on the twentieth day of January following their election
All US presidents take the oath of office, starting with the first president, George Washington.
No, he used the Bible to take his oath of office.
The oath is the last sentence of section 1, Article II.
They take their presidential oaths at Capitol Hill, at their inauguration.
I do not think that any take an oath- possibly they do in some religious colleges.
First he has to be legally elected as President or else become president by succession. Second he must be "sworn in" by taking the oath of office before a person who is legally qualified to administer oaths.
Oath of Office
Yes-congressmen take an oath of office before they begin work.
No, they usually take it in front of the Capitol building. Some have taken it in the White House and one even on an airplane.
American presidents who are re-elected are required to repeat the oath of office.
New US presidents take the oath of office and become President at noon on January 20, of the year following the election.
"So help me God" has been added by many of the Presidents.