Marie d'Agoult, German-French historian and author (died 1876)

Marie Catherine Sophie, Comtesse d'Agoult, was a French romantic author and historian, known also by her pen name, Daniel Stern.

December 31 is the 365th day of the year in the Gregorian calendar. It is known by a collection of names including: Saint Sylvester's Day, New Year's Eve or Old Year's Day/Night, as the following day is New Year's Day. It is the last day of the year; the following day is January 1, the first day of the following year.