EDT to MST
-3hEDT
EDTSOURCEMST
MSTGreen rows indicate typical business hours (9 AM - 5 PM)
EDT and MST on the World Map
The map below highlights the EDT (Eastern Daylight Time) and MST (Mountain Standard Time) timezone regions across the globe.
EDT – Eastern Daylight Time
UTC-04:00Eastern Daylight Time (EDT) is the daylight saving time observed in the Eastern Time Zone, 4 hours behind UTC.
- •EDT is observed from the second Sunday of March to the first Sunday of November.
- •During EDT, the US East Coast is only 4 hours behind London (instead of 5).
- •Not all EST locations switch to EDT – Panama and Jamaica stay on EST year-round.
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.
EDT to MST Time Difference – Complete Guide
EDT runs on Eastern Daylight Time (EDT) at UTC-04:00. MST runs on Mountain Standard Time (MST) at UTC-07:00. That puts EDT 3 hours behind MST — a difference of -3h at the current offsets.
In practice, when it is 9:00 AM in EDT it is 6:00 AM in MST. Midnight in EDT is 9:00 PM in MST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
EDT to MST time conversion table
| EDT (EDT) | MST (MST) | Day |
|---|---|---|
| 12:00 AM | 9:00 PM | previous day |
| 6:00 AM | 3:00 AM | same day |
| 7:00 AM | 4:00 AM | same day |
| 8:00 AM | 5:00 AM | same day |
| 9:00 AM | 6:00 AM | same day |
| 12:00 PM | 9:00 AM | same day |
| 3:00 PM | 12:00 PM | same day |
| 5:00 PM | 2:00 PM | same day |
| 6:00 PM | 3:00 PM | same day |
| 9:00 PM | 6:00 PM | same day |
Why people convert EDT to MST time
- Scheduling a call from EDT to MST: a 10:00 AM start in EDT lands at 7:00 AM in MST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both EDT and MST are inside the 9-to-5 working day between 12:00 PM and 5:00 PM EDT time (9:00 AM–2:00 PM MST). That is roughly 5 hours of usable overlap.
- Watching a live event or market open: EDT viewers need 6:00 AM in MST to catch a 9:00 AM start there, and 3:00 AM if the event is anchored to EDT.
- Always state the zone abbreviation, not just the hour. "3:00 PM EDT" is unambiguous; "3 PM" across a -3h gap is not.
- Block 12:00 PM–5:00 PM EDT as the recurring meeting window if you work primarily from EDT and need MST colleagues present.
About EDT (Eastern Daylight Time)
Eastern Daylight Time (EDT) is used during the summer months (second Sunday of March to the first Sunday of November) in the Eastern Time Zone. During EDT, clocks are advanced by one hour to take advantage of longer daylight hours. Not all locations in the Eastern Time Zone observe DST – Panama, Jamaica, and most of the Caribbean remain on EST year-round.
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).
Best time to call between EDT and MST
Both EDT and MST sit inside the 9 AM – 5 PM working day between 12:00 PM–5:00 PM EDT, which is 9:00 AM–2:00 PM MST. That gives roughly 5 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
EDT and MST share 5 hours of working-hours overlap (12:00 PM–5:00 PM EDT), so scheduling a live meeting is straightforward.
EDT is 3 hours behind MST (EDT UTC-04:00 → MST UTC-07:00). The shared working window is 12:00 PM–5:00 PM EDT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
EDT
☀ Currently in DST
Standard: UTC-05:00 · DST: UTC-04:00
Clocks fall back on Sun, Nov 1, 2026
MST
☀ 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 EDT and MST?
EDT (EDT, UTC-04:00) is 3 hours behind MST (MST, UTC-07:00). The gap is currently -3h.
How do I convert EDT time to MST time?
Add -3h to EDT local time. For example, 9:00 AM in EDT is 6:00 AM in MST.
What time is it in MST right now?
MST uses MST at UTC-07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -3h offset from EDT.
What is the best time to call MST from EDT?
Call between 12:00 PM and 5:00 PM EDT — that maps to 9:00 AM–2:00 PM MST and keeps both parties inside the working day.
Which is behind, EDT or MST?
EDT is 3 hours behind MST. When it is 12:00 PM in EDT it is 9:00 AM in MST.
Does daylight saving time affect the EDT–MST difference?
Neither zone observes daylight saving time, so the -3h offset between EDT and MST is fixed all year.
Which other cities share EDT's time zone?
EDT also covers New York City, Washington D.C., Toronto, Miami, Philadelphia, Atlanta, Boston, Montreal.
Which countries use EDT, EDT's zone?
EDT is used in United States (Eastern), Canada (Ontario, Quebec), Bahamas, Haiti, Turks and Caicos.
Is there a day difference between EDT and MST?
Not normally. The -3h gap only pushes the date over the previous day.
What is the time difference between EDT and MST?
MST is -3h from EDT.
What timezone is EDT in?
EDT operates on its local timezone.
What timezone is MST in?
MST operates on its local timezone.
Which countries use EDT (Eastern Daylight Time)?
EDT is used in United States (Eastern), Canada (Ontario, Quebec), Bahamas, Haiti, Turks and Caicos.
Does EDT observe daylight saving time?
Yes, EDT switches to EST during summer months.
What are some interesting facts about EDT?
EDT is observed from the second Sunday of March to the first Sunday of November. During EDT, the US East Coast is only 4 hours behind London (instead of 5).
Which cities are in the MST timezone?
Major cities in the MST timezone include Denver, Phoenix, Salt Lake City, Calgary, Edmonton, Albuquerque, El Paso, Tucson.
What is the UTC offset for MST?
Mountain Standard Time (MST) is at UTC-07:00. During daylight saving time, it shifts to MDT.
What should I know about the MST timezone?
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.
When is it midnight in EDT, what time is it in MST?
When it is 12:00 AM (midnight) in EDT (EDT), it is -3h later in MST (MST).
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