First inauguration of Harry S. Truman
The first inauguration of Harry S. Truman as the 33rd president of the United States was held at 7:09 pm on Thursday, April 12, 1945, at the Cabinet Room inside the White House in Washington, D.C., following the death of President Franklin D. Roosevelt earlier that day. The inauguration—the seventh non-scheduled, extraordinary inauguration to ever take place—marked the commencement of the first term (a partial term of 3 years, 283 days) of Harry S. Truman as president.
Source: Wikipedia — First inauguration of Harry S. Truman (CC BY-SA 4.0)