The Presidential Inauguration 2013 is just one year away! January 20, 2013 is a Sunday. The 20th Amendment states that the President must take the Oath of Office on January 20th. In past years when January 20th fell on a Sunday, a private swearing-in ceremony was held on that date and a public ceremony was held the following day. The last time that Inauguration Day fell on a Sunday was in 1985 for the Inauguration of Ronald Reagan. Update: The 2013 Inauguration will be held on January 21st, which is also Martin Luther King's Birthday. Read more about inaugural events in Washington DC.