Pacific Daylight TimeBrE /pəˌsɪfɪk ˈdeɪlaɪt taɪm/ 🔊NAmE /pəˌsɪfɪk ˈdeɪlaɪt taɪm/ 🔊 noun [uncountable] (abbreviation PDT) the time used in summer in the western parts of Canada and the US that is seven hours behind UTC 太平洋夏令时间（加拿大西部和美国西部的夏季时间，比协调世界时晚七个小时）