What makes June 17 so special?

Something interesting in today's "Harrisburg Online," the daily Greenlee Partners bulletin: Saturday, June 17, is the shared birthday of PA Attorney General Tom Corbett, Congressman Jack Murtha and our friend Tom Meinert at William J. Green & Associates. Greenlee Partners didn't mention this but, according to Wikipedia, Saturday is also the birthday of Newt Gingrich and Venus Williams.