EEST to MST
-10hEEST
EESTSOURCEMST
MSTGreen rows indicate typical business hours (9 AM - 5 PM)
EEST and MST on the World Map
The map below highlights the EEST (Eastern European Summer Time) and MST (Mountain Standard Time) timezone regions across the globe.
EEST – Eastern European Summer Time
UTC+03:00Eastern European Summer Time (EEST, UTC+03:00) is the daylight saving period across eastern Europe, from late March to late October.
- •EEST runs from the last Sunday in March to the last Sunday in October.
- •EEST is one hour ahead of Eastern European Time (EET, UTC+02:00).
- •During EEST, eastern Europe is level with Moscow, Istanbul and Riyadh.
- •EEST follows the EU-wide summer time schedule.
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.
Everything You Need to Know About EEST and MST Time
EEST runs on Eastern European Summer Time (EEST) at UTC+03:00. MST runs on Mountain Standard Time (MST) at UTC-07:00. That puts EEST 10 hours behind MST — a difference of -10h at the current offsets.
In practice, when it is 9:00 AM in EEST it is 11:00 PM in MST on the previous day. Midnight in EEST is 2:00 PM in MST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
EEST to MST time conversion table
| EEST (EEST) | MST (MST) | Day |
|---|---|---|
| 12:00 AM | 2:00 PM | previous day |
| 6:00 AM | 8:00 PM | previous day |
| 7:00 AM | 9:00 PM | previous day |
| 8:00 AM | 10:00 PM | previous day |
| 9:00 AM | 11:00 PM | previous day |
| 12:00 PM | 2:00 AM | same day |
| 3:00 PM | 5:00 AM | same day |
| 5:00 PM | 7:00 AM | same day |
| 6:00 PM | 8:00 AM | same day |
| 9:00 PM | 11:00 AM | same day |
Why people convert EEST to MST time
- Scheduling a call from EEST to MST: a 10:00 AM start in EEST lands at 12:00 AM in MST, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -10h gap: EEST and MST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in MST is 11:00 PM in EEST.
- Keeping family and friends in sync: knowing that 8:00 PM in EEST is 10:00 AM in MST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM EEST" is unambiguous; "3 PM" across a -10h gap is not.
- With a -10h gap there is no shared 9-to-5 window, so alternate the early start: one week EEST takes the early slot, the next week MST does.
About EEST (Eastern European Summer Time)
Eastern European Summer Time (EEST) is the daylight saving period used across eastern Europe, when clocks move one hour forward from Eastern European Time (EET, UTC+02:00) to UTC+03:00. It runs from the last Sunday in March to the last Sunday in October, in step with the rest of the European Union. EEST covers Greece, Finland, Romania, Bulgaria, the Baltic states, Ukraine and Moldova, and matches the offset used year-round by Moscow, Istanbul and Riyadh during those months. Athens and Helsinki both sit near the western edge of the EEST band, so summer evenings stay light well past 21:00.
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 EEST and MST
With a -10h offset there is no overlap inside a normal 9 AM – 5 PM day. MST opens at 9:00 AM MST, which is 11:00 PM in EEST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
EEST and MST have no shared working hours because of the -10h gap. Teams need to alternate early starts or rely on asynchronous handovers.
EEST is 10 hours behind MST (EEST UTC+03:00 → MST UTC-07:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
EEST
☀ Currently in DST
Standard: UTC+02:00 · DST: UTC+03:00
Clocks fall back on Sun, Oct 25, 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 EEST and MST?
EEST (EEST, UTC+03:00) is 10 hours behind MST (MST, UTC-07:00). The gap is currently -10h.
How do I convert EEST time to MST time?
Add -10h to EEST local time. For example, 9:00 AM in EEST is 11:00 PM in MST (previous day).
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 -10h offset from EEST.
What is the best time to call MST from EEST?
There is no shared working-hours window because of the -10h gap. The closest option is 1:00 PM in EEST, which is 3:00 AM in MST.
Which is behind, EEST or MST?
EEST is 10 hours behind MST. When it is 12:00 PM in EEST it is 2:00 AM in MST.
Does daylight saving time affect the EEST–MST difference?
Neither zone observes daylight saving time, so the -10h offset between EEST and MST is fixed all year.
Which other cities share EEST's time zone?
EEST also covers Athens, Helsinki, Bucharest, Sofia, Kyiv, Riga.
Which countries use EEST, EEST's zone?
EEST is used in Greece, Finland, Romania, Bulgaria, Estonia, Latvia, Lithuania, Ukraine and 2 more.
Is there a day difference between EEST and MST?
Not normally. The -10h gap only pushes the date over the previous day.
What is the time difference between EEST and MST?
MST is -10h from EEST.
What timezone is EEST in?
EEST operates on its local timezone.
What timezone is MST in?
MST operates on its local timezone.
Which countries use EEST (Eastern European Summer Time)?
EEST is used in Greece, Finland, Romania, Bulgaria, Estonia, Latvia, and 4 more countries.
Does EEST observe daylight saving time?
Yes, EEST switches to EEST during summer months.
What are some interesting facts about EEST?
EEST runs from the last Sunday in March to the last Sunday in October. EEST is one hour ahead of Eastern European Time (EET, UTC+02:00).
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 EEST, what time is it in MST?
When it is 12:00 AM (midnight) in EEST (EEST), it is -10h later in MST (MST).
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See every conversion from EEST →·See every conversion from MST →