The 20th Amendment to the Constitution, which changed the beginning of a Presidential term from March 4 to January 20, was ratified in 1933, and took effect for President Franklin D. Roosevelt’s second term in 1937.
Inauguration Day, normally on January 20, falls on a Sunday this year. Only six times in the nation's history has the constitutionally-mandated date for a Presidential Inauguration fallen on a Sunday. January 20, 2013 will be the seventh time, and following historical precedent, the public ceremony will be held at the U.S. Capitol on Monday, January 21, 2013. In a tradition that dates back to 1917, the White House will likely arrange a private swearing in before noon on January 20, 2013.