OK , now that you have posted lies again, here is the truth. If a newly elected president takes over at noon then they would have to take the oath and be sworn in before noon, you idiot..... Get the real facts or go back to your real country !!!!!!!
The 20th amendment specifies when a President's term starts and ends:
The terms of the President and Vice President shall end at noon on the 20th day of January ...; and the terms of their successors shall then begin
Article 2 (Section 1) of the Constitution describes the oath/affirmation requirement:
Before he enter on the Execution of his Office, he shall take the following Oath or Affirmation...
The two requirements allow for the President to be sworn in before hand. There is no specific time mandated for the inauguration to occur, and nothing preventing it from happening more than once.