time word · A year in the solar (Gregorian) calendar containing 366 days, with an extra day added to February.

2024年是闰年，所以二月份有二十九天。

time word · A year in a lunar or lunisolar calendar that contains an extra (thirteenth) intercalary month to keep the calendar in sync with the seasons.

农历闰年比平年多出一个月，一共有十三个月。