The Tor Browser: intl/icu/source/i18n/gregocal.cpp@fc2d59ddac77 (annotated)

intl/icu/source/i18n/gregocal.cpp@fc2d59ddac77 (annotated)

intl/icu/source/i18n/gregocal.cpp

Wed, 31 Dec 2014 07:22:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:22:50 +0100
branch: TOR_BUG_3246
changeset 4: fc2d59ddac77
permissions: -rw-r--r--

Correct previous dual key logic pending first delivery installment.

 /*
 *******************************************************************************
 * Copyright (C) 1997-2013, 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
 };
 /*
 * <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::createDefault(), 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)
 {
 }
 // -------------------------------------
 Calendar* 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;
     fGregorianCutover = date;
     // 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.
     int32_t cutoverDay = (int32_t)ClockMath::floorDivide(fGregorianCutover, (double)kOneDay);
     fNormalizedGregorianCutover = cutoverDay * kOneDay;
     // Handle the rare case of numeric overflow.  If the user specifies a
     // change of UDate(Long.MIN_VALUE), in order to get a pure Gregorian
     // calendar, then the epoch day is -106751991168, which when multiplied
     // by ONE_DAY gives 9223372036794351616 -- the negative value is too
     // large for 64 bits, and overflows into a positive value.  We correct
     // this by using the next day, which for all intents is semantically
     // equivalent.
     if (cutoverDay < 0 && fNormalizedGregorianCutover > 0) {
         fNormalizedGregorianCutover = (cutoverDay + 1) * kOneDay;
     }
     // Normalize the year so BC values are represented as 0 and negative
     // values.
     GregorianCalendar *cal = new GregorianCalendar(getTimeZone(), status);
     /* test for NULL */
     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 = 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
         // computatinally 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_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==TRUE) != (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;
     int32_t y = eyear-1;
     int32_t julianDay = 365*y + ClockMath::floorDivide(y, 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 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(internalGet(UCAL_MONTH));
     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(internalGet(UCAL_MONTH))) {
                 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) &&
 == 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)
 {
     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(internalGet(UCAL_MONTH));
                 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;
                     }
             }
         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 (internalGet(UCAL_MONTH) == 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);
 }
 // -------------------------------------
 UBool
 GregorianCalendar::inDaylightTime(UErrorCode& status) const
 {
     if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
         return FALSE;
     // Force an update of the state of the Calendar.
     ((GregorianCalendar*)this)->complete(status); // cast away const
     return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
 }
 // -------------------------------------
 /**
 * 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        = U_INITONCE_INITIALIZER;
 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

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intl/icu/source/i18n/gregocal.cpp@fc2d59ddac77 (annotated)

intl/icu/source/i18n/gregocal.cpp