there is a full call log including, if you go to messages and press alt then p it will bring it up

on the other hand, if you get multiple calls from the same person, when you click the green button select their name, and then click the trackwheel, there is an option for "view contact history" or something along those lines, that will show your call log just for that specific contact including times

another way if this is important to you is you can make a message appear in your inbox for every single call/missed call