and where is the in game clock, I go to my map and it tells me my time. for example yesterday I wanted to find a vampire, and I heard 12 o clock In game time is the best time to find them, I was playing late and it was 2:00am real time, but in tamriel it was sunny and seemed like the afternoon, not 2:00am, which is what it said on the map

Nope more like 6 hours for a full cycle. 4 hours for day and 2 for night.