when did japan surrender ww2

Japan surrendered in World War II officially when the Japanese representatives signed the Instrument of Surrender aboard the USS Missouri in Tokyo Bay on September 2, 1945. This formal signing by Japanese envoys marked the official end of World War II. Prior to this, on August 15, 1945, Emperor Hirohito announced Japan's surrender in a radio broadcast, which is often considered the effective end of the war in Japan. The signing ceremony on September 2 included Allied representatives and formally ended hostilities.