GST to MST
-11hGST
GSTSOURCEMST
MSTGreen rows indicate typical business hours (9 AM - 5 PM)
GST and MST on the World Map
The map below highlights the GST (Gulf Standard Time) and MST (Mountain Standard Time) timezone regions across the globe.
GST – Gulf Standard Time
UTC+04:00Gulf Standard Time (GST) is used in the UAE, Oman, and other Gulf states, 4 hours ahead of UTC.
- •Dubai uses GST year-round with no daylight saving time.
- •GST is 9 hours ahead of EST and 4 hours ahead of GMT.
- •The Dubai Financial Market (DFM) operates on GST.
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.
Understanding the -11h Gap: GST vs MST
GST runs on Gulf Standard Time (GST) at UTC+04:00. MST runs on Mountain Standard Time (MST) at UTC-07:00. That puts GST 11 hours behind MST — a difference of -11h at the current offsets.
In practice, when it is 9:00 AM in GST it is 10:00 PM in MST on the previous day. Midnight in GST is 1:00 PM in MST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
GST to MST time conversion table
| GST (GST) | MST (MST) | Day |
|---|---|---|
| 12:00 AM | 1:00 PM | previous day |
| 6:00 AM | 7:00 PM | previous day |
| 7:00 AM | 8:00 PM | previous day |
| 8:00 AM | 9:00 PM | previous day |
| 9:00 AM | 10:00 PM | previous day |
| 12:00 PM | 1:00 AM | same day |
| 3:00 PM | 4:00 AM | same day |
| 5:00 PM | 6:00 AM | same day |
| 6:00 PM | 7:00 AM | same day |
| 9:00 PM | 10:00 AM | same day |
Why people convert GST to MST time
- Scheduling a call from GST to MST: a 10:00 AM start in GST lands at 11:00 PM in MST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -11h gap: GST 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 10:00 PM in GST.
- Watching a live event or market open: GST viewers need 10:00 PM in MST to catch a 9:00 AM start there, and 11:00 AM if the event is anchored to GST.
- Always state the zone abbreviation, not just the hour. "3:00 PM GST" is unambiguous; "3 PM" across a -11h gap is not.
- With a -11h gap there is no shared 9-to-5 window, so alternate the early start: one week GST takes the early slot, the next week MST does.
About GST (Gulf Standard Time)
Gulf Standard Time (GST) is the time zone used in the United Arab Emirates, Oman, and other Gulf states. GST does not observe daylight saving time. Dubai and Abu Dhabi, major international business and tourism hubs, operate on GST.
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 GST and MST
With a -11h offset there is no overlap inside a normal 9 AM – 5 PM day. MST opens at 9:00 AM MST, which is 10:00 PM in GST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
GST and MST have no shared working hours because of the -11h gap. Teams need to alternate early starts or rely on asynchronous handovers.
GST is 11 hours behind MST (GST UTC+04:00 → 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
GST
Does not observe DST
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 GST and MST?
GST (GST, UTC+04:00) is 11 hours behind MST (MST, UTC-07:00). The gap is currently -11h.
How do I convert GST time to MST time?
Add -11h to GST local time. For example, 9:00 AM in GST is 10:00 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 -11h offset from GST.
What is the best time to call MST from GST?
There is no shared working-hours window because of the -11h gap. The closest option is 1:00 PM in GST, which is 2:00 AM in MST.
Which is behind, GST or MST?
GST is 11 hours behind MST. When it is 12:00 PM in GST it is 1:00 AM in MST.
Does daylight saving time affect the GST–MST difference?
Neither zone observes daylight saving time, so the -11h offset between GST and MST is fixed all year.
Which other cities share GST's time zone?
GST also covers Dubai, Abu Dhabi, Muscat, Baku, Tbilisi.
Which countries use GST, GST's zone?
GST is used in UAE, Oman, Georgia, Azerbaijan, Mauritius.
Is there a day difference between GST and MST?
Not normally. The -11h gap only pushes the date over the previous day.
What is the time difference between GST and MST?
MST is -11h from GST.
What timezone is GST in?
GST operates on its local timezone.
What timezone is MST in?
MST operates on its local timezone.
Which countries use GST (Gulf Standard Time)?
GST is used in UAE, Oman, Georgia, Azerbaijan, Mauritius.
Does GST observe daylight saving time?
No, GST does not observe daylight saving time and remains at UTC+04:00 year-round.
What are some interesting facts about GST?
Dubai uses GST year-round with no daylight saving time. GST is 9 hours ahead of EST and 4 hours ahead of GMT.
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 GST, what time is it in MST?
When it is 12:00 AM (midnight) in GST (GST), it is -11h later in MST (MST).
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