Function datetime_to_text

src/common/cvt.cpp:2287–2429

static void datetime_to_text(const dsc* from, dsc* to, Callbacks* cb)
{
/**************************************
 *
 *       d a t e t i m e _ t o _ t e x t
 *
 **************************************
 *
 * Functional description
 *      Convert a timestamp, date or time value to text.
 *
 **************************************/
	bool version4 = true;

	fb_assert(DTYPE_IS_TEXT(to->dsc_dtype));

	// Convert a date or time value into a timestamp for manipulation

	bool tzLookup = true;
	tm times;
	memset(&times, 0, sizeof(struct tm));

	int	fractions = 0;
	USHORT timezone;

	switch (from->dsc_dtype)
	{
	case dtype_sql_time:
		Firebird::TimeStamp::decode_time(*(GDS_TIME*) from->dsc_address,
			&times.tm_hour, &times.tm_min, &times.tm_sec, &fractions);
		break;

	case dtype_sql_time_tz:
	case dtype_ex_time_tz:
		tzLookup = TimeZoneUtil::decodeTime(*(ISC_TIME_TZ*) from->dsc_address,
			true, TimeZoneUtil::NO_OFFSET, &times, &fractions);
		timezone = ((ISC_TIME_TZ*) from->dsc_address)->time_zone;
		break;

	case dtype_sql_date:
		Firebird::TimeStamp::decode_date(*(GDS_DATE *) from->dsc_address, &times);
		break;

	case dtype_timestamp:
		cb->isVersion4(version4); // Used in the conversion to text some lines below.
		Firebird::TimeStamp::decode_timestamp(*(GDS_TIMESTAMP*) from->dsc_address, &times, &fractions);
		break;

	case dtype_timestamp_tz:
	case dtype_ex_timestamp_tz:
		cb->isVersion4(version4); // Used in the conversion to text some lines below.
		tzLookup = TimeZoneUtil::decodeTimeStamp(*(ISC_TIMESTAMP_TZ*) from->dsc_address,
			true, TimeZoneUtil::NO_OFFSET, &times, &fractions);
		timezone = ((ISC_TIMESTAMP_TZ*) from->dsc_address)->time_zone;
		break;

	default:
		fb_assert(false);