MST to MDT
+1hMST
MSTSOURCEMDT
MDTGreen rows indicate typical business hours (9 AM - 5 PM)
MST and MDT on the World Map
The map below highlights the MST (Mountain Standard Time) and MDT (Mountain Daylight Time) timezone regions across the globe.
MST – Mountain Standard Time
UTC-07:00Mountain Standard Time (MST) is the time zone for the Mountain region of North America, 7 hours behind UTC.
- •Arizona does not observe daylight saving time, staying on MST year-round.
- •The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
- •Denver, the 'Mile High City', is the largest city fully in MST.
- •MST covers 6 US states entirely and parts of several others.
MDT – Mountain Daylight Time
UTC-06:00Mountain Daylight Time (MDT) is the daylight saving offset in the Mountain Time Zone, 6 hours behind UTC.
- •MDT shares the same offset as CST (UTC-06:00).
- •Arizona does not switch to MDT, remaining on MST.
Comparing Time Zones: MST and MDT
MST runs on Mountain Standard Time (MST) at UTC-07:00. MDT runs on Mountain Daylight Time (MDT) at UTC-06:00. That puts MST 1 hour ahead of MDT — a difference of +1h at the current offsets.
In practice, when it is 9:00 AM in MST it is 10:00 AM in MDT. Midnight in MST is 1:00 AM in MDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
MST to MDT time conversion table
| MST (MST) | MDT (MDT) | Day |
|---|---|---|
| 12:00 AM | 1:00 AM | same day |
| 6:00 AM | 7:00 AM | same day |
| 7:00 AM | 8:00 AM | same day |
| 8:00 AM | 9:00 AM | same day |
| 9:00 AM | 10:00 AM | same day |
| 12:00 PM | 1:00 PM | same day |
| 3:00 PM | 4:00 PM | same day |
| 5:00 PM | 6:00 PM | same day |
| 6:00 PM | 7:00 PM | same day |
| 9:00 PM | 10:00 PM | same day |
Why people convert MST to MDT time
- Scheduling a call from MST to MDT: a 10:00 AM start in MST lands at 11:00 AM in MDT, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both MST and MDT are inside the 9-to-5 working day between 9:00 AM and 4:00 PM MST time (10:00 AM–5:00 PM MDT). That is roughly 7 hours of usable overlap.
- Coordinating a MST-based team with MDT contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM MST" is unambiguous; "3 PM" across a +1h gap is not.
- Block 9:00 AM–4:00 PM MST as the recurring meeting window if you work primarily from MST and need MDT colleagues present.
About MST (Mountain Standard Time)
Mountain Standard Time (MST) covers the Rocky Mountain region of the United States and Canada. Arizona is notable for not observing daylight saving time, staying on MST year-round (except the Navajo Nation). The time zone includes major cities like Denver, Phoenix, Calgary, and Salt Lake City. During summer, most areas switch to Mountain Daylight Time (MDT, UTC-06:00).
About MDT (Mountain Daylight Time)
Mountain Daylight Time (MDT) is observed during summer months in the Mountain Time Zone, except in Arizona which stays on MST year-round. MDT aligns with Central Standard Time (CST) at UTC-06:00.
Best time to call between MST and MDT
Both MST and MDT sit inside the 9 AM – 5 PM working day between 9:00 AM–4:00 PM MST, which is 10:00 AM–5:00 PM MDT. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
MST and MDT share 7 hours of working-hours overlap (9:00 AM–4:00 PM MST), so scheduling a live meeting is straightforward.
MST is 1 hour ahead of MDT (MST UTC-07:00 → MDT UTC-06:00). The shared working window is 9:00 AM–4:00 PM MST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
MST
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 2026
MDT
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between MST and MDT?
MST (MST, UTC-07:00) is 1 hour ahead of MDT (MDT, UTC-06:00). The gap is currently +1h.
How do I convert MST time to MDT time?
Add +1h to MST local time. For example, 9:00 AM in MST is 10:00 AM in MDT.
What time is it in MDT right now?
MDT uses MDT at UTC-06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +1h offset from MST.
What is the best time to call MDT from MST?
Call between 9:00 AM and 4:00 PM MST — that maps to 10:00 AM–5:00 PM MDT and keeps both parties inside the working day.
Which is ahead, MST or MDT?
MST is 1 hour ahead of MDT. When it is 12:00 PM in MST it is 1:00 PM in MDT.
Does daylight saving time affect the MST–MDT difference?
Neither zone observes daylight saving time, so the +1h offset between MST and MDT is fixed all year.
Which other cities share MST's time zone?
MST also covers Denver, Phoenix, Salt Lake City, Calgary, Edmonton, Albuquerque, El Paso, Tucson and 2 more.
Which countries use MST, MST's zone?
MST is used in United States (Mountain), Canada (Alberta), Mexico (Chihuahua, Sonora).
Is there a day difference between MST and MDT?
Not normally. The +1h gap only pushes the date over for late-evening times.
What is the time difference between MST and MDT?
MDT is +1h from MST.
What timezone is MST in?
MST operates on its local timezone.
What timezone is MDT in?
MDT operates on its local timezone.
Which countries use MST (Mountain Standard Time)?
MST is used in United States (Mountain), Canada (Alberta), Mexico (Chihuahua, Sonora).
Does MST observe daylight saving time?
Yes, MST switches to MDT during summer months.
What are some interesting facts about MST?
Arizona does not observe daylight saving time, staying on MST year-round. The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
Which cities are in the MDT timezone?
Major cities in the MDT timezone include Denver, Calgary, Edmonton, Salt Lake City, Boise.
What is the UTC offset for MDT?
Mountain Daylight Time (MDT) is at UTC-06:00. During daylight saving time, it shifts to MST.
What should I know about the MDT timezone?
MDT shares the same offset as CST (UTC-06:00). Arizona does not switch to MDT, remaining on MST.
When is it midnight in MST, what time is it in MDT?
When it is 12:00 AM (midnight) in MST (MST), it is +1h later in MDT (MDT).
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See every conversion from MST →·See every conversion from MDT →