April 12, 1945
THE WORLD may be sure that we will prosecute the war on both fronts, east and west, with all the vigor we possess to a successful conclusion.
Note: The oath of office was administered by Chief Justice Harlan F. Stone at 7:09 p.m. in the Cabinet Room at the White House. Shortly thereafter the President announced through an assistant that the United Nations Conference would be held in San Francisco on April 25 as President Roosevelt had directed.
The foregoing statement was released at 8:10 p.m.
Harry S Truman, Statement by the President After Taking the Oath of Office. Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/231412