This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
The jQuery date picker is rather nice and very easy to use. It instruments a normal input text field so dealing with it on the server is the same as dealing with any other text field. The date format can be specified to be anything you want.