It appears you can still edit it using the mobile interface: http://m.facebook.com/editprofile.php?edit=birthday&type=basic http://m.facebook.com/editprofile.ph

It appears you can still edit it using the mobile interface: http://m.facebook.com/editprofile.php?edit=birthday&type=basic http://m.facebook.com/editprofile.php?edit=birthday&type... (I don't want to test if the change actually goes through, sorry.)