send object

ok i made an object vandaag that contains several information $vandaag->dag = date("w"); $vandaag->dagen = date("j"); $vandaag->maand= date("n"); $vandaag->jaar= date("Y"); $vandaag->maxdag = date("t") that is on a page but i like to send this object to an other page how can i do this whit min of code my first tought was to hang it on the url Header("Location:kalender.php?vandaag=" . $vandaag ); but that don't seems to work thx in advance greetz