13 February

13 February was a date.

Events
In 13,500,017,093 BC, the beginning of the universe occurred at 11 am. (PROSE: Time Traveller's Diary)

In 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 2174, the Uvodni took Tivoli and liberated it from the Ogrons. As with the Ogrons, the Uvodni invaders were welcomed as heroes by the native Tivolians. (PROSE: Time Traveller's Diary)

Other
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)