FILE - Britain's Queen Elizabeth II rides in a carriage along the Mall during the Trooping The Colour parade at Buckingham Palace, in London, Saturday, June 11, 2016. Elizabeth was born on April 21, 1926, but it was sometimes confusing for the public to know when to celebrate. There was no universally fixed day for her “official birthday”: It’s either the first, second or third Saturday in June, and was decided by the government. (AP Photo/Tim Ireland, File)