Mountain Daylight Time
noun🔊/ˌmaʊntən ˈdeɪlaɪt taɪm/
🔊/ˌmaʊntn ˈdeɪlaɪt taɪm/
[uncountable] (abbreviation MDT)
the time used in summer in parts of the US and Canada near the Rocky Mountains that is six hours earlier than UTC 山区夏令时间（美国和加拿大落基山脉地区的夏季时间，比协调世界时晚六小时）