Former President Jimmy Carter in September 2018.Scott Cunningham/Getty ImagesThe US stock market will close on January 9 to honor former President Jimmy Carter.President Biden declared January 9 a national day of mourning for Carter's state funeral.Carter, a Navy veteran and humanitarian, served as president from 1977 to 1981.The US stock market will close on January 9 in honor of Jimmy Carter.The 39th President of the United States died on Sunday at 100 years old.President Biden declared January 9 as a national day of mourning for Carter.