As promised here is my edit (See attached below). Please note that I only edited a few minor UI things, nothing special or functional.
A few of the colors are slightly different to my screenshot, mainly due to, the app I posted screenshot from uses a Custom Light theme, so default texts are dark. Applying that to the sample would just complicate matters.
Anybody that uses Erel original class files, one thing I would add to the DatePicker designer layout script is:
Add
Code:
Base.Height = Min(300dip, 100%y)
Just after
If Erel agrees with this, maybe he will update the original for those that don't read past post #1

On my phone 480x800 I found that the bottom of the date picker would be cropped slightly in landscape mode. Adding the above line solves that issue.
Updated to reflect Erels update to DateUtils (now v1.03)
Thanks again Erel, great class.