Nam Nhuan
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<timefyi-glossary slug="leap-year"></timefyi-glossary>Định nghĩa
Nam co 366 ngay thay vi 365, them ngay 29 thang 2. Xay ra moi 4 nam, ngoai tru cac nam chia het cho 100 nhung khong chia het cho 400 (vi du: nam 2000 la nam nhuan, nam 1900 thi khong).