2024 Leap Year Or Regular. A leap year is a year that contains an extra day, 29 february (that is a thursday this year), making it 366 days long instead of the usual 365 days. A leap year is a year that contains an extra day, 29 february (that is a thursday this year), making it 366 days long instead of the usual 365 days.

During pope gregory xiii’s rule, the gregorian calendar was put into effect to essentially. Determining leap years involves a simple rule: