I suggest you to take a lookbelow link that explains how to crate an excel
add-in for date  inputs via pop up calnedar
http://www.fontstuff.com/vba/vbatut07.htm
At the end of the article, you will find two download links for explained
add-in. I also put one of the mentioned links hereunder.
http://www.fontstuff.com/downloads/Excel%20Calendar%20Add-In.zip

I hope this is waht are you looking for...or....may be more...