Ratified on January 23, 1933, the Twentieth Amendment (Amendment XX) to the United States Constitution moved the beginning and ending of the terms of the president and vice president from March 4 to January 20. It moved the start and end dates for members of Congress from March 1 to January 21. In both cases the start and end time is at noon. It also gives the procedure to follow if for some reason there is no president-elect.