asp.net calendar control to select a date, attach that date to a url prefix, then navigate to it

All of my posts to my blog are tagged with a date (example: YYYY/MM/DD) I'm using Blogengine.net 2.0 to create the tags for each post. I would like to have a calendar displayed on the site where when you click on a date it navigates to the url: http://www.postgat.com/?tag=/ plus the date that was selected. So this would give you something like: http://www.postgat.com/?tag=/2011/05/31 Then all posts related to that date will be displayed. Anyone have any ideas how to get started? What kind of things I should search for? Any links?
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