I understand that the birthday feature with Constant Cotnact can be a little troublesome as it is now. I'm sorry about that. We are always working on improving things. If you could please leave your feedback in our Contact Management and Reporting Feedback area I think that this idea would be very popular. I know that other customers have wanted to see this functionality as well.
Also, I know this is not a solution, but you could make your Custom Field, Birthday - Please enter 00/00/0000: That way customers will see that's how it should be being entered. That might be a temporary work around until this feature hopefully gets added. However, I definitely suggest you leave your feedback.
Thank you so much!
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