On what date was Japan's Instrument of Surrender formally signed?

Japan's Instrument of Surrender was formally signed on September 2, 1945.

Representatives of Japan and the Allied powers signed the document aboard USS Missouri in Tokyo Bay. The ceremony began shortly after 9 a.m. Japan Standard Time, and the instrument took effect at 9:25 a.m. The signing formally ended Japan's participation in World War II and concluded the Allied war against Japan.

Japan's surrender unfolded across several dates, which can cause confusion. Hirohito's recorded announcement was broadcast in Japan on August 15, while the United States received the news on August 14 because of time-zone differences. September 2 was the formal documentary and ceremonial conclusion.

Mamoru Shigemitsu signed for the Japanese government, followed by General Yoshijirō Umezu for Imperial General Headquarters. Douglas MacArthur signed for the Allied powers, followed by representatives from the United States, China, the United Kingdom, the Soviet Union, Australia, Canada, France, the Netherlands, and New Zealand.