| /* |
| ******************************************************************************** |
| * * |
| * COPYRIGHT: * |
| * (C) Copyright Taligent, Inc., 1997 * |
| * (C) Copyright International Business Machines Corporation, 1997-1999 * |
| * Licensed Material - Program-Property of IBM - All Rights Reserved. * |
| * US Government Users Restricted Rights - Use, duplication, or disclosure * |
| * restricted by GSA ADP Schedule Contract with IBM Corp. * |
| * * |
| ******************************************************************************** |
| * |
| * File GREGOCAL.H |
| * |
| * Modification History: |
| * |
| * Date Name Description |
| * 04/22/97 aliu Overhauled header. |
| * 07/28/98 stephen Sync with JDK 1.2 |
| * 09/04/98 stephen Re-sync with JDK 8/31 putback |
| * 09/14/98 stephen Changed type of kOneDay, kOneWeek to double. |
| * Fixed bug in roll() |
| ******************************************************************************** |
| */ |
| |
| #ifndef GREGOCAL_H |
| #define GREGOCAL_H |
| |
| |
| #include "calendar.h" |
| |
| /** |
| * Concrete class which provides the standard calendar used by most of the world. |
| * <P> |
| * The standard (Gregorian) calendar has 2 eras, BC and AD. |
| * <P> |
| * This implementation handles a single discontinuity, which corresponds by default to |
| * the date the Gregorian calendar was originally instituted (October 15, 1582). Not all |
| * countries adopted the Gregorian calendar then, so this cutover date may be changed by |
| * the caller. |
| * <P> |
| * Prior to the institution of the Gregorian Calendar, New Year's Day was March 25. To |
| * avoid confusion, this Calendar always uses January 1. A manual adjustment may be made |
| * if desired for dates that are prior to the Gregorian changeover and which fall |
| * between January 1 and March 24. |
| * <P> |
| * Example for using GregorianCalendar: |
| * <pre> |
| * . // get the supported ids for GMT-08:00 (Pacific Standard Time) |
| * . int32_t idsCount; |
| * . const UnicodeString** ids = TimeZone::createAvailableIDs(-8 * 60 * 60 * 1000, idsCount); |
| * . // if no ids were returned, something is wrong. get out. |
| * . if (idsCount == 0) { |
| * . return; |
| * . } |
| * . |
| * . // begin output |
| * . cout << "Current Time" << endl; |
| * . |
| * . // create a Pacific Standard Time time zone |
| * . SimpleTimeZone* pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, *(ids[0])); |
| * . |
| * . // set up rules for daylight savings time |
| * . pdt->setStartRule(Calendar::APRIL, 1, Calendar::SUNDAY, 2 * 60 * 60 * 1000); |
| * . pdt->setEndRule(Calendar::OCTOBER, -1, Calendar::SUNDAY, 2 * 60 * 60 * 1000); |
| * . |
| * . // create a GregorianCalendar with the Pacific Daylight time zone |
| * . // and the current date and time |
| * . UErrorCode success = ZERO_ERROR; |
| * . Calendar* calendar = new GregorianCalendar( pdt, success ); |
| * . |
| * . // print out a bunch of interesting things |
| * . cout << "ERA: " << calendar->get( Calendar::ERA, success ) << endl; |
| * . cout << "YEAR: " << calendar->get( Calendar::YEAR, success ) << endl; |
| * . cout << "MONTH: " << calendar->get( Calendar::MONTH, success ) << endl; |
| * . cout << "WEEK_OF_YEAR: " << calendar->get( Calendar::WEEK_OF_YEAR, success ) << endl; |
| * . cout << "WEEK_OF_MONTH: " << calendar->get( Calendar::WEEK_OF_MONTH, success ) << endl; |
| * . cout << "DATE: " << calendar->get( Calendar::DATE, success ) << endl; |
| * . cout << "DAY_OF_MONTH: " << calendar->get( Calendar::DAY_OF_MONTH, success ) << endl; |
| * . cout << "DAY_OF_YEAR: " << calendar->get( Calendar::DAY_OF_YEAR, success ) << endl; |
| * . cout << "DAY_OF_WEEK: " << calendar->get( Calendar::DAY_OF_WEEK, success ) << endl; |
| * . cout << "DAY_OF_WEEK_IN_MONTH: " << calendar->get( Calendar::DAY_OF_WEEK_IN_MONTH, success ) << endl; |
| * . cout << "AM_PM: " << calendar->get( Calendar::AM_PM, success ) << endl; |
| * . cout << "HOUR: " << calendar->get( Calendar::HOUR, success ) << endl; |
| * . cout << "HOUR_OF_DAY: " << calendar->get( Calendar::HOUR_OF_DAY, success ) << endl; |
| * . cout << "MINUTE: " << calendar->get( Calendar::MINUTE, success ) << endl; |
| * . cout << "SECOND: " << calendar->get( Calendar::SECOND, success ) << endl; |
| * . cout << "MILLISECOND: " << calendar->get( Calendar::MILLISECOND, success ) << endl; |
| * . cout << "ZONE_OFFSET: " << (calendar->get( Calendar::ZONE_OFFSET, success )/(60*60*1000)) << endl; |
| * . cout << "DST_OFFSET: " << (calendar->get( Calendar::DST_OFFSET, success )/(60*60*1000)) << endl; |
| * . |
| * . cout << "Current Time, with hour reset to 3" << endl; |
| * . calendar->clear(Calendar::HOUR_OF_DAY); // so doesn't override |
| * . calendar->set(Calendar::HOUR, 3); |
| * . cout << "ERA: " << calendar->get( Calendar::ERA, success ) << endl; |
| * . cout << "YEAR: " << calendar->get( Calendar::YEAR, success ) << endl; |
| * . cout << "MONTH: " << calendar->get( Calendar::MONTH, success ) << endl; |
| * . cout << "WEEK_OF_YEAR: " << calendar->get( Calendar::WEEK_OF_YEAR, success ) << endl; |
| * . cout << "WEEK_OF_MONTH: " << calendar->get( Calendar::WEEK_OF_MONTH, success ) << endl; |
| * . cout << "DATE: " << calendar->get( Calendar::DATE, success ) << endl; |
| * . cout << "DAY_OF_MONTH: " << calendar->get( Calendar::DAY_OF_MONTH, success ) << endl; |
| * . cout << "DAY_OF_YEAR: " << calendar->get( Calendar::DAY_OF_YEAR, success ) << endl; |
| * . cout << "DAY_OF_WEEK: " << calendar->get( Calendar::DAY_OF_WEEK, success ) << endl; |
| * . cout << "DAY_OF_WEEK_IN_MONTH: " << calendar->get( Calendar::DAY_OF_WEEK_IN_MONTH, success ) << endl; |
| * . cout << "AM_PM: " << calendar->get( Calendar::AM_PM, success ) << endl; |
| * . cout << "HOUR: " << calendar->get( Calendar::HOUR, success ) << endl; |
| * . cout << "HOUR_OF_DAY: " << calendar->get( Calendar::HOUR_OF_DAY, success ) << endl; |
| * . cout << "MINUTE: " << calendar->get( Calendar::MINUTE, success ) << endl; |
| * . cout << "SECOND: " << calendar->get( Calendar::SECOND, success ) << endl; |
| * . cout << "MILLISECOND: " << calendar->get( Calendar::MILLISECOND, success ) << endl; |
| * . cout << "ZONE_OFFSET: " << (calendar->get( Calendar::ZONE_OFFSET, success )/(60*60*1000)) << endl; // in hours |
| * . cout << "DST_OFFSET: " << (calendar->get( Calendar::DST_OFFSET, success )/(60*60*1000)) << endl; // in hours |
| * . |
| * . delete[] ids; |
| * . delete calendar; // also deletes pdt |
| * . |
| * </pre> |
| */ |
| class U_I18N_API GregorianCalendar: public Calendar { |
| public: |
| |
| /** |
| * Useful constants for GregorianCalendar and TimeZone. |
| */ |
| enum EEras { |
| BC, |
| AD |
| }; |
| |
| /** |
| * Constructs a default GregorianCalendar using the current time in the default time |
| * zone with the default locale. |
| * |
| * @param success Indicates the status of GregorianCalendar object construction. |
| * Returns ZERO_ERROR if constructed successfully. |
| */ |
| GregorianCalendar(UErrorCode& success); |
| |
| /** |
| * Constructs a GregorianCalendar based on the current time in the given time zone |
| * with the default locale. Clients are no longer responsible for deleting the given |
| * time zone object after it's adopted. |
| * |
| * @param zoneToAdopt The given timezone. |
| * @param success Indicates the status of GregorianCalendar object construction. |
| * Returns ZERO_ERROR if constructed successfully. |
| */ |
| GregorianCalendar(TimeZone* zoneToAdopt, UErrorCode& success); |
| |
| /** |
| * Constructs a GregorianCalendar based on the current time in the given time zone |
| * with the default locale. |
| * |
| * @param zone The given timezone. |
| * @param success Indicates the status of GregorianCalendar object construction. |
| * Returns ZERO_ERROR if constructed successfully. |
| */ |
| GregorianCalendar(const TimeZone& zone, UErrorCode& success); |
| |
| /** |
| * Constructs a GregorianCalendar based on the current time in the default time zone |
| * with the given locale. |
| * |
| * @param aLocale The given locale. |
| * @param success Indicates the status of GregorianCalendar object construction. |
| * Returns ZERO_ERROR if constructed successfully. |
| */ |
| GregorianCalendar(const Locale& aLocale, UErrorCode& success); |
| |
| /** |
| * Constructs a GregorianCalendar based on the current time in the given time zone |
| * with the given locale. Clients are no longer responsible for deleting the given |
| * time zone object after it's adopted. |
| * |
| * @param zoneToAdopt The given timezone. |
| * @param aLocale The given locale. |
| * @param success Indicates the status of GregorianCalendar object construction. |
| * Returns ZERO_ERROR if constructed successfully. |
| */ |
| GregorianCalendar(TimeZone* zoneToAdopt, const Locale& aLocale, UErrorCode& success); |
| |
| /** |
| * Constructs a GregorianCalendar based on the current time in the given time zone |
| * with the given locale. |
| * |
| * @param zone The given timezone. |
| * @param aLocale The given locale. |
| * @param success Indicates the status of GregorianCalendar object construction. |
| * Returns ZERO_ERROR if constructed successfully. |
| */ |
| GregorianCalendar(const TimeZone& zone, const Locale& aLocale, UErrorCode& success); |
| |
| /** |
| * Constructs a GregorianCalendar with the given AD date set in the default time |
| * zone with the default locale. |
| * |
| * @param year The value used to set the YEAR time field in the calendar. |
| * @param month The value used to set the MONTH time field in the calendar. Month |
| * value is 0-based. e.g., 0 for January. |
| * @param date The value used to set the DATE time field in the calendar. |
| * @param success Indicates the status of GregorianCalendar object construction. |
| * Returns ZERO_ERROR if constructed successfully. |
| */ |
| GregorianCalendar(int32_t year, int32_t month, int32_t date, UErrorCode& success); |
| |
| /** |
| * Constructs a GregorianCalendar with the given AD date and time set for the |
| * default time zone with the default locale. |
| * |
| * @param year The value used to set the YEAR time field in the calendar. |
| * @param month The value used to set the MONTH time field in the calendar. Month |
| * value is 0-based. e.g., 0 for January. |
| * @param date The value used to set the DATE time field in the calendar. |
| * @param hour The value used to set the HOUR_OF_DAY time field in the calendar. |
| * @param minute The value used to set the MINUTE time field in the calendar. |
| * @param success Indicates the status of GregorianCalendar object construction. |
| * Returns ZERO_ERROR if constructed successfully. |
| */ |
| GregorianCalendar(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, UErrorCode& success); |
| |
| /** |
| * Constructs a GregorianCalendar with the given AD date and time set for the |
| * default time zone with the default locale. |
| * |
| * @param year The value used to set the YEAR time field in the calendar. |
| * @param month The value used to set the MONTH time field in the calendar. Month |
| * value is 0-based. e.g., 0 for January. |
| * @param date The value used to set the DATE time field in the calendar. |
| * @param hour The value used to set the HOUR_OF_DAY time field in the calendar. |
| * @param minute The value used to set the MINUTE time field in the calendar. |
| * @param second The value used to set the SECOND time field in the calendar. |
| * @param success Indicates the status of GregorianCalendar object construction. |
| * Returns ZERO_ERROR if constructed successfully. |
| */ |
| GregorianCalendar(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, int32_t second, UErrorCode& success); |
| |
| /** |
| * Destructor |
| */ |
| virtual ~GregorianCalendar(); |
| |
| /** |
| * Copy constructor |
| */ |
| GregorianCalendar(const GregorianCalendar& source); |
| |
| /** |
| * Default assignment operator |
| */ |
| GregorianCalendar& operator=(const GregorianCalendar& right); |
| |
| /** |
| * Create and return a polymorphic copy of this calendar. |
| */ |
| virtual Calendar* clone(void) const; |
| |
| /** |
| * Sets the GregorianCalendar change date. This is the point when the switch from |
| * Julian dates to Gregorian dates occurred. Default is 00:00:00 local time, October |
| * 15, 1582. Previous to this time and date will be Julian dates. |
| * |
| * @param date The given Gregorian cutover date. |
| * @param success Output param set to success/failure code on exit. |
| */ |
| void setGregorianChange(UDate date, UErrorCode& success); |
| |
| /** |
| * Gets the Gregorian Calendar change date. This is the point when the switch from |
| * Julian dates to Gregorian dates occurred. Default is 00:00:00 local time, October |
| * 15, 1582. Previous to this time and date will be Julian dates. |
| * |
| * @return The Gregorian cutover time for this calendar. |
| */ |
| UDate getGregorianChange(void) const; |
| |
| /** |
| * Return true if the given year is a leap year. Determination of whether a year is |
| * a leap year is actually very complicated. We do something crude and mostly |
| * correct here, but for a real determination you need a lot of contextual |
| * information. For example, in Sweden, the change from Julian to Gregorian happened |
| * in a complex way resulting in missed leap years and double leap years between |
| * 1700 and 1753. Another example is that after the start of the Julian calendar in |
| * 45 B.C., the leap years did not regularize until 8 A.D. This method ignores these |
| * quirks, and pays attention only to the Julian onset date and the Gregorian |
| * cutover (which can be changed). |
| * |
| * @param year The given year. |
| * @return True if the given year is a leap year; false otherwise. |
| */ |
| bool_t isLeapYear(int32_t year) const; |
| |
| /** |
| * Compares the equality of two GregorianCalendar objects. Objects of different |
| * subclasses are considered unequal. This is a strict equality test; see the |
| * documentation for Calendar::operator==(). |
| * |
| * @param that The GregorianCalendar object to be compared with. |
| * @return True if the given GregorianCalendar is the same as this |
| * GregorianCalendar; false otherwise. |
| */ |
| virtual bool_t operator==(const Calendar& that) const; |
| |
| /** |
| * Calendar override. |
| * Return true if another Calendar object is equivalent to this one. An equivalent |
| * Calendar will behave exactly as this one does, but may be set to a different time. |
| */ |
| virtual bool_t equivalentTo(const Calendar& other) const; |
| |
| /** |
| * (Overrides Calendar) UDate Arithmetic function. Adds the specified (signed) amount |
| * of time to the given time field, based on the calendar's rules. For more |
| * information, see the documentation for Calendar::add(). |
| * |
| * @param field The time field. |
| * @param amount The amount of date or time to be added to the field. |
| * @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. |
| */ |
| virtual void add(EDateFields field, int32_t amount, UErrorCode& status); |
| |
| /** |
| * (Overrides Calendar) Rolls up or down by the given amount in the specified field. |
| * For more information, see the documentation for Calendar::roll(). |
| * |
| * @param field The time field. |
| * @param amount Indicates amount to roll. |
| * @param status Output param set to success/failure code on exit. If any value |
| * previously set in the time field is invalid, this will be set to |
| * an error status. |
| */ |
| virtual void roll(EDateFields field, int32_t amount, UErrorCode& status); |
| |
| /** |
| * (Overrides Calendar) Returns minimum value for the given field. e.g. for |
| * Gregorian DAY_OF_MONTH, 1. |
| */ |
| virtual int32_t getMinimum(EDateFields field) const; |
| |
| /** |
| * (Overrides Calendar) Returns maximum value for the given field. e.g. for |
| * Gregorian DAY_OF_MONTH, 31. |
| */ |
| virtual int32_t getMaximum(EDateFields field) const; |
| |
| /** |
| * (Overrides Calendar) Returns highest minimum value for the given field if varies. |
| * Otherwise same as getMinimum(). For Gregorian, no difference. |
| */ |
| virtual int32_t getGreatestMinimum(EDateFields field) const; |
| |
| /** |
| * (Overrides Calendar) Returns lowest maximum value for the given field if varies. |
| * Otherwise same as getMaximum(). For Gregorian DAY_OF_MONTH, 28. |
| */ |
| virtual int32_t getLeastMaximum(EDateFields field) const; |
| |
| /** |
| * Return the minimum value that this field could have, given the current date. |
| * For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum(). |
| */ |
| int32_t getActualMinimum(EDateFields field) const; |
| |
| /** |
| * Return the maximum value that this field could have, given the current date. |
| * For example, with the date "Feb 3, 1997" and the DAY_OF_MONTH field, the actual |
| * maximum would be 28; for "Feb 3, 1996" it s 29. Similarly for a Hebrew calendar, |
| * for some years the actual maximum for MONTH is 12, and for others 13. |
| */ |
| int32_t getActualMaximum(EDateFields field) const; |
| |
| /** |
| * (Overrides Calendar) Return true if the current date for this Calendar is in |
| * Daylight Savings Time. Recognizes DST_OFFSET, if it is set. |
| * |
| * @param status Fill-in parameter which receives the status of this operation. |
| * @return True if the current date for this Calendar is in Daylight Savings Time, |
| * false, otherwise. |
| */ |
| virtual bool_t inDaylightTime(UErrorCode& status) const; |
| |
| public: |
| |
| /** |
| * Override Calendar Returns a unique class ID POLYMORPHICALLY. Pure virtual |
| * override. This method is to implement a simple version of RTTI, since not all C++ |
| * compilers support genuine RTTI. Polymorphic operator==() and clone() methods call |
| * this method. |
| * |
| * @return The class ID for this object. All objects of a given class have the |
| * same class ID. Objects of other classes have different class IDs. |
| */ |
| virtual ClassID getDynamicClassID(void) const { return (ClassID)&fgClassID; } |
| |
| /** |
| * Return the class ID for this class. This is useful only for comparing to a return |
| * value from getDynamicClassID(). For example: |
| * |
| * Base* polymorphic_pointer = createPolymorphicObject(); |
| * if (polymorphic_pointer->getDynamicClassID() == |
| * Derived::getStaticClassID()) ... |
| * |
| * @return The class ID for all objects of this class. |
| */ |
| static ClassID getStaticClassID(void) { return (ClassID)&fgClassID; } |
| |
| protected: |
| |
| /** |
| * (Overrides Calendar) Converts GMT as milliseconds to time field values. |
| */ |
| virtual void computeFields(UErrorCode& status); |
| |
| /** |
| * (Overrides Calendar) 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, this will be set to |
| * an error status. |
| */ |
| virtual void computeTime(UErrorCode& status); |
| |
| private: |
| |
| /** |
| * Return the year that corresponds to the <code>WEEK_OF_YEAR</code> field. |
| * This may be one year before or after the calendar year stored |
| * in the <code>YEAR</code> field. For example, January 1, 1999 is considered |
| * Friday of week 53 of 1998 (if minimal days in first week is |
| * 2 or less, and the first day of the week is Sunday). Given |
| * these same settings, the ISO year of January 1, 1999 is |
| * 1998. |
| * <p> |
| * Warning: This method will complete all fields. |
| * @return the year corresponding to the <code>WEEK_OF_YEAR</code> field, which |
| * may be one year before or after the <code>YEAR</code> field. |
| * @see #WEEK_OF_YEAR |
| */ |
| int32_t getISOYear(UErrorCode& status); |
| |
| // this is 2^52 - 1, the largest allowable mantissa with a 0 exponent in a 64-bit double |
| static const UDate EARLIEST_SUPPORTED_MILLIS; |
| static const UDate LATEST_SUPPORTED_MILLIS; |
| |
| int32_t monthLength(int32_t month) const; |
| int32_t monthLength(int32_t month, int32_t year) const; |
| |
| int32_t yearLength(int32_t year) const; |
| |
| int32_t yearLength(void) const; |
| |
| /** |
| * After adjustments such as add(MONTH), add(YEAR), we don't want the |
| * month to jump around. E.g., we don't want Jan 31 + 1 month to go to Mar |
| * 3, we want it to go to Feb 28. Adjustments which might run into this |
| * problem call this method to retain the proper month. |
| */ |
| void pinDayOfMonth(void); |
| |
| /** |
| * Return the day number with respect to the epoch. January 1, 1970 (Gregorian) |
| * is day zero. |
| */ |
| UDate getEpochDay(UErrorCode& status); |
| |
| /** |
| * Compute the Julian day number under either the Gregorian or the |
| * Julian calendar, using the given year and the remaining fields. |
| * @param isGregorian if true, use the Gregorian calendar |
| * @param year the adjusted year number, with 0 indicating the |
| * year 1 BC, -1 indicating 2 BC, etc. |
| * @return the Julian day number |
| */ |
| double computeJulianDay(bool_t isGregorian, int32_t year); |
| |
| /** |
| * Compute the date-based fields given the milliseconds since the epoch start. Do |
| * not compute the time-based fields (HOUR, MINUTE, etc.). |
| * |
| * @param theTime the time in wall millis (either Standard or DST), |
| * whichever is in effect |
| * @param quick if true, only compute the ERA, YEAR, MONTH, DATE, |
| * DAY_OF_WEEK, and DAY_OF_YEAR. |
| */ |
| void timeToFields(UDate theTime, bool_t quick, 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 |
| * minimalDaysInFirstWeek is > 1, then the week number will be zero for those |
| * initial days. Requires the day of week for the given date in order to determine |
| * the day of week of the first day of the period. |
| * |
| * @param date Day-of-year or day-of-month. Should be 1 for first day of period. |
| * @param day Day-of-week for given dayOfPeriod. 1-based with 1=Sunday. |
| * @return Week number, one-based, or zero if the day falls in part of the |
| * month before the first week, when there are days before the first |
| * week because the minimum days in the first week is more than one. |
| */ |
| int32_t weekNumber(int32_t date, int32_t day); |
| |
| /** |
| * Validates the values of the set time fields. True if they're all valid. |
| */ |
| bool_t validateFields(void) const; |
| |
| /** |
| * Validates the value of the given time field. True if it's valid. |
| */ |
| bool_t boundsCheck(int32_t value, EDateFields field) const; |
| |
| /** |
| * Return the pseudo-time-stamp for two fields, given their |
| * individual pseudo-time-stamps. If either of the fields |
| * is unset, then the aggregate is unset. Otherwise, the |
| * aggregate is the later of the two stamps. |
| */ |
| EStampValues aggregateStamp(EStampValues stamp_a, EStampValues stamp_b); |
| |
| /** |
| * The point at which the Gregorian calendar rules are used, measured in |
| * milliseconds from the standard epoch. Default is October 15, 1582 |
| * (Gregorian) 00:00:00 UTC, that is, October 4, 1582 (Julian) is followed |
| * by October 15, 1582 (Gregorian). This corresponds to Julian day number |
| * 2299161. |
| */ |
| // This is measured from the standard epoch, not in Julian Days. |
| UDate fGregorianCutover; |
| |
| /** |
| * Midnight, local time (using this Calendar's TimeZone) at or before the |
| * gregorianCutover. This is a pure date value with no time of day or |
| * timezone component. |
| */ |
| UDate fNormalizedGregorianCutover;// = gregorianCutover; |
| |
| /** |
| * The year of the gregorianCutover, with 0 representing |
| * 1 BC, -1 representing 2 BC, etc. |
| */ |
| int32_t fGregorianCutoverYear;// = 1582; |
| |
| static char fgClassID; |
| |
| /** |
| * Converts time as milliseconds to Julian date. The Julian date used here is not a |
| * true Julian date, since it is measured from midnight, not noon. |
| * |
| * @param millis The given milliseconds. |
| * @return The Julian date number. |
| */ |
| static double millisToJulianDay(UDate millis); |
| |
| /** |
| * Converts Julian date to time as milliseconds. The Julian date used here is not a |
| * true Julian date, since it is measured from midnight, not noon. |
| * |
| * @param julian The given Julian date number. |
| * @return Time as milliseconds. |
| */ |
| static UDate julianDayToMillis(double julian); |
| |
| /** |
| * 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. |
| * |
| * @return Day number from 1..7 (SUN..SAT). |
| */ |
| static uint8_t julianDayToDayOfWeek(double julian); |
| |
| /** |
| * Divide two long integers, returning the floor of the quotient. |
| * <p> |
| * Unlike the built-in division, this is mathematically well-behaved. |
| * E.g., <code>-1/4</code> => 0 |
| * but <code>floorDivide(-1,4)</code> => -1. |
| * @param numerator the numerator |
| * @param denominator a divisor which must be > 0 |
| * @return the floor of the quotient. |
| */ |
| static double floorDivide(double numerator, double denominator); |
| |
| /** |
| * Divide two integers, returning the floor of the quotient. |
| * <p> |
| * Unlike the built-in division, this is mathematically well-behaved. |
| * E.g., <code>-1/4</code> => 0 |
| * but <code>floorDivide(-1,4)</code> => -1. |
| * @param numerator the numerator |
| * @param denominator a divisor which must be > 0 |
| * @return the floor of the quotient. |
| */ |
| static int32_t floorDivide(int32_t numerator, int32_t denominator); |
| |
| /** |
| * Divide two integers, returning the floor of the quotient, and |
| * the modulus remainder. |
| * <p> |
| * Unlike the built-in division, this is mathematically well-behaved. |
| * E.g., <code>-1/4</code> => 0 and <code>-1%4</code> => -1, |
| * but <code>floorDivide(-1,4)</code> => -1 with <code>remainder[0]</code> => 3. |
| * @param numerator the numerator |
| * @param denominator a divisor which must be > 0 |
| * @param remainder an array of at least one element in which the value |
| * <code>numerator mod denominator</code> is returned. Unlike <code>numerator |
| * % denominator</code>, this will always be non-negative. |
| * @return the floor of the quotient. |
| */ |
| static int32_t floorDivide(int32_t numerator, int32_t denominator, int32_t remainder[]); |
| |
| /** |
| * Divide two integers, returning the floor of the quotient, and |
| * the modulus remainder. |
| * <p> |
| * Unlike the built-in division, this is mathematically well-behaved. |
| * E.g., <code>-1/4</code> => 0 and <code>-1%4</code> => -1, |
| * but <code>floorDivide(-1,4)</code> => -1 with <code>remainder[0]</code> => 3. |
| * @param numerator the numerator |
| * @param denominator a divisor which must be > 0 |
| * @param remainder an array of at least one element in which the value |
| * <code>numerator mod denominator</code> is returned. Unlike <code>numerator |
| * % denominator</code>, this will always be non-negative. |
| * @return the floor of the quotient. |
| */ |
| static int32_t floorDivide(double numerator, int32_t denominator, int32_t remainder[]); |
| |
| |
| static const UDate kPapalCutover; // Cutover decreed by Pope Gregory |
| |
| static const int32_t kJan1_1JulianDay; // January 1, year 1 (Gregorian) |
| static const int32_t kEpochStartAsJulianDay; // January 1, 1970 (Gregorian) |
| static const int32_t kEpochYear; |
| |
| static const int32_t kNumDays []; |
| static const int32_t kLeapNumDays []; |
| static const int32_t kMonthLength []; |
| static const int32_t kLeapMonthLength []; |
| |
| static const int32_t kMinValues []; |
| static const int32_t kLeastMaxValues []; |
| static const int32_t kMaxValues []; |
| |
| // Useful millisecond constants |
| static const int32_t kOneSecond; |
| static const int32_t kOneMinute; |
| static const int32_t kOneHour; |
| static const double kOneDay; |
| static const double kOneWeek; |
| }; |
| |
| |
| inline uint8_t GregorianCalendar::julianDayToDayOfWeek(double julian) |
| { |
| // If julian is negative, then julian%7 will be negative, so we adjust |
| // accordingly. We add 1 because Julian day 0 is Monday. |
| int8_t dayOfWeek = (int8_t) icu_fmod(julian + 1, 7); |
| |
| uint8_t result = dayOfWeek + ((dayOfWeek < 0) ? (7 + SUNDAY) : SUNDAY); |
| return result; |
| } |
| |
| #endif // _GREGOCAL |
| //eof |
| |
