i have a question,

when i am going to multiply with 26 to 31 it makes cookie file. in browser's(IE) menu tools->internetoption->settings->viewfile

thiws code works properly
<?php
setcookie("user", "hello", time() + (86400 * 26), "/" );
?>

but when i am going to multiply with less than 26 it does not make any cookie file. in browser's(IE) menu tools->internetoption->settings->viewfile

this code shows Problem
<?php
setcookie("user", "hello", time() + (86400 * 24), "/" );
?>
can any one help my or tell me why this happening?

Thanks In advance