IBASE_UNIXTIME is system locale dependent

[mlazdans]

php-firebird/ibase_query.c

Lines 1392 to 1393 in 23aca98

	if (((type & ~1) != SQL_TYPE_TIME) && (flag & PHP_IBASE_UNIXTIME)) {
	ZVAL_LONG(val, mktime(&t));

Change system locale and the output changes. It should always be UTC based.

(function() {
    $ts = 1762436759; // 2025-11-06 13:45:59 UTC

    ibase_query(
        "CREATE TABLE TTEST (
            TS TIMESTAMP
        )"
    );
    ibase_commit();

    ibase_query("INSERT INTO TTEST (TS) VALUES (?)", $ts) or die("ibase_query failed");

    dump_table_rows("TTEST");
    dump_table_rows("TTEST", null, IBASE_UNIXTIME);
})();

TZ='UTC' php script.php

array(1) {
  ["TS"]=>
  string(19) "2025-11-06 13:45:59"
}
array(1) {
  ["TS"]=>
  int(1762436759)
}

TZ='Europe/Riga' php script.php

array(1) {
  ["TS"]=>
  string(19) "2025-11-06 13:45:59"
}
array(1) {
  ["TS"]=>
  int(1762429559)
}

In database these it is stored as ISC_TIMESTAMP: 60985, 495590000 which is 13:45:59

Fixing this will introduce breaking changes. Maybe put under legacy flag or something.