Current Time in MST7MDT Time Zone

Where MST7MDT Applies and Who Uses It

MST7MDT is the canonical zone for most of the Mountain Time Zone that follows daylight saving time. It covers large parts of the United States and Canada, including the states of Colorado, Montana, New Mexico, Utah, Wyoming, and the western portions of Kansas, Nebraska, South Dakota, and Texas. In Canada, it includes Alberta, the Northwest Territories (most), and the eastern part of British Columbia (the Peace River region). Major cities in this zone are Denver, Salt Lake City, Albuquerque, Calgary, Edmonton, and El Paso. The zone is also used by the Navajo Nation (which observes DST) but not by the Hopi Reservation (which stays on MST year-round).

Offset and Abbreviation Meaning

Standard time is Mountain Standard Time (MST), which is 7 hours behind Coordinated Universal Time (UTC-07:00). When daylight saving is in effect, clocks shift forward by one hour to Mountain Daylight Time (MDT), UTC-06:00. The abbreviation MST stands for Mountain Standard Time, and MDT for Mountain Daylight Time. The zone name MST7MDT encodes the standard offset (MST is 7 hours behind UTC) and the fact that it observes daylight saving time (MDT).

Daylight Saving Behaviour and Yearly Rhythm

MST7MDT observes daylight saving time every year from the second Sunday in March to the first Sunday in November. In 2025, clocks spring forward to MDT on March 9 at 2:00 AM local time (becoming 3:00 AM) and fall back to MST on November 2 at 2:00 AM (becoming 1:00 AM). In 2026, the dates are March 8 and November 1. This pattern is consistent across the zone, though some locations (like most of Saskatchewan) do not observe DST and remain on CST or MST year-round. The shift means that during summer, the region aligns with Central Time (UTC-06:00) and during winter it aligns with Pacific Time (UTC-08:00) for part of the day.

Main Countries and Cities

The zone is used in the United States and Canada. Key US cities: Denver (Colorado), Salt Lake City (Utah), Albuquerque (New Mexico), Phoenix (Arizona) does NOT use MST7MDT – Arizona is on MST year-round except for the Navajo Nation. In Canada: Calgary and Edmonton (Alberta), Yellowknife (Northwest Territories). The zone also covers the Mexican state of Baja California Sur? No, that is UTC-07:00 without DST. The Mexican state of Sonora uses MST year-round (no DST), and the state of Chihuahua uses MST with DST but is in America/Ciudad_Juarez. MST7MDT is primarily US and Canadian.

Business Hours Overlap and Scheduling Calls

MST7MDT is 2 hours behind Eastern Time (ET) and 1 hour ahead of Pacific Time (PT). During standard time (MST), the zone is UTC-07:00; during daylight time (MDT), it is UTC-06:00. For international calls: London is 7 hours ahead of MST (so 9 AM MST = 4 PM GMT) and 6 hours ahead of MDT (9 AM MDT = 3 PM BST). Tokyo is 16 hours ahead of MST (9 AM MST = 1 AM next day JST) and 15 hours ahead of MDT. Sydney is 18 hours ahead of MST (9 AM MST = 3 AM next day AEDT) and 17 hours ahead of MDT. Best overlap with Europe is late morning MST (10 AM-12 PM) which is late afternoon in Europe (5-7 PM). With Asia, early morning MST (6-8 AM) works for evening in East Asia (9-11 PM).

Practical Guidance

When scheduling across the US, note that Denver is often a convenient midpoint between coasts. If you have a meeting at 10 AM MDT, it is 12 PM EDT and 9 AM PDT. Be aware that Arizona (most) does not change clocks, so during summer, Phoenix is on MST (UTC-07:00) while Denver is on MDT (UTC-06:00) – a one-hour difference. Also, the Navajo Nation observes DST, but the Hopi Reservation does not, creating a time zone enclave.