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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 1997-2016, International Business Machines Corporation and
+* others. All Rights Reserved.
+*******************************************************************************
+*
+* File GREGOCAL.CPP
+*
+* Modification History:
+*
+* Date Name Description
+* 02/05/97 clhuang Creation.
+* 03/28/97 aliu Made highly questionable fix to computeFields to
+* handle DST correctly.
+* 04/22/97 aliu Cleaned up code drastically. Added monthLength().
+* Finished unimplemented parts of computeTime() for
+* week-based date determination. Removed quetionable
+* fix and wrote correct fix for computeFields() and
+* daylight time handling. Rewrote inDaylightTime()
+* and computeFields() to handle sensitive Daylight to
+* Standard time transitions correctly.
+* 05/08/97 aliu Added code review changes. Fixed isLeapYear() to
+* not cutover.
+* 08/12/97 aliu Added equivalentTo. Misc other fixes. Updated
+* add() from Java source.
+* 07/28/98 stephen Sync up with JDK 1.2
+* 09/14/98 stephen Changed type of kOneDay, kOneWeek to double.
+* Fixed bug in roll()
+* 10/15/99 aliu Fixed j31, incorrect WEEK_OF_YEAR computation.
+* 10/15/99 aliu Fixed j32, cannot set date to Feb 29 2000 AD.
+* {JDK bug 4210209 4209272}
+* 11/15/99 weiv Added YEAR_WOY and DOW_LOCAL computation
+* to timeToFields method, updated kMinValues, kMaxValues & kLeastMaxValues
+* 12/09/99 aliu Fixed j81, calculation errors and roll bugs
+* in year of cutover.
+* 01/24/2000 aliu Revised computeJulianDay for YEAR YEAR_WOY WOY.
+********************************************************************************
+*/
+
+#include "unicode/utypes.h"
+#include <float.h>
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/gregocal.h"
+#include "gregoimp.h"
+#include "umutex.h"
+#include "uassert.h"
+
+// *****************************************************************************
+// class GregorianCalendar
+// *****************************************************************************
+
+/**
+* Note that the Julian date used here is not a true Julian date, since
+* it is measured from midnight, not noon. This value is the Julian
+* day number of January 1, 1970 (Gregorian calendar) at noon UTC. [LIU]
+*/
+
+static const int16_t kNumDays[]
+= {0,31,59,90,120,151,181,212,243,273,304,334}; // 0-based, for day-in-year
+static const int16_t kLeapNumDays[]
+= {0,31,60,91,121,152,182,213,244,274,305,335}; // 0-based, for day-in-year
+static const int8_t kMonthLength[]
+= {31,28,31,30,31,30,31,31,30,31,30,31}; // 0-based
+static const int8_t kLeapMonthLength[]
+= {31,29,31,30,31,30,31,31,30,31,30,31}; // 0-based
+
+// setTimeInMillis() limits the Julian day range to +/-7F000000.
+// This would seem to limit the year range to:
+// ms=+183882168921600000 jd=7f000000 December 20, 5828963 AD
+// ms=-184303902528000000 jd=81000000 September 20, 5838270 BC
+// HOWEVER, CalendarRegressionTest/Test4167060 shows that the actual
+// range limit on the year field is smaller (~ +/-140000). [alan 3.0]
+
+static const int32_t kGregorianCalendarLimits[UCAL_FIELD_COUNT][4] = {
+ // Minimum Greatest Least Maximum
+ // Minimum Maximum
+ { 0, 0, 1, 1}, // ERA
+ { 1, 1, 140742, 144683}, // YEAR
+ { 0, 0, 11, 11}, // MONTH
+ { 1, 1, 52, 53}, // WEEK_OF_YEAR
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
+ { 1, 1, 28, 31}, // DAY_OF_MONTH
+ { 1, 1, 365, 366}, // DAY_OF_YEAR
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
+ { -1, -1, 4, 5}, // DAY_OF_WEEK_IN_MONTH
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
+ { -140742, -140742, 140742, 144683}, // YEAR_WOY
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
+ { -140742, -140742, 140742, 144683}, // EXTENDED_YEAR
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
+ {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
+ { 0, 0, 11, 11}, // ORDINAL_MONTH
+};
+
+/*
+* <pre>
+* Greatest Least
+* Field name Minimum Minimum Maximum Maximum
+* ---------- ------- ------- ------- -------
+* ERA 0 0 1 1
+* YEAR 1 1 140742 144683
+* MONTH 0 0 11 11
+* WEEK_OF_YEAR 1 1 52 53
+* WEEK_OF_MONTH 0 0 4 6
+* DAY_OF_MONTH 1 1 28 31
+* DAY_OF_YEAR 1 1 365 366
+* DAY_OF_WEEK 1 1 7 7
+* DAY_OF_WEEK_IN_MONTH -1 -1 4 5
+* AM_PM 0 0 1 1
+* HOUR 0 0 11 11
+* HOUR_OF_DAY 0 0 23 23
+* MINUTE 0 0 59 59
+* SECOND 0 0 59 59
+* MILLISECOND 0 0 999 999
+* ZONE_OFFSET -12* -12* 12* 12*
+* DST_OFFSET 0 0 1* 1*
+* YEAR_WOY 1 1 140742 144683
+* DOW_LOCAL 1 1 7 7
+* </pre>
+* (*) In units of one-hour
+*/
+
+#if defined( U_DEBUG_CALSVC ) || defined (U_DEBUG_CAL)
+#include <stdio.h>
+#endif
+
+U_NAMESPACE_BEGIN
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(GregorianCalendar)
+
+// 00:00:00 UTC, October 15, 1582, expressed in ms from the epoch.
+// Note that only Italy and other Catholic countries actually
+// observed this cutover. Most other countries followed in
+// the next few centuries, some as late as 1928. [LIU]
+// in Java, -12219292800000L
+//const UDate GregorianCalendar::kPapalCutover = -12219292800000L;
+static const uint32_t kCutoverJulianDay = 2299161;
+static const UDate kPapalCutover = (2299161.0 - kEpochStartAsJulianDay) * U_MILLIS_PER_DAY;
+//static const UDate kPapalCutoverJulian = (2299161.0 - kEpochStartAsJulianDay);
+
+// -------------------------------------
+
+GregorianCalendar::GregorianCalendar(UErrorCode& status)
+: Calendar(status),
+fGregorianCutover(kPapalCutover),
+fCutoverJulianDay(kCutoverJulianDay), fNormalizedGregorianCutover(fGregorianCutover), fGregorianCutoverYear(1582),
+fIsGregorian(true), fInvertGregorian(false)
+{
+ setTimeInMillis(getNow(), status);
+}
+
+// -------------------------------------
+
+GregorianCalendar::GregorianCalendar(TimeZone* zone, UErrorCode& status)
+: Calendar(zone, Locale::getDefault(), status),
+fGregorianCutover(kPapalCutover),
+fCutoverJulianDay(kCutoverJulianDay), fNormalizedGregorianCutover(fGregorianCutover), fGregorianCutoverYear(1582),
+fIsGregorian(true), fInvertGregorian(false)
+{
+ setTimeInMillis(getNow(), status);
+}
+
+// -------------------------------------
+
+GregorianCalendar::GregorianCalendar(const TimeZone& zone, UErrorCode& status)
+: Calendar(zone, Locale::getDefault(), status),
+fGregorianCutover(kPapalCutover),
+fCutoverJulianDay(kCutoverJulianDay), fNormalizedGregorianCutover(fGregorianCutover), fGregorianCutoverYear(1582),
+fIsGregorian(true), fInvertGregorian(false)
+{
+ setTimeInMillis(getNow(), status);
+}
+
+// -------------------------------------
+
+GregorianCalendar::GregorianCalendar(const Locale& aLocale, UErrorCode& status)
+: Calendar(TimeZone::forLocaleOrDefault(aLocale), aLocale, status),
+fGregorianCutover(kPapalCutover),
+fCutoverJulianDay(kCutoverJulianDay), fNormalizedGregorianCutover(fGregorianCutover), fGregorianCutoverYear(1582),
+fIsGregorian(true), fInvertGregorian(false)
+{
+ setTimeInMillis(getNow(), status);
+}
+
+// -------------------------------------
+
+GregorianCalendar::GregorianCalendar(TimeZone* zone, const Locale& aLocale,
+ UErrorCode& status)
+ : Calendar(zone, aLocale, status),
+ fGregorianCutover(kPapalCutover),
+ fCutoverJulianDay(kCutoverJulianDay), fNormalizedGregorianCutover(fGregorianCutover), fGregorianCutoverYear(1582),
+ fIsGregorian(true), fInvertGregorian(false)
+{
+ setTimeInMillis(getNow(), status);
+}
+
+// -------------------------------------
+
+GregorianCalendar::GregorianCalendar(const TimeZone& zone, const Locale& aLocale,
+ UErrorCode& status)
+ : Calendar(zone, aLocale, status),
+ fGregorianCutover(kPapalCutover),
+ fCutoverJulianDay(kCutoverJulianDay), fNormalizedGregorianCutover(fGregorianCutover), fGregorianCutoverYear(1582),
+ fIsGregorian(true), fInvertGregorian(false)
+{
+ setTimeInMillis(getNow(), status);
+}
+
+// -------------------------------------
+
+GregorianCalendar::GregorianCalendar(int32_t year, int32_t month, int32_t date,
+ UErrorCode& status)
+ : Calendar(TimeZone::createDefault(), Locale::getDefault(), status),
+ fGregorianCutover(kPapalCutover),
+ fCutoverJulianDay(kCutoverJulianDay), fNormalizedGregorianCutover(fGregorianCutover), fGregorianCutoverYear(1582),
+ fIsGregorian(true), fInvertGregorian(false)
+{
+ set(UCAL_ERA, AD);
+ set(UCAL_YEAR, year);
+ set(UCAL_MONTH, month);
+ set(UCAL_DATE, date);
+}
+
+// -------------------------------------
+
+GregorianCalendar::GregorianCalendar(int32_t year, int32_t month, int32_t date,
+ int32_t hour, int32_t minute, UErrorCode& status)
+ : Calendar(TimeZone::createDefault(), Locale::getDefault(), status),
+ fGregorianCutover(kPapalCutover),
+ fCutoverJulianDay(kCutoverJulianDay), fNormalizedGregorianCutover(fGregorianCutover), fGregorianCutoverYear(1582),
+ fIsGregorian(true), fInvertGregorian(false)
+{
+ set(UCAL_ERA, AD);
+ set(UCAL_YEAR, year);
+ set(UCAL_MONTH, month);
+ set(UCAL_DATE, date);
+ set(UCAL_HOUR_OF_DAY, hour);
+ set(UCAL_MINUTE, minute);
+}
+
+// -------------------------------------
+
+GregorianCalendar::GregorianCalendar(int32_t year, int32_t month, int32_t date,
+ int32_t hour, int32_t minute, int32_t second,
+ UErrorCode& status)
+ : Calendar(TimeZone::createDefault(), Locale::getDefault(), status),
+ fGregorianCutover(kPapalCutover),
+ fCutoverJulianDay(kCutoverJulianDay), fNormalizedGregorianCutover(fGregorianCutover), fGregorianCutoverYear(1582),
+ fIsGregorian(true), fInvertGregorian(false)
+{
+ set(UCAL_ERA, AD);
+ set(UCAL_YEAR, year);
+ set(UCAL_MONTH, month);
+ set(UCAL_DATE, date);
+ set(UCAL_HOUR_OF_DAY, hour);
+ set(UCAL_MINUTE, minute);
+ set(UCAL_SECOND, second);
+}
+
+// -------------------------------------
+
+GregorianCalendar::~GregorianCalendar()
+{
+}
+
+// -------------------------------------
+
+GregorianCalendar::GregorianCalendar(const GregorianCalendar &source)
+: Calendar(source),
+fGregorianCutover(source.fGregorianCutover),
+fCutoverJulianDay(source.fCutoverJulianDay), fNormalizedGregorianCutover(source.fNormalizedGregorianCutover), fGregorianCutoverYear(source.fGregorianCutoverYear),
+fIsGregorian(source.fIsGregorian), fInvertGregorian(source.fInvertGregorian)
+{
+}
+
+// -------------------------------------
+
+GregorianCalendar* GregorianCalendar::clone() const
+{
+ return new GregorianCalendar(*this);
+}
+
+// -------------------------------------
+
+GregorianCalendar &
+GregorianCalendar::operator=(const GregorianCalendar &right)
+{
+ if (this != &right)
+ {
+ Calendar::operator=(right);
+ fGregorianCutover = right.fGregorianCutover;
+ fNormalizedGregorianCutover = right.fNormalizedGregorianCutover;
+ fGregorianCutoverYear = right.fGregorianCutoverYear;
+ fCutoverJulianDay = right.fCutoverJulianDay;
+ }
+ return *this;
+}
+
+// -------------------------------------
+
+UBool GregorianCalendar::isEquivalentTo(const Calendar& other) const
+{
+ // Calendar override.
+ return Calendar::isEquivalentTo(other) &&
+ fGregorianCutover == ((GregorianCalendar*)&other)->fGregorianCutover;
+}
+
+// -------------------------------------
+
+void
+GregorianCalendar::setGregorianChange(UDate date, UErrorCode& status)
+{
+ if (U_FAILURE(status))
+ return;
+
+ // Precompute two internal variables which we use to do the actual
+ // cutover computations. These are the normalized cutover, which is the
+ // midnight at or before the cutover, and the cutover year. The
+ // normalized cutover is in pure date milliseconds; it contains no time
+ // of day or timezone component, and it used to compare against other
+ // pure date values.
+ double cutoverDay = ClockMath::floorDivide(date, (double)kOneDay);
+
+ // Handle the rare case of numeric overflow where the user specifies a time
+ // outside of INT32_MIN .. INT32_MAX number of days.
+
+ if (cutoverDay <= INT32_MIN) {
+ cutoverDay = INT32_MIN;
+ fGregorianCutover = fNormalizedGregorianCutover = cutoverDay * kOneDay;
+ } else if (cutoverDay >= INT32_MAX) {
+ cutoverDay = INT32_MAX;
+ fGregorianCutover = fNormalizedGregorianCutover = cutoverDay * kOneDay;
+ } else {
+ fNormalizedGregorianCutover = cutoverDay * kOneDay;
+ fGregorianCutover = date;
+ }
+
+ // Normalize the year so BC values are represented as 0 and negative
+ // values.
+ GregorianCalendar *cal = new GregorianCalendar(getTimeZone(), status);
+ /* test for nullptr */
+ if (cal == 0) {
+ status = U_MEMORY_ALLOCATION_ERROR;
+ return;
+ }
+ if(U_FAILURE(status))
+ return;
+ cal->setTime(date, status);
+ fGregorianCutoverYear = cal->get(UCAL_YEAR, status);
+ if (cal->get(UCAL_ERA, status) == BC)
+ fGregorianCutoverYear = 1 - fGregorianCutoverYear;
+ fCutoverJulianDay = (int32_t)cutoverDay;
+ delete cal;
+}
+
+
+void GregorianCalendar::handleComputeFields(int32_t julianDay, UErrorCode& status) {
+ int32_t eyear, month, dayOfMonth, dayOfYear, unusedRemainder;
+
+
+ if(U_FAILURE(status)) {
+ return;
+ }
+
+#if defined (U_DEBUG_CAL)
+ fprintf(stderr, "%s:%d: jd%d- (greg's %d)- [cut=%d]\n",
+ __FILE__, __LINE__, julianDay, getGregorianDayOfYear(), fCutoverJulianDay);
+#endif
+
+
+ if (julianDay >= fCutoverJulianDay) {
+ month = getGregorianMonth();
+ dayOfMonth = getGregorianDayOfMonth();
+ dayOfYear = getGregorianDayOfYear();
+ eyear = getGregorianYear();
+ } else {
+ // The Julian epoch day (not the same as Julian Day)
+ // is zero on Saturday December 30, 0 (Gregorian).
+ int32_t julianEpochDay = julianDay - (kJan1_1JulianDay - 2);
+ eyear = (int32_t) ClockMath::floorDivide((4.0*julianEpochDay) + 1464.0, (int32_t) 1461, &unusedRemainder);
+
+ // Compute the Julian calendar day number for January 1, eyear
+ int32_t january1 = 365*(eyear-1) + ClockMath::floorDivide(eyear-1, (int32_t)4);
+ dayOfYear = (julianEpochDay - january1); // 0-based
+
+ // Julian leap years occurred historically every 4 years starting
+ // with 8 AD. Before 8 AD the spacing is irregular; every 3 years
+ // from 45 BC to 9 BC, and then none until 8 AD. However, we don't
+ // implement this historical detail; instead, we implement the
+ // computationally cleaner proleptic calendar, which assumes
+ // consistent 4-year cycles throughout time.
+ UBool isLeap = ((eyear&0x3) == 0); // equiv. to (eyear%4 == 0)
+
+ // Common Julian/Gregorian calculation
+ int32_t correction = 0;
+ int32_t march1 = isLeap ? 60 : 59; // zero-based DOY for March 1
+ if (dayOfYear >= march1) {
+ correction = isLeap ? 1 : 2;
+ }
+ month = (12 * (dayOfYear + correction) + 6) / 367; // zero-based month
+ dayOfMonth = dayOfYear - (isLeap?kLeapNumDays[month]:kNumDays[month]) + 1; // one-based DOM
+ ++dayOfYear;
+#if defined (U_DEBUG_CAL)
+ // fprintf(stderr, "%d - %d[%d] + 1\n", dayOfYear, isLeap?kLeapNumDays[month]:kNumDays[month], month );
+ // fprintf(stderr, "%s:%d: greg's HCF %d -> %d/%d/%d not %d/%d/%d\n",
+ // __FILE__, __LINE__,julianDay,
+ // eyear,month,dayOfMonth,
+ // getGregorianYear(), getGregorianMonth(), getGregorianDayOfMonth() );
+ fprintf(stderr, "%s:%d: doy %d (greg's %d)- [cut=%d]\n",
+ __FILE__, __LINE__, dayOfYear, getGregorianDayOfYear(), fCutoverJulianDay);
+#endif
+
+ }
+
+ // [j81] if we are after the cutover in its year, shift the day of the year
+ if((eyear == fGregorianCutoverYear) && (julianDay >= fCutoverJulianDay)) {
+ //from handleComputeMonthStart
+ int32_t gregShift = Grego::gregorianShift(eyear);
+#if defined (U_DEBUG_CAL)
+ fprintf(stderr, "%s:%d: gregorian shift %d ::: doy%d => %d [cut=%d]\n",
+ __FILE__, __LINE__,gregShift, dayOfYear, dayOfYear+gregShift, fCutoverJulianDay);
+#endif
+ dayOfYear += gregShift;
+ }
+
+ internalSet(UCAL_MONTH, month);
+ internalSet(UCAL_ORDINAL_MONTH, month);
+ internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
+ internalSet(UCAL_DAY_OF_YEAR, dayOfYear);
+ internalSet(UCAL_EXTENDED_YEAR, eyear);
+ int32_t era = AD;
+ if (eyear < 1) {
+ era = BC;
+ eyear = 1 - eyear;
+ }
+ internalSet(UCAL_ERA, era);
+ internalSet(UCAL_YEAR, eyear);
+}
+
+
+// -------------------------------------
+
+UDate
+GregorianCalendar::getGregorianChange() const
+{
+ return fGregorianCutover;
+}
+
+// -------------------------------------
+
+UBool
+GregorianCalendar::isLeapYear(int32_t year) const
+{
+ // MSVC complains bitterly if we try to use Grego::isLeapYear here
+ // NOTE: year&0x3 == year%4
+ return (year >= fGregorianCutoverYear ?
+ (((year&0x3) == 0) && ((year%100 != 0) || (year%400 == 0))) : // Gregorian
+ ((year&0x3) == 0)); // Julian
+}
+
+// -------------------------------------
+
+int32_t GregorianCalendar::handleComputeJulianDay(UCalendarDateFields bestField)
+{
+ fInvertGregorian = false;
+
+ int32_t jd = Calendar::handleComputeJulianDay(bestField);
+
+ if((bestField == UCAL_WEEK_OF_YEAR) && // if we are doing WOY calculations, we are counting relative to Jan 1 *julian*
+ (internalGet(UCAL_EXTENDED_YEAR)==fGregorianCutoverYear) &&
+ jd >= fCutoverJulianDay) {
+ fInvertGregorian = true; // So that the Julian Jan 1 will be used in handleComputeMonthStart
+ return Calendar::handleComputeJulianDay(bestField);
+ }
+
+
+ // The following check handles portions of the cutover year BEFORE the
+ // cutover itself happens.
+ //if ((fIsGregorian==true) != (jd >= fCutoverJulianDay)) { /* cutoverJulianDay)) { */
+ if ((fIsGregorian) != (jd >= fCutoverJulianDay)) { /* cutoverJulianDay)) { */
+#if defined (U_DEBUG_CAL)
+ fprintf(stderr, "%s:%d: jd [invert] %d\n",
+ __FILE__, __LINE__, jd);
+#endif
+ fInvertGregorian = true;
+ jd = Calendar::handleComputeJulianDay(bestField);
+#if defined (U_DEBUG_CAL)
+ fprintf(stderr, "%s:%d: fIsGregorian %s, fInvertGregorian %s - ",
+ __FILE__, __LINE__,fIsGregorian?"T":"F", fInvertGregorian?"T":"F");
+ fprintf(stderr, " jd NOW %d\n",
+ jd);
+#endif
+ } else {
+#if defined (U_DEBUG_CAL)
+ fprintf(stderr, "%s:%d: jd [==] %d - %sfIsGregorian %sfInvertGregorian, %d\n",
+ __FILE__, __LINE__, jd, fIsGregorian?"T":"F", fInvertGregorian?"T":"F", bestField);
+#endif
+ }
+
+ if(fIsGregorian && (internalGet(UCAL_EXTENDED_YEAR) == fGregorianCutoverYear)) {
+ int32_t gregShift = Grego::gregorianShift(internalGet(UCAL_EXTENDED_YEAR));
+ if (bestField == UCAL_DAY_OF_YEAR) {
+#if defined (U_DEBUG_CAL)
+ fprintf(stderr, "%s:%d: [DOY%d] gregorian shift of JD %d += %d\n",
+ __FILE__, __LINE__, fFields[bestField],jd, gregShift);
+#endif
+ jd -= gregShift;
+ } else if ( bestField == UCAL_WEEK_OF_MONTH ) {
+ int32_t weekShift = 14;
+#if defined (U_DEBUG_CAL)
+ fprintf(stderr, "%s:%d: [WOY/WOM] gregorian week shift of %d += %d\n",
+ __FILE__, __LINE__, jd, weekShift);
+#endif
+ jd += weekShift; // shift by weeks for week based fields.
+ }
+ }
+
+ return jd;
+}
+
+int32_t GregorianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month,
+
+ UBool /* useMonth */) const
+{
+ GregorianCalendar *nonConstThis = (GregorianCalendar*)this; // cast away const
+
+ // If the month is out of range, adjust it into range, and
+ // modify the extended year value accordingly.
+ if (month < 0 || month > 11) {
+ eyear += ClockMath::floorDivide(month, 12, &month);
+ }
+
+ UBool isLeap = eyear%4 == 0;
+ int64_t y = (int64_t)eyear-1;
+ int64_t julianDay = 365*y + ClockMath::floorDivide(y, (int64_t)4) + (kJan1_1JulianDay - 3);
+
+ nonConstThis->fIsGregorian = (eyear >= fGregorianCutoverYear);
+#if defined (U_DEBUG_CAL)
+ fprintf(stderr, "%s:%d: (hcms%d/%d) fIsGregorian %s, fInvertGregorian %s\n",
+ __FILE__, __LINE__, eyear,month, fIsGregorian?"T":"F", fInvertGregorian?"T":"F");
+#endif
+ if (fInvertGregorian) {
+ nonConstThis->fIsGregorian = !fIsGregorian;
+ }
+ if (fIsGregorian) {
+ isLeap = isLeap && ((eyear%100 != 0) || (eyear%400 == 0));
+ // Add 2 because Gregorian calendar starts 2 days after
+ // Julian calendar
+ int32_t gregShift = Grego::gregorianShift(eyear);
+#if defined (U_DEBUG_CAL)
+ fprintf(stderr, "%s:%d: (hcms%d/%d) gregorian shift of %d += %d\n",
+ __FILE__, __LINE__, eyear, month, julianDay, gregShift);
+#endif
+ julianDay += gregShift;
+ }
+
+ // At this point julianDay indicates the day BEFORE the first
+ // day of January 1, <eyear> of either the Julian or Gregorian
+ // calendar.
+
+ if (month != 0) {
+ julianDay += isLeap?kLeapNumDays[month]:kNumDays[month];
+ }
+
+ return static_cast<int32_t>(julianDay);
+}
+
+int32_t GregorianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const
+{
+ // If the month is out of range, adjust it into range, and
+ // modify the extended year value accordingly.
+ if (month < 0 || month > 11) {
+ extendedYear += ClockMath::floorDivide(month, 12, &month);
+ }
+
+ return isLeapYear(extendedYear) ? kLeapMonthLength[month] : kMonthLength[month];
+}
+
+int32_t GregorianCalendar::handleGetYearLength(int32_t eyear) const {
+ return isLeapYear(eyear) ? 366 : 365;
+}
+
+
+int32_t
+GregorianCalendar::monthLength(int32_t month) const
+{
+ int32_t year = internalGet(UCAL_EXTENDED_YEAR);
+ return handleGetMonthLength(year, month);
+}
+
+// -------------------------------------
+
+int32_t
+GregorianCalendar::monthLength(int32_t month, int32_t year) const
+{
+ return isLeapYear(year) ? kLeapMonthLength[month] : kMonthLength[month];
+}
+
+// -------------------------------------
+
+int32_t
+GregorianCalendar::yearLength(int32_t year) const
+{
+ return isLeapYear(year) ? 366 : 365;
+}
+
+// -------------------------------------
+
+int32_t
+GregorianCalendar::yearLength() const
+{
+ return isLeapYear(internalGet(UCAL_YEAR)) ? 366 : 365;
+}
+
+// -------------------------------------
+
+/**
+* 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
+GregorianCalendar::pinDayOfMonth()
+{
+ int32_t monthLen = monthLength(internalGetMonth());
+ int32_t dom = internalGet(UCAL_DATE);
+ if(dom > monthLen)
+ set(UCAL_DATE, monthLen);
+}
+
+// -------------------------------------
+
+
+UBool
+GregorianCalendar::validateFields() const
+{
+ for (int32_t field = 0; field < UCAL_FIELD_COUNT; field++) {
+ // Ignore DATE and DAY_OF_YEAR which are handled below
+ if (field != UCAL_DATE &&
+ field != UCAL_DAY_OF_YEAR &&
+ isSet((UCalendarDateFields)field) &&
+ ! boundsCheck(internalGet((UCalendarDateFields)field), (UCalendarDateFields)field))
+ return false;
+ }
+
+ // Values differ in Least-Maximum and Maximum should be handled
+ // specially.
+ if (isSet(UCAL_DATE)) {
+ int32_t date = internalGet(UCAL_DATE);
+ if (date < getMinimum(UCAL_DATE) ||
+ date > monthLength(internalGetMonth())) {
+ return false;
+ }
+ }
+
+ if (isSet(UCAL_DAY_OF_YEAR)) {
+ int32_t days = internalGet(UCAL_DAY_OF_YEAR);
+ if (days < 1 || days > yearLength()) {
+ return false;
+ }
+ }
+
+ // Handle DAY_OF_WEEK_IN_MONTH, which must not have the value zero.
+ // We've checked against minimum and maximum above already.
+ if (isSet(UCAL_DAY_OF_WEEK_IN_MONTH) &&
+ 0 == internalGet(UCAL_DAY_OF_WEEK_IN_MONTH)) {
+ return false;
+ }
+
+ return true;
+}
+
+// -------------------------------------
+
+UBool
+GregorianCalendar::boundsCheck(int32_t value, UCalendarDateFields field) const
+{
+ return value >= getMinimum(field) && value <= getMaximum(field);
+}
+
+// -------------------------------------
+
+UDate
+GregorianCalendar::getEpochDay(UErrorCode& status)
+{
+ complete(status);
+ // Divide by 1000 (convert to seconds) in order to prevent overflow when
+ // dealing with UDate(Long.MIN_VALUE) and UDate(Long.MAX_VALUE).
+ double wallSec = internalGetTime()/1000 + (internalGet(UCAL_ZONE_OFFSET) + internalGet(UCAL_DST_OFFSET))/1000;
+
+ return ClockMath::floorDivide(wallSec, kOneDay/1000.0);
+}
+
+// -------------------------------------
+
+
+// -------------------------------------
+
+/**
+* Compute the julian day number of the day BEFORE the first day of
+* January 1, year 1 of the given calendar. If julianDay == 0, it
+* specifies (Jan. 1, 1) - 1, in whatever calendar we are using (Julian
+* or Gregorian).
+*/
+double GregorianCalendar::computeJulianDayOfYear(UBool isGregorian,
+ int32_t year, UBool& isLeap)
+{
+ isLeap = year%4 == 0;
+ int32_t y = year - 1;
+ double julianDay = 365.0*y + ClockMath::floorDivide(y, 4) + (kJan1_1JulianDay - 3);
+
+ if (isGregorian) {
+ isLeap = isLeap && ((year%100 != 0) || (year%400 == 0));
+ // Add 2 because Gregorian calendar starts 2 days after Julian calendar
+ julianDay += Grego::gregorianShift(year);
+ }
+
+ return julianDay;
+}
+
+// /**
+// * Compute the day of week, relative to the first day of week, from
+// * 0..6, of the current DOW_LOCAL or DAY_OF_WEEK fields. This is
+// * equivalent to get(DOW_LOCAL) - 1.
+// */
+// int32_t GregorianCalendar::computeRelativeDOW() const {
+// int32_t relDow = 0;
+// if (fStamp[UCAL_DOW_LOCAL] > fStamp[UCAL_DAY_OF_WEEK]) {
+// relDow = internalGet(UCAL_DOW_LOCAL) - 1; // 1-based
+// } else if (fStamp[UCAL_DAY_OF_WEEK] != kUnset) {
+// relDow = internalGet(UCAL_DAY_OF_WEEK) - getFirstDayOfWeek();
+// if (relDow < 0) relDow += 7;
+// }
+// return relDow;
+// }
+
+// /**
+// * Compute the day of week, relative to the first day of week,
+// * from 0..6 of the given julian day.
+// */
+// int32_t GregorianCalendar::computeRelativeDOW(double julianDay) const {
+// int32_t relDow = julianDayToDayOfWeek(julianDay) - getFirstDayOfWeek();
+// if (relDow < 0) {
+// relDow += 7;
+// }
+// return relDow;
+// }
+
+// /**
+// * Compute the DOY using the WEEK_OF_YEAR field and the julian day
+// * of the day BEFORE January 1 of a year (a return value from
+// * computeJulianDayOfYear).
+// */
+// int32_t GregorianCalendar::computeDOYfromWOY(double julianDayOfYear) const {
+// // Compute DOY from day of week plus week of year
+
+// // Find the day of the week for the first of this year. This
+// // is zero-based, with 0 being the locale-specific first day of
+// // the week. Add 1 to get first day of year.
+// int32_t fdy = computeRelativeDOW(julianDayOfYear + 1);
+
+// return
+// // Compute doy of first (relative) DOW of WOY 1
+// (((7 - fdy) < getMinimalDaysInFirstWeek())
+// ? (8 - fdy) : (1 - fdy))
+
+// // Adjust for the week number.
+// + (7 * (internalGet(UCAL_WEEK_OF_YEAR) - 1))
+
+// // Adjust for the DOW
+// + computeRelativeDOW();
+// }
+
+// -------------------------------------
+
+double
+GregorianCalendar::millisToJulianDay(UDate millis)
+{
+ return (double)kEpochStartAsJulianDay + ClockMath::floorDivide(millis, (double)kOneDay);
+}
+
+// -------------------------------------
+
+UDate
+GregorianCalendar::julianDayToMillis(double julian)
+{
+ return (UDate) ((julian - kEpochStartAsJulianDay) * (double) kOneDay);
+}
+
+// -------------------------------------
+
+int32_t
+GregorianCalendar::aggregateStamp(int32_t stamp_a, int32_t stamp_b)
+{
+ return (((stamp_a != kUnset && stamp_b != kUnset)
+ ? uprv_max(stamp_a, stamp_b)
+ : (int32_t)kUnset));
+}
+
+// -------------------------------------
+
+/**
+* Roll a field by a signed amount.
+* Note: This will be made public later. [LIU]
+*/
+
+void
+GregorianCalendar::roll(EDateFields field, int32_t amount, UErrorCode& status) {
+ roll((UCalendarDateFields) field, amount, status);
+}
+
+void
+GregorianCalendar::roll(UCalendarDateFields field, int32_t amount, UErrorCode& status) UPRV_NO_SANITIZE_UNDEFINED {
+ if((amount == 0) || U_FAILURE(status)) {
+ return;
+ }
+
+ // J81 processing. (gregorian cutover)
+ UBool inCutoverMonth = false;
+ int32_t cMonthLen=0; // 'c' for cutover; in days
+ int32_t cDayOfMonth=0; // no discontinuity: [0, cMonthLen)
+ double cMonthStart=0.0; // in ms
+
+ // Common code - see if we're in the cutover month of the cutover year
+ if(get(UCAL_EXTENDED_YEAR, status) == fGregorianCutoverYear) {
+ switch (field) {
+ case UCAL_DAY_OF_MONTH:
+ case UCAL_WEEK_OF_MONTH:
+ {
+ int32_t max = monthLength(internalGetMonth());
+ UDate t = internalGetTime();
+ // We subtract 1 from the DAY_OF_MONTH to make it zero-based, and an
+ // additional 10 if we are after the cutover. Thus the monthStart
+ // value will be correct iff we actually are in the cutover month.
+ cDayOfMonth = internalGet(UCAL_DAY_OF_MONTH) - ((t >= fGregorianCutover) ? 10 : 0);
+ cMonthStart = t - ((cDayOfMonth - 1) * kOneDay);
+ // A month containing the cutover is 10 days shorter.
+ if ((cMonthStart < fGregorianCutover) &&
+ (cMonthStart + (cMonthLen=(max-10))*kOneDay >= fGregorianCutover)) {
+ inCutoverMonth = true;
+ }
+ }
+ break;
+ default:
+ ;
+ }
+ }
+
+ switch (field) {
+ case UCAL_WEEK_OF_YEAR: {
+ // Unlike WEEK_OF_MONTH, WEEK_OF_YEAR never shifts the day of the
+ // week. Also, rolling the week of the year can have seemingly
+ // strange effects simply because the year of the week of year
+ // may be different from the calendar year. For example, the
+ // date Dec 28, 1997 is the first day of week 1 of 1998 (if
+ // weeks start on Sunday and the minimal days in first week is
+ // <= 3).
+ int32_t woy = get(UCAL_WEEK_OF_YEAR, status);
+ // Get the ISO year, which matches the week of year. This
+ // may be one year before or after the calendar year.
+ int32_t isoYear = get(UCAL_YEAR_WOY, status);
+ int32_t isoDoy = internalGet(UCAL_DAY_OF_YEAR);
+ if (internalGetMonth() == UCAL_JANUARY) {
+ if (woy >= 52) {
+ isoDoy += handleGetYearLength(isoYear);
+ }
+ } else {
+ if (woy == 1) {
+ isoDoy -= handleGetYearLength(isoYear - 1);
+ }
+ }
+ woy += amount;
+ // Do fast checks to avoid unnecessary computation:
+ if (woy < 1 || woy > 52) {
+ // Determine the last week of the ISO year.
+ // We do this using the standard formula we use
+ // everywhere in this file. If we can see that the
+ // days at the end of the year are going to fall into
+ // week 1 of the next year, we drop the last week by
+ // subtracting 7 from the last day of the year.
+ int32_t lastDoy = handleGetYearLength(isoYear);
+ int32_t lastRelDow = (lastDoy - isoDoy + internalGet(UCAL_DAY_OF_WEEK) -
+ getFirstDayOfWeek()) % 7;
+ if (lastRelDow < 0) lastRelDow += 7;
+ if ((6 - lastRelDow) >= getMinimalDaysInFirstWeek()) lastDoy -= 7;
+ int32_t lastWoy = weekNumber(lastDoy, lastRelDow + 1);
+ woy = ((woy + lastWoy - 1) % lastWoy) + 1;
+ }
+ set(UCAL_WEEK_OF_YEAR, woy);
+ set(UCAL_YEAR_WOY,isoYear);
+ return;
+ }
+
+ case UCAL_DAY_OF_MONTH:
+ if( !inCutoverMonth ) {
+ Calendar::roll(field, amount, status);
+ return;
+ } else {
+ // [j81] 1582 special case for DOM
+ // The default computation works except when the current month
+ // contains the Gregorian cutover. We handle this special case
+ // here. [j81 - aliu]
+ double monthLen = cMonthLen * kOneDay;
+ double msIntoMonth = uprv_fmod(internalGetTime() - cMonthStart +
+ amount * kOneDay, monthLen);
+ if (msIntoMonth < 0) {
+ msIntoMonth += monthLen;
+ }
+#if defined (U_DEBUG_CAL)
+ fprintf(stderr, "%s:%d: roll DOM %d -> %.0lf ms \n",
+ __FILE__, __LINE__,amount, cMonthLen, cMonthStart+msIntoMonth);
+#endif
+ setTimeInMillis(cMonthStart + msIntoMonth, status);
+ return;
+ }
+
+ case UCAL_WEEK_OF_MONTH:
+ if( !inCutoverMonth ) {
+ Calendar::roll(field, amount, status);
+ return;
+ } else {
+#if defined (U_DEBUG_CAL)
+ fprintf(stderr, "%s:%d: roll WOM %d ??????????????????? \n",
+ __FILE__, __LINE__,amount);
+#endif
+ // NOTE: following copied from the old
+ // GregorianCalendar::roll( WEEK_OF_MONTH ) code
+
+ // This is tricky, because during the roll we may have to shift
+ // to a different day of the week. For example:
+
+ // s m t w r f s
+ // 1 2 3 4 5
+ // 6 7 8 9 10 11 12
+
+ // When rolling from the 6th or 7th back one week, we go to the
+ // 1st (assuming that the first partial week counts). The same
+ // thing happens at the end of the month.
+
+ // The other tricky thing is that we have to figure out whether
+ // the first partial week actually counts or not, based on the
+ // minimal first days in the week. And we have to use the
+ // correct first day of the week to delineate the week
+ // boundaries.
+
+ // Here's our algorithm. First, we find the real boundaries of
+ // the month. Then we discard the first partial week if it
+ // doesn't count in this locale. Then we fill in the ends with
+ // phantom days, so that the first partial week and the last
+ // partial week are full weeks. We then have a nice square
+ // block of weeks. We do the usual rolling within this block,
+ // as is done elsewhere in this method. If we wind up on one of
+ // the phantom days that we added, we recognize this and pin to
+ // the first or the last day of the month. Easy, eh?
+
+ // Another wrinkle: To fix jitterbug 81, we have to make all this
+ // work in the oddball month containing the Gregorian cutover.
+ // This month is 10 days shorter than usual, and also contains
+ // a discontinuity in the days; e.g., the default cutover month
+ // is Oct 1582, and goes from day of month 4 to day of month 15.
+
+ // Normalize the DAY_OF_WEEK so that 0 is the first day of the week
+ // in this locale. We have dow in 0..6.
+ int32_t dow = internalGet(UCAL_DAY_OF_WEEK) - getFirstDayOfWeek();
+ if (dow < 0)
+ dow += 7;
+
+ // Find the day of month, compensating for cutover discontinuity.
+ int32_t dom = cDayOfMonth;
+
+ // Find the day of the week (normalized for locale) for the first
+ // of the month.
+ int32_t fdm = (dow - dom + 1) % 7;
+ if (fdm < 0)
+ fdm += 7;
+
+ // Get the first day of the first full week of the month,
+ // including phantom days, if any. Figure out if the first week
+ // counts or not; if it counts, then fill in phantom days. If
+ // not, advance to the first real full week (skip the partial week).
+ int32_t start;
+ if ((7 - fdm) < getMinimalDaysInFirstWeek())
+ start = 8 - fdm; // Skip the first partial week
+ else
+ start = 1 - fdm; // This may be zero or negative
+
+ // Get the day of the week (normalized for locale) for the last
+ // day of the month.
+ int32_t monthLen = cMonthLen;
+ int32_t ldm = (monthLen - dom + dow) % 7;
+ // We know monthLen >= DAY_OF_MONTH so we skip the += 7 step here.
+
+ // Get the limit day for the blocked-off rectangular month; that
+ // is, the day which is one past the last day of the month,
+ // after the month has already been filled in with phantom days
+ // to fill out the last week. This day has a normalized DOW of 0.
+ int32_t limit = monthLen + 7 - ldm;
+
+ // Now roll between start and (limit - 1).
+ int32_t gap = limit - start;
+ int32_t newDom = (dom + amount*7 - start) % gap;
+ if (newDom < 0)
+ newDom += gap;
+ newDom += start;
+
+ // Finally, pin to the real start and end of the month.
+ if (newDom < 1)
+ newDom = 1;
+ if (newDom > monthLen)
+ newDom = monthLen;
+
+ // Set the DAY_OF_MONTH. We rely on the fact that this field
+ // takes precedence over everything else (since all other fields
+ // are also set at this point). If this fact changes (if the
+ // disambiguation algorithm changes) then we will have to unset
+ // the appropriate fields here so that DAY_OF_MONTH is attended
+ // to.
+
+ // If we are in the cutover month, manipulate ms directly. Don't do
+ // this in general because it doesn't work across DST boundaries
+ // (details, details). This takes care of the discontinuity.
+ setTimeInMillis(cMonthStart + (newDom-1)*kOneDay, status);
+ return;
+ }
+
+ default:
+ Calendar::roll(field, amount, status);
+ return;
+ }
+}
+
+// -------------------------------------
+
+
+/**
+* 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().
+* @param field the time field.
+* @return the minimum value that this field could have, given the current date.
+* @deprecated ICU 2.6. Use getActualMinimum(UCalendarDateFields field) instead.
+*/
+int32_t GregorianCalendar::getActualMinimum(EDateFields field) const
+{
+ return getMinimum((UCalendarDateFields)field);
+}
+
+int32_t GregorianCalendar::getActualMinimum(EDateFields field, UErrorCode& /* status */) const
+{
+ return getMinimum((UCalendarDateFields)field);
+}
+
+/**
+* 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().
+* @param field the time field.
+* @return the minimum value that this field could have, given the current date.
+* @draft ICU 2.6.
+*/
+int32_t GregorianCalendar::getActualMinimum(UCalendarDateFields field, UErrorCode& /* status */) const
+{
+ return getMinimum(field);
+}
+
+
+// ------------------------------------
+
+/**
+* Old year limits were least max 292269054, max 292278994.
+*/
+
+/**
+* @stable ICU 2.0
+*/
+int32_t GregorianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
+ return kGregorianCalendarLimits[field][limitType];
+}
+
+/**
+* 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.
+* @stable ICU 2.0
+*/
+int32_t GregorianCalendar::getActualMaximum(UCalendarDateFields field, UErrorCode& status) const
+{
+ /* It is a known limitation that the code here (and in getActualMinimum)
+ * won't behave properly at the extreme limits of GregorianCalendar's
+ * representable range (except for the code that handles the YEAR
+ * field). That's because the ends of the representable range are at
+ * odd spots in the year. For calendars with the default Gregorian
+ * cutover, these limits are Sun Dec 02 16:47:04 GMT 292269055 BC to Sun
+ * Aug 17 07:12:55 GMT 292278994 AD, somewhat different for non-GMT
+ * zones. As a result, if the calendar is set to Aug 1 292278994 AD,
+ * the actual maximum of DAY_OF_MONTH is 17, not 30. If the date is Mar
+ * 31 in that year, the actual maximum month might be Jul, whereas is
+ * the date is Mar 15, the actual maximum might be Aug -- depending on
+ * the precise semantics that are desired. Similar considerations
+ * affect all fields. Nonetheless, this effect is sufficiently arcane
+ * that we permit it, rather than complicating the code to handle such
+ * intricacies. - liu 8/20/98
+
+ * UPDATE: No longer true, since we have pulled in the limit values on
+ * the year. - Liu 11/6/00 */
+
+ switch (field) {
+
+ case UCAL_YEAR:
+ /* The year computation is no different, in principle, from the
+ * others, however, the range of possible maxima is large. In
+ * addition, the way we know we've exceeded the range is different.
+ * For these reasons, we use the special case code below to handle
+ * this field.
+ *
+ * The actual maxima for YEAR depend on the type of calendar:
+ *
+ * Gregorian = May 17, 292275056 BC - Aug 17, 292278994 AD
+ * Julian = Dec 2, 292269055 BC - Jan 3, 292272993 AD
+ * Hybrid = Dec 2, 292269055 BC - Aug 17, 292278994 AD
+ *
+ * We know we've exceeded the maximum when either the month, date,
+ * time, or era changes in response to setting the year. We don't
+ * check for month, date, and time here because the year and era are
+ * sufficient to detect an invalid year setting. NOTE: If code is
+ * added to check the month and date in the future for some reason,
+ * Feb 29 must be allowed to shift to Mar 1 when setting the year.
+ */
+ {
+ if(U_FAILURE(status)) return 0;
+ Calendar *cal = clone();
+ if(!cal) {
+ status = U_MEMORY_ALLOCATION_ERROR;
+ return 0;
+ }
+
+ cal->setLenient(true);
+
+ int32_t era = cal->get(UCAL_ERA, status);
+ UDate d = cal->getTime(status);
+
+ /* Perform a binary search, with the invariant that lowGood is a
+ * valid year, and highBad is an out of range year.
+ */
+ int32_t lowGood = kGregorianCalendarLimits[UCAL_YEAR][1];
+ int32_t highBad = kGregorianCalendarLimits[UCAL_YEAR][2]+1;
+ while ((lowGood + 1) < highBad) {
+ int32_t y = (lowGood + highBad) / 2;
+ cal->set(UCAL_YEAR, y);
+ if (cal->get(UCAL_YEAR, status) == y && cal->get(UCAL_ERA, status) == era) {
+ lowGood = y;
+ } else {
+ highBad = y;
+ cal->setTime(d, status); // Restore original fields
+ }
+ }
+
+ delete cal;
+ return lowGood;
+ }
+
+ default:
+ return Calendar::getActualMaximum(field,status);
+ }
+}
+
+
+int32_t GregorianCalendar::handleGetExtendedYear() {
+ // the year to return
+ int32_t year = kEpochYear;
+
+ // year field to use
+ int32_t yearField = UCAL_EXTENDED_YEAR;
+
+ // There are three separate fields which could be used to
+ // derive the proper year. Use the one most recently set.
+ if (fStamp[yearField] < fStamp[UCAL_YEAR])
+ yearField = UCAL_YEAR;
+ if (fStamp[yearField] < fStamp[UCAL_YEAR_WOY])
+ yearField = UCAL_YEAR_WOY;
+
+ // based on the "best" year field, get the year
+ switch(yearField) {
+ case UCAL_EXTENDED_YEAR:
+ year = internalGet(UCAL_EXTENDED_YEAR, kEpochYear);
+ break;
+
+ case UCAL_YEAR:
+ {
+ // The year defaults to the epoch start, the era to AD
+ int32_t era = internalGet(UCAL_ERA, AD);
+ if (era == BC) {
+ year = 1 - internalGet(UCAL_YEAR, 1); // Convert to extended year
+ } else {
+ year = internalGet(UCAL_YEAR, kEpochYear);
+ }
+ }
+ break;
+
+ case UCAL_YEAR_WOY:
+ year = handleGetExtendedYearFromWeekFields(internalGet(UCAL_YEAR_WOY), internalGet(UCAL_WEEK_OF_YEAR));
+#if defined (U_DEBUG_CAL)
+ // if(internalGet(UCAL_YEAR_WOY) != year) {
+ fprintf(stderr, "%s:%d: hGEYFWF[%d,%d] -> %d\n",
+ __FILE__, __LINE__,internalGet(UCAL_YEAR_WOY),internalGet(UCAL_WEEK_OF_YEAR),year);
+ //}
+#endif
+ break;
+
+ default:
+ year = kEpochYear;
+ }
+ return year;
+}
+
+int32_t GregorianCalendar::handleGetExtendedYearFromWeekFields(int32_t yearWoy, int32_t woy)
+{
+ // convert year to extended form
+ int32_t era = internalGet(UCAL_ERA, AD);
+ if(era == BC) {
+ yearWoy = 1 - yearWoy;
+ }
+ return Calendar::handleGetExtendedYearFromWeekFields(yearWoy, woy);
+}
+
+
+// -------------------------------------
+
+/**
+* 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
+GregorianCalendar::internalGetEra() const {
+ return isSet(UCAL_ERA) ? internalGet(UCAL_ERA) : (int32_t)AD;
+}
+
+const char *
+GregorianCalendar::getType() const {
+ //static const char kGregorianType = "gregorian";
+
+ return "gregorian";
+}
+
+/**
+ * The system maintains a static default century start date and Year. They are
+ * initialized the first time they are used. Once the system default century date
+ * and year are set, they do not change.
+ */
+static UDate gSystemDefaultCenturyStart = DBL_MIN;
+static int32_t gSystemDefaultCenturyStartYear = -1;
+static icu::UInitOnce gSystemDefaultCenturyInit {};
+
+
+UBool GregorianCalendar::haveDefaultCentury() const
+{
+ return true;
+}
+
+static void U_CALLCONV
+initializeSystemDefaultCentury()
+{
+ // initialize systemDefaultCentury and systemDefaultCenturyYear based
+ // on the current time. They'll be set to 80 years before
+ // the current time.
+ UErrorCode status = U_ZERO_ERROR;
+ GregorianCalendar calendar(status);
+ if (U_SUCCESS(status)) {
+ calendar.setTime(Calendar::getNow(), status);
+ calendar.add(UCAL_YEAR, -80, status);
+
+ gSystemDefaultCenturyStart = calendar.getTime(status);
+ gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status);
+ }
+ // We have no recourse upon failure unless we want to propagate the failure
+ // out.
+}
+
+UDate GregorianCalendar::defaultCenturyStart() const {
+ // lazy-evaluate systemDefaultCenturyStart
+ umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
+ return gSystemDefaultCenturyStart;
+}
+
+int32_t GregorianCalendar::defaultCenturyStartYear() const {
+ // lazy-evaluate systemDefaultCenturyStartYear
+ umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
+ return gSystemDefaultCenturyStartYear;
+}
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+
+//eof