
Find your's at MyPiDay.com 
Stumbled upon a website today which helps you find a Pi Value for your birthday. My first thought; they're either really silly or just trying to be smart asses.
There is definitely a precise answer to this question (for each particular format, eg DDMMYYYY), and it wouldn't even be hard to compute. We know that because there is a finite number of possible birthdays (as people must be born prior 2016 and you can't have negative/BC dates), and Pi obviously has every eight digit number.
This one is mine: 01061993