I suppose the true birthdate could be debated, but from the *Community* perspective, it can be either the 14 or 11 year birthdate for MySQL!
*Unless* of course you are Monty or David, or one of the internal testers/users, for which May 95 may hold slightly more significance
14 Years ago: The Windows [alpha] was released January 8, 1998.
11 Years ago: The first GA version of 3.23 was released in January 2001
http://en.wikipedia.org/wiki/MySQL#Product_history
Note Monty and David first began working on MySQL in 1994, and the first internal release occurred on May 23, 1995. But, since that was all internal, January works for me.
Happy Birthday MySQL!