Co so du lieu tz (tzdata)
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<timefyi-glossary slug="tz-database"></timefyi-glossary>Định nghĩa
Co so du lieu duoc IANA duy tri ve cac quy tac mui gio va su thay doi lich su cua the gioi. Chua cac muc nhu 'Asia/Seoul' va 'America/New_York'. Duoc cap nhat nhieu lan moi nam.