13 February

On 13 February 1783, the Eighth Doctor, Anji Kapoor and Fitz Kreiner finally departed from the House on Henrietta Street. The Doctor had lived there for about a year. (PROSE: The Adventuress of Henrietta Street)

In 1918, 13 February was the last date skipped in Russia's transition from the Julian to Gregorian calendars. Cousin Anastasia incorporated it into the Thirteen-Day Republic. (PROSE: The Book of the War)