MDT — Mountain Daylight Time
See where MDT is used, how it relates to MST during daylight saving time, and convert MDT to other time zones accurately.
Meaning and Usage Areas
MDT stands for Mountain Daylight Time and has an offset of UTC-6. It is observed during daylight saving time in parts of Canada, Mexico, and the United States.
MDT and MST Relationship
MDT is the daylight saving counterpart to MST, which is UTC-7. Regions that observe DST switch from MST to MDT seasonally and return automatically when DST ends.
Convert MDT to Others
Compare MDT with other time zones using visual time grids and hour-by-hour tables. Export meeting times with ICS download or send them to Google Calendar and Gmail.
How to Convert MDT to Other Time Zones
Open the MDT converter page: Go to https://www.xconvert.com/time-converter/mdt-time-zone to load a comparison grid with MDT already represented for planning across Mountain Daylight Time locations such as Albuquerque, Calgary, Boise, or Ciudad Juárez. This layout is useful when you need to line up a sales call, customer support coverage window, or project handoff involving teams in the western United States, Canada, or northern Mexico.
Add comparison cities: Click + Add City and search for cities you want to compare against MDT-based schedules, such as offices where your clients, vendors, or remote teammates are located. For practical coordination, many users add major business hubs tied to North American operations so they can compare an MDT workday against finance, logistics, software, or cross-border manufacturing schedules.
Select a meeting window on the grid: Click Select, then drag across the MDT row to highlight a time block in purple, such as a late-morning or mid-afternoon availability window for a team in Colorado Springs, Aurora, or Chihuahua. You can drag the center of the selection to move the whole block or use the left and right handles to resize it, which helps when narrowing a support shift, interview slot, or recurring operations check-in.
Export and share the result: Once a range is selected, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link to send the converted time window to everyone involved. This is especially useful for distributed teams that need the same MDT-based meeting to appear correctly in each participant’s local calendar without manually rewriting the time.
About Mountain Daylight Time (MDT)
MDT stands for Mountain Daylight Time. It is a daylight saving time abbreviation with an exact offset of UTC-6, placing it six hours behind Coordinated Universal Time during the daylight saving period.
Mountain Daylight Time is used in parts of Canada, Mexico, and the United States. Cities associated with MDT include Albuquerque, Aurora, Boise, Calgary, Chihuahua, Ciudad Delicias, Ciudad Juárez, Colorado Springs, Cuauhtémoc, and Culiacán, making it relevant for cross-border business, transportation planning, and regional scheduling across western and central parts of North America.
MDT is the daylight saving counterpart of MST. When daylight saving time is in effect, locations that observe this seasonal change use MDT instead of their standard-time designation, so it is important to distinguish between the two when booking meetings, travel, or shift coverage.
MDT shares its UTC-6 offset with several other abbreviations, including CST, CT, EAST, GALT, MT, and S. Even when the offset matches, the abbreviation still matters because the underlying region and seasonal timekeeping rules can differ, which affects how people label meetings and interpret calendars.
MDT and Daylight Saving Time
Mountain Daylight Time is itself a daylight saving time abbreviation rather than a year-round standard time zone name. Its standard counterpart is MST, so when daylight saving time ends, locations using MDT switch back to MST.
This distinction matters in business scheduling because a calendar entry labeled MDT refers specifically to the daylight-saving portion of the year. If you are coordinating recurring meetings with teams in Canada, Mexico, or the United States, confirming whether a location is currently on MDT or MST helps avoid one-hour mistakes in operations, recruiting, customer support, and travel itineraries.
MDT uses an exact offset of UTC-6 while it is in effect. When the seasonal period changes, the abbreviation changes to MST, so users comparing time zones should pay attention to the label shown on the grid rather than assuming “Mountain Time” always means the same offset.
Frequently Asked Questions
What does MDT stand for?
MDT stands for Mountain Daylight Time. It is the daylight saving version of Mountain Time and uses an exact offset of UTC-6.
This abbreviation appears in schedules, calendar invites, travel plans, and operating hours for locations that observe the daylight saving version of Mountain Time. Seeing “MDT” instead of “MST” tells you that the daylight-saving designation is being used.
Is MDT the same as MST?
No. MDT and MST are related, but they are not the same abbreviation. MDT is the daylight saving counterpart, while MST is the standard counterpart.
This difference matters because schedules labeled MDT are referring to the daylight-saving period, not standard time. If you are booking a meeting with someone in Albuquerque, Calgary, or Boise, using the correct abbreviation helps prevent a one-hour scheduling error.
Which cities use MDT?
Cities associated with MDT include Albuquerque, Aurora, Boise, Calgary, Chihuahua, Ciudad Delicias, Ciudad Juárez, Colorado Springs, Cuauhtémoc, and Culiacán. These cities span Canada, Mexico, and the United States, which makes MDT important for regional coordination across multiple countries.
That geographic spread is especially relevant for industries that work across borders, such as logistics, manufacturing, customer support, and regional sales. A single MDT-based schedule can affect teams and customers in several major urban areas at once.
What is the UTC offset for MDT?
The UTC offset for MDT is UTC-6. That means MDT is six hours behind Coordinated Universal Time while this daylight saving abbreviation is in effect.
This offset is useful when comparing international schedules, especially if a meeting invite shows UTC instead of local time. It also helps when syncing operations across systems that store timestamps in UTC but display local working hours for North American teams.
When does MDT change?
MDT changes when a location stops using the daylight saving designation and returns to MST. The key point is that MDT is not the standard-time label; it is used only during the daylight saving portion of the year.
For scheduling, that means recurring meetings, support rosters, and travel plans should always confirm whether the time is currently being expressed as MDT or MST. The abbreviation itself tells you which seasonal time setting is intended.
Is MDT used in more than one country?
Yes. MDT is used in Canada, Mexico, and the United States. That makes it a cross-border time designation rather than one limited to a single national system.
This is important for companies handling North American operations, especially when teams in places like Calgary, Albuquerque, and Ciudad Juárez need to coordinate on the same business day. Using MDT consistently in calendars and planning documents reduces confusion across those locations.
Is MDT the only abbreviation with UTC-6?
No. MDT shares the UTC-6 offset with CST, CT, EAST, GALT, MT, and S. The matching offset does not mean those abbreviations are interchangeable in every context.
Abbreviations carry regional and seasonal meaning in addition to the numeric offset. For that reason, meeting invites and published schedules should use MDT when the intended reference is Mountain Daylight Time, especially for North American coordination.