The Constitution doesn't specify exactly when a President's term expires. It merely states that the President "shall hold his office during the term of four years"; it doesn't say his term expires precisely at noon four years from the date of his (scheduled) swearing-in. Not until 1933 was the Constitution amended to specify the exact date and time at which a President's term expires:
Amendment XX (1933)
Section 1. The terms of the President and Vice President shall end at noon on the 20th day of January, and the terms of Senators and Representatives at noon on the 3d day of January, of the years in which such terms would have ended if this article had not been ratified; and the terms of their successors shall then begin.
The incoming Vice-President is always sworn in before the incoming President, and sometimes this swearing-in doesn't take place until after noon, but nobody (seriously) claims that these Vice-Presidents technically "became" President during the brief interregna between their inaugurations and those of the incoming Presidents. Also, re-elected incumbent Presidents have deferred being sworn in for their second terms when their inaugural days fell on Sunday (such as James Monroe in 1821), but nobody claims the USA went without a President for one day between their terms.
He becomes President at 12:00 noon.
No. The president-elect becomes president at 12 (noon) regardless of circumstances.
The President-Elect and Vice-President-Elect take the Oath of Office and begin their terms on the 20th of January following their election at 12 noon, as directed by the 20th Amendment to the U.S. Constitution. The Amendment didn't specify a time zone, but it always takes place at noon of Washington's local standard time, which in January is American Eastern Standard Time (UTC - 5 hours).
No he must be sworne in. By me
The ceremony begins at 10:30 CST, so President Obama will be sworn in at approximately 11:00 A.M. CST.
The inauguration occurs at about 12:00 p.m., on January 20. President Obama was sworn in at 12:05 p.m. EST on January 20,02009. A second oath was administered on the evening of January 21, 2009, because Chief Justice John Roberts erred when he administered the oath causing President Obama to incorrectly recite the oath.
Amendment XX of the U.S. Constitution establishes noon (local time) on January 20th as the time for swearing in.
The president of the USA remains in power and control until noon on 20th January. The president-elect does not take over as president until (1) taking the oath of office and (2) waiting until 1 heartbeat after 12 noon on inauguration day.
Yes - the President-Elect officially becomes President at 12 PM EST January 20th, whether or not he has taken the Oath of Office. So Barack Obama was officially the President at noon, a full five minutes before he took the Oath.
12:05 p.m.
April 12, 1945
Amendment #12