php cookie中的到期时间不起作用

I have a declaration like this:

setcookie("cookieName", "cookieValue", time() + (3600 * 24 * 2));

When I take a look on Google Chrome the Expiration time its 30 minutes ago! And in Firefox its now + 30 minutes...

I can't understand this weird behaviour.

Someone can help me please?

Thanks a lot

Sorry, its my fault.

I haven't see that setcookie is called after headers have been sent.

Thanks!