1 // Copyright (C) 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
4 * Copyright (C) 2003-2014, International Business Machines Corporation
5 * and others. All Rights Reserved.
6 ******************************************************************************
9 *****************************************************************************
12 #include "indiancal.h"
14 #if !UCONFIG_NO_FORMATTING
18 #include "gregoimp.h" // Math
19 #include "astro.h" // CalendarAstronomer
23 #ifdef U_DEBUG_INDIANCAL
31 // Implementation of the IndianCalendar class
33 //-------------------------------------------------------------------------
35 //-------------------------------------------------------------------------
38 Calendar* IndianCalendar::clone() const {
39 return new IndianCalendar(*this);
42 IndianCalendar::IndianCalendar(const Locale& aLocale, UErrorCode& success)
43 : Calendar(TimeZone::createDefault(), aLocale, success)
45 setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
48 IndianCalendar::IndianCalendar(const IndianCalendar& other) : Calendar(other) {
51 IndianCalendar::~IndianCalendar()
54 const char *IndianCalendar::getType() const {
58 static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
59 // Minimum Greatest Least Maximum
62 { -5000000, -5000000, 5000000, 5000000}, // YEAR
63 { 0, 0, 11, 11}, // MONTH
64 { 1, 1, 52, 53}, // WEEK_OF_YEAR
65 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
66 { 1, 1, 30, 31}, // DAY_OF_MONTH
67 { 1, 1, 365, 366}, // DAY_OF_YEAR
68 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
69 { -1, -1, 5, 5}, // DAY_OF_WEEK_IN_MONTH
70 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
71 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
72 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
73 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
74 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
75 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
76 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
77 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
78 { -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
79 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
80 { -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR
81 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
82 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
83 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
86 static const double JULIAN_EPOCH = 1721425.5;
87 static const int32_t INDIAN_ERA_START = 78;
88 static const int32_t INDIAN_YEAR_START = 80;
90 int32_t IndianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
91 return LIMITS[field][limitType];
95 * Determine whether the given gregorian year is a Leap year
97 static UBool isGregorianLeap(int32_t year)
99 return ((year % 4) == 0) && (!(((year % 100) == 0) && ((year % 400) != 0)));
102 //----------------------------------------------------------------------
103 // Calendar framework
104 //----------------------------------------------------------------------
107 * Return the length (in days) of the given month.
109 * @param eyear The year in Saka Era
110 * @param month The month(0-based) in Indian calendar
112 int32_t IndianCalendar::handleGetMonthLength(int32_t eyear, int32_t month) const {
113 if (month < 0 || month > 11) {
114 eyear += ClockMath::floorDivide(month, 12, month);
117 if (isGregorianLeap(eyear + INDIAN_ERA_START) && month == 0) {
121 if (month >= 1 && month <= 5) {
129 * Return the number of days in the given Indian year
131 * @param eyear The year in Saka Era.
133 int32_t IndianCalendar::handleGetYearLength(int32_t eyear) const {
134 return isGregorianLeap(eyear + INDIAN_ERA_START) ? 366 : 365;
137 * Returns the Julian Day corresponding to gregorian date
139 * @param year The Gregorian year
140 * @param month The month in Gregorian Year
141 * @param date The date in Gregorian day in month
143 static double gregorianToJD(int32_t year, int32_t month, int32_t date) {
144 double julianDay = (JULIAN_EPOCH - 1) +
146 uprv_floor((year - 1) / 4) +
147 (-uprv_floor((year - 1) / 100)) +
148 uprv_floor((year - 1) / 400) +
149 uprv_floor((((367 * month) - 362) / 12) +
151 (isGregorianLeap(year) ? -1 : -2)
159 * Returns the Gregorian Date corresponding to a given Julian Day
160 * @param jd The Julian Day
162 static int32_t* jdToGregorian(double jd, int32_t gregorianDate[3]) {
163 double wjd, depoch, quadricent, dqc, cent, dcent, quad, dquad, yindex, yearday, leapadj;
164 int32_t year, month, day;
165 wjd = uprv_floor(jd - 0.5) + 0.5;
166 depoch = wjd - JULIAN_EPOCH;
167 quadricent = uprv_floor(depoch / 146097);
168 dqc = (int32_t)uprv_floor(depoch) % 146097;
169 cent = uprv_floor(dqc / 36524);
170 dcent = (int32_t)uprv_floor(dqc) % 36524;
171 quad = uprv_floor(dcent / 1461);
172 dquad = (int32_t)uprv_floor(dcent) % 1461;
173 yindex = uprv_floor(dquad / 365);
174 year = (int32_t)((quadricent * 400) + (cent * 100) + (quad * 4) + yindex);
175 if (!((cent == 4) || (yindex == 4))) {
178 yearday = wjd - gregorianToJD(year, 1, 1);
179 leapadj = ((wjd < gregorianToJD(year, 3, 1)) ? 0
181 (isGregorianLeap(year) ? 1 : 2)
183 month = (int32_t)uprv_floor((((yearday + leapadj) * 12) + 373) / 367);
184 day = (int32_t)(wjd - gregorianToJD(year, month, 1)) + 1;
186 gregorianDate[0] = year;
187 gregorianDate[1] = month;
188 gregorianDate[2] = day;
190 return gregorianDate;
194 //-------------------------------------------------------------------------
195 // Functions for converting from field values to milliseconds....
196 //-------------------------------------------------------------------------
197 static double IndianToJD(int32_t year, int32_t month, int32_t date) {
198 int32_t leapMonth, gyear, m;
201 gyear = year + INDIAN_ERA_START;
204 if(isGregorianLeap(gyear)) {
206 start = gregorianToJD(gyear, 3, 21);
210 start = gregorianToJD(gyear, 3, 22);
214 jd = start + (date - 1);
216 jd = start + leapMonth;
219 //m = Math.min(m, 5);
237 * Return JD of start of given month/year of Indian Calendar
238 * @param eyear The year in Indian Calendar measured from Saka Era (78 AD).
239 * @param month The month in Indian calendar
241 int32_t IndianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */ ) const {
243 //month is 0 based; converting it to 1-based
246 // If the month is out of range, adjust it into range, and adjust the extended eyar accordingly
247 if (month < 0 || month > 11) {
248 eyear += (int32_t)ClockMath::floorDivide(month, 12, month);
257 double jd = IndianToJD(eyear ,imonth, 1);
262 //-------------------------------------------------------------------------
263 // Functions for converting from milliseconds to field values
264 //-------------------------------------------------------------------------
266 int32_t IndianCalendar::handleGetExtendedYear() {
269 if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
270 year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
272 year = internalGet(UCAL_YEAR, 1); // Default to year 1
279 * Override Calendar to compute several fields specific to the Indian
280 * calendar system. These are:
286 * <li>EXTENDED_YEAR</ul>
288 * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
289 * method is called. The getGregorianXxx() methods return Gregorian
290 * calendar equivalents for the given Julian day.
292 void IndianCalendar::handleComputeFields(int32_t julianDay, UErrorCode& /* status */) {
293 double jdAtStartOfGregYear;
294 int32_t leapMonth, IndianYear, yday, IndianMonth, IndianDayOfMonth, mday;
295 int32_t gregorianYear; // Stores gregorian date corresponding to Julian day;
298 gregorianYear = jdToGregorian(julianDay, gd)[0]; // Gregorian date for Julian day
299 IndianYear = gregorianYear - INDIAN_ERA_START; // Year in Saka era
300 jdAtStartOfGregYear = gregorianToJD(gregorianYear, 1, 1); // JD at start of Gregorian year
301 yday = (int32_t)(julianDay - jdAtStartOfGregYear); // Day number in Gregorian year (starting from 0)
303 if (yday < INDIAN_YEAR_START) {
304 // Day is at the end of the preceding Saka year
306 leapMonth = isGregorianLeap(gregorianYear - 1) ? 31 : 30; // Days in leapMonth this year, previous Gregorian year
307 yday += leapMonth + (31 * 5) + (30 * 3) + 10;
309 leapMonth = isGregorianLeap(gregorianYear) ? 31 : 30; // Days in leapMonth this year
310 yday -= INDIAN_YEAR_START;
313 if (yday < leapMonth) {
315 IndianDayOfMonth = yday + 1;
317 mday = yday - leapMonth;
318 if (mday < (31 * 5)) {
319 IndianMonth = (int32_t)uprv_floor(mday / 31) + 1;
320 IndianDayOfMonth = (mday % 31) + 1;
323 IndianMonth = (int32_t)uprv_floor(mday / 30) + 6;
324 IndianDayOfMonth = (mday % 30) + 1;
328 internalSet(UCAL_ERA, 0);
329 internalSet(UCAL_EXTENDED_YEAR, IndianYear);
330 internalSet(UCAL_YEAR, IndianYear);
331 internalSet(UCAL_MONTH, IndianMonth);
332 internalSet(UCAL_DAY_OF_MONTH, IndianDayOfMonth);
333 internalSet(UCAL_DAY_OF_YEAR, yday + 1); // yday is 0-based
337 IndianCalendar::inDaylightTime(UErrorCode& status) const
339 // copied from GregorianCalendar
340 if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) {
344 // Force an update of the state of the Calendar.
345 ((IndianCalendar*)this)->complete(status); // cast away const
347 return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
351 const UDate IndianCalendar::fgSystemDefaultCentury = DBL_MIN;
352 const int32_t IndianCalendar::fgSystemDefaultCenturyYear = -1;
354 UDate IndianCalendar::fgSystemDefaultCenturyStart = DBL_MIN;
355 int32_t IndianCalendar::fgSystemDefaultCenturyStartYear = -1;
358 UBool IndianCalendar::haveDefaultCentury() const
363 UDate IndianCalendar::defaultCenturyStart() const
365 return internalGetDefaultCenturyStart();
368 int32_t IndianCalendar::defaultCenturyStartYear() const
370 return internalGetDefaultCenturyStartYear();
374 IndianCalendar::internalGetDefaultCenturyStart() const
376 // lazy-evaluate systemDefaultCenturyStart
380 needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury);
384 initializeSystemDefaultCentury();
387 // use defaultCenturyStart unless it's the flag value;
388 // then use systemDefaultCenturyStart
390 return fgSystemDefaultCenturyStart;
394 IndianCalendar::internalGetDefaultCenturyStartYear() const
396 // lazy-evaluate systemDefaultCenturyStartYear
401 needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury);
405 initializeSystemDefaultCentury();
408 // use defaultCenturyStart unless it's the flag value;
409 // then use systemDefaultCenturyStartYear
411 return fgSystemDefaultCenturyStartYear;
415 IndianCalendar::initializeSystemDefaultCentury()
417 // initialize systemDefaultCentury and systemDefaultCenturyYear based
418 // on the current time. They'll be set to 80 years before
420 // No point in locking as it should be idempotent.
421 if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury) {
422 UErrorCode status = U_ZERO_ERROR;
424 IndianCalendar calendar(Locale("@calendar=Indian"),status);
425 if (U_SUCCESS(status)) {
426 calendar.setTime(Calendar::getNow(), status);
427 calendar.add(UCAL_YEAR, -80, status);
429 UDate newStart = calendar.getTime(status);
430 int32_t newYear = calendar.get(UCAL_YEAR, status);
435 fgSystemDefaultCenturyStart = newStart;
436 fgSystemDefaultCenturyStartYear = newYear;
440 // We have no recourse upon failure unless we want to propagate the failure
445 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndianCalendar)