I like making note of projects like these not only for future use but also inspiration and education. Date pickers seem to go through seasons, and it’s as though they’re on an upswing lately with a few new repos cropping up.
I like the UI of this, but one thing I’d try to work out is a way to more easily navigate through years. While I wouldn’t consider it ‘common’ usage, that one time you need to do it and the date picker doesn’t let you results in a lot of frustrating clicks. I’ll add that to my ever-growing list of things for which I’d like to submit a pull request.