“Zach Taylor (postponed from March 4 - a Sunday - to March 5)”
Wasn’t someone sworn in during this 1-day period? (I had a history teacher that said so, don’t recall every looking it up afterwards)
He can be sworn in as President anywhere at noon on January 20th. The Inauguration can be canceled if necessary. Ronald Reagan’s inaugural ceremony was canceled because of weather and done inside the capitol in 1985.
DAVID RICE ATCHISON, 1807-1886
President of the U.S. One Day
Upon the expiration of Vice President Dallas’ term, Missouri Senator Atchison was elected by his fellow senators to temporarily fill the Vice President’s role as President Pro Tempore of the Senate. As such, when President Polk’s term expired at noon on Sunday and until President Taylor was sworn in the following day, Senator Atchison was technically and legally the acting President of the United States for one day.
http://www.homeofheroes.com/presidents/inaugural/12_taylor.html