EST to MST
-2hEST
ESTSOURCEMST
MSTGreen rows indicate typical business hours (9 AM - 5 PM)
EST and MST on the World Map
The map below highlights the EST (Eastern Standard Time) and MST (Mountain Standard Time) timezone regions across the globe.
EST – Eastern Standard Time
UTC-05:00Eastern Standard Time (EST) is the time zone for the eastern United States and Canada, 5 hours behind UTC.
- •EST is the most widely used time zone in the United States by population.
- •The New York Stock Exchange (NYSE) and NASDAQ operate on Eastern Time, opening at 9:30 AM EST.
- •23 US states are fully or partially in the Eastern Time Zone.
- •EST was established by the Standard Time Act of 1918.
- •Over 47% of the US population lives in the Eastern Time Zone.
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.
Time Conversion Guide: EST to MST
EST runs on Eastern Standard Time (EST) at UTC-05:00. MST runs on Mountain Standard Time (MST) at UTC-07:00. That puts EST 2 hours behind MST — a difference of -2h at the current offsets.
In practice, when it is 9:00 AM in EST it is 7:00 AM in MST. Midnight in EST is 10:00 PM in MST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
EST to MST time conversion table
| EST (EST) | MST (MST) | Day |
|---|---|---|
| 12:00 AM | 10:00 PM | previous day |
| 6:00 AM | 4:00 AM | same day |
| 7:00 AM | 5:00 AM | same day |
| 8:00 AM | 6:00 AM | same day |
| 9:00 AM | 7:00 AM | same day |
| 12:00 PM | 10:00 AM | same day |
| 3:00 PM | 1:00 PM | same day |
| 5:00 PM | 3:00 PM | same day |
| 6:00 PM | 4:00 PM | same day |
| 9:00 PM | 7:00 PM | same day |
Why people convert EST to MST time
- Scheduling a call from EST to MST: a 10:00 AM start in EST lands at 8:00 AM in MST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both EST and MST are inside the 9-to-5 working day between 11:00 AM and 5:00 PM EST time (9:00 AM–3:00 PM MST). That is roughly 6 hours of usable overlap.
- Booking travel or deliveries: tracking MST local time against EST keeps pickup windows and arrival estimates honest across the -2h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM EST" is unambiguous; "3 PM" across a -2h gap is not.
- Block 11:00 AM–5:00 PM EST as the recurring meeting window if you work primarily from EST and need MST colleagues present.
About EST (Eastern Standard Time)
Eastern Standard Time (EST) is observed during the winter months in the eastern part of North America. It covers 23 US states and parts of Canada including Ontario and Quebec. EST is the most populous time zone in the United States, home to major financial centers like New York City and global organizations headquartered in Washington D.C. During daylight saving time (March–November), clocks shift to Eastern Daylight Time (EDT, UTC-04:00). The time zone also covers parts of the Caribbean and Central America including Panama, Jamaica, and the Cayman Islands.
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 EST and MST
Both EST and MST sit inside the 9 AM – 5 PM working day between 11:00 AM–5:00 PM EST, which is 9:00 AM–3:00 PM MST. That gives roughly 6 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
EST and MST share 6 hours of working-hours overlap (11:00 AM–5:00 PM EST), so scheduling a live meeting is straightforward.
EST is 2 hours behind MST (EST UTC-05:00 → MST UTC-07:00). The shared working window is 11:00 AM–5:00 PM EST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
EST
☀ 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 EST and MST?
EST (EST, UTC-05:00) is 2 hours behind MST (MST, UTC-07:00). The gap is currently -2h.
How do I convert EST time to MST time?
Add -2h to EST local time. For example, 9:00 AM in EST is 7:00 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 -2h offset from EST.
What is the best time to call MST from EST?
Call between 11:00 AM and 5:00 PM EST — that maps to 9:00 AM–3:00 PM MST and keeps both parties inside the working day.
Which is behind, EST or MST?
EST is 2 hours behind MST. When it is 12:00 PM in EST it is 10:00 AM in MST.
Does daylight saving time affect the EST–MST difference?
Neither zone observes daylight saving time, so the -2h offset between EST and MST is fixed all year.
Which other cities share EST's time zone?
EST also covers New York City, Washington D.C., Miami, Toronto, Philadelphia, Atlanta, Boston, Montreal and 8 more.
Which countries use EST, EST's zone?
EST is used in United States (Eastern), Canada (Ontario, Quebec), Mexico (Quintana Roo), Panama, Jamaica, Cayman Islands, Haiti, Bahamas and 4 more.
Is there a day difference between EST and MST?
Not normally. The -2h gap only pushes the date over the previous day.
What is the time difference between EST and MST?
MST is -2h from EST.
What timezone is EST in?
EST operates on its local timezone.
What timezone is MST in?
MST operates on its local timezone.
Which countries use EST (Eastern Standard Time)?
EST is used in United States (Eastern), Canada (Ontario, Quebec), Mexico (Quintana Roo), Panama, Jamaica, Cayman Islands, and 6 more countries.
Does EST observe daylight saving time?
Yes, EST switches to EDT during summer months.
What are some interesting facts about EST?
EST is the most widely used time zone in the United States by population. The New York Stock Exchange (NYSE) and NASDAQ operate on Eastern Time, opening at 9:30 AM EST.
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 EST, what time is it in MST?
When it is 12:00 AM (midnight) in EST (EST), it is -2h later in MST (MST).
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See every conversion from EST →·See every conversion from MST →