Lich su gio mua he
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<timefyi-glossary slug="daylight-saving-time-history"></timefyi-glossary>Định nghĩa
Lan dau tien duoc Benjamin Franklin de xuat vao nam 1784 va duoc thuc hien rong rai trong The chien thu nhat de tiet kiem nhien lieu. Nhieu quoc gia da bai bo no; Han Quoc su dung no trong thoi gian ngan nam 1948-1951 va 1955-1960.