The Congress may determine the Time of chusing [sic] the Electors, and the Day on which they shall give their Votes; which Day shall be the same throughout the United States.
Congress sets a national Election Day. Currently, Electors are chosen on the Tuesday following the first Monday in November, in the year before the President's term is to expire. The Electors cast their votes on the Monday following the second Wednesday in December of that year. Thereafter, the votes are opened and counted by the Vice President, as President of the Senate, in a joint session of Congress.