<p>Here’s a link to the deadlines page: [U</a> of I Admissions: Dates & Deadlines](<a href=“http://admissions.illinois.edu/apply/dates.html]U”>Page Not Found, Illinois Undergraduate Admissions)</p>
<p>Given that it says applications must be postmarked January 3, it would seem January 2 means anytime before January 2 expires, which means up to 11:59:59 p.m. Presumably CENTRAL time but maybe play it safe and call it Eastern (which is how the CommonApp works).</p>