윤년
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<timefyi-glossary slug="leap-year"></timefyi-glossary>정의
365일 대신 366일인 해로, 2월 29일이 추가됩니다. 4년마다 돌아오지만, 100으로 나눌 수 있되 400으로 나눌 수 없는 해는 예외입니다 (예: 2000년은 윤년, 1900년은 아님).