Tuan ISO
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<timefyi-glossary slug="iso-week"></timefyi-glossary>Định nghĩa
He thong danh so tuan duoc xac dinh boi ISO 8601, trong do tuan bat dau vao thu Hai va tuan dau tien cua nam chua thu Nam dau tien. Mot nam co 52 hoac 53 tuan ISO.