Japan announced its surrender six days after the Nagasaki bombing in 1945.
The United States dropped the atomic bomb Fat Man on Nagasaki on August 9, 1945. Emperor Hirohito’s recorded surrender message was broadcast to Japan on August 15, making the interval six calendar days. The announcement came after Japan had also faced the Soviet Union’s declaration of war and invasion of Japanese-held Manchuria.
The timeline contains several different milestones. Hiroshima was bombed on August 6, Nagasaki was bombed on August 9, Japan accepted the Allied terms on August 10, and the emperor recorded his address on August 14 for broadcast the next day. The formal surrender document was not signed until September 2.
Because the Soviet entry into the war occurred between the two bombings and the broadcast, historians debate how much each factor influenced Japan’s decision. The six-day interval itself is a fixed chronological fact, not a claim that one event alone caused surrender.