Victory over Japan Day (also known as Victory in the Pacific Day, V-J Day, or V-P Day) is a name chosen for the day on which the Surrender of Japan occurred, effectively ending World War II, and subsequent anniversaries of that event. The term has been applied to both of the days on which the initial announcement of Japan’s surrender was made – to the afternoon of August 15, 1945, in Japan, and, because of time zone differences, to August 14, 1945 (when it was announced in the United States and the rest of the Americas and Eastern Pacific Islands) – as well as to September 2, 1945, when the signing of the surrender document occurred.
August 15 is the official V-J Day for the UK while the official US commemoration is September 2. The name, V-J Day, had been selected by the Allies after they named V-E Day for the victory in Europe.
On September 2, 1945, a formal surrender ceremony was performed in Tokyo Bay, Japan, aboard the battleship USS Missouri. In Japan, the day usually is known as the “memorial day for the end of the war” (終戦記念日, Shūsen-kinenbi?); the official name for the day, however, is “the day for mourning of war dead and praying for peace” (戦歿者を追悼し平和を祈念する日, Senbotsusha wo tsuitōshi heiwa wo kinensuru hi?). This official name was adopted in 1982 by an ordinance issued by the Japanese government.
August 15 is commemorated as Liberation Day in Korea.