714 lines
30 KiB
C++
714 lines
30 KiB
C++
/*
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* Copyright (C) {1997-1999}, International Business Machines Corporation and others. All Rights Reserved.
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********************************************************************************
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*
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* File GREGOCAL.H
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*
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* Modification History:
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*
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* Date Name Description
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* 04/22/97 aliu Overhauled header.
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* 07/28/98 stephen Sync with JDK 1.2
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* 09/04/98 stephen Re-sync with JDK 8/31 putback
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* 09/14/98 stephen Changed type of kOneDay, kOneWeek to double.
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* Fixed bug in roll()
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* 10/15/99 aliu Fixed j31, incorrect WEEK_OF_YEAR computation.
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* Added documentation of WEEK_OF_YEAR computation.
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* 10/15/99 aliu Fixed j32, cannot set date to Feb 29 2000 AD.
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* {JDK bug 4210209 4209272}
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********************************************************************************
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*/
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#ifndef GREGOCAL_H
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#define GREGOCAL_H
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#include "unicode/calendar.h"
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/**
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* Concrete class which provides the standard calendar used by most of the world.
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* <P>
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* The standard (Gregorian) calendar has 2 eras, BC and AD.
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* <P>
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* This implementation handles a single discontinuity, which corresponds by default to
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* the date the Gregorian calendar was originally instituted (October 15, 1582). Not all
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* countries adopted the Gregorian calendar then, so this cutover date may be changed by
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* the caller.
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* <P>
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* Prior to the institution of the Gregorian Calendar, New Year's Day was March 25. To
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* avoid confusion, this Calendar always uses January 1. A manual adjustment may be made
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* if desired for dates that are prior to the Gregorian changeover and which fall
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* between January 1 and March 24.
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*
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* <p>Values calculated for the <code>WEEK_OF_YEAR</code> field range from 1 to
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* 53. Week 1 for a year is the first week that contains at least
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* <code>getMinimalDaysInFirstWeek()</code> days from that year. It thus
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* depends on the values of <code>getMinimalDaysInFirstWeek()</code>,
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* <code>getFirstDayOfWeek()</code>, and the day of the week of January 1.
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* Weeks between week 1 of one year and week 1 of the following year are
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* numbered sequentially from 2 to 52 or 53 (as needed).
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*
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* <p>For example, January 1, 1998 was a Thursday. If
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* <code>getFirstDayOfWeek()</code> is <code>MONDAY</code> and
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* <code>getMinimalDaysInFirstWeek()</code> is 4 (these are the values
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* reflecting ISO 8601 and many national standards), then week 1 of 1998 starts
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* on December 29, 1997, and ends on January 4, 1998. If, however,
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* <code>getFirstDayOfWeek()</code> is <code>SUNDAY</code>, then week 1 of 1998
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* starts on January 4, 1998, and ends on January 10, 1998; the first three days
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* of 1998 then are part of week 53 of 1997.
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*
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* <p>Example for using GregorianCalendar:
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* <pre>
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* \code
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* // get the supported ids for GMT-08:00 (Pacific Standard Time)
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* int32_t idsCount;
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* const UnicodeString** ids = TimeZone::createAvailableIDs(-8 * 60 * 60 * 1000, idsCount);
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* // if no ids were returned, something is wrong. get out.
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* if (idsCount == 0) {
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* return;
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* }
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*
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* // begin output
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* cout << "Current Time" << endl;
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*
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* // create a Pacific Standard Time time zone
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* SimpleTimeZone* pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, *(ids[0]));
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*
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* // set up rules for daylight savings time
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* pdt->setStartRule(Calendar::APRIL, 1, Calendar::SUNDAY, 2 * 60 * 60 * 1000);
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* pdt->setEndRule(Calendar::OCTOBER, -1, Calendar::SUNDAY, 2 * 60 * 60 * 1000);
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*
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* // create a GregorianCalendar with the Pacific Daylight time zone
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* // and the current date and time
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* UErrorCode success = U_ZERO_ERROR;
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* Calendar* calendar = new GregorianCalendar( pdt, success );
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*
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* // print out a bunch of interesting things
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* cout << "ERA: " << calendar->get( Calendar::ERA, success ) << endl;
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* cout << "YEAR: " << calendar->get( Calendar::YEAR, success ) << endl;
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* cout << "MONTH: " << calendar->get( Calendar::MONTH, success ) << endl;
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* cout << "WEEK_OF_YEAR: " << calendar->get( Calendar::WEEK_OF_YEAR, success ) << endl;
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* cout << "WEEK_OF_MONTH: " << calendar->get( Calendar::WEEK_OF_MONTH, success ) << endl;
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* cout << "DATE: " << calendar->get( Calendar::DATE, success ) << endl;
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* cout << "DAY_OF_MONTH: " << calendar->get( Calendar::DAY_OF_MONTH, success ) << endl;
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* cout << "DAY_OF_YEAR: " << calendar->get( Calendar::DAY_OF_YEAR, success ) << endl;
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* cout << "DAY_OF_WEEK: " << calendar->get( Calendar::DAY_OF_WEEK, success ) << endl;
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* cout << "DAY_OF_WEEK_IN_MONTH: " << calendar->get( Calendar::DAY_OF_WEEK_IN_MONTH, success ) << endl;
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* cout << "AM_PM: " << calendar->get( Calendar::AM_PM, success ) << endl;
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* cout << "HOUR: " << calendar->get( Calendar::HOUR, success ) << endl;
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* cout << "HOUR_OF_DAY: " << calendar->get( Calendar::HOUR_OF_DAY, success ) << endl;
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* cout << "MINUTE: " << calendar->get( Calendar::MINUTE, success ) << endl;
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* cout << "SECOND: " << calendar->get( Calendar::SECOND, success ) << endl;
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* cout << "MILLISECOND: " << calendar->get( Calendar::MILLISECOND, success ) << endl;
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* cout << "ZONE_OFFSET: " << (calendar->get( Calendar::ZONE_OFFSET, success )/(60*60*1000)) << endl;
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* cout << "DST_OFFSET: " << (calendar->get( Calendar::DST_OFFSET, success )/(60*60*1000)) << endl;
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*
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* cout << "Current Time, with hour reset to 3" << endl;
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* calendar->clear(Calendar::HOUR_OF_DAY); // so doesn't override
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* calendar->set(Calendar::HOUR, 3);
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* cout << "ERA: " << calendar->get( Calendar::ERA, success ) << endl;
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* cout << "YEAR: " << calendar->get( Calendar::YEAR, success ) << endl;
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* cout << "MONTH: " << calendar->get( Calendar::MONTH, success ) << endl;
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* cout << "WEEK_OF_YEAR: " << calendar->get( Calendar::WEEK_OF_YEAR, success ) << endl;
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* cout << "WEEK_OF_MONTH: " << calendar->get( Calendar::WEEK_OF_MONTH, success ) << endl;
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* cout << "DATE: " << calendar->get( Calendar::DATE, success ) << endl;
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* cout << "DAY_OF_MONTH: " << calendar->get( Calendar::DAY_OF_MONTH, success ) << endl;
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* cout << "DAY_OF_YEAR: " << calendar->get( Calendar::DAY_OF_YEAR, success ) << endl;
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* cout << "DAY_OF_WEEK: " << calendar->get( Calendar::DAY_OF_WEEK, success ) << endl;
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* cout << "DAY_OF_WEEK_IN_MONTH: " << calendar->get( Calendar::DAY_OF_WEEK_IN_MONTH, success ) << endl;
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* cout << "AM_PM: " << calendar->get( Calendar::AM_PM, success ) << endl;
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* cout << "HOUR: " << calendar->get( Calendar::HOUR, success ) << endl;
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* cout << "HOUR_OF_DAY: " << calendar->get( Calendar::HOUR_OF_DAY, success ) << endl;
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* cout << "MINUTE: " << calendar->get( Calendar::MINUTE, success ) << endl;
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* cout << "SECOND: " << calendar->get( Calendar::SECOND, success ) << endl;
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* cout << "MILLISECOND: " << calendar->get( Calendar::MILLISECOND, success ) << endl;
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* cout << "ZONE_OFFSET: " << (calendar->get( Calendar::ZONE_OFFSET, success )/(60*60*1000)) << endl; // in hours
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* cout << "DST_OFFSET: " << (calendar->get( Calendar::DST_OFFSET, success )/(60*60*1000)) << endl; // in hours
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*
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* delete[] ids;
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* delete calendar; // also deletes pdt
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* \endcode
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* </pre>
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*/
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class U_I18N_API GregorianCalendar: public Calendar {
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public:
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/**
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* Useful constants for GregorianCalendar and TimeZone.
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*/
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enum EEras {
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BC,
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AD
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};
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/**
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* Constructs a default GregorianCalendar using the current time in the default time
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* zone with the default locale.
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*
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* @param success Indicates the status of GregorianCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @stable
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*/
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GregorianCalendar(UErrorCode& success);
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/**
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* Constructs a GregorianCalendar based on the current time in the given time zone
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* with the default locale. Clients are no longer responsible for deleting the given
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* time zone object after it's adopted.
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*
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* @param zoneToAdopt The given timezone.
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* @param success Indicates the status of GregorianCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @stable
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*/
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GregorianCalendar(TimeZone* zoneToAdopt, UErrorCode& success);
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/**
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* Constructs a GregorianCalendar based on the current time in the given time zone
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* with the default locale.
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*
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* @param zone The given timezone.
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* @param success Indicates the status of GregorianCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @stable
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*/
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GregorianCalendar(const TimeZone& zone, UErrorCode& success);
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/**
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* Constructs a GregorianCalendar based on the current time in the default time zone
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* with the given locale.
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*
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* @param aLocale The given locale.
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* @param success Indicates the status of GregorianCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @stable
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*/
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GregorianCalendar(const Locale& aLocale, UErrorCode& success);
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/**
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* Constructs a GregorianCalendar based on the current time in the given time zone
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* with the given locale. Clients are no longer responsible for deleting the given
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* time zone object after it's adopted.
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*
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* @param zoneToAdopt The given timezone.
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* @param aLocale The given locale.
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* @param success Indicates the status of GregorianCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @stable
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*/
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GregorianCalendar(TimeZone* zoneToAdopt, const Locale& aLocale, UErrorCode& success);
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/**
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* Constructs a GregorianCalendar based on the current time in the given time zone
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* with the given locale.
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*
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* @param zone The given timezone.
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* @param aLocale The given locale.
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* @param success Indicates the status of GregorianCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @stable
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*/
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GregorianCalendar(const TimeZone& zone, const Locale& aLocale, UErrorCode& success);
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/**
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* Constructs a GregorianCalendar with the given AD date set in the default time
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* zone with the default locale.
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*
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* @param year The value used to set the YEAR time field in the calendar.
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* @param month The value used to set the MONTH time field in the calendar. Month
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* value is 0-based. e.g., 0 for January.
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* @param date The value used to set the DATE time field in the calendar.
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* @param success Indicates the status of GregorianCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @stable
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*/
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GregorianCalendar(int32_t year, int32_t month, int32_t date, UErrorCode& success);
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/**
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* Constructs a GregorianCalendar with the given AD date and time set for the
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* default time zone with the default locale.
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*
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* @param year The value used to set the YEAR time field in the calendar.
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* @param month The value used to set the MONTH time field in the calendar. Month
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* value is 0-based. e.g., 0 for January.
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* @param date The value used to set the DATE time field in the calendar.
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* @param hour The value used to set the HOUR_OF_DAY time field in the calendar.
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* @param minute The value used to set the MINUTE time field in the calendar.
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* @param success Indicates the status of GregorianCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @stable
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*/
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GregorianCalendar(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, UErrorCode& success);
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/**
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* Constructs a GregorianCalendar with the given AD date and time set for the
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* default time zone with the default locale.
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*
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* @param year The value used to set the YEAR time field in the calendar.
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* @param month The value used to set the MONTH time field in the calendar. Month
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* value is 0-based. e.g., 0 for January.
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* @param date The value used to set the DATE time field in the calendar.
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* @param hour The value used to set the HOUR_OF_DAY time field in the calendar.
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* @param minute The value used to set the MINUTE time field in the calendar.
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* @param second The value used to set the SECOND time field in the calendar.
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* @param success Indicates the status of GregorianCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @stable
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*/
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GregorianCalendar(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, int32_t second, UErrorCode& success);
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/**
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* Destructor
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* @stable
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*/
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virtual ~GregorianCalendar();
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/**
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* Copy constructor
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* @stable
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*/
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GregorianCalendar(const GregorianCalendar& source);
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/**
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* Default assignment operator
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* @stable
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*/
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GregorianCalendar& operator=(const GregorianCalendar& right);
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/**
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* Create and return a polymorphic copy of this calendar.
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* @stable
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*/
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virtual Calendar* clone(void) const;
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/**
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* Sets the GregorianCalendar change date. This is the point when the switch from
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* Julian dates to Gregorian dates occurred. Default is 00:00:00 local time, October
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* 15, 1582. Previous to this time and date will be Julian dates.
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*
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* @param date The given Gregorian cutover date.
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* @param success Output param set to success/failure code on exit.
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* @stable
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*/
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void setGregorianChange(UDate date, UErrorCode& success);
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/**
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* Gets the Gregorian Calendar change date. This is the point when the switch from
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* Julian dates to Gregorian dates occurred. Default is 00:00:00 local time, October
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* 15, 1582. Previous to this time and date will be Julian dates.
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*
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* @return The Gregorian cutover time for this calendar.
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* @stable
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*/
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UDate getGregorianChange(void) const;
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/**
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* Return true if the given year is a leap year. Determination of whether a year is
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* a leap year is actually very complicated. We do something crude and mostly
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* correct here, but for a real determination you need a lot of contextual
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* information. For example, in Sweden, the change from Julian to Gregorian happened
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* in a complex way resulting in missed leap years and double leap years between
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* 1700 and 1753. Another example is that after the start of the Julian calendar in
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* 45 B.C., the leap years did not regularize until 8 A.D. This method ignores these
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* quirks, and pays attention only to the Julian onset date and the Gregorian
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* cutover (which can be changed).
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*
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* @param year The given year.
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* @return True if the given year is a leap year; false otherwise.
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* @stable
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*/
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UBool isLeapYear(int32_t year) const;
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/**
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* Compares the equality of two GregorianCalendar objects. Objects of different
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* subclasses are considered unequal. This is a strict equality test; see the
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* documentation for Calendar::operator==().
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*
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* @param that The GregorianCalendar object to be compared with.
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* @return True if the given GregorianCalendar is the same as this
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* GregorianCalendar; false otherwise.
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* @stable
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*/
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virtual UBool operator==(const Calendar& that) const;
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/**
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* Calendar override.
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* Return true if another Calendar object is equivalent to this one. An equivalent
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* Calendar will behave exactly as this one does, but may be set to a different time.
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* @stable
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*/
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virtual UBool equivalentTo(const Calendar& other) const;
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/**
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* (Overrides Calendar) UDate Arithmetic function. Adds the specified (signed) amount
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* of time to the given time field, based on the calendar's rules. For more
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* information, see the documentation for Calendar::add().
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*
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* @param field The time field.
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* @param amount The amount of date or time to be added to the field.
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* @param status Output param set to success/failure code on exit. If any value
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* previously set in the time field is invalid, this will be set to
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* an error status.
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* @stable
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*/
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virtual void add(EDateFields field, int32_t amount, UErrorCode& status);
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/**
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* (Overrides Calendar) Rolls up or down by the given amount in the specified field.
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* For more information, see the documentation for Calendar::roll().
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*
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* @param field The time field.
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* @param amount Indicates amount to roll.
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* @param status Output param set to success/failure code on exit. If any value
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* previously set in the time field is invalid, this will be set to
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* an error status.
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* @stable
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*/
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virtual void roll(EDateFields field, int32_t amount, UErrorCode& status);
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/**
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* (Overrides Calendar) Returns minimum value for the given field. e.g. for
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* Gregorian DAY_OF_MONTH, 1.
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* @stable
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*/
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virtual int32_t getMinimum(EDateFields field) const;
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/**
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* (Overrides Calendar) Returns maximum value for the given field. e.g. for
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* Gregorian DAY_OF_MONTH, 31.
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* @stable
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*/
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virtual int32_t getMaximum(EDateFields field) const;
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/**
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* (Overrides Calendar) Returns highest minimum value for the given field if varies.
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* Otherwise same as getMinimum(). For Gregorian, no difference.
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* @stable
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*/
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virtual int32_t getGreatestMinimum(EDateFields field) const;
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/**
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* (Overrides Calendar) Returns lowest maximum value for the given field if varies.
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* Otherwise same as getMaximum(). For Gregorian DAY_OF_MONTH, 28.
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* @stable
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*/
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virtual int32_t getLeastMaximum(EDateFields field) const;
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/**
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* Return the minimum value that this field could have, given the current date.
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* For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum().
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* @stable
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*/
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int32_t getActualMinimum(EDateFields field) const;
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/**
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* Return the maximum value that this field could have, given the current date.
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* For example, with the date "Feb 3, 1997" and the DAY_OF_MONTH field, the actual
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* maximum would be 28; for "Feb 3, 1996" it s 29. Similarly for a Hebrew calendar,
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* for some years the actual maximum for MONTH is 12, and for others 13.
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* @stable
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*/
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int32_t getActualMaximum(EDateFields field) const;
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/**
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* (Overrides Calendar) Return true if the current date for this Calendar is in
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* Daylight Savings Time. Recognizes DST_OFFSET, if it is set.
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*
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* @param status Fill-in parameter which receives the status of this operation.
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* @return True if the current date for this Calendar is in Daylight Savings Time,
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* false, otherwise.
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* @stable
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*/
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virtual UBool inDaylightTime(UErrorCode& status) const;
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public:
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/**
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* Override Calendar Returns a unique class ID POLYMORPHICALLY. Pure virtual
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* override. This method is to implement a simple version of RTTI, since not all C++
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* compilers support genuine RTTI. Polymorphic operator==() and clone() methods call
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* this method.
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*
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* @return The class ID for this object. All objects of a given class have the
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* same class ID. Objects of other classes have different class IDs.
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* @stable
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*/
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virtual UClassID getDynamicClassID(void) const { return (UClassID)&fgClassID; }
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/**
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* 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.
|
|
* @stable
|
|
*/
|
|
static UClassID getStaticClassID(void) { return (UClassID)&fgClassID; }
|
|
|
|
protected:
|
|
|
|
/**
|
|
* (Overrides Calendar) Converts GMT as milliseconds to time field values.
|
|
* @stable
|
|
*/
|
|
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.
|
|
* @stable
|
|
*/
|
|
virtual void computeTime(UErrorCode& status);
|
|
|
|
private:
|
|
|
|
/**
|
|
* Return the ERA. We need a special method for this because the
|
|
* default ERA is AD, but a zero (unset) ERA is BC.
|
|
*/
|
|
int32_t internalGetEra() const;
|
|
|
|
// 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);
|
|
|
|
static double computeJulianDayOfYear(UBool isGregorian, int32_t year,
|
|
UBool& isLeap);
|
|
|
|
int32_t computeRelativeDOW() const;
|
|
|
|
int32_t computeRelativeDOW(double julianDay) const;
|
|
|
|
int32_t computeDOYfromWOY(double julianDayOfYear) const;
|
|
|
|
/**
|
|
* 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(UBool 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, UBool 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.
|
|
*/
|
|
UBool validateFields(void) const;
|
|
|
|
/**
|
|
* Validates the value of the given time field. True if it's valid.
|
|
*/
|
|
UBool 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.
|
|
*/
|
|
int32_t aggregateStamp(int32_t stamp_a, int32_t 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) uprv_fmod(julian + 1, 7);
|
|
|
|
uint8_t result = (uint8_t)(dayOfWeek + ((dayOfWeek < 0) ? (7 + SUNDAY) : SUNDAY));
|
|
return result;
|
|
}
|
|
|
|
#endif // _GREGOCAL
|
|
//eof
|
|
|