Lich Gregorian phan chieu nguoc
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<timefyi-glossary slug="proleptic-gregorian-calendar"></timefyi-glossary>Định nghĩa
Mo rong lich Gregorian den truoc ngay gioi thieu chinh thuc vao nam 1582. Duoc su dung trong cac tinh toan lich su va thien van de tranh khoang trong. ISO 8601 su dung lich Gregorian phan chieu nguoc.