Tee shirts advertising the 12-12-12 date sit on display at A Little White Wedding Chapel, Tuesday, Dec. 11, 2012, in Las Vegas. These “once-in-a-century” wedding dates have become more important each year as people increasingly look outside Vegas for nontraditional weddings. Once known as the wedding capital of the world, Vegas' share of the U.S. wedding market has fallen by a third since 2004. (AP Photo/Julie Jacobson)
People all around the world mark the rare date of 12/12/12.