2
*******************************************************************************
3
* Copyright (C) 1997-1999, International Business Machines Corporation and *
4
* others. All Rights Reserved. *
5
*******************************************************************************
9
* Modification History:
11
* Date Name Description
12
* 02/05/97 clhuang Creation.
13
* 03/28/97 aliu Made highly questionable fix to computeFields to
14
* handle DST correctly.
15
* 04/22/97 aliu Cleaned up code drastically. Added monthLength().
16
* Finished unimplemented parts of computeTime() for
17
* week-based date determination. Removed quetionable
18
* fix and wrote correct fix for computeFields() and
19
* daylight time handling. Rewrote inDaylightTime()
20
* and computeFields() to handle sensitive Daylight to
21
* Standard time transitions correctly.
22
* 05/08/97 aliu Added code review changes. Fixed isLeapYear() to
24
* 08/12/97 aliu Added equivalentTo. Misc other fixes. Updated
25
* add() from Java source.
26
* 07/28/98 stephen Sync up with JDK 1.2
27
* 09/14/98 stephen Changed type of kOneDay, kOneWeek to double.
29
* 10/15/99 aliu Fixed j31, incorrect WEEK_OF_YEAR computation.
30
* 10/15/99 aliu Fixed j32, cannot set date to Feb 29 2000 AD.
31
* {JDK bug 4210209 4209272}
32
* 11/15/99 weiv Added YEAR_WOY and DOW_LOCAL computation
33
* to timeToFields method, updated kMinValues, kMaxValues & kLeastMaxValues
34
* 12/09/99 aliu Fixed j81, calculation errors and roll bugs
36
* 01/24/2000 aliu Revised computeJulianDay for YEAR YEAR_WOY WOY.
37
********************************************************************************
40
#include "unicode/gregocal.h"
42
// *****************************************************************************
43
// class GregorianCalendar
44
// *****************************************************************************
47
static const int32_t kJan1_1JulianDay = 1721426; // January 1, year 1 (Gregorian)
50
* Note that the Julian date used here is not a true Julian date, since
51
* it is measured from midnight, not noon. This value is the Julian
52
* day number of January 1, 1970 (Gregorian calendar) at noon UTC. [LIU]
54
static const int32_t kEpochStartAsJulianDay = 2440588; // January 1, 1970 (Gregorian)
56
static const int32_t kEpochYear = 1970;
58
static const int32_t kNumDays[]
59
= {0,31,59,90,120,151,181,212,243,273,304,334}; // 0-based, for day-in-year
60
static const int32_t kLeapNumDays[]
61
= {0,31,60,91,121,152,182,213,244,274,305,335}; // 0-based, for day-in-year
62
static const int32_t kMonthLength[]
63
= {31,28,31,30,31,30,31,31,30,31,30,31}; // 0-based
64
static const int32_t kLeapMonthLength[]
65
= {31,29,31,30,31,30,31,31,30,31,30,31}; // 0-based
67
// Useful millisecond constants
68
static const double kOneDay = U_MILLIS_PER_DAY; // 86,400,000
69
static const double kOneWeek = 7.0 * U_MILLIS_PER_DAY; // 604,800,000
71
// These numbers are 2^52 - 1, the largest allowable mantissa in a 64-bit double
72
// with a 0 exponent. These are the absolute largest numbers for millis that
73
// this calendar will handle reliably. It will work for larger values, however.
74
// The problem is that, once the exponent is not 0, the calendar will jump.
75
// When translated into a year, LATEST_SUPPORTED_MILLIS corresponds to 144,683 AD
76
// and EARLIEST_SUPPORTED_MILLIS corresponds to 140,742 BC
77
static const UDate EARLIEST_SUPPORTED_MILLIS = - 4503599627370495.0;
78
static const UDate LATEST_SUPPORTED_MILLIS = 4503599627370495.0;
83
* Field name Minimum Minimum Maximum Maximum
84
* ---------- ------- ------- ------- -------
86
* YEAR 1 1 140742 144683
88
* WEEK_OF_YEAR 1 1 52 53
89
* WEEK_OF_MONTH 0 0 4 6
90
* DAY_OF_MONTH 1 1 28 31
91
* DAY_OF_YEAR 1 1 365 366
93
* DAY_OF_WEEK_IN_MONTH -1 -1 4 6
96
* HOUR_OF_DAY 0 0 23 23
99
* MILLISECOND 0 0 999 999
100
* ZONE_OFFSET -12* -12* 12* 12*
101
* DST_OFFSET 0 0 1* 1*
102
* YEAR_WOY 1 1 140742 144683
105
* (*) In units of one-hour
107
static const int32_t kMinValues[] = {
108
0,1,0,1,0,1,1,1,-1,0,0,0,0,0,0,-12*U_MILLIS_PER_HOUR,0,1,1
110
static const int32_t kLeastMaxValues[] = {
111
1,140742,11,52,4,28,365,7,4,1,11,23,59,59,999,12*U_MILLIS_PER_HOUR,1*U_MILLIS_PER_HOUR,140742,7
113
static const int32_t kMaxValues[] = {
114
1,144683,11,53,6,31,366,7,6,1,11,23,59,59,999,12*U_MILLIS_PER_HOUR,1*U_MILLIS_PER_HOUR, 144683,7
120
const char GregorianCalendar::fgClassID = 0; // Value is irrelevant
122
// 00:00:00 UTC, October 15, 1582, expressed in ms from the epoch.
123
// Note that only Italy and other Catholic countries actually
124
// observed this cutover. Most other countries followed in
125
// the next few centuries, some as late as 1928. [LIU]
126
// in Java, -12219292800000L
127
//const UDate GregorianCalendar::kPapalCutover = -12219292800000L;
128
static const UDate kPapalCutover = (2299161.0 - kEpochStartAsJulianDay) * U_MILLIS_PER_DAY;
130
// -------------------------------------
132
GregorianCalendar::GregorianCalendar(UErrorCode& status)
133
: Calendar(TimeZone::createDefault(), Locale::getDefault(), status),
134
fGregorianCutover(kPapalCutover),
135
fNormalizedGregorianCutover(fGregorianCutover),
136
fGregorianCutoverYear(1582)
138
setTimeInMillis(getNow(), status);
141
// -------------------------------------
143
GregorianCalendar::GregorianCalendar(TimeZone* zone, UErrorCode& status)
144
: Calendar(zone, Locale::getDefault(), status),
145
fGregorianCutover(kPapalCutover),
146
fNormalizedGregorianCutover(fGregorianCutover),
147
fGregorianCutoverYear(1582)
149
setTimeInMillis(getNow(), status);
152
// -------------------------------------
154
GregorianCalendar::GregorianCalendar(const TimeZone& zone, UErrorCode& status)
155
: Calendar(zone, Locale::getDefault(), status),
156
fGregorianCutover(kPapalCutover),
157
fNormalizedGregorianCutover(fGregorianCutover),
158
fGregorianCutoverYear(1582)
160
setTimeInMillis(getNow(), status);
163
// -------------------------------------
165
GregorianCalendar::GregorianCalendar(const Locale& aLocale, UErrorCode& status)
166
: Calendar(TimeZone::createDefault(), aLocale, status),
167
fGregorianCutover(kPapalCutover),
168
fNormalizedGregorianCutover(fGregorianCutover),
169
fGregorianCutoverYear(1582)
171
setTimeInMillis(getNow(), status);
174
// -------------------------------------
176
GregorianCalendar::GregorianCalendar(TimeZone* zone, const Locale& aLocale,
178
: Calendar(zone, aLocale, status),
179
fGregorianCutover(kPapalCutover),
180
fNormalizedGregorianCutover(fGregorianCutover),
181
fGregorianCutoverYear(1582)
183
setTimeInMillis(getNow(), status);
186
// -------------------------------------
188
GregorianCalendar::GregorianCalendar(const TimeZone& zone, const Locale& aLocale,
190
: Calendar(zone, aLocale, status),
191
fGregorianCutover(kPapalCutover),
192
fNormalizedGregorianCutover(fGregorianCutover),
193
fGregorianCutoverYear(1582)
195
setTimeInMillis(getNow(), status);
198
// -------------------------------------
200
GregorianCalendar::GregorianCalendar(int32_t year, int32_t month, int32_t date,
202
: Calendar(TimeZone::createDefault(), Locale::getDefault(), status),
203
fGregorianCutover(kPapalCutover),
204
fNormalizedGregorianCutover(fGregorianCutover),
205
fGregorianCutoverYear(1582)
207
set(Calendar::ERA, AD);
208
set(Calendar::YEAR, year);
209
set(Calendar::MONTH, month);
210
set(Calendar::DATE, date);
213
// -------------------------------------
215
GregorianCalendar::GregorianCalendar(int32_t year, int32_t month, int32_t date,
216
int32_t hour, int32_t minute, UErrorCode& status)
217
: Calendar(TimeZone::createDefault(), Locale::getDefault(), status),
218
fGregorianCutover(kPapalCutover),
219
fNormalizedGregorianCutover(fGregorianCutover),
220
fGregorianCutoverYear(1582)
222
set(Calendar::ERA, AD);
223
set(Calendar::YEAR, year);
224
set(Calendar::MONTH, month);
225
set(Calendar::DATE, date);
226
set(Calendar::HOUR_OF_DAY, hour);
227
set(Calendar::MINUTE, minute);
230
// -------------------------------------
232
GregorianCalendar::GregorianCalendar(int32_t year, int32_t month, int32_t date,
233
int32_t hour, int32_t minute, int32_t second,
235
: Calendar(TimeZone::createDefault(), Locale::getDefault(), status),
236
fGregorianCutover(kPapalCutover),
237
fNormalizedGregorianCutover(fGregorianCutover),
238
fGregorianCutoverYear(1582)
240
set(Calendar::ERA, AD);
241
set(Calendar::YEAR, year);
242
set(Calendar::MONTH, month);
243
set(Calendar::DATE, date);
244
set(Calendar::HOUR_OF_DAY, hour);
245
set(Calendar::MINUTE, minute);
246
set(Calendar::SECOND, second);
249
// -------------------------------------
251
GregorianCalendar::~GregorianCalendar()
255
// -------------------------------------
257
GregorianCalendar::GregorianCalendar(const GregorianCalendar &source)
259
fGregorianCutover(source.fGregorianCutover),
260
fNormalizedGregorianCutover(source.fNormalizedGregorianCutover),
261
fGregorianCutoverYear(source.fGregorianCutoverYear)
265
// -------------------------------------
267
Calendar* GregorianCalendar::clone() const
269
return new GregorianCalendar(*this);
272
// -------------------------------------
275
GregorianCalendar::operator=(const GregorianCalendar &right)
279
Calendar::operator=(right);
280
fGregorianCutover = right.fGregorianCutover;
281
fNormalizedGregorianCutover = right.fNormalizedGregorianCutover;
282
fGregorianCutoverYear = right.fGregorianCutoverYear;
287
// -------------------------------------
290
GregorianCalendar::operator==(const Calendar& that) const
292
GregorianCalendar* other = (GregorianCalendar*)&that;
294
return (this == &that) ||
295
(Calendar::operator==(that) &&
296
getDynamicClassID() == that.getDynamicClassID() &&
297
fGregorianCutover == other->fGregorianCutover);
301
UBool GregorianCalendar::equivalentTo(const Calendar& other) const
303
// Calendar override.
304
// Return true if another Calendar object is equivalent to this one. An equivalent
305
// Calendar will behave exactly as this one does, but may be set to a different time.
306
return Calendar::equivalentTo(other) &&
307
fGregorianCutover == ((GregorianCalendar*)&other)->fGregorianCutover;
310
// -------------------------------------
313
GregorianCalendar::setGregorianChange(UDate date, UErrorCode& status)
315
if (U_FAILURE(status))
318
fGregorianCutover = date;
320
// Precompute two internal variables which we use to do the actual
321
// cutover computations. These are the normalized cutover, which is the
322
// midnight at or before the cutover, and the cutover year. The
323
// normalized cutover is in pure date milliseconds; it contains no time
324
// of day or timezone component, and it used to compare against other
326
UDate cutoverDay = floorDivide(fGregorianCutover, kOneDay);
327
fNormalizedGregorianCutover = cutoverDay * kOneDay;
329
// Handle the rare case of numeric overflow. If the user specifies a
330
// change of UDate(Long.MIN_VALUE), in order to get a pure Gregorian
331
// calendar, then the epoch day is -106751991168, which when multiplied
332
// by ONE_DAY gives 9223372036794351616 -- the negative value is too
333
// large for 64 bits, and overflows into a positive value. We correct
334
// this by using the next day, which for all intents is semantically
336
if (cutoverDay < 0 && fNormalizedGregorianCutover > 0) {
337
fNormalizedGregorianCutover = (cutoverDay + 1) * kOneDay;
340
// Normalize the year so BC values are represented as 0 and negative
342
GregorianCalendar *cal = new GregorianCalendar(getTimeZone(), status);
343
if(U_FAILURE(status))
345
cal->setTime(date, status);
346
fGregorianCutoverYear = cal->get(YEAR, status);
347
if (cal->get(ERA, status) == BC)
348
fGregorianCutoverYear = 1 - fGregorianCutoverYear;
353
// -------------------------------------
356
GregorianCalendar::getGregorianChange() const
358
return fGregorianCutover;
361
// -------------------------------------
364
GregorianCalendar::isLeapYear(int32_t year) const
366
return (year >= fGregorianCutoverYear ?
367
((year%4 == 0) && ((year%100 != 0) || (year%400 == 0))) : // Gregorian
368
(year%4 == 0)); // Julian
372
// -------------------------------------
375
* Compute the date-based fields given the milliseconds since the epoch start.
376
* Do not compute the time-based fields (HOUR, MINUTE, etc.).
378
* @param theTime the given time as LOCAL milliseconds, not UTC.
381
GregorianCalendar::timeToFields(UDate theTime, UBool quick, UErrorCode& status)
383
if (U_FAILURE(status))
387
int32_t year, yearOfWeekOfYear, month, date, dayOfWeek, locDayOfWeek, dayOfYear, era;
390
// Compute the year, month, and day of month from the given millis
391
if (theTime >= fNormalizedGregorianCutover) {
392
// The Gregorian epoch day is zero for Monday January 1, year 1.
393
double gregorianEpochDay = millisToJulianDay(theTime) - kJan1_1JulianDay;
394
// Here we convert from the day number to the multiple radix
395
// representation. We use 400-year, 100-year, and 4-year cycles.
396
// For example, the 4-year cycle has 4 years + 1 leap day; giving
397
// 1461 == 365*4 + 1 days.
399
int32_t n400 = floorDivide(gregorianEpochDay, 146097, rem); // 400-year cycle length
400
int32_t n100 = floorDivide(rem[0], 36524, rem); // 100-year cycle length
401
int32_t n4 = floorDivide(rem[0], 1461, rem); // 4-year cycle length
402
int32_t n1 = floorDivide(rem[0], 365, rem);
403
rawYear = 400*n400 + 100*n100 + 4*n4 + n1;
404
dayOfYear = rem[0]; // zero-based day of year
405
if (n100 == 4 || n1 == 4)
406
dayOfYear = 365; // Dec 31 at end of 4- or 400-yr cycle
410
isLeap = ((rawYear&0x3) == 0) && // equiv. to (rawYear%4 == 0)
411
(rawYear%100 != 0 || rawYear%400 == 0);
413
// Gregorian day zero is a Monday
414
dayOfWeek = (int32_t)uprv_fmod(gregorianEpochDay + 1, 7);
417
// The Julian epoch day (not the same as Julian Day)
418
// is zero on Saturday December 30, 0 (Gregorian).
419
double julianEpochDay = millisToJulianDay(theTime) - (kJan1_1JulianDay - 2);
420
rawYear = (int32_t) floorDivide(4*julianEpochDay + 1464, 1461.0);
422
// Compute the Julian calendar day number for January 1, rawYear
423
double january1 = 365.0 * (rawYear - 1) + floorDivide((double)(rawYear - 1), 4.0);
424
dayOfYear = (int32_t)(julianEpochDay - january1); // 0-based
426
// Julian leap years occurred historically every 4 years starting
427
// with 8 AD. Before 8 AD the spacing is irregular; every 3 years
428
// from 45 BC to 9 BC, and then none until 8 AD. However, we don't
429
// implement this historical detail; instead, we implement the
430
// computatinally cleaner proleptic calendar, which assumes
431
// consistent 4-year cycles throughout time.
432
isLeap = ((rawYear & 0x3) == 0); // equiv. to (rawYear%4 == 0)
434
// Julian calendar day zero is a Saturday
435
dayOfWeek = (int32_t)uprv_fmod(julianEpochDay-1, 7);
438
// Common Julian/Gregorian calculation
439
int32_t correction = 0;
440
int32_t march1 = isLeap ? 60 : 59; // zero-based DOY for March 1
441
if (dayOfYear >= march1)
442
correction = isLeap ? 1 : 2;
443
month = (12 * (dayOfYear + correction) + 6) / 367; // zero-based month
445
(isLeap ? kLeapNumDays[month] : kNumDays[month]) + 1; // one-based DOM
447
// Normalize day of week
448
dayOfWeek += (dayOfWeek < 0) ? (SUNDAY+7) : SUNDAY;
458
// Adjust the doy for the cutover year. Do this AFTER the above
459
// computations using doy! [j81 - aliu]
460
if (rawYear == fGregorianCutoverYear &&
461
theTime >= fNormalizedGregorianCutover) {
465
// Calculate year of week of year
468
internalSet(ERA, era);
469
internalSet(YEAR, year);
470
internalSet(MONTH, month + JANUARY); // 0-based
471
internalSet(DATE, date);
472
internalSet(DAY_OF_WEEK, dayOfWeek);
473
internalSet(DAY_OF_YEAR, ++dayOfYear); // Convert from 0-based to 1-based
477
yearOfWeekOfYear = year;
479
// Compute the week of the year. Valid week numbers run from 1 to 52
480
// or 53, depending on the year, the first day of the week, and the
481
// minimal days in the first week. Days at the start of the year may
482
// fall into the last week of the previous year; days at the end of
483
// the year may fall into the first week of the next year.
484
int32_t relDow = (dayOfWeek + 7 - getFirstDayOfWeek()) % 7; // 0..6
485
int32_t relDowJan1 = (dayOfWeek - dayOfYear + 701 - getFirstDayOfWeek()) % 7; // 0..6
486
int32_t woy = (dayOfYear - 1 + relDowJan1) / 7; // 0..53
487
if ((7 - relDowJan1) >= getMinimalDaysInFirstWeek()) {
489
// Check to see if we are in the last week; if so, we need
490
// to handle the case in which we are the first week of the
492
int32_t lastDoy = yearLength();
493
int32_t lastRelDow = (relDow + lastDoy - dayOfYear) % 7;
494
if (lastRelDow < 0) lastRelDow += 7;
495
if (dayOfYear > 359 && // Fast check which eliminates most cases
496
(6 - lastRelDow) >= getMinimalDaysInFirstWeek() &&
497
(dayOfYear + 7 - relDow) > lastDoy) {
503
// We are the last week of the previous year.
504
int32_t prevDoy = dayOfYear + yearLength(rawYear - 1);
505
woy = weekNumber(prevDoy, dayOfWeek);
510
internalSet(WEEK_OF_YEAR, woy);
511
internalSet(YEAR_WOY, yearOfWeekOfYear);
513
internalSet(WEEK_OF_MONTH, weekNumber(date, dayOfWeek));
514
internalSet(DAY_OF_WEEK_IN_MONTH, (date-1) / 7 + 1);
516
// Calculate localized day of week
517
locDayOfWeek = dayOfWeek-getFirstDayOfWeek()+1;
518
locDayOfWeek += (locDayOfWeek<1?7:0);
519
internalSet(DOW_LOCAL, locDayOfWeek);
522
// -------------------------------------
525
* Return the week number of a day, within a period. This may be the week number in
526
* a year, or the week number in a month. Usually this will be a value >= 1, but if
527
* some initial days of the period are excluded from week 1, because
528
* minimalDaysInFirstWeek is > 1, then the week number will be zero for those
529
* initial days. Requires the day of week for the given date in order to determine
530
* the day of week of the first day of the period.
532
* @param dayOfPeriod Day-of-year or day-of-month. Should be 1 for first day of period.
533
* @param day Day-of-week for given dayOfPeriod. 1-based with 1=Sunday.
534
* @return Week number, one-based, or zero if the day falls in part of the
535
* month before the first week, when there are days before the first
536
* week because the minimum days in the first week is more than one.
539
GregorianCalendar::weekNumber(int32_t dayOfPeriod, int32_t dayOfWeek)
541
// Determine the day of the week of the first day of the period
542
// in question (either a year or a month). Zero represents the
543
// first day of the week on this calendar.
544
int32_t periodStartDayOfWeek = (dayOfWeek - getFirstDayOfWeek() - dayOfPeriod + 1) % 7;
545
if (periodStartDayOfWeek < 0)
546
periodStartDayOfWeek += 7;
548
// Compute the week number. Initially, ignore the first week, which
549
// may be fractional (or may not be). We add periodStartDayOfWeek in
550
// order to fill out the first week, if it is fractional.
551
int32_t weekNo = (dayOfPeriod + periodStartDayOfWeek - 1)/7;
553
// If the first week is long enough, then count it. If
554
// the minimal days in the first week is one, or if the period start
555
// is zero, we always increment weekNo.
556
if ((7 - periodStartDayOfWeek) >= getMinimalDaysInFirstWeek())
562
// -------------------------------------
565
GregorianCalendar::monthLength(int32_t month) const
567
int32_t year = internalGet(YEAR);
568
if(internalGetEra() == BC) {
572
return monthLength(month, year);
575
// -------------------------------------
578
GregorianCalendar::monthLength(int32_t month, int32_t year) const
580
return isLeapYear(year) ? kLeapMonthLength[month] : kMonthLength[month];
583
// -------------------------------------
586
GregorianCalendar::yearLength(int32_t year) const
588
return isLeapYear(year) ? 366 : 365;
591
// -------------------------------------
594
GregorianCalendar::yearLength() const
596
return isLeapYear(internalGet(YEAR)) ? 366 : 365;
599
// -------------------------------------
603
* Converts UTC as milliseconds to time field values.
604
* The time is <em>not</em>
605
* recomputed first; to recompute the time, then the fields, call the
606
* <code>complete</code> method.
607
* @see Calendar#complete
610
GregorianCalendar::computeFields(UErrorCode& status)
612
if (U_FAILURE(status))
615
int32_t rawOffset = getTimeZone().getRawOffset();
616
double localMillis = internalGetTime() + rawOffset;
618
/* Check for very extreme values -- millis near Long.MIN_VALUE or
619
* Long.MAX_VALUE. For these values, adding the zone offset can push
620
* the millis past MAX_VALUE to MIN_VALUE, or vice versa. This produces
621
* the undesirable effect that the time can wrap around at the ends,
622
* yielding, for example, a UDate(Long.MAX_VALUE) with a big BC year
623
* (should be AD). Handle this by pinning such values to Long.MIN_VALUE
624
* or Long.MAX_VALUE. - liu 8/11/98 bug 4149677 */
627
* Since in C++ we use doubles instead of longs for dates, there is
628
* an inherent loss of range in the calendar (because in Java you have all 64
629
* bits to store data, while in C++ you have only 52 bits of mantissa.
630
* So, I will pin to these (2^52 - 1) values instead */
632
if(internalGetTime() > 0 && localMillis < 0 && rawOffset > 0) {
633
localMillis = LATEST_SUPPORTED_MILLIS;
635
else if(internalGetTime() < 0 && localMillis > 0 && rawOffset < 0) {
636
localMillis = EARLIEST_SUPPORTED_MILLIS;
639
// Time to fields takes the wall millis (Standard or DST).
640
timeToFields(localMillis, FALSE, status);
642
uint8_t era = (uint8_t) internalGetEra();
643
int32_t year = internalGet(YEAR);
644
int32_t month = internalGet(MONTH);
645
int32_t date = internalGet(DATE);
646
uint8_t dayOfWeek = (uint8_t) internalGet(DAY_OF_WEEK);
648
double days = uprv_floor(localMillis / kOneDay);
649
int32_t millisInDay = (int32_t) (localMillis - (days * kOneDay));
651
millisInDay += U_MILLIS_PER_DAY;
653
// Call getOffset() to get the TimeZone offset. The millisInDay value must
654
// be standard local millis.
655
int32_t dstOffset = getTimeZone().getOffset(era, year, month, date, dayOfWeek, millisInDay,
656
monthLength(month), status) - rawOffset;
657
if(U_FAILURE(status))
660
// Adjust our millisInDay for DST, if necessary.
661
millisInDay += dstOffset;
663
// If DST has pushed us into the next day, we must call timeToFields() again.
664
// This happens in DST between 12:00 am and 1:00 am every day. The call to
665
// timeToFields() will give the wrong day, since the Standard time is in the
667
if (millisInDay >= U_MILLIS_PER_DAY) {
668
UDate dstMillis = localMillis + dstOffset;
669
millisInDay -= U_MILLIS_PER_DAY;
670
// As above, check for and pin extreme values
671
if(localMillis > 0 && dstMillis < 0 && dstOffset > 0) {
672
dstMillis = LATEST_SUPPORTED_MILLIS;
674
else if(localMillis < 0 && dstMillis > 0 && dstOffset < 0) {
675
dstMillis = EARLIEST_SUPPORTED_MILLIS;
677
timeToFields(dstMillis, FALSE, status);
680
// Fill in all time-related fields based on millisInDay. Call internalSet()
681
// so as not to perturb flags.
682
internalSet(MILLISECOND, millisInDay % 1000);
684
internalSet(SECOND, millisInDay % 60);
686
internalSet(MINUTE, millisInDay % 60);
688
internalSet(HOUR_OF_DAY, millisInDay);
689
internalSet(AM_PM, millisInDay / 12); // Assume AM == 0
690
internalSet(HOUR, millisInDay % 12);
692
internalSet(ZONE_OFFSET, rawOffset);
693
internalSet(DST_OFFSET, dstOffset);
695
// Careful here: We are manually setting the time stamps[] flags to
696
// INTERNALLY_SET, so we must be sure that the above code actually does
697
// set all these fields.
698
for (int i=0; i<FIELD_COUNT; ++i) {
699
fStamp[i] = kInternallySet;
700
fIsSet[i] = TRUE; // Remove later
704
// -------------------------------------
707
* After adjustments such as add(MONTH), add(YEAR), we don't want the
708
* month to jump around. E.g., we don't want Jan 31 + 1 month to go to Mar
709
* 3, we want it to go to Feb 28. Adjustments which might run into this
710
* problem call this method to retain the proper month.
713
GregorianCalendar::pinDayOfMonth()
715
int32_t monthLen = monthLength(internalGet(MONTH));
716
int32_t dom = internalGet(DAY_OF_MONTH);
718
set(DAY_OF_MONTH, monthLen);
721
// -------------------------------------
724
GregorianCalendar::validateFields() const
726
for (int32_t field = 0; field < FIELD_COUNT; field++) {
727
// Ignore DATE and DAY_OF_YEAR which are handled below
729
field != DAY_OF_YEAR &&
730
isSet((EDateFields)field) &&
731
! boundsCheck(internalGet((EDateFields)field), (EDateFields)field))
736
// Values differ in Least-Maximum and Maximum should be handled
739
int32_t date = internalGet(DATE);
740
if (date < getMinimum(DATE) ||
741
date > monthLength(internalGet(MONTH))) {
746
if (isSet(DAY_OF_YEAR)) {
747
int32_t days = internalGet(DAY_OF_YEAR);
748
if (days < 1 || days > yearLength())
752
// Handle DAY_OF_WEEK_IN_MONTH, which must not have the value zero.
753
// We've checked against minimum and maximum above already.
754
if (isSet(DAY_OF_WEEK_IN_MONTH) &&
755
0 == internalGet(DAY_OF_WEEK_IN_MONTH))
761
// -------------------------------------
764
GregorianCalendar::boundsCheck(int32_t value, EDateFields field) const
766
return value >= getMinimum(field) && value <= getMaximum(field);
769
// -------------------------------------
772
GregorianCalendar::getEpochDay(UErrorCode& status)
775
// Divide by 1000 (convert to seconds) in order to prevent overflow when
776
// dealing with UDate(Long.MIN_VALUE) and UDate(Long.MAX_VALUE).
777
double wallSec = internalGetTime()/1000 + (internalGet(ZONE_OFFSET) + internalGet(DST_OFFSET))/1000;
779
// {sfb} force conversion to double
780
return uprv_trunc(wallSec / (kOneDay/1000.0));
781
//return floorDivide(wallSec, kOneDay/1000.0);
784
// -------------------------------------
787
GregorianCalendar::computeTime(UErrorCode& status)
789
if (U_FAILURE(status))
792
if (! isLenient() && ! validateFields()) {
793
status = U_ILLEGAL_ARGUMENT_ERROR;
797
// This function takes advantage of the fact that unset fields in
798
// the time field list have a value of zero.
800
// The year is either the YEAR or the epoch year. YEAR_WOY is
801
// used only if WOY is the predominant field; see computeJulianDay.
802
int32_t year = (fStamp[YEAR] != kUnset) ? internalGet(YEAR) : kEpochYear;
804
if (fStamp[ERA] != kUnset) {
805
era = internalGet(ERA);
808
// Even in lenient mode we disallow ERA values other than AD & BC
809
else if (era != AD) {
810
status = U_ILLEGAL_ARGUMENT_ERROR;
815
// First, use the year to determine whether to use the Gregorian or the
816
// Julian calendar. If the year is not the year of the cutover, this
817
// computation will be correct. But if the year is the cutover year,
818
// this may be incorrect. In that case, assume the Gregorian calendar,
819
// make the computation, and then recompute if the resultant millis
820
// indicate the wrong calendar has been assumed.
822
// A date such as Oct. 10, 1582 does not exist in a Gregorian calendar
823
// with the default changeover of Oct. 15, 1582, since in such a
824
// calendar Oct. 4 (Julian) is followed by Oct. 15 (Gregorian). This
825
// algorithm will interpret such a date using the Julian calendar,
826
// yielding Oct. 20, 1582 (Gregorian).
827
UBool isGregorian = year >= fGregorianCutoverYear;
828
double julianDay = computeJulianDay(isGregorian, year);
829
double millis = julianDayToMillis(julianDay);
831
// The following check handles portions of the cutover year BEFORE the
832
// cutover itself happens. The check for the julianDate number is for a
833
// rare case; it's a hardcoded number, but it's efficient. The given
834
// Julian day number corresponds to Dec 3, 292269055 BC, which
835
// corresponds to millis near Long.MIN_VALUE. The need for the check
836
// arises because for extremely negative Julian day numbers, the millis
837
// actually overflow to be positive values. Without the check, the
838
// initial date is interpreted with the Gregorian calendar, even when
839
// the cutover doesn't warrant it.
840
if (isGregorian != (millis >= fNormalizedGregorianCutover) &&
841
julianDay != -106749550580.0) { // See above
842
julianDay = computeJulianDay(!isGregorian, year);
843
millis = julianDayToMillis(julianDay);
846
// Do the time portion of the conversion.
848
int32_t millisInDay = 0;
850
// Find the best set of fields specifying the time of day. There
851
// are only two possibilities here; the HOUR_OF_DAY or the
852
// AM_PM and the HOUR.
853
int32_t hourOfDayStamp = fStamp[HOUR_OF_DAY];
854
int32_t hourStamp = fStamp[HOUR];
855
int32_t bestStamp = (hourStamp > hourOfDayStamp) ? hourStamp : hourOfDayStamp;
858
if (bestStamp != kUnset) {
859
if (bestStamp == hourOfDayStamp)
860
// Don't normalize here; let overflow bump into the next period.
861
// This is consistent with how we handle other fields.
862
millisInDay += internalGet(HOUR_OF_DAY);
865
// Don't normalize here; let overflow bump into the next period.
866
// This is consistent with how we handle other fields.
867
millisInDay += internalGet(HOUR);
869
millisInDay += 12 * internalGet(AM_PM); // Default works for unset AM_PM
873
// We use the fact that unset == 0; we start with millisInDay
876
millisInDay += internalGet(MINUTE); // now have minutes
878
millisInDay += internalGet(SECOND); // now have seconds
880
millisInDay += internalGet(MILLISECOND); // now have millis
882
// Compute the time zone offset and DST offset. There are two potential
883
// ambiguities here. We'll assume a 2:00 am (wall time) switchover time
884
// for discussion purposes here.
885
// 1. The transition into DST. Here, a designated time of 2:00 am - 2:59 am
886
// can be in standard or in DST depending. However, 2:00 am is an invalid
887
// representation (the representation jumps from 1:59:59 am Std to 3:00:00 am DST).
888
// We assume standard time.
889
// 2. The transition out of DST. Here, a designated time of 1:00 am - 1:59 am
890
// can be in standard or DST. Both are valid representations (the rep
891
// jumps from 1:59:59 DST to 1:00:00 Std).
892
// Again, we assume standard time.
893
// We use the TimeZone object, unless the user has explicitly set the ZONE_OFFSET
894
// or DST_OFFSET fields; then we use those fields.
895
const TimeZone& zone = getTimeZone();
896
int32_t zoneOffset = (fStamp[ZONE_OFFSET] >= kMinimumUserStamp)
897
/*isSet(ZONE_OFFSET) && userSetZoneOffset*/ ?
898
internalGet(ZONE_OFFSET) : zone.getRawOffset();
900
// Now add date and millisInDay together, to make millis contain local wall
901
// millis, with no zone or DST adjustments
902
millis += millisInDay;
904
int32_t dstOffset = 0;
905
if (fStamp[ZONE_OFFSET] >= kMinimumUserStamp
906
/*isSet(DST_OFFSET) && userSetDSTOffset*/)
907
dstOffset = internalGet(DST_OFFSET);
909
/* Normalize the millisInDay to 0..ONE_DAY-1. If the millis is out
910
* of range, then we must call timeToFields() to recompute our
912
int32_t normalizedMillisInDay [1];
913
floorDivide(millis, (int32_t)kOneDay, normalizedMillisInDay);
915
// We need to have the month, the day, and the day of the week.
916
// Calling timeToFields will compute the MONTH and DATE fields.
917
// If we're lenient then we need to call timeToFields() to
918
// normalize the year, month, and date numbers.
920
if (isLenient() || fStamp[MONTH] == kUnset || fStamp[DATE] == kUnset
921
|| millisInDay != normalizedMillisInDay[0]) {
922
timeToFields(millis, TRUE, status); // Use wall time; true == do quick computation
923
dow = (uint8_t) internalGet(DAY_OF_WEEK); // DOW is computed by timeToFields
926
// It's tempting to try to use DAY_OF_WEEK here, if it
927
// is set, but we CAN'T. Even if it's set, it might have
928
// been set wrong by the user. We should rely only on
929
// the Julian day number, which has been computed correctly
930
// using the disambiguation algorithm above. [LIU]
931
dow = julianDayToDayOfWeek(julianDay);
934
// It's tempting to try to use DAY_OF_WEEK here, if it
935
// is set, but we CAN'T. Even if it's set, it might have
936
// been set wrong by the user. We should rely only on
937
// the Julian day number, which has been computed correctly
938
// using the disambiguation algorithm above. [LIU]
939
dstOffset = zone.getOffset((uint8_t)era,
944
normalizedMillisInDay[0],
945
monthLength(internalGet(MONTH)),
948
// Note: Because we pass in wall millisInDay, rather than
949
// standard millisInDay, we interpret "1:00 am" on the day
950
// of cessation of DST as "1:00 am Std" (assuming the time
951
// of cessation is 2:00 am).
954
// Store our final computed GMT time, with timezone adjustments.
955
internalSetTime(millis - zoneOffset - dstOffset);
958
// -------------------------------------
961
* Compute the julian day number of the day BEFORE the first day of
962
* January 1, year 1 of the given calendar. If julianDay == 0, it
963
* specifies (Jan. 1, 1) - 1, in whatever calendar we are using (Julian
966
double GregorianCalendar::computeJulianDayOfYear(UBool isGregorian,
967
int32_t year, UBool& isLeap) {
968
isLeap = year%4 == 0;
969
int32_t y = year - 1;
970
double julianDay = 365.0*y + floorDivide(y, 4) + (kJan1_1JulianDay - 3);
973
isLeap = isLeap && ((year%100 != 0) || (year%400 == 0));
974
// Add 2 because Gregorian calendar starts 2 days after Julian calendar
975
julianDay += floorDivide(y, 400) - floorDivide(y, 100) + 2;
982
* Compute the day of week, relative to the first day of week, from
983
* 0..6, of the current DOW_LOCAL or DAY_OF_WEEK fields. This is
984
* equivalent to get(DOW_LOCAL) - 1.
986
int32_t GregorianCalendar::computeRelativeDOW() const {
988
if (fStamp[DOW_LOCAL] > fStamp[DAY_OF_WEEK]) {
989
relDow = internalGet(DOW_LOCAL) - 1; // 1-based
990
} else if (fStamp[DAY_OF_WEEK] != kUnset) {
991
relDow = internalGet(DAY_OF_WEEK) - getFirstDayOfWeek();
992
if (relDow < 0) relDow += 7;
998
* Compute the day of week, relative to the first day of week,
999
* from 0..6 of the given julian day.
1001
int32_t GregorianCalendar::computeRelativeDOW(double julianDay) const {
1002
int32_t relDow = julianDayToDayOfWeek(julianDay) - getFirstDayOfWeek();
1010
* Compute the DOY using the WEEK_OF_YEAR field and the julian day
1011
* of the day BEFORE January 1 of a year (a return value from
1012
* computeJulianDayOfYear).
1014
int32_t GregorianCalendar::computeDOYfromWOY(double julianDayOfYear) const {
1015
// Compute DOY from day of week plus week of year
1017
// Find the day of the week for the first of this year. This
1018
// is zero-based, with 0 being the locale-specific first day of
1019
// the week. Add 1 to get first day of year.
1020
int32_t fdy = computeRelativeDOW(julianDayOfYear + 1);
1023
// Compute doy of first (relative) DOW of WOY 1
1024
(((7 - fdy) < getMinimalDaysInFirstWeek())
1025
? (8 - fdy) : (1 - fdy))
1027
// Adjust for the week number.
1028
+ (7 * (internalGet(WEEK_OF_YEAR) - 1))
1030
// Adjust for the DOW
1031
+ computeRelativeDOW();
1035
GregorianCalendar::computeJulianDay(UBool isGregorian, int32_t year)
1037
// Find the most recent set of fields specifying the day within
1038
// the year. These may be any of the following combinations:
1039
// MONTH* + DAY_OF_MONTH*
1040
// MONTH* + WEEK_OF_MONTH* + DAY_OF_WEEK
1041
// MONTH* + DAY_OF_WEEK_IN_MONTH* + DAY_OF_WEEK
1043
// WEEK_OF_YEAR* + DAY_OF_WEEK*
1044
// WEEK_OF_YEAR* + DOW_LOCAL
1045
// We look for the most recent of the fields marked thus*. If other
1046
// fields are missing, we use their default values, which are those of
1047
// the epoch start, or in the case of DAY_OF_WEEK, the first day in
1049
int32_t monthStamp = fStamp[MONTH];
1050
int32_t domStamp = fStamp[DAY_OF_MONTH];
1051
int32_t womStamp = fStamp[WEEK_OF_MONTH];
1052
int32_t dowimStamp = fStamp[DAY_OF_WEEK_IN_MONTH];
1053
int32_t doyStamp = fStamp[DAY_OF_YEAR];
1054
int32_t woyStamp = fStamp[WEEK_OF_YEAR];
1059
int32_t bestStamp = (monthStamp > domStamp) ? monthStamp : domStamp;
1060
if (womStamp > bestStamp) bestStamp = womStamp;
1061
if (dowimStamp > bestStamp) bestStamp = dowimStamp;
1062
if (doyStamp > bestStamp) bestStamp = doyStamp;
1063
if (woyStamp >= bestStamp) {
1064
// Note use of >= here, rather than >. We will see woy ==
1065
// best if (a) all stamps are unset, in which case the
1066
// specific handling of unset will be used below, or (b) all
1067
// stamps are kInternallySet. In the latter case we want to
1068
// use the YEAR_WOY if it is newer.
1069
if (fStamp[YEAR_WOY] > fStamp[YEAR]) {
1070
year = internalGet(YEAR_WOY);
1071
if (fStamp[ERA] != kUnset && internalGet(ERA) == BC) {
1074
// Only the WOY algorithm correctly handles YEAR_WOY, so
1075
// force its use by making its stamp the most recent.
1076
// This only affects the situation in which all stamps are
1077
// equal (see above).
1078
bestStamp = ++woyStamp;
1079
} else if (woyStamp > bestStamp) {
1080
// The WOY stamp is not only equal to, but newer than any
1081
// other stamp. This means the WOY has been explicitly
1082
// set, and will be used for computation.
1083
bestStamp = woyStamp;
1084
if (fStamp[YEAR_WOY] != kUnset && fStamp[YEAR_WOY] >= fStamp[YEAR]) {
1086
// The YEAR_WOY is set, and is not superceded by the
1088
year = internalGet(YEAR_WOY);
1091
/* At this point we cannot avoid using the WEEK_OF_YEAR together
1092
* with the YEAR field, since the YEAR_WOY is unavailable. Our goal
1093
* is round-trip field integrity. We cannot guarantee round-trip
1094
* time integrity because the YEAR + WOY combination may be
1095
* ambiguous; consider a calendar with MDFW 3 and FDW Sunday. YEAR
1096
* 1997 + WOY 1 + DOW Wednesday specifies two days: Jan 1 1997, and
1097
* Dec 31 1997. However, we can guarantee that the YEAR fields, as
1098
* set, will remain unchanged.
1100
* In general, YEAR and YEAR_WOY are equal, but at the ends of the
1101
* years, the YEAR and YEAR_WOY can differ by one. To detect this
1102
* in WOY 1, we look at the position of WOY 1. If it extends into
1103
* the previous year, then we check the DOW and see if it falls in
1104
* the previous year. If so, we increment the year. This allows us
1105
* to have round-trip integrity on the YEAR field.
1107
* If the WOY is >= 52, then we do an intial computation of the DOY
1108
* for the current year. If this exceeds the length of this year,
1109
* we decrement the year. Again, this provides round-trip integrity
1110
* on the YEAR field. - aliu
1113
else if (internalGet(WEEK_OF_YEAR) == 1) {
1114
// YEAR_WOY has not been set, so we must use the YEAR.
1115
// Since WOY computations rely on the YEAR_WOY, not the
1116
// YEAR, we must guess at its value. It is usually equal
1117
// to the YEAR, but may be one greater in WOY 1, and may
1118
// be one less in WOY >= 52. Note that YEAR + WOY is
1119
// ambiguous (YEAR_WOY + WOY is not).
1121
// FDW = Mon, MDFW = 2, Mon Dec 27 1999, WOY 1, YEAR_WOY 2000
1123
// Find out where WOY 1 falls; some of it may extend
1124
// into the previous year. If so, and if the DOW is
1125
// one of those days, then increment the YEAR_WOY.
1126
julianDay = computeJulianDayOfYear(isGregorian, year, isLeap);
1127
int32_t fdy = computeRelativeDOW(1 + julianDay);
1130
(((7 - fdy) < getMinimalDaysInFirstWeek())
1131
? (8 - fdy) : (1 - fdy));
1134
// Some of WOY 1 for YEAR year extends into YEAR
1135
// year-1 if doy < 1. doy == 0 -- 1 day of WOY 1
1136
// in previous year; doy == -1 -- 2 days, etc.
1138
// Compute the day of week, relative to the first day of week,
1140
int32_t relDow = computeRelativeDOW();
1142
// Range of days that are in YEAR year (as opposed
1143
// to YEAR year-1) are DOY == 1..6+doy. Range of
1144
// days of the week in YEAR year are fdy..fdy + 5
1145
// + doy. These are relative DOWs.
1146
if ((relDow < fdy) || (relDow > (fdy + 5 + doy))) {
1151
} else if (internalGet(WEEK_OF_YEAR) >= 52) {
1152
// FDW = Mon, MDFW = 4, Sat Jan 01 2000, WOY 52, YEAR_WOY 1999
1153
julianDay = computeJulianDayOfYear(isGregorian, year, isLeap);
1154
if (computeDOYfromWOY(julianDay) > yearLength(year)) {
1157
// It's tempting to take our julianDay and DOY here, in an else
1158
// clause, and return them, since they are correct. However,
1159
// this neglects the cutover adjustment, and it's easier to
1160
// maintain the code if everything goes through the same control
1161
// path below. - aliu
1166
// The following if() clause checks if the month field
1167
// predominates. This set of computations must be done BEFORE
1168
// using the year, since the year value may be adjusted here.
1169
UBool useMonth = FALSE;
1171
if (bestStamp != kUnset &&
1172
(bestStamp == monthStamp ||
1173
bestStamp == domStamp ||
1174
bestStamp == womStamp ||
1175
bestStamp == dowimStamp)) {
1178
// We have the month specified. Make it 0-based for the algorithm.
1179
month = (monthStamp != kUnset) ? internalGet(MONTH) - JANUARY : 0;
1181
// If the month is out of range, adjust it into range
1182
if (month < 0 || month > 11) {
1184
year += floorDivide(month, 12, rem);
1189
// Compute the julian day number of the day BEFORE the first day of
1190
// January 1, year 1 of the given calendar. If julianDay == 0, it
1191
// specifies (Jan. 1, 1) - 1, in whatever calendar we are using (Julian
1193
julianDay = computeJulianDayOfYear(isGregorian, year, isLeap);
1197
// Move julianDay to the day BEFORE the first of the month.
1198
julianDay += isLeap ? kLeapNumDays[month] : kNumDays[month];
1201
if (bestStamp == domStamp ||
1202
bestStamp == monthStamp) {
1204
date = (domStamp != kUnset) ? internalGet(DAY_OF_MONTH) : 1;
1206
else { // assert(bestStamp == womStamp || bestStamp == dowimStamp)
1207
// Compute from day of week plus week number or from the day of
1208
// week plus the day of week in month. The computations are
1209
// almost identical.
1211
// Find the day of the week for the first of this month. This
1212
// is zero-based, with 0 being the locale-specific first day of
1213
// the week. Add 1 to get first day of month.
1214
int32_t fdm = computeRelativeDOW(julianDay + 1);
1216
// Find the start of the first week. This will be a date from
1217
// 1..-6. It represents the locale-specific first day of the
1218
// week of the first day of the month, ignoring minimal days in
1220
date = 1 - fdm + ((fStamp[DAY_OF_WEEK] != kUnset) ?
1221
(internalGet(DAY_OF_WEEK) - getFirstDayOfWeek()) : 0);
1223
if (bestStamp == womStamp) {
1224
// Adjust for minimal days in first week.
1225
if ((7 - fdm) < getMinimalDaysInFirstWeek())
1228
// Now adjust for the week number.
1229
date += 7 * (internalGet(WEEK_OF_MONTH) - 1);
1231
else { // assert(bestStamp == dowimStamp)
1232
// Adjust into the month, if needed.
1233
if (date < 1) date += 7;
1235
// We are basing this on the day-of-week-in-month. The only
1236
// trickiness occurs if the day-of-week-in-month is
1238
int32_t dim = internalGet(DAY_OF_WEEK_IN_MONTH);
1240
date += 7*(dim - 1);
1242
// Move date to the last of this day-of-week in this
1243
// month, then back up as needed. If dim==-1, we don't
1244
// back up at all. If dim==-2, we back up once, etc.
1245
// Don't back up past the first of the given day-of-week
1246
// in this month. Note that we handle -2, -3,
1247
// etc. correctly, even though values < -1 are
1248
// technically disallowed.
1249
date += ((monthLength(internalGet(MONTH), year) - date) / 7 + dim + 1) * 7;
1257
// assert(bestStamp == doyStamp || bestStamp == woyStamp ||
1258
// bestStamp == UNSET). In the last case we should use January 1.
1260
// No month, start with January 0 (day before Jan 1), then adjust.
1263
UBool doCutoverAdjustment = TRUE;
1265
if (bestStamp == kUnset) {
1266
doy = 1; // Advance to January 1
1267
doCutoverAdjustment = FALSE;
1269
else if (bestStamp == doyStamp) {
1270
doy = internalGet(DAY_OF_YEAR);
1272
else if (bestStamp == woyStamp) {
1273
doy = computeDOYfromWOY(julianDay);
1276
// Adjust for cutover year [j81 - aliu]
1277
if (doCutoverAdjustment && year == fGregorianCutoverYear && isGregorian) {
1286
// -------------------------------------
1289
GregorianCalendar::millisToJulianDay(UDate millis)
1291
return (double)kEpochStartAsJulianDay + floorDivide(millis, kOneDay);
1292
//return kEpochStartAsJulianDay + uprv_trunc(millis / kOneDay);
1295
// -------------------------------------
1298
GregorianCalendar::julianDayToMillis(double julian)
1300
return (UDate) ((julian - kEpochStartAsJulianDay) * (double) kOneDay);
1303
// -------------------------------------
1306
GregorianCalendar::floorDivide(double numerator, double denominator)
1308
return uprv_floor(numerator / denominator);
1311
// -------------------------------------
1314
GregorianCalendar::floorDivide(int32_t numerator, int32_t denominator)
1316
// We do this computation in order to handle
1317
// a numerator of Long.MIN_VALUE correctly
1318
return (numerator >= 0) ?
1319
numerator / denominator :
1320
((numerator + 1) / denominator) - 1;
1323
// -------------------------------------
1326
GregorianCalendar::floorDivide(int32_t numerator, int32_t denominator, int32_t remainder[])
1328
if (numerator >= 0) {
1329
remainder[0] = numerator % denominator;
1330
return numerator / denominator;
1332
int32_t quotient = ((numerator + 1) / denominator) - 1;
1333
remainder[0] = numerator - (quotient * denominator);
1337
// -------------------------------------
1340
GregorianCalendar::floorDivide(double numerator, int32_t denominator, int32_t remainder[])
1343
if (numerator >= 0) {
1344
quotient = uprv_trunc(numerator / denominator);
1345
remainder[0] = (int32_t)uprv_fmod(numerator, denominator);
1347
quotient = uprv_trunc((numerator + 1) / denominator) - 1;
1348
remainder[0] = (int32_t)(numerator - (quotient * denominator));
1350
if (quotient < INT32_MIN || quotient > INT32_MAX) {
1351
// Normalize out of range values. It doesn't matter what
1352
// we return for these cases; the data is wrong anyway. This
1353
// only occurs for years near 2,000,000,000 CE/BCE.
1354
quotient = 0.0; // Or whatever
1356
return (int32_t)quotient;
1360
// -------------------------------------
1363
GregorianCalendar::aggregateStamp(int32_t stamp_a, int32_t stamp_b)
1365
return (((stamp_a != kUnset && stamp_b != kUnset)
1366
? uprv_max(stamp_a, stamp_b)
1370
// -------------------------------------
1373
GregorianCalendar::add(EDateFields field, int32_t amount, UErrorCode& status)
1375
if (U_FAILURE(status))
1379
return; // Do nothing!
1382
if (field == YEAR || field == YEAR_WOY) {
1383
int32_t year = internalGet(field);
1384
int32_t era = internalGetEra();
1385
year += (era == AD) ? amount : -amount;
1389
set(field, 1 - year);
1390
// if year == 0, you get 1 BC
1391
set(ERA, (AD + BC) - era);
1395
else if (field == MONTH) {
1396
int32_t month = internalGet(MONTH) + amount;
1398
add(YEAR, (int32_t) (month / 12), status);
1399
set(MONTH, (int32_t) (month % 12));
1403
add(YEAR, (int32_t) ((month + 1) / 12) - 1, status);
1407
set(MONTH, JANUARY + month);
1411
else if (field == ERA) {
1412
int32_t era = internalGet(ERA) + amount;
1420
// We handle most fields here. The algorithm is to add a computed amount
1421
// of millis to the current millis. The only wrinkle is with DST -- if
1422
// the result of the add operation is to move from DST to Standard, or vice
1423
// versa, we need to adjust by an hour forward or back, respectively.
1424
// Otherwise you get weird effects in which the hour seems to shift when
1425
// you add to the DAY_OF_MONTH field, for instance.
1427
// We only adjust the DST for fields larger than an hour. For fields
1428
// smaller than an hour, we cannot adjust for DST without causing problems.
1429
// for instance, if you add one hour to April 5, 1998, 1:00 AM, in PST,
1430
// the time becomes "2:00 AM PDT" (an illegal value), but then the adjustment
1431
// sees the change and compensates by subtracting an hour. As a result the
1432
// time doesn't advance at all.
1434
// {sfb} do we want to use a double here, or a int32_t?
1435
// probably a double, since if we used a int32_t in the
1436
// WEEK_OF_YEAR clause below, if delta was greater than approx.
1437
// 7.1 we would reach the limit of a int32_t
1438
double delta = amount;
1439
UBool adjustDST = TRUE;
1444
case DAY_OF_WEEK_IN_MONTH:
1445
delta *= 7 * 24 * 60 * 60 * 1000; // 7 days
1449
delta *= 12 * 60 * 60 * 1000; // 12 hrs
1452
case DATE: // synonym of DAY_OF_MONTH
1456
delta *= 24 * 60 * 60 * 1000; // 1 day
1461
delta *= 60 * 60 * 1000; // 1 hour
1466
delta *= 60 * 1000; // 1 minute
1471
delta *= 1000; // 1 second
1482
status = U_ILLEGAL_ARGUMENT_ERROR;
1486
// Save the current DST state.
1489
dst = internalGet(DST_OFFSET);
1491
setTimeInMillis(internalGetTime() + delta, status); // Automatically computes fields if necessary
1494
// Now do the DST adjustment alluded to above.
1495
// Only call setTimeInMillis if necessary, because it's an expensive call.
1496
dst -= internalGet(DST_OFFSET);
1498
setTimeInMillis(internalGetTime() + dst, status);
1503
// -------------------------------------
1506
* Roll a field by a signed amount.
1507
* Note: This will be made public later. [LIU]
1510
GregorianCalendar::roll(EDateFields field, int32_t amount, UErrorCode& status)
1512
if(U_FAILURE(status))
1516
return; // Nothing to do
1519
int32_t min = 0, max = 0, gap;
1520
if (field >= 0 && field < FIELD_COUNT) {
1522
min = getMinimum(field);
1523
max = getMaximum(field);
1526
/* Some of the fields require special handling to work in the month
1527
* containing the Gregorian cutover point. Do shared computations
1528
* for these fields here. [j81 - aliu] */
1529
UBool inCutoverMonth = FALSE;
1530
int32_t cMonthLen=0; // 'c' for cutover; in days
1531
int32_t cDayOfMonth=0; // no discontinuity: [0, cMonthLen)
1532
double cMonthStart=0.0; // in ms
1533
if (field == DAY_OF_MONTH || field == WEEK_OF_MONTH) {
1534
max = monthLength(internalGet(MONTH));
1535
double t = internalGetTime();
1536
// We subtract 1 from the DAY_OF_MONTH to make it zero-based, and an
1537
// additional 10 if we are after the cutover. Thus the monthStart
1538
// value will be correct iff we actually are in the cutover month.
1539
cDayOfMonth = internalGet(DAY_OF_MONTH) - ((t >= fGregorianCutover) ? 10 : 0);
1540
cMonthStart = t - ((cDayOfMonth - 1) * kOneDay);
1542
// A month containing the cutover is 10 days shorter.
1543
if ((cMonthStart < fGregorianCutover) &&
1544
(cMonthStart + (cMonthLen=(max-10))*kOneDay >= fGregorianCutover)) {
1545
inCutoverMonth = TRUE;
1557
// These fields are handled simply, since they have fixed minima
1558
// and maxima. The field DAY_OF_MONTH is almost as simple. Other
1559
// fields are complicated, since the range within they must roll
1560
// varies depending on the date.
1565
// Rolling the hour is difficult on the ONSET and CEASE days of
1566
// daylight savings. For example, if the change occurs at
1567
// 2 AM, we have the following progression:
1568
// ONSET: 12 Std -> 1 Std -> 3 Dst -> 4 Dst
1569
// CEASE: 12 Dst -> 1 Dst -> 1 Std -> 2 Std
1570
// To get around this problem we don't use fields; we manipulate
1571
// the time in millis directly.
1573
// Assume min == 0 in calculations below
1574
UDate start = getTime(status);
1575
int32_t oldHour = internalGet(field);
1576
int32_t newHour = (oldHour + amount) % (max + 1);
1579
setTime(start + ((double)U_MILLIS_PER_HOUR * (newHour - oldHour)), status);
1583
// Rolling the month involves both pinning the final value to [0, 11]
1584
// and adjusting the DAY_OF_MONTH if necessary. We only adjust the
1585
// DAY_OF_MONTH if, after updating the MONTH field, it is illegal.
1586
// E.g., <jan31>.roll(MONTH, 1) -> <feb28> or <feb29>.
1588
int32_t mon = (internalGet(MONTH) + amount) % 12;
1593
// Keep the day of month in range. We don't want to spill over
1594
// into the next month; e.g., we don't want jan31 + 1 mo -> feb31 ->
1596
// NOTE: We could optimize this later by checking for dom <= 28
1597
// first. Do this if there appears to be a need. [LIU]
1598
int32_t monthLen = monthLength(mon);
1599
int32_t dom = internalGet(DAY_OF_MONTH);
1601
set(DAY_OF_MONTH, monthLen);
1607
// Unlike WEEK_OF_MONTH, WEEK_OF_YEAR never shifts the day of the
1608
// week. However, rolling the week of the year can have seemingly
1609
// strange effects simply because the year of the week of year
1610
// may be different from the calendar year. For example, the
1611
// date Dec 28, 1997 is the first day of week 1 of 1998 (if
1612
// weeks start on Sunday and the minimal days in first week is
1614
int32_t woy = internalGet(WEEK_OF_YEAR);
1615
// Get the ISO year, which matches the week of year. This
1616
// may be one year before or after the calendar year.
1617
int32_t isoYear = internalGet(YEAR_WOY);
1618
int32_t isoDoy = internalGet(DAY_OF_YEAR);
1619
if (internalGet(MONTH) == Calendar::JANUARY) {
1621
isoDoy += yearLength(isoYear);
1626
isoDoy -= yearLength(isoYear-1);
1630
// Do fast checks to avoid unnecessary computation:
1631
if (woy < 1 || woy > 52) {
1632
// Determine the last week of the ISO year.
1633
// We do this using the standard formula we use
1634
// everywhere in this file. If we can see that the
1635
// days at the end of the year are going to fall into
1636
// week 1 of the next year, we drop the last week by
1637
// subtracting 7 from the last day of the year.
1638
int32_t lastDoy = yearLength(isoYear);
1639
int32_t lastRelDow = (lastDoy - isoDoy + internalGet(DAY_OF_WEEK) -
1640
getFirstDayOfWeek()) % 7;
1643
if ((6 - lastRelDow) >= getMinimalDaysInFirstWeek())
1645
int32_t lastWoy = weekNumber(lastDoy, lastRelDow + 1);
1646
woy = ((woy + lastWoy - 1) % lastWoy) + 1;
1648
set(WEEK_OF_YEAR, woy);
1649
set(YEAR_WOY, isoYear); // make YEAR_WOY timestamp > YEAR timestamp
1654
// This is tricky, because during the roll we may have to shift
1655
// to a different day of the week. For example:
1661
// When rolling from the 6th or 7th back one week, we go to the
1662
// 1st (assuming that the first partial week counts). The same
1663
// thing happens at the end of the month.
1665
// The other tricky thing is that we have to figure out whether
1666
// the first partial week actually counts or not, based on the
1667
// minimal first days in the week. And we have to use the
1668
// correct first day of the week to delineate the week
1671
// Here's our algorithm. First, we find the real boundaries of
1672
// the month. Then we discard the first partial week if it
1673
// doesn't count in this locale. Then we fill in the ends with
1674
// phantom days, so that the first partial week and the last
1675
// partial week are full weeks. We then have a nice square
1676
// block of weeks. We do the usual rolling within this block,
1677
// as is done elsewhere in this method. If we wind up on one of
1678
// the phantom days that we added, we recognize this and pin to
1679
// the first or the last day of the month. Easy, eh?
1681
// Another wrinkle: To fix jitterbug 81, we have to make all this
1682
// work in the oddball month containing the Gregorian cutover.
1683
// This month is 10 days shorter than usual, and also contains
1684
// a discontinuity in the days; e.g., the default cutover month
1685
// is Oct 1582, and goes from day of month 4 to day of month 15.
1687
// Normalize the DAY_OF_WEEK so that 0 is the first day of the week
1688
// in this locale. We have dow in 0..6.
1689
int32_t dow = internalGet(DAY_OF_WEEK) - getFirstDayOfWeek();
1693
// Find the day of month, compensating for cutover discontinuity.
1694
int32_t dom = inCutoverMonth ? cDayOfMonth : internalGet(DAY_OF_MONTH);
1696
// Find the day of the week (normalized for locale) for the first
1698
int32_t fdm = (dow - dom + 1) % 7;
1702
// Get the first day of the first full week of the month,
1703
// including phantom days, if any. Figure out if the first week
1704
// counts or not; if it counts, then fill in phantom days. If
1705
// not, advance to the first real full week (skip the partial week).
1707
if ((7 - fdm) < getMinimalDaysInFirstWeek())
1708
start = 8 - fdm; // Skip the first partial week
1710
start = 1 - fdm; // This may be zero or negative
1712
// Get the day of the week (normalized for locale) for the last
1713
// day of the month.
1714
int32_t monthLen = inCutoverMonth ? cMonthLen : monthLength(internalGet(MONTH));
1715
int32_t ldm = (monthLen - dom + dow) % 7;
1716
// We know monthLen >= DAY_OF_MONTH so we skip the += 7 step here.
1718
// Get the limit day for the blocked-off rectangular month; that
1719
// is, the day which is one past the last day of the month,
1720
// after the month has already been filled in with phantom days
1721
// to fill out the last week. This day has a normalized DOW of 0.
1722
int32_t limit = monthLen + 7 - ldm;
1724
// Now roll between start and (limit - 1).
1725
gap = limit - start;
1726
int32_t newDom = (dom + amount*7 - start) % gap;
1731
// Finally, pin to the real start and end of the month.
1734
if (newDom > monthLen)
1737
// Set the DAY_OF_MONTH. We rely on the fact that this field
1738
// takes precedence over everything else (since all other fields
1739
// are also set at this point). If this fact changes (if the
1740
// disambiguation algorithm changes) then we will have to unset
1741
// the appropriate fields here so that DAY_OF_MONTH is attended
1744
// If we are in the cutover month, manipulate ms directly. Don't do
1745
// this in general because it doesn't work across DST boundaries
1746
// (details, details). This takes care of the discontinuity.
1747
if (inCutoverMonth) {
1748
setTimeInMillis(cMonthStart + (newDom-1)*kOneDay, status);
1750
set(DAY_OF_MONTH, newDom);
1755
if (inCutoverMonth) {
1756
// The default computation works except when the current month
1757
// contains the Gregorian cutover. We handle this special case
1758
// here. [j81 - aliu]
1759
double monthLen = cMonthLen * kOneDay;
1760
double msIntoMonth = uprv_fmod(internalGetTime() - cMonthStart +
1761
amount * kOneDay, monthLen);
1762
if (msIntoMonth < 0) {
1763
msIntoMonth += monthLen;
1765
setTimeInMillis(cMonthStart + msIntoMonth, status);
1768
max = monthLength(internalGet(MONTH));
1769
// ...else fall through to default computation
1774
// Roll the day of year using millis. Compute the millis for
1775
// the start of the year, and get the length of the year.
1776
double delta = amount * kOneDay; // Scale up from days to millis
1777
double min2 = internalGetTime() - (internalGet(DAY_OF_YEAR) - 1) * kOneDay;
1778
int32_t yearLen = yearLength();
1779
internalSetTime( uprv_fmod((internalGetTime() + delta - min2), (yearLen * kOneDay)));
1780
if (internalGetTime() < 0)
1781
internalSetTime( internalGetTime() + yearLen * kOneDay);
1783
setTimeInMillis(internalGetTime() + min2, status);
1790
// Roll the day of week using millis. Compute the millis for
1791
// the start of the week, using the first day of week setting.
1792
// Restrict the millis to [start, start+7days).
1793
double delta = amount * kOneDay; // Scale up from days to millis
1794
// Compute the number of days before the current day in this
1795
// week. This will be a value 0..6.
1796
int32_t leadDays = internalGet(field) -
1797
((field == DAY_OF_WEEK) ? getFirstDayOfWeek() : 1);
1800
double min2 = internalGetTime() - leadDays * kOneDay;
1801
internalSetTime(uprv_fmod((internalGetTime() + delta - min2), kOneWeek));
1802
if (internalGetTime() < 0)
1803
internalSetTime(internalGetTime() + kOneWeek);
1804
setTimeInMillis(internalGetTime() + min2, status);
1807
case DAY_OF_WEEK_IN_MONTH:
1809
// Roll the day of week in the month using millis. Determine
1810
// the first day of the week in the month, and then the last,
1811
// and then roll within that range.
1812
double delta = amount * kOneWeek; // Scale up from weeks to millis
1813
// Find the number of same days of the week before this one
1815
int32_t preWeeks = (internalGet(DAY_OF_MONTH) - 1) / 7;
1816
// Find the number of same days of the week after this one
1818
int32_t postWeeks = (monthLength(internalGet(MONTH)) - internalGet(DAY_OF_MONTH)) / 7;
1819
// From these compute the min and gap millis for rolling.
1820
double min2 = internalGetTime() - preWeeks * kOneWeek;
1821
double gap2 = kOneWeek * (preWeeks + postWeeks + 1); // Must add 1!
1822
// Roll within this range
1823
internalSetTime(uprv_fmod((internalGetTime() + delta - min2), gap2));
1824
if (internalGetTime() < 0)
1825
internalSetTime(internalGetTime() + gap2);
1826
setTimeInMillis(internalGetTime() + min2, status);
1832
status = U_ILLEGAL_ARGUMENT_ERROR;
1834
// These fields cannot be rolled
1837
// These are the standard roll instructions. These work for all
1838
// simple cases, that is, cases in which the limits are fixed, such
1839
// as the hour, the month, and the era.
1840
gap = max - min + 1;
1841
int32_t value = internalGet(field) + amount;
1842
value = (value - min) % gap;
1851
// -------------------------------------
1854
GregorianCalendar::getMinimum(EDateFields field) const
1856
return kMinValues[field];
1859
// -------------------------------------
1862
GregorianCalendar::getMaximum(EDateFields field) const
1864
return kMaxValues[field];
1867
// -------------------------------------
1870
GregorianCalendar::getGreatestMinimum(EDateFields field) const
1872
return kMinValues[field];
1875
// -------------------------------------
1878
GregorianCalendar::getLeastMaximum(EDateFields field) const
1880
return kLeastMaxValues[field];
1883
// -------------------------------------
1886
GregorianCalendar::getActualMinimum(EDateFields field) const
1888
return getMinimum(field);
1891
// -------------------------------------
1894
GregorianCalendar::getActualMaximum(EDateFields field) const
1896
/* It is a known limitation that the code here (and in getActualMinimum)
1897
* won't behave properly at the extreme limits of GregorianCalendar's
1898
* representable range (except for the code that handles the YEAR
1899
* field). That's because the ends of the representable range are at
1900
* odd spots in the year. For calendars with the default Gregorian
1901
* cutover, these limits are Sun Dec 02 16:47:04 GMT 292269055 BC to Sun
1902
* Aug 17 07:12:55 GMT 292278994 AD, somewhat different for non-GMT
1903
* zones. As a result, if the calendar is set to Aug 1 292278994 AD,
1904
* the actual maximum of DAY_OF_MONTH is 17, not 30. If the date is Mar
1905
* 31 in that year, the actual maximum month might be Jul, whereas is
1906
* the date is Mar 15, the actual maximum might be Aug -- depending on
1907
* the precise semantics that are desired. Similar considerations
1908
* affect all fields. Nonetheless, this effect is sufficiently arcane
1909
* that we permit it, rather than complicating the code to handle such
1910
* intricacies. - liu 8/20/98 */
1912
UErrorCode status = U_ZERO_ERROR;
1915
// we have functions that enable us to fast-path number of days in month
1918
return monthLength(get(MONTH, status));
1921
return yearLength();
1923
// for week of year, week of month, or day of week in month, we
1924
// just fall back on the default implementation in Calendar (I'm not sure
1925
// we could do better by having special calculations here)
1928
case DAY_OF_WEEK_IN_MONTH:
1929
return Calendar::getActualMaximum(field, status);
1933
/* The year computation is no different, in principle, from the
1934
* others, however, the range of possible maxima is large. In
1935
* addition, the way we know we've exceeded the range is different.
1936
* For these reasons, we use the special case code below to handle
1939
* The actual maxima for YEAR depend on the type of calendar:
1941
* Gregorian = May 17, 292275056 BC - Aug 17, 292278994 AD
1942
* Julian = Dec 2, 292269055 BC - Jan 3, 292272993 AD
1943
* Hybrid = Dec 2, 292269055 BC - Aug 17, 292278994 AD
1945
* We know we've exceeded the maximum when either the month, date,
1946
* time, or era changes in response to setting the year. We don't
1947
* check for month, date, and time here because the year and era are
1948
* sufficient to detect an invalid year setting. NOTE: If code is
1949
* added to check the month and date in the future for some reason,
1950
* Feb 29 must be allowed to shift to Mar 1 when setting the year.
1953
Calendar *cal = (Calendar*)this->clone();
1954
cal->setLenient(TRUE);
1956
int32_t era = cal->get(ERA, status);
1957
if(U_FAILURE(status))
1960
UDate d = cal->getTime(status);
1961
if(U_FAILURE(status))
1964
/* Perform a binary search, with the invariant that lowGood is a
1965
* valid year, and highBad is an out of range year.
1967
int32_t lowGood = kLeastMaxValues[field];
1968
int32_t highBad = kMaxValues[field] + 1;
1969
while((lowGood + 1) < highBad) {
1970
int32_t y = (lowGood + highBad) / 2;
1972
if(cal->get(field, status) == y && cal->get(ERA, status) == era) {
1977
cal->setTime(d, status); // Restore original fields
1985
// and we know none of the other fields have variable maxima in
1986
// GregorianCalendar, so we can just return the fixed maximum
1988
return getMaximum(field);
1992
// -------------------------------------
1995
GregorianCalendar::inDaylightTime(UErrorCode& status) const
1997
if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
2000
// Force an update of the state of the Calendar.
2001
((GregorianCalendar*)this)->complete(status); // cast away const
2003
return (UBool)(U_SUCCESS(status) ? (internalGet(DST_OFFSET) != 0) : FALSE);
2006
// -------------------------------------
2009
* Return the ERA. We need a special method for this because the
2010
* default ERA is AD, but a zero (unset) ERA is BC.
2013
GregorianCalendar::internalGetEra() const {
2014
return isSet(ERA) ? internalGet(ERA) : AD;
added
removed
source/i18n/gregocal.cpp
