The Constitution set the date for Congress to convene — Article 1, Section 4, Clause 2, originally set that date for the third day of December. The Twentieth Amendment, however, changed the opening date for sessions to noon on the third day of January, unless they shall by law appoint a different day. The Twentieth Amendment also states that Congress shall assemble at least once in every year and allows Congress to determine its convening and adjournment dates and other dates and schedules as it desires.