On the old Communicator and well just about every other phone... the delivery Reports tell you the time and date deliverd!
Is it just me being dumb or does the 9210 not actualy show the delivered time and date, just the sent time and date?????
Delivery Report
Unfortunatelly, u r right. This guy tells u it's pending/failed/delivered but doesn't tell u when...unless i'm missing something. Oh, well, u can always keep watching the phone display cause it shows a 1 sec msg telling u it was delivered; WHEN IT DOES 
...if u record that time, that's it!
So, it is EASLY possible for Nokia to do it, but they just didn't...i once thought about writting a small progie to record that, but i haven't written anything for Crystal before, so it was tough for me to start.
Maybe the author of SMSAssistant can easily do it, cause his prog does most of what's required, he just has to add a listener to "Delivery Report" type msgs.