“I have received this afternoon a message from the Japanese Government…”
President Harry Truman, News Conference (August 14, 1945) Complete Transcript from Harry S. Truman Library and Museum
At 7 PM on August 14, 1945, President Truman told reporters gathered in the White House that Japan had surrendered. The War in the Pacific was over.
For more images and information see this post from the National Archives.