A leap year has 366 days, as opposed to a common year, which has 365. Nearly every 4 years is a Leap Year, and we add a Leap Day, an extra – or intercalary – day on February 29.
Year 2016 is a leap year, with 366 days. The latest prior leap year occurred in 2012 and the next will be in 2020. The reason for the leap year is to reconcile the earth’s orbit around the sun.
By adding days to the year the seasons stay in step with the month’s for each year.
Leap Day 2016 is on Monday, February 29