<p>I got an email yesterday saying that they had not received my upadte, so my guess is that if you dont receit such email, your update is acknowledged.</p>
<p>I believe, correct me if I'm mistaken, that if you log into the update site after submitting the update at least once it will indicate the date of last submission. This is also a verification that you have submitted the update before.</p>
<p>Yes, what UCD Admissions said is correct. It lists the "last date of submission."</p>
<p>You can also log into the UC Application Status website and check there; it has a little box--i think it was under personal information--that will have a question mark if the update was not received OR it will have a date of submission if it was received successfully.</p>