Sorry about that. It's published now. The reason for the date picker control is there is not one supplied in the Windows namespace for windows 8 store apps. It's not that special at the moment but it drove me nuts so I figured it's good enough to use for now until I can revise it / add more features on the weekends when I'm not at work
Feel free to use this for any of your projects I don't feel people should have to pay for such basic controls. If I do release a paid version later it'll be a separate namespace for advanced controls most likely.