MDT — Mountain Daylight Time
See what MDT means, where it is used, how it relates to MST, and convert Mountain Daylight Time to other time zones.
Meaning and Areas Used
MDT stands for Mountain Daylight Time and has a UTC-6 offset. It is observed during daylight saving time in parts of Canada, Mexico, and the United States.
DST and MST Relationship
MDT is the daylight saving counterpart to MST, which is UTC-7 during standard time. This page helps track when regions switch and automatically reflects DST changes.
Convert MDT to Others
Compare MDT with other time zones using the visual time grid and hour-by-hour tables. Export meetings with ICS download or send 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 visual comparison grid with Mountain Daylight Time already in view. This is useful when you need to line up work hours in MDT for a client call in Boise, a logistics update in Chihuahua, or a distributed team handoff across the United States, Canada, and Mexico.
Add comparison cities: Click + Add City and search for the places you want to compare against MDT. A practical setup is to add cities tied to sales, support, or operations in Boise, Chihuahua, and Ciudad Delicias so you can compare schedules across the regions that use Mountain Daylight Time.
Select a time range on the grid: Click Select to enter selection mode, then drag across the colored timeline on the MDT row to highlight the meeting window in purple. You can drag the center of the selection to move it or use the left and right handles to resize it, which is helpful when you are narrowing down overlap between daytime work hours in Idaho and business hours in northern Mexico.
Export and share the result: After selecting a range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is especially useful for sending a confirmed MDT meeting window to remote teams, customer success staff, or field operations teams so everyone receives the same schedule in their local calendar tools.
About Mountain Daylight Time (MDT)
Mountain Daylight Time, abbreviated MDT, is the daylight saving version of the Mountain time zone. Its exact offset is UTC-6, which means local MDT time is six hours behind Coordinated Universal Time.
MDT is used in Canada, Mexico, and the United States. On this page, key cities associated with MDT include Boise, Meridian, Nampa, Idaho Falls, Pocatello, Chihuahua, Ciudad Delicias, Cuauhtémoc, Parral, and Nuevo Casas Grandes, making it relevant for regional business coordination, travel timing, and cross-border scheduling.
MDT is specifically a daylight saving time abbreviation, and its standard-time counterpart is MST. That distinction matters because calendars, flight itineraries, and meeting invites may show MDT during the daylight saving portion of the year and MST outside that period.
Other abbreviations that share the same UTC-6 offset include CST, CT, EAST, GALT, MT, and S. Even when the offset matches, the geographic region and daylight saving rules can differ, so using a city-based comparison on the converter is the safest way to avoid scheduling mistakes.
MDT and Daylight Saving Time
MDT is not a year-round standard time label; it is the daylight saving form of Mountain time. When daylight saving time is in effect, locations observing this convention use MDT (UTC-6), and when that period ends, they switch back to MST.
The key practical point is that MDT changes to MST when daylight saving time ends, and MST changes to MDT when daylight saving time begins. Because the exact switch dates for the current year are not included here, the most reliable way to confirm the active abbreviation for a specific day is to use the date picker on the converter page and view the timeline for that date before sending invites or booking travel.
This distinction is important for recurring meetings and transportation planning. A weekly meeting labeled only as “Mountain Time” can shift by an hour for participants if one side assumes MDT while another assumes MST, so using the exact abbreviation on calendar events helps prevent missed calls and late arrivals.
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.
Is MDT the same as MST?
No, MDT is not the same as MST. MDT is the daylight saving abbreviation, while MST is its standard-time counterpart, so the abbreviation changes depending on whether daylight saving time is in effect.
Which cities use MDT?
Cities associated with MDT on this page include Boise, Meridian, Nampa, Idaho Falls, Pocatello, Chihuahua, Ciudad Delicias, Cuauhtémoc, Parral, and Nuevo Casas Grandes. These cities make MDT especially relevant for scheduling across parts of the United States, Canada, and Mexico.
What is the UTC offset for MDT?
The UTC offset for MDT is UTC-6. In practical terms, that means Mountain Daylight Time is six hours behind Coordinated Universal Time.
When does MDT change?
MDT changes when daylight saving time ends, at which point it switches back to MST. It also returns from MST to MDT when daylight saving time begins, so anyone scheduling future meetings should confirm the abbreviation being used for the specific date.
Is MDT used in more than one country?
Yes, MDT is used in Canada, Mexico, and the United States. That makes it important for cross-border coordination, especially when teams, customers, or transport schedules involve cities in Idaho and northern Mexico.
Are MDT and other UTC-6 abbreviations interchangeable?
No, they are not always interchangeable even though they can share the same offset. Abbreviations such as CST, CT, EAST, GALT, MT, and S also use UTC-6, but they may refer to different regions or follow different daylight saving practices, so city-based comparison is the better choice for accurate scheduling.