<human>:  I have a question about the london 2012 olympics. When did the olympics start?
<bot>: The London 2012 Olympic Games started on July 27th and ended on August 12th. The Olympic Games are an international multi-sport event, held every four years, that is organized by the International Olympic Committee (IOC). The Olympic Games are the world's largest international sporting event, and the most widely viewed sports competition in the world.