How and when did the Japanese surrendered ?

The state of war between Japan and the Allies formally ended when the Treaty of San Francisco came into force on April 28, 1952. Four more years passed before Japan and the Soviet Union signed the Soviet–Japanese Joint Declaration of 1956, which formally brought an end to their state of war.

The surrender of the Empire of Japan on September 2, 1945, brought the hostilities of World War II to a close. On August 6, 1945, the United States dropped an atomic bomb on the city of Hiroshima. Late in the evening of August 8, 1945, in accordance with the Yalta agreements, but in violation of the Soviet–Japanese Neutrality Pact, the Soviet Union declared war on the Empire of Japan, and soon after midnight on August 9, 1945, the Soviet Union invaded the Imperial Japanese puppet state of Manchukuo. Later that day, the United States dropped another atomic bomb, this time on the city of Nagasaki. The combined shock of these events caused Emperor Hirohito to intervene and order the Big Six to accept the terms for ending the war that the Allies had set down in the Potsdam Declaration. After several more days of behind-the-scenes negotiations , Emperor Hirohito gave a recorded radio address to the Empire on August 15. In the radio address, called the Gyokuon-hōsō ("Jewel Voice Broadcast"), he announced the surrender of the Empire of Japan to the Allies .

On August 28, the occupation of Japan by the Supreme Commander for the Allied Powers began. The surrender ceremony was held on September 2, aboard the United States Navy battleship USS Missouri (BB-63), at which officials from the Japanese government signed the Japanese Instrument of Surrender, thereby ending the hostilities in World War II. Allied civilians and military personnel alike celebrated V-J Day, the end of the war; however, some isolated soldiers and personnel from Imperial Japan's far-flung forces throughout Asia and the Pacific islands refused to surrender for months and years afterwards, some even as far as into the 1970s. Since the surrender of the Empire of Japan, historians have continually debated the ethics of using the atomic bombs on Hiroshima and Nagasaki.

Website :  http://en.wikipedia.org/wiki/Surrender_of_Japan ( Date Accessed : 13 February 2013 )