On what date did Japan’s formal surrender ceremony aboard USS Missouri take effect in 1945?

Japan’s formal surrender ceremony aboard USS Missouri took effect on September 2, 1945.

The Japanese Instrument of Surrender was signed in Tokyo Bay just after 9 a.m. Japan Standard Time and became effective at about 9:25 a.m. The document formalized Japan’s capitulation and ended the hostilities of World War II in the Pacific.

The date can be confusing because Japan’s surrender unfolded in stages. Emperor Hirohito’s recorded announcement was broadcast on August 15, while the United States often referred to August 14 because the news arrived there on the previous calendar date. September 2 is the date of the signed instrument and the ceremony attended by the Allied representatives.

The ceremony included signatures from Japan’s civilian government and armed forces, followed by representatives of nine Allied countries. General Douglas MacArthur presided, and the event was witnessed by a large Allied naval presence in Tokyo Bay. The signed document is therefore the clearest basis for identifying September 2 as the formal legal date of surrender.