Which amendment of the United States Constitution set the term dates for the President and Congress?

The presidential term was set to begin/end on January 20 (from March 4) and the congressional term on January 3 (also from March 4). The Twentieth Amendment reduced the "lame duck" period, aka their remaining service after an election.

Asked by Darrell Rowe · Last updated 3 years ago · 15.6K views · SOURCE