What year is leap February?

By 2023, the last leap in February was in 2004.

Leap February generally occurs once every 19 years, and the years of leap February are 1928, 1947, 2004, 2023, 2042, 2 137, 2 186.

Leap February is a Gregorian calendar that occurs every four years. February 29th is leap February. There are two February in the lunar calendar year, and the second February is a leap February. It is because the appearance of the sun and the moon is not caused by the number of days for the earth's rotation. Leaping into February is to prevent the lunar calendar from being out of touch with the tropic year, that is, the four seasons, because the next month after February of the lunar calendar has only solar terms, and Grain Rain after Qingming is postponed to next month, so there will be a month without neutral atmosphere after February. So the month without neutral atmosphere after February is named "leap February" after February, which is the reason for leap February.