MST to EEST
+10hMST
MSTSOURCEEEST
EESTGreen rows indicate typical business hours (9 AM - 5 PM)
MST and EEST on the World Map
The map below highlights the MST (Mountain Standard Time) and EEST (Eastern European Summer 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.
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.
Comparing Time Zones: MST and EEST
MST runs on Mountain Standard Time (MST) at UTC-07:00. EEST runs on Eastern European Summer Time (EEST) at UTC+03:00. That puts MST 10 hours ahead of EEST — a difference of +10h at the current offsets.
In practice, when it is 9:00 AM in MST it is 7:00 PM in EEST. Midnight in MST is 10:00 AM in EEST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
MST to EEST time conversion table
| MST (MST) | EEST (EEST) | Day |
|---|---|---|
| 12:00 AM | 10:00 AM | same day |
| 6:00 AM | 4:00 PM | same day |
| 7:00 AM | 5:00 PM | same day |
| 8:00 AM | 6:00 PM | same day |
| 9:00 AM | 7:00 PM | same day |
| 12:00 PM | 10:00 PM | same day |
| 3:00 PM | 1:00 AM | next day |
| 5:00 PM | 3:00 AM | next day |
| 6:00 PM | 4:00 AM | next day |
| 9:00 PM | 7:00 AM | next day |
Why people convert MST to EEST time
- Scheduling a call from MST to EEST: a 10:00 AM start in MST lands at 8:00 PM in EEST, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +10h gap: MST and EEST 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 EEST is 7:00 PM in MST.
- Coordinating a MST-based team with EEST 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 +10h gap is not.
- With a +10h gap there is no shared 9-to-5 window, so alternate the early start: one week MST takes the early slot, the next week EEST does.
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 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.
Best time to call between MST and EEST
With a +10h offset there is no overlap inside a normal 9 AM – 5 PM day. EEST opens at 9:00 AM EEST, which is 7:00 PM in MST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
MST and EEST have no shared working hours because of the +10h gap. Teams need to alternate early starts or rely on asynchronous handovers.
MST is 10 hours ahead of EEST (MST UTC-07:00 → EEST UTC+03:00). 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
MST
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 2026
EEST
☀ Currently in DST
Standard: UTC+02:00 · DST: UTC+03:00
Clocks fall back on Sun, Oct 25, 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 EEST?
MST (MST, UTC-07:00) is 10 hours ahead of EEST (EEST, UTC+03:00). The gap is currently +10h.
How do I convert MST time to EEST time?
Add +10h to MST local time. For example, 9:00 AM in MST is 7:00 PM in EEST.
What time is it in EEST right now?
EEST uses EEST at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +10h offset from MST.
What is the best time to call EEST from MST?
There is no shared working-hours window because of the +10h gap. The closest option is 1:00 PM in MST, which is 11:00 PM in EEST.
Which is ahead, MST or EEST?
MST is 10 hours ahead of EEST. When it is 12:00 PM in MST it is 10:00 PM in EEST.
Does daylight saving time affect the MST–EEST difference?
Neither zone observes daylight saving time, so the +10h offset between MST and EEST 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 EEST?
Not normally. The +10h gap only pushes the date over for late-evening times.
What is the time difference between MST and EEST?
EEST is +10h from MST.
What timezone is MST in?
MST operates on its local timezone.
What timezone is EEST in?
EEST 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 EEST timezone?
Major cities in the EEST timezone include Athens, Helsinki, Bucharest, Sofia, Kyiv, Riga.
What is the UTC offset for EEST?
Eastern European Summer Time (EEST) is at UTC+03:00. During daylight saving time, it shifts to EEST.
What should I know about the EEST timezone?
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).
When is it midnight in MST, what time is it in EEST?
When it is 12:00 AM (midnight) in MST (MST), it is +10h later in EEST (EEST).
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