Mountain Daylight Time (MDT) is observed in the Rocky Mountain area of USA and Canada, as well as Nayarit, Sinaloa, Baja California Sur of Mexico in Summer.
Regions observe MDT in Summer:
• USA: Colorado, Most Idaho, Most Kansas, Montana, West Nebraska,
New Mexico, South West N. Dakota, West S. Dakota, El Paso in Texas, Utah, Wyoming.
• Canada: Alberta, Northwest Territories, several counties in British Columbia.
• Mexico: Baja California Sur, Nayarit, Sinaloa.
• Get converter between Mountain Daylight Time and specific time zone:
MDT starts at 2 AM on the second Sunday in March each year, turn the clock 1 hour forward to 3 AM at that time.
MDT ends at 2 AM on the first Sunday of November each year, turn the clock 1 hour back to 1 AM at that time.