London 2012 Olympics Countdown clock in Trafalgar Square

The Summer Olympics begins Friday, July 27, 2012, and ends Sunday, August 12, 2012.

  A countdown clock in Trafalgar Square was unveiled, 500 days before the games. The clock broke down the following day. The same location hosted one of a number of events to mark a year before the games. Final countdown to the start of this year's summer games in London has begun with the ceremony of lighting of Olympic flame in Ancient Olympia in Greece.