CFDateRef CFCalendarCopyGregorianStartDate(CFCalendarRef calendar) {
CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), CFDateRef, calendar, _gregorianStartDate);
__CFGenericValidateType(calendar, CFCalendarGetTypeID());
if (!calendar->_cal) __CFCalendarSetupCal(calendar);
UErrorCode status = U_ZERO_ERROR;
UDate udate = calendar->_cal ? ucal_getGregorianChange(calendar->_cal, &status) : 0;
if (calendar->_cal && U_SUCCESS(status)) {
CFAbsoluteTime at = (double)udate / 1000.0 - kCFAbsoluteTimeIntervalSince1970;
return CFDateCreate(CFGetAllocator(calendar), at);
}
return NULL;
}
RSExport RSDateRef RSCalendarCopyGregorianStartDate(RSCalendarRef calendar) {
RS_OBJC_FUNCDISPATCHV(RSCalendarGetTypeID(), RSDateRef, calendar, _gregorianStartDate);
__RSGenericValidInstance(calendar, RSCalendarGetTypeID());
if (!calendar->_cal) __RSCalendarSetupCal(calendar);
UErrorCode status = U_ZERO_ERROR;
UDate udate = calendar->_cal ? ucal_getGregorianChange(calendar->_cal, &status) : 0;
if (calendar->_cal && U_SUCCESS(status)) {
RSAbsoluteTime at = (double)udate / 1000.0 - RSAbsoluteTimeIntervalSince1970;
return RSDateCreate(RSGetAllocator(calendar), at);
}
return nil;
}
void CFCalendarSetGregorianStartDate(CFCalendarRef calendar, CFDateRef date) {
CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), void, calendar, _setGregorianStartDate:date);
__CFGenericValidateType(calendar, CFCalendarGetTypeID());
if (date) __CFGenericValidateType(date, CFDateGetTypeID());
if (!calendar->_cal) __CFCalendarSetupCal(calendar);
if (!calendar->_cal) return;
if (!date) {
UErrorCode status = U_ZERO_ERROR;
UCalendar *cal = __CFCalendarCreateUCalendar(calendar->_identifier, calendar->_localeID, calendar->_tz);
UDate udate = cal ? ucal_getGregorianChange(cal, &status) : 0;
if (cal && U_SUCCESS(status)) {
status = U_ZERO_ERROR;
if (calendar->_cal) ucal_setGregorianChange(calendar->_cal, udate, &status);
}
if (cal) ucal_close(cal);
} else {
CFAbsoluteTime at = CFDateGetAbsoluteTime(date);
UDate udate = (at + kCFAbsoluteTimeIntervalSince1970) * 1000.0;
UErrorCode status = U_ZERO_ERROR;
if (calendar->_cal) ucal_setGregorianChange(calendar->_cal, udate, &status);
}
}
