Many people now know how to create Magic Squares, including how to create one that adds up to a total specified by a spectator.
Magic Squares became somewhat of a speciality for me, when I wrote a book on this subject as my "entrance examination" to become a Member of The Magic Circle.
It was while I was discussing Magic Squares with David Berglas, who was the President of The Magic Circle at the time, that he told me about a routine he had performed whereby a person’s birthday was included within four cells of a 4 x 4 Magic Square. (David’s Magic Square routines are detailed in the recently published book by David Britland, "The Mind & Magic of David Berglas".)
What follows is the method which I eventually discovered of creating such a Birthday Magic Square, where the top row of four cells forms a specific date (e.g. somebody’s birthday, anniversary, or perhaps Christmas Day).
Please note that this routine is now included in the latest paperback version of my full Magic Squares book, which is available via http://www.MagicSquaresBook.com/