include ("Date.php");
$d = new Date(date('c'));
$d->convertTZByID("America/Buenos_Aires");
echo $d->format("%A, %d %B %Y %T");
// esto me devuelve Tuesday, 30 December 2008 22:58:32 [CORRECTO!!!

$d->convertTZByID("GMT-2");
echo $d->format("%A, %d %B %Y %T");
// esto me devuelve Tuesday, 30 December 2008 18:00:27 [INCORRECTO

no deberia GMT-2 devolverme lo mismo????