How and when the Japanese surrendered

The first atomic bomb, code-named "Little Boy", struck Hiroshima, Japan's eighth largest city. It was dropped from an American B-29 bomber named Enola Gay, piloted by Colonel Paul W. Tibbets. The bomb destroyed almost all building structures and killed more than 100,000 people. 
The second atomic bomb, code-named "Fat Boy", was dropped on Nagasaki, the third largest city of Kyushu from another American B-29 bomber named Bock's Car, piloted by Major Charles W. Sweeney. It had the same effect as the first bomb, only this time the number of people killed was about 35,000 people.Due to the large amount of people lost, the japanese decided to make a radio announcement to his people announcing the decision to accept the Potsdam Proclamation and surrender to the Allies .Emperor Hirohito issued a decree ordering all Japanese forces to demobilise and cease operation.2 Sep 1945: At 9:00 am, The Instrument of Surrender was signed on board the American battleship, Missouri, in Tokyo Bay, officially ending the WWII.http://infopedia.nl.sg/articles/SIP_123_2005-02-03.html