A year in the Gregorian calendar having 366 days, with the extra day, February 29, intercalated to compensate for the quarter-day difference between an ordinary year and the astronomical year.

• 闰年：格里高利历法中有366天的一年，多出的一天，用2月29日，即闰日来补偿普通年与天文年之间四分之一天的差别