Meanings
- The time zone that encompasses the states around the Rocky Mountains in the United States, and in Alberta, the cross-border city of Lloydminster and its surrounding rural municipalities in Saskatchewan, the Northwest Territories, southeastern British Columbia and the western third of Nunavut in Canada from the second Sunday of March to the first Sunday of November; it is six hours behind Coordinated Universal Time (UTC-6), and one hour ahead of Mountain Standard Time.
Synonyms: MDT
Synonyms & antonyms
proper nounThe time zone that encompasses the states around the Rocky Mountains in the United States, and in Alberta, the cross-border city of Lloydminster and its surrounding rural municipalities in Saskatchewan, the Northwest Territories, southeastern British Columbia and the western third of Nunavut in Canada from the second Sunday of March to the first Sunday of November; it is six hours behind Coordinated Universal Time (UTC-6), and one hour ahead of Mountain Standard Time.
Translations
French heure avancée des Rocheuses
- heure avancée des Rocheusestime zone
Cite this entry
Mountain Daylight Time. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Mountain%20Daylight%20Time
“Mountain Daylight Time.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Mountain%20Daylight%20Time. Accessed November 4, 2026.
WatkinsX Dictionary, s.v. “Mountain Daylight Time,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Mountain%20Daylight%20Time.
Source: Mountain Daylight Time on Wiktionary, CC BY-SA 4.0.