Clock for my bike

So ive been riding a lot since i got my license and have been on the road a few times and thought to myself what the hell is the time! Why the hell doesn't my bike have a clock... Then i thought to myself lets put one one.... Any one done this before best way to go about? Hardwired or just a small one with batteries! Thinking digital with a back light so it works at night obviously! Im not so tech savvy so wiring will be difficult for me! So the battery option is probs easier unless someone can help me wire it? If so where can i get this sort of stuff???