This app was mentioned in 1 comment, with an average of 2.00 upvotes
I would recommend adding some color to the action bar, notification shade, and slide out menu. It looks really nice, but the color would make it look twice as better. Something like this would be an excellent example (I recommend yellow or another school color is used).
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Also, if you wanted to add a FAB for a more material look, you could use the calendar picker for that. Besides that, it looks great! The one on the play store has a very outdated UI in comparison so great job!
Edit: Thanks for the free app btw, it works great!