366 days - bissextile year - intercalary year - leap year

In the Gregorian calendar: 
any year divisible by 4 except centenary years not divisible by 400

The complete list of leap years for the 21st century is; 2004, 2008, 2012, 2016, 2020, 2024, 2028, 2032, 2036, 2040, 2044, 2048, 2052, 2056, 2060, 2064, 2068, 2072, 2076, 2080, 2084, 2088, 2092, 2096.
(Note 2000 was a leap year but correctly belongs in the 20th century, and 2100 is not a leap year as it is not divisible by 400)

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