF_YEAR, success ) << endl;
130 * cout << "DAY_OF_WEEK: " << calendar->get( UCAL_DAY_OF_WEEK, success ) << endl;
131 * cout << "DAY_OF_WEEK_IN_MONTH: " << calendar->get( UCAL_DAY_OF_WEEK_IN_MONTH, success ) << endl;
132 * cout << "AM_PM: " << calendar->get( UCAL_AM_PM, success ) << endl;
133 * cout << "HOUR: " << calendar->get( UCAL_HOUR, success ) << endl;
134 * cout << "HOUR_OF_DAY: " << calendar->get( UCAL_HOUR_OF_DAY, success ) << endl;
135 * cout << "MINUTE: " << calendar->get( UCAL_MINUTE, success ) << endl;
136 * cout << "SECOND: " << calendar->get( UCAL_SECOND, success ) << endl;
137 * cout << "MILLISECOND: " << calendar->get( UCAL_MILLISECOND, success ) << endl;
138 * cout << "ZONE_OFFSET: " << (calendar->get( UCAL_ZONE_OFFSET, success )/(60*60*1000)) << endl; // in hours
139 * cout << "DST_OFFSET: " << (calendar->get( UCAL_DST_OFFSET, success )/(60*60*1000)) << endl; // in hours
141 * if (U_FAILURE(success)) {
142 * cout << "An error occured. success=" << u_errorName(success) << endl;
146 * delete calendar; // also deletes pdt
151 class U_I18N_API GregorianCalendar: public Calendar {
155 * Useful constants for GregorianCalendar and TimeZone.
164 * Constructs a default GregorianCalendar using the current time in the default time
165 * zone with the default locale.
167 * @param success Indicates the status of GregorianCalendar object construction.
168 * Returns U_ZERO_ERROR if constructed successfully.
171 GregorianCalendar(UErrorCode& success);
174 * Constructs a GregorianCalendar based on the current time in the given time zone
175 * with the default locale. Clients are no longer responsible for deleting the given
176 * time zone object after it's adopted.
178 * @param zoneToAdopt The given timezone.
179 * @param success Indicates the status of GregorianCalendar object construction.
180 * Returns U_ZERO_ERROR if constructed successfully.
183 GregorianCalendar(TimeZone* zoneToAdopt, UErrorCode& success);
186 * Constructs a GregorianCalendar based on the current time in the given time zone
187 * with the default locale.
189 * @param zone The given timezone.
190 * @param success Indicates the status of GregorianCalendar object construction.
191 * Returns U_ZERO_ERROR if constructed successfully.
194 GregorianCalendar(const TimeZone& zone, UErrorCode& success);
197 * Constructs a GregorianCalendar based on the current time in the default time zone
198 * with the given locale.
200 * @param aLocale The given locale.
201 * @param success Indicates the status of GregorianCalendar object construction.
202 * Returns U_ZERO_ERROR if constructed successfully.
205 GregorianCalendar(const Locale& aLocale, UErrorCode& success);
208 * Constructs a GregorianCalendar based on the current time in the given time zone
209 * with the given locale. Clients are no longer responsible for deleting the given
210 * time zone object after it's adopted.
212 * @param zoneToAdopt The given timezone.
213 * @param aLocale The given locale.
214 * @param success Indicates the status of GregorianCalendar object construction.
215 * Returns U_ZERO_ERROR if constructed successfully.
218 GregorianCalendar(TimeZone* zoneToAdopt, const Locale& aLocale, UErrorCode& success);
221 * Constructs a GregorianCalendar based on the current time in the given time zone
222 * with the given locale.
224 * @param zone The given timezone.
225 * @param aLocale The given locale.
226 * @param success Indicates the status of GregorianCalendar object construction.
227 * Returns U_ZERO_ERROR if constructed successfully.
230 GregorianCalendar(const TimeZone& zone, const Locale& aLocale, UErrorCode& success);
233 * Constructs a GregorianCalendar with the given AD date set in the default time
234 * zone with the default locale.
236 * @param year The value used to set the YEAR time field in the calendar.
237 * @param month The value used to set the MONTH time field in the calendar. Month
238 * value is 0-based. e.g., 0 for January.
239 * @param date The value used to set the DATE time field in the calendar.
240 * @param success Indicates the status of GregorianCalendar object construction.
241 * Returns U_ZERO_ERROR if constructed successfully.
244 GregorianCalendar(int32_t year, int32_t month, int32_t date, UErrorCode& success);
247 * Constructs a GregorianCalendar with the given AD date and time set for the
248 * default time zone with the default locale.
250 * @param year The value used to set the YEAR time field in the calendar.
251 * @param month The value used to set the MONTH time field in the calendar. Month
252 * value is 0-based. e.g., 0 for January.
253 * @param date The value used to set the DATE time field in the calendar.
254 * @param hour The value used to set the HOUR_OF_DAY time field in the calendar.
255 * @param minute The value used to set the MINUTE time field in the calendar.
256 * @param success Indicates the status of GregorianCalendar object construction.
257 * Returns U_ZERO_ERROR if constructed successfully.
260 GregorianCalendar(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, UErrorCode& success);
263 * Constructs a GregorianCalendar with the given AD date and time set for the
264 * default time zone with the default locale.
266 * @param year The value used to set the YEAR time field in the calendar.
267 * @param month The value used to set the MONTH time field in the calendar. Month
268 * value is 0-based. e.g., 0 for January.
269 * @param date The value used to set the DATE time field in the calendar.
270 * @param hour The value used to set the HOUR_OF_DAY time field in the calendar.
271 * @param minute The value used to set the MINUTE time field in the calendar.
272 * @param second The value used to set the SECOND time field in the calendar.
273 * @param success Indicates the status of GregorianCalendar object construction.
274 * Returns U_ZERO_ERROR if constructed successfully.
277 GregorianCalendar(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, int32_t second, UErrorCode& success);
283 virtual ~GregorianCalendar();
287 * @param source the object to be copied.
290 GregorianCalendar(const GregorianCalendar& source);
293 * Default assignment operator
294 * @param right the object to be copied.
297 GregorianCalendar& operator=(const GregorianCalendar& right);
300 * Create and return a polymorphic copy of this calendar.
301 * @return return a polymorphic copy of this calendar.
304 virtual Calendar* clone(void) const;
307 * Sets the GregorianCalendar change date. This is the point when the switch from
308 * Julian dates to Gregorian dates occurred. Default is 00:00:00 local time, October
309 * 15, 1582. Previous to this time and date will be Julian dates.
311 * @param date The given Gregorian cutover date.
312 * @param success Output param set to success/failure code on exit.
315 void setGregorianChange(UDate date, UErrorCode& success);
318 * Gets the Gregorian Calendar change date. This is the point when the switch from
319 * Julian dates to Gregorian dates occurred. Default is 00:00:00 local time, October
320 * 15, 1582. Previous to this time and date will be Julian dates.
322 * @return The Gregorian cutover time for this calendar.
325 UDate getGregorianChange(void) const;
328 * Return true if the given year is a leap year. Determination of whether a year is
329 * a leap year is actually very complicated. We do something crude and mostly
330 * correct here, but for a real determination you need a lot of contextual
331 * information. For example, in Sweden, the change from Julian to Gregorian happened
332 * in a complex way resulting in missed leap years and double leap years between
333 * 1700 and 1753. Another example is that after the start of the Julian calendar in
334 * 45 B.C., the leap years did not regularize until 8 A.D. This method ignores these
335 * quirks, and pays attention only to the Julian onset date and the Gregorian
336 * cutover (which can be changed).
338 * @param year The given year.
339 * @return True if the given year is a leap year; false otherwise.
342 UBool isLeapYear(int32_t year) const;
345 * Returns TRUE if the given Calendar object is equivalent to this
346 * one. Calendar override.
348 * @param other the Calendar to be compared with this Calendar
351 virtual UBool isEquivalentTo(const Calendar& other) const;
354 * (Overrides Calendar) Rolls up or down by the given amount in the specified field.
355 * For more information, see the documentation for Calendar::roll().
357 * @param field The time field.
358 * @param amount Indicates amount to roll.
359 * @param status Output param set to success/failure code on exit. If any value
360 * previously set in the time field is invalid, this will be set to
362 * @deprecated ICU 2.6. Use roll(UCalendarDateFields field, int32_t amount, UErrorCode& status) instead.
364 virtual void roll(EDateFields field, int32_t amount, UErrorCode& status);
367 * (Overrides Calendar) Rolls up or down by the given amount in the specified field.
368 * For more information, see the documentation for Calendar::roll().
370 * @param field The time field.
371 * @param amount Indicates amount to roll.
372 * @param status Output param set to success/failure code on exit. If any value
373 * previously set in the time field is invalid, this will be set to
377 virtual void roll(UCalendarDateFields field, int32_t amount, UErrorCode& status);
379 #ifndef U_HIDE_DEPRECATED_API
381 * Return the minimum value that this field could have, given the current date.
382 * For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum().
383 * @param field the time field.
384 * @return the minimum value that this field could have, given the current date.
385 * @deprecated ICU 2.6. Use getActualMinimum(UCalendarDateFields field) instead.
387 int32_t getActualMinimum(EDateFields field) const;
390 * Return the minimum value that this field could have, given the current date.
391 * For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum().
392 * @param field the time field.
394 * @return the minimum value that this field could have, given the current date.
395 * @deprecated ICU 2.6. Use getActualMinimum(UCalendarDateFields field) instead. (Added to ICU 3.0 for signature consistency)
397 int32_t getActualMinimum(EDateFields field, UErrorCode& status) const;
398 #endif /* U_HIDE_DEPRECATED_API */
401 * Return the minimum value that this field could have, given the current date.
402 * For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum().
403 * @param field the time field.
404 * @param status error result.
405 * @return the minimum value that this field could have, given the current date.
408 int32_t getActualMinimum(UCalendarDateFields field, UErrorCode &status) const;
410 #ifndef U_HIDE_DEPRECATED_API
412 * Return the maximum value that this field could have, given the current date.
413 * For example, with the date "Feb 3, 1997" and the DAY_OF_MONTH field, the actual
414 * maximum would be 28; for "Feb 3, 1996" it s 29. Similarly for a Hebrew calendar,
415 * for some years the actual maximum for MONTH is 12, and for others 13.
416 * @param field the time field.
417 * @return the maximum value that this field could have, given the current date.
418 * @deprecated ICU 2.6. Use getActualMaximum(UCalendarDateFields field) instead.
420 int32_t getActualMaximum(EDateFields field) const;
421 #endif /* U_HIDE_DEPRECATED_API */
424 * Return the maximum value that this field could have, given the current date.
425 * For example, with the date "Feb 3, 1997" and the DAY_OF_MONTH field, the actual
426 * maximum would be 28; for "Feb 3, 1996" it s 29. Similarly for a Hebrew calendar,
427 * for some years the actual maximum for MONTH is 12, and for others 13.
428 * @param field the time field.
429 * @param status returns any errors that may result from this function call.
430 * @return the maximum value that this field could have, given the current date.
433 virtual int32_t getActualMaximum(UCalendarDateFields field, UErrorCode& status) const;
436 * (Overrides Calendar) Return true if the current date for this Calendar is in
437 * Daylight Savings Time. Recognizes DST_OFFSET, if it is set.
439 * @param status Fill-in parameter which receives the status of this operation.
440 * @return True if the current date for this Calendar is in Daylight Savings Time,
444 virtual UBool inDaylightTime(UErrorCode& status) const;
449 * Override Calendar Returns a unique class ID POLYMORPHICALLY. Pure virtual
450 * override. This method is to implement a simple version of RTTI, since not all C++
451 * compilers support genuine RTTI. Polymorphic operator==() and clone() methods call
454 * @return The class ID for this object. All objects of a given class have the
455 * same class ID. Objects of other classes have different class IDs.
458 virtual UClassID getDynamicClassID(void) const;
461 * Return the class ID for this class. This is useful only for comparing to a return
462 * value from getDynamicClassID(). For example:
464 * Base* polymorphic_pointer = createPolymorphicObject();
465 * if (polymorphic_pointer->getDynamicClassID() ==
466 * Derived::getStaticClassID()) ...
468 * @return The class ID for all objects of this class.
471 static UClassID U_EXPORT2 getStaticClassID(void);
474 * Returns the calendar type name string for this Calendar object.
475 * The returned string is the legacy ICU calendar attribute value,
476 * for example, "gregorian" or "japanese".
478 * For more details see the Calendar::getType() documentation.
480 * @return legacy calendar type name string
483 virtual const char * getType() const;
486 GregorianCalendar(); // default constructor not implemented
490 * Return the ERA. We need a special method for this because the
491 * default ERA is AD, but a zero (unset) ERA is BC.
495 virtual int32_t internalGetEra() const;
498 * Return the Julian day number of day before the first day of the
499 * given month in the given extended year. Subclasses should override
500 * this method to implement their calendar system.
501 * @param eyear the extended year
502 * @param month the zero-based month, or 0 if useMonth is false
503 * @param useMonth if false, compute the day before the first day of
504 * the given year, otherwise, compute the day before the first day of
506 * @return the Julian day number of the day before the first
507 * day of the given month and year
510 virtual int32_t handleComputeMonthStart(int32_t eyear, int32_t month,
511 UBool useMonth) const;
514 * Subclasses may override this. This method calls
515 * handleGetMonthLength() to obtain the calendar-specific month
517 * @param bestField which field to use to calculate the date
518 * @return julian day specified by calendar fields.
521 virtual int32_t handleComputeJulianDay(UCalendarDateFields bestField) ;
524 * Return the number of days in the given month of the given extended
525 * year of this calendar system. Subclasses should override this
526 * method if they can provide a more correct or more efficient
527 * implementation than the default implementation in Calendar.
530 virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month) const;
533 * Return the number of days in the given extended year of this
534 * calendar system. Subclasses should override this method if they can
535 * provide a more correct or more efficient implementation than the
536 * default implementation in Calendar.
539 virtual int32_t handleGetYearLength(int32_t eyear) const;
542 * return the length of the given month.
543 * @param month the given month.
544 * @return the length of the given month.
547 virtual int32_t monthLength(int32_t month) const;
550 * return the length of the month according to the given year.
551 * @param month the given month.
552 * @param year the given year.
553 * @return the length of the month
556 virtual int32_t monthLength(int32_t month, int32_t year) const;
558 #ifndef U_HIDE_INTERNAL_API
560 * return the length of the given year.
561 * @param year the given year.
562 * @return the length of the given year.
565 int32_t yearLength(int32_t year) const;
568 * return the length of the year field.
569 * @return the length of the year field
572 int32_t yearLength(void) const;
575 * After adjustments such as add(MONTH), add(YEAR), we don't want the
576 * month to jump around. E.g., we don't want Jan 31 + 1 month to go to Mar
577 * 3, we want it to go to Feb 28. Adjustments which might run into this
578 * problem call this method to retain the proper month.
581 void pinDayOfMonth(void);
582 #endif /* U_HIDE_INTERNAL_API */
585 * Return the day number with respect to the epoch. January 1, 1970 (Gregorian)
587 * @param status Fill-in parameter which receives the status of this operation.
588 * @return the day number with respect to the epoch.
591 virtual UDate getEpochDay(UErrorCode& status);
594 * Subclass API for defining limits of different types.
595 * Subclasses must implement this method to return limits for the
603 * UCAL_DATE (DAY_OF_MONTH on Java)
605 * UCAL_DAY_OF_WEEK_IN_MONTH
607 * UCAL_EXTENDED_YEAR</pre>
609 * @param field one of the above field numbers
610 * @param limitType one of <code>MINIMUM</code>, <code>GREATEST_MINIMUM</code>,
611 * <code>LEAST_MAXIMUM</code>, or <code>MAXIMUM</code>
614 virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const;
617 * Return the extended year defined by the current fields. This will
618 * use the UCAL_EXTENDED_YEAR field or the UCAL_YEAR and supra-year fields (such
619 * as UCAL_ERA) specific to the calendar system, depending on which set of
621 * @return the extended year
624 virtual int32_t handleGetExtendedYear();
627 * Subclasses may override this to convert from week fields
628 * (YEAR_WOY and WEEK_OF_YEAR) to an extended year in the case
629 * where YEAR, EXTENDED_YEAR are not set.
630 * The Gregorian implementation assumes a yearWoy in gregorian format, according to the current era.
631 * @return the extended year, UCAL_EXTENDED_YEAR
634 virtual int32_t handleGetExtendedYearFromWeekFields(int32_t yearWoy, int32_t woy);
638 * Subclasses may override this method to compute several fields
639 * specific to each calendar system. These are:
646 * <li>EXTENDED_YEAR</ul>
648 * <p>The GregorianCalendar implementation implements
649 * a calendar with the specified Julian/Gregorian cutover date.
652 virtual void handleComputeFields(int32_t julianDay, UErrorCode &status);
656 * Compute the julian day number of the given year.
657 * @param isGregorian if true, using Gregorian calendar, otherwise using Julian calendar
658 * @param year the given year.
659 * @param isLeap true if the year is a leap year.
662 static double computeJulianDayOfYear(UBool isGregorian, int32_t year,
666 * Validates the values of the set time fields. True if they're all valid.
667 * @return True if the set time fields are all valid.
669 UBool validateFields(void) const;
672 * Validates the value of the given time field. True if it's valid.
674 UBool boundsCheck(int32_t value, UCalendarDateFields field) const;
677 * Return the pseudo-time-stamp for two fields, given their
678 * individual pseudo-time-stamps. If either of the fields
679 * is unset, then the aggregate is unset. Otherwise, the
680 * aggregate is the later of the two stamps.
681 * @param stamp_a One given field.
682 * @param stamp_b Another given field.
683 * @return the pseudo-time-stamp for two fields
685 int32_t aggregateStamp(int32_t stamp_a, int32_t stamp_b);
688 * The point at which the Gregorian calendar rules are used, measured in
689 * milliseconds from the standard epoch. Default is October 15, 1582
690 * (Gregorian) 00:00:00 UTC, that is, October 4, 1582 (Julian) is followed
691 * by October 15, 1582 (Gregorian). This corresponds to Julian day number
692 * 2299161. This is measured from the standard epoch, not in Julian Days.
694 UDate fGregorianCutover;
697 * Julian day number of the Gregorian cutover
699 int32_t fCutoverJulianDay;
702 * Midnight, local time (using this Calendar's TimeZone) at or before the
703 * gregorianCutover. This is a pure date value with no time of day or
704 * timezone component.
706 UDate fNormalizedGregorianCutover;// = gregorianCutover;
709 * The year of the gregorianCutover, with 0 representing
710 * 1 BC, -1 representing 2 BC, etc.
712 int32_t fGregorianCutoverYear;// = 1582;
715 * The year of the gregorianCutover, with 0 representing
716 * 1 BC, -1 representing 2 BC, etc.
718 int32_t fGregorianCutoverJulianDay;// = 2299161;
721 * Converts time as milliseconds to Julian date. The Julian date used here is not a
722 * true Julian date, since it is measured from midnight, not noon.
724 * @param millis The given milliseconds.
725 * @return The Julian date number.
727 static double millisToJulianDay(UDate millis);
730 * Converts Julian date to time as milliseconds. The Julian date used here is not a
731 * true Julian date, since it is measured from midnight, not noon.
733 * @param julian The given Julian date number.
734 * @return Time as milliseconds.
736 static UDate julianDayToMillis(double julian);
739 * Used by handleComputeJulianDay() and handleComputeMonthStart().
740 * Temporary field indicating whether the calendar is currently Gregorian as opposed to Julian.
745 * Used by handleComputeJulianDay() and handleComputeMonthStart().
746 * Temporary field indicating that the sense of the gregorian cutover should be inverted
747 * to handle certain calculations on and around the cutover date.
749 UBool fInvertGregorian;
752 public: // internal implementation
755 * @return TRUE if this calendar has the notion of a default century
758 virtual UBool haveDefaultCentury() const;
761 * @return the start of the default century
764 virtual UDate defaultCenturyStart() const;
767 * @return the beginning year of the default century
770 virtual int32_t defaultCenturyStartYear() const;
775 #endif /* #if !UCONFIG_NO_FORMATTING */