DST (Giờ Mùa Hè)
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<timefyi-glossary slug="dst"></timefyi-glossary>Định nghĩa
Hoạt động đẩy đồng hồ lên một giờ trong những tháng ấm hơn để kéo dài ánh sáng ban chiều. Khoảng 70 quốc gia áp dụng DST.