Central Daylight TimeBrE /ˌsentrəl ˈdeɪlaɪt taɪm/ 🔊NAmE /ˌsentrəl ˈdeɪlaɪt taɪm/ 🔊 noun [uncountable] (abbreviation CDT) the time used in summer in the central US and Canada, which is five hours behind UTC 中部夏令时（美国中部和加拿大中部的夏令时，比协调世界时晚五小时）