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443 lines
18 KiB
C++
443 lines
18 KiB
C++
/*
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********************************************************************************
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* *
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* COPYRIGHT: *
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* (C) Copyright Taligent, Inc., 1997 *
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* (C) Copyright International Business Machines Corporation, 1997 *
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* Licensed Material - Program-Property of IBM - All Rights Reserved. *
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* US Government Users Restricted Rights - Use, duplication, or disclosure *
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* restricted by GSA ADP Schedule Contract with IBM Corp. *
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* *
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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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********************************************************************************
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*/
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#ifndef _GREGOCAL
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#define _GREGOCAL
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#ifndef _CALENDAR
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#include "calendar.h"
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#endif
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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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#ifdef NLS_MAC
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#pragma export on
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#endif
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class T_FORMAT_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 ZERO_ERROR if constructed successfully.
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*/
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GregorianCalendar(ErrorCode& 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 ZERO_ERROR if constructed successfully.
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*/
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GregorianCalendar(TimeZone* zoneToAdopt, ErrorCode& 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 ZERO_ERROR if constructed successfully.
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*/
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GregorianCalendar(const TimeZone& zone, ErrorCode& 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 ZERO_ERROR if constructed successfully.
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*/
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GregorianCalendar(const Locale& aLocale, ErrorCode& 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 ZERO_ERROR if constructed successfully.
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*/
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GregorianCalendar(TimeZone* zoneToAdopt, const Locale& aLocale, ErrorCode& 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 ZERO_ERROR if constructed successfully.
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*/
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GregorianCalendar(const TimeZone& zone, const Locale& aLocale, ErrorCode& 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 ZERO_ERROR if constructed successfully.
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*/
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GregorianCalendar(t_int32 year, t_int32 month, t_int32 date, ErrorCode& 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 ZERO_ERROR if constructed successfully.
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*/
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GregorianCalendar(t_int32 year, t_int32 month, t_int32 date, t_int32 hour, t_int32 minute, ErrorCode& 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 ZERO_ERROR if constructed successfully.
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*/
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GregorianCalendar(t_int32 year, t_int32 month, t_int32 date, t_int32 hour, t_int32 minute, t_int32 second, ErrorCode& success);
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/**
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* Destructor
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*/
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virtual ~GregorianCalendar();
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/**
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* Copy constructor
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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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*/
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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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*/
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virtual Calendar* clone() 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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*/
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void setGregorianChange(Date date, ErrorCode& 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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*/
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Date getGregorianChange() 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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*/
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t_bool isLeapYear(t_int32 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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*/
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virtual t_bool 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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*/
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virtual t_bool equivalentTo(const Calendar& other) const;
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/**
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* (Overrides Calendar) Date 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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*/
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virtual void add(EDateFields field, t_int32 amount, ErrorCode& 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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*/
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virtual void roll(EDateFields field, int amount, ErrorCode& 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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*/
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virtual t_int32 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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*/
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virtual t_int32 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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*/
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virtual t_int32 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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*/
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virtual t_int32 getLeastMaximum(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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*/
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virtual t_bool inDaylightTime(ErrorCode& 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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*/
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virtual ClassID getDynamicClassID() const { return (ClassID)&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
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* value from getDynamicClassID(). For example:
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*
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* Base* polymorphic_pointer = createPolymorphicObject();
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* if (polymorphic_pointer->getDynamicClassID() ==
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* Derived::getStaticClassID()) ...
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*
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* @return The class ID for all objects of this class.
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*/
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static ClassID getStaticClassID() { return (ClassID)&fgClassID; }
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protected:
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/**
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* (Overrides Calendar) Converts GMT as milliseconds to time field values.
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*/
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virtual void computeFields(ErrorCode& status);
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/**
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* (Overrides Calendar) Converts Calendar's time field values to GMT as
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* milliseconds.
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*
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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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*/
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virtual void computeTime(ErrorCode& status);
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private:
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/**
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* Return the length of the given month in the given year, accounting for Gregorian
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* leap years.
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*/
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int monthLength(int month, int year) const;
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/**
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* Converts time as milliseconds to Julian date. The Julian date used here is not a
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* true Julian date, since it is measured from midnight, not noon.
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*
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* @param millis The given milliseconds.
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* @return The Julian date number.
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*/
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static long millisToJulianDay(Date millis);
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/**
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* Converts Julian date to time as milliseconds. The Julian date used here is not a
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* true Julian date, since it is measured from midnight, not noon.
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*
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* @param julian The given Julian date number.
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* @return Time as milliseconds.
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*/
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static Date julianDayToMillis(long julian);
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/**
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* Convert a quasi Julian date to the day of the week. The Julian date used here is
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* not a true Julian date, since it is measured from midnight, not noon. Return
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* value is one-based.
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*
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* @return Day number from 1..7 (SUN..SAT).
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*/
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static int julianDayToDayOfWeek(long julian);
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/**
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* Compute the date-based fields given the milliseconds since the epoch start. Do
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* not compute the time-based fields (HOUR, MINUTE, etc.).
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*
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* @param theTime The given time as LOCAL milliseconds, not UTC.
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*/
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void timeToFields(Date theTime, ErrorCode& status);
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/**
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* Return the week number of a day, within a period. This may be the week number in
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* a year, or the week number in a month. Usually this will be a value >= 1, but if
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* some initial days of the period are excluded from week 1, because
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* minimalDaysInFirstWeek is > 1, then the week number will be zero for those
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* initial days. Requires the day of week for the given date in order to determine
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* the day of week of the first day of the period.
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*
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* @param date Day-of-year or day-of-month. Should be 1 for first day of period.
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* @param day Day-of-week for given dayOfPeriod. 1-based with 1=Sunday.
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* @return Week number, one-based, or zero if the day falls in part of the
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* month before the first week, when there are days before the first
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* week because the minimum days in the first week is more than one.
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*/
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int weekNumber(int date, int day);
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/**
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* Validates the values of the set time fields. True if they're all valid.
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*/
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t_bool validateFields() const;
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/**
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* Validates the value of the given time field. True if it's valid.
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*/
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t_bool boundsCheck(t_int32 value, EDateFields field) const;
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// This is measured from the standard epoch, not in Julian Days.
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Date fGregorianCutover;
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static char fgClassID;
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static const Date kPapalCutover; // Cutover decreed by Pope Gregory
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static const Date kJulianOnset; // Onset of Julian calendar, 45 B.C.
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static const long kEpochStartAsJulianDay; // 1970-01-01 as Julian Day
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static const int kMonthLength[]; // lengths of months in non-leap year
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static const int kLeapMonthLength[]; // lengths of months in leap year
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static const int NUM_DAYS[]; // day-in-year numbers for the first of each month in non-leap years
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static const int LEAP_NUM_DAYS[]; // day-in-year numbers for the firstof each month in leap years
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static const Date EARLIEST_USABLE_MILLIS; // earliest Data value for which we can compute fields
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static const int EARLIEST_USABLE_YEAR; // earliest year for which we can compute dates and fields
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static const Date EARLIEST_INVALID_MILLIS; // earliest Date value for which we can't compute fields
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// (i.e., high bound of valid range)
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static const Date ONE_WEEK; // number of milliseconds in a week
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};
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#ifdef NLS_MAC
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#pragma export off
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#endif
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inline int GregorianCalendar::julianDayToDayOfWeek(long julian)
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{
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// If julian is negative, then julian%7 will be negative, so we adjust
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// accordingly. We add 1 because Julian day 0 is Monday.
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int dayOfWeek = (julian + 1) % 7;
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return dayOfWeek + ((dayOfWeek < 0) ? (7 + SUNDAY) : SUNDAY);
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}
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#endif // _GREGOCAL
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//eof
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