Which U.S. president announced the formal V-J Day date as September 2, 1945?

President Harry S. Truman announced September 2, 1945, as the official V-J Day in the United States.

Truman became president after Franklin D. Roosevelt died in April 1945. During Truman's presidency, the United States fought the final months of the Pacific War, used atomic bombs against Hiroshima and Nagasaki, and accepted Japan's surrender announcement.

The American government received notice of Japan's decision on August 14, 1945, in Washington time. Truman announced the news to the American public but emphasized that the formal proclamation of V-J Day would wait until Japan signed the surrender terms. That signing occurred aboard USS Missouri in Tokyo Bay on September 2.

Other countries used different dates. Japan and the United Kingdom commonly associated V-J Day with August 15, while the United States officially used September 2. The difference reflects the gap between Japan's radio announcement and the later legal surrender ceremony, as well as international time-zone differences.