Method decodeTimeStamp

src/common/TimeZoneUtil.cpp:745–799

}

bool TimeZoneUtil::decodeTimeStamp(const ISC_TIMESTAMP_TZ& timeStampTz, bool gmtFallback, SLONG gmtOffset,
	struct tm* times, int* fractions)
{
	bool icuFail = false;
	int displacement;

	if (timeStampTz.time_zone == GMT_ZONE)
		displacement = 0;
	else if (isOffset(timeStampTz.time_zone))
		displacement = offsetZoneToDisplacement(timeStampTz.time_zone);
	else
	{
		UErrorCode icuErrorCode = U_ZERO_ERROR;

		try
		{
#ifdef DEV_BUILD
			if (gmtFallback && getenv("MISSING_ICU_EMULATION"))
				(Arg::Gds(isc_random) << "Emulating missing ICU").raise();
#endif
			Jrd::UnicodeUtil::ConversionICU& icuLib = Jrd::UnicodeUtil::getConversionICU();

			auto icuCalendar = getDesc(timeStampTz.time_zone)->getCalendar(icuLib, &icuErrorCode);

			if (!icuCalendar)
				status_exception::raise(Arg::Gds(isc_random) << "Error calling ICU's ucal_open.");

			icuLib.ucalSetMillis(icuCalendar, timeStampToIcuDate(timeStampTz.utc_timestamp), &icuErrorCode);

			if (U_FAILURE(icuErrorCode))
				status_exception::raise(Arg::Gds(isc_random) << "Error calling ICU's ucal_setMillis.");

			displacement = (icuLib.ucalGet(icuCalendar, UCAL_ZONE_OFFSET, &icuErrorCode) +
				icuLib.ucalGet(icuCalendar, UCAL_DST_OFFSET, &icuErrorCode)) / U_MILLIS_PER_MINUTE;

			if (U_FAILURE(icuErrorCode))
				status_exception::raise(Arg::Gds(isc_random) << "Error calling ICU's ucal_get.");
		}
		catch (const Exception&)
		{
			if (!gmtFallback)
				throw;

			icuFail = true;
			displacement = gmtOffset == NO_OFFSET ? 0 : gmtOffset;
		}
	}

	const auto ticks = TimeStamp::timeStampToTicks(timeStampTz.utc_timestamp) +
		(displacement * 60 * ISC_TIME_SECONDS_PRECISION);

	TimeStamp::decode_timestamp(TimeStamp::ticksToTimeStamp(ticks), times, fractions);

	return !icuFail;
}

ISC_TIMESTAMP_TZ TimeZoneUtil::getCurrentSystemTimeStamp()
{