/*
* Override Calendar to compute several fields specific to the Indian
* calendar system. These are:
*
* <ul><li>ERA
* <li>YEAR
* <li>MONTH
* <li>DAY_OF_MONTH
* <li>EXTENDED_YEAR</ul>
*
* The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
* method is called. The getGregorianXxx() methods return Gregorian
* calendar equivalents for the given Julian day.
*/
void IndianCalendar::handleComputeFields(int32_t julianDay, UErrorCode& /* status */) {
double jdAtStartOfGregYear;
int32_t leapMonth, IndianYear, yday, IndianMonth, IndianDayOfMonth, mday;
int32_t gregorianYear; // Stores gregorian date corresponding to Julian day;
int32_t gd[3];
gregorianYear = jdToGregorian(julianDay, gd)[0]; // Gregorian date for Julian day
IndianYear = gregorianYear - INDIAN_ERA_START; // Year in Saka era
jdAtStartOfGregYear = gregorianToJD(gregorianYear, 1, 1); // JD at start of Gregorian year
yday = (int32_t)(julianDay - jdAtStartOfGregYear); // Day number in Gregorian year (starting from 0)
if (yday < INDIAN_YEAR_START) {
// Day is at the end of the preceding Saka year
IndianYear -= 1;
leapMonth = isGregorianLeap(gregorianYear - 1) ? 31 : 30; // Days in leapMonth this year, previous Gregorian year
yday += leapMonth + (31 * 5) + (30 * 3) + 10;
} else {
leapMonth = isGregorianLeap(gregorianYear) ? 31 : 30; // Days in leapMonth this year
yday -= INDIAN_YEAR_START;
}
if (yday < leapMonth) {
IndianMonth = 0;
IndianDayOfMonth = yday + 1;
} else {
mday = yday - leapMonth;
if (mday < (31 * 5)) {
IndianMonth = (int32_t)uprv_floor(mday / 31) + 1;
IndianDayOfMonth = (mday % 31) + 1;
} else {
mday -= 31 * 5;
IndianMonth = (int32_t)uprv_floor(mday / 30) + 6;
IndianDayOfMonth = (mday % 30) + 1;
}
}
internalSet(UCAL_ERA, 0);
internalSet(UCAL_EXTENDED_YEAR, IndianYear);
internalSet(UCAL_YEAR, IndianYear);
internalSet(UCAL_MONTH, IndianMonth);
internalSet(UCAL_DAY_OF_MONTH, IndianDayOfMonth);
internalSet(UCAL_DAY_OF_YEAR, yday + 1); // yday is 0-based
}
std::string mjdToGregorian(const Real mjd)
{
Real jd = mjd + 2430000;
std::string newDate = jdToGregorian(jd);
return newDate;
}
