I am currently porting a large application over to a HTML5 based web app - I have started building the app in AngularJS and enjoying the power of the AngularJS framework - I
First off, it's great that you are using angularjs, its a sweet framework. An offshoot project was started awhile back to deal with things like wrapping jquery-ui and creating ui modules.
Below is link to Peter Bacon Darwin's implementation.
https://github.com/angular-ui/angular-ui/tree/master/modules/directives/date
--dan