On what date did the Japanese Instrument of Surrender become formal at the USS Missouri ceremony?

The Japanese Instrument of Surrender became formal at the USS Missouri ceremony on September 2, 1945.

The document was signed in Tokyo Bay shortly after 9 a.m. Japan Standard Time. It formalized the capitulation of the Japanese government and ended hostilities between Japan and the Allied powers. The ceremony followed the August 15 announcement made by Emperor Hirohito, so the two dates represent different stages of surrender.

Mamoru Shigemitsu signed first for the Japanese government, followed by General Yoshijirō Umezu for Imperial General Headquarters. General Douglas MacArthur signed for the Allied nations, and Admiral Chester Nimitz signed for the United States. Representatives of China, the United Kingdom, the Soviet Union, Australia, Canada, France, the Netherlands, and New Zealand also signed.

The ceremony took place two days after occupation forces began entering Japan. Separate surrender ceremonies followed in other regions, including the Philippines, Korea, and Southeast Asia. The signed documents are held by the U.S. National Archives in Washington, D.C.