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);
}
}
/*
* ICU's Universal Time Scale is designed to be tick-for-tick compatible with
* .Net System.DateTime. Verify that this is so for the
* .Net-supported date range (years 1-9999 AD).
* This requires a proleptic Gregorian calendar because that's what .Net uses.
* Proleptic: No Julian/Gregorian switchover, or a switchover before
* any date that we test, that is, before 0001 AD.
*/
static void
TestDotNet() {
static const UChar utc[] = { 0x45, 0x74, 0x63, 0x2f, 0x47, 0x4d, 0x54, 0 }; /* "Etc/GMT" */
const int32_t dayMillis = 86400 * INT64_C(1000); /* 1 day = 86400 seconds */
const int64_t dayTicks = 86400 * INT64_C(10000000);
const DotNetDateTimeTicks *dt;
UCalendar *cal;
UErrorCode errorCode;
UDate icuDate;
int64_t ticks, millis;
int32_t i;
/* Open a proleptic Gregorian calendar. */
errorCode = U_ZERO_ERROR;
cal = ucal_open(utc, -1, "", UCAL_GREGORIAN, &errorCode);
ucal_setGregorianChange(cal, -1000000 * (dayMillis * (UDate)1), &errorCode);
if(U_FAILURE(errorCode)) {
log_err("ucal_open(UTC/proleptic Gregorian) failed: %s\n", u_errorName(errorCode));
ucal_close(cal);
return;
}
for(i = 0; i < LENGTHOF(dotNetDateTimeTicks); ++i) {
/* Test conversion from .Net/Universal time to ICU time. */
dt = dotNetDateTimeTicks + i;
millis = utmscale_toInt64(dt->ticks, UDTS_ICU4C_TIME, &errorCode);
ucal_clear(cal);
ucal_setDate(cal, dt->year, dt->month - 1, dt->day, &errorCode); /* Java & ICU use January = month 0. */
icuDate = ucal_getMillis(cal, &errorCode);
if(millis != icuDate) {
/* Print days not millis to stay within printf() range. */
log_err("utmscale_toInt64(ticks[%d], ICU4C)=%dd != %dd=ucal_getMillis(%04d-%02d-%02d)\n",
(int)i, (int)(millis/dayMillis), (int)(icuDate/dayMillis), (int)dt->year, (int)dt->month, (int)dt->day);
}
/* Test conversion from ICU time to .Net/Universal time. */
ticks = utmscale_fromInt64((int64_t)icuDate, UDTS_ICU4C_TIME, &errorCode);
if(ticks != dt->ticks) {
/* Print days not ticks to stay within printf() range. */
log_err("utmscale_fromInt64(date[%d], ICU4C)=%dd != %dd=.Net System.DateTime(%04d-%02d-%02d).Ticks\n",
(int)i, (int)(ticks/dayTicks), (int)(dt->ticks/dayTicks), (int)dt->year, (int)dt->month, (int)dt->day);
}
}
ucal_close(cal);
}
