I enjoy watching many TV shows and movies. As of 2014, I have started using Trakt to keep track of all the movies and TV shows I have watched.
Trakt allows you to set a show as "watched", which means it will start appearing on your own, customized calendar. Trakt isn't particularly useful if you only watch a single show a week. But if you're like me and watch close to 25 TV shows, then Trakt might be a nice service for you. Trakt is free, with optional premium membership (monthly or annual renewal) which unlocks some extra features.