Convert combobox user input in to date with tkinter

[Ame]

Thank you, it worked! I'm very happy: I've finish my first app thanks to you. I've only a couple of question, but they are really just about style, you've already help me a lot so don't mind me if I bother you too much. My questions are:
Is there a way to have a leading zero on the day of the month? Basically add it in this part.

 d29 = list(range(1, 30))
        d30 = list(range(1, 31))
        d31 = list(range(1, 32))

And also is there a way to format the date without all the zero? From this 01/01/2000 00:00:00 to this 01/01/2000.
Once again, you help me a lot! Thank you