What day is leap February 14th?

February 14 is the Cold Food Festival.

The origin of the Cold Food Festival is controversial in the study of history and folklore, among which the most discussed are: the theory of forbidding fire, the theory of changing fire and the theory of deduction. The theory of forbidding fire holds that the origin of Cold Food Festival originated from the system of forbidding fire in Zhou Dynasty, which first appeared in Shi Si, Zhou Li, and the "fire" of forbidding fire was Mars. Because stars play an important role in people's lives, based on the worship of stars, banning fire has become a ritual for people to sacrifice to Mars.