clock...
turn the radio off, hold down the clock button, and while holding it press the 4, 5, or 6 preset buttons, they say H and M under them. once u got the time right, let go of the clock button.

SRS and seatbelt...
take it to the dealer. there's nothing u can do.

rattling...
typicall on 7th gens, the hold prop rattles, and the rear deck rattles, there's not really anything u can do. maybe dynamat the rear deck. just turn up your radio and forget about it.