Joe Biden largely stands for not being Donald Trump. In 2016, Donald Trump mostly stood for not being Hillary Clinton, so we shall see.
Date of election:
"The Congress may determine the Time of chusing the Electors, and the Day on which they shall give their Votes; which Day shall be the same throughout the United States."
(U.S. Constitution, Article 1, Section 1.) Note that the day here mentioned is for the Electoral College to vote. In the early Republic the states held their elections at considerably varying times. In some states the electors were chosen by the legislature.
The reference to Roosevelt above presumably refers to the 20th Amendment, which moved the date of the presidential inauguration back from March to January.