Use this MDT to MST time converter to compare US Mountain and US Mountain time instantly. MST is 1 hour behind MDT, so 9:00 AM MDT becomes 8:00 AM MST and 5:00 PM MDT becomes 4:00 PM MST. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.
Use this MDT to MST converter to compare US Mountain and US Mountain time, check the 1 hour gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 10:00 AM MDT / 9:00 AM MST.
Converting between Mountain Daylight Time and Mountain Standard Time means accounting for a 1 hour gap — here's how to do it in under 10 seconds with no sign-up.
Pick the date and time in Mountain Daylight Time (UTC -6) that you want to convert. Hit "Now" to load the current MDT time instantly, or use "+1h" to step forward and compare.
The equivalent Mountain Standard Time (UTC -7) time appears immediately. Since MST is 1 hour behind of MDT, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the MST result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — useful when Daylight Saving Time changes the gap.
When someone in United States suggests 10:00 AM MDT, that's 9:00 AM MST. This converter shows the overlap so both sides agree on one slot — no back-and-forth.
Late-night MDT times can land on a different date in MST because of the 1 hour offset. The converter labels "next day" or "previous day" next to the result so you never send a message a day early or miss a deadline.
Daylight Saving adjustments can widen or narrow the MDT–MST gap by an hour. During transition weeks many people get it wrong. This converter pulls the current UTC offsets automatically, so the result is right even on the changeover day.
Product launches, sports matches, and webinars are often announced in MDT. Convert the event time to MST so you know exactly when to tune in — with a 1 hour difference, a morning event in United States falls during work hours in United States.
Quick-reference conversion table covering every hour of the day at a glance.
Mountain Daylight Time to Mountain Standard Time full day schedule
| Mountain Daylight Time | Mountain Standard Time |
|---|---|
| 12:00 AM |
11:00 PM
(previous day)
|
| 1:00 AM |
12:00 AM
|
| 2:00 AM |
1:00 AM
|
| 3:00 AM |
2:00 AM
|
| 4:00 AM |
3:00 AM
|
| 5:00 AM |
4:00 AM
|
| 6:00 AM |
5:00 AM
|
| 7:00 AM |
6:00 AM
|
| 8:00 AM |
7:00 AM
|
| 9:00 AM |
8:00 AM
|
| 10:00 AM |
9:00 AM
|
| 11:00 AM |
10:00 AM
|
| 12:00 PM |
11:00 AM
|
| 1:00 PM |
12:00 PM
|
| 2:00 PM |
1:00 PM
|
| 3:00 PM |
2:00 PM
|
| 4:00 PM |
3:00 PM
|
| 5:00 PM |
4:00 PM
|
| 6:00 PM |
5:00 PM
|
| 7:00 PM |
6:00 PM
|
| 8:00 PM |
7:00 PM
|
| 9:00 PM |
8:00 PM
|
| 10:00 PM |
9:00 PM
|
| 11:00 PM |
10:00 PM
|
US Mountain — Denver, Salt Lake City, most of Arizona (Arizona notably observes no DST, so it's MST year-round while its neighbours flip). Business hours 9 AM – 5 PM MT.
Explore more MDT conversions for major business and travel corridors. Each page includes a 24-hour chart, time difference summary, and meeting overlap guidance.
Find the time difference from any major zone into Mountain Standard Time. Use these pages when scheduling with United States from a different region.
