MST to NST
+3h 30mMST
MSTSOURCENST
NSTGreen rows indicate typical business hours (9 AM - 5 PM)
MST and NST on the World Map
The map below highlights the MST (Mountain Standard Time) and NST (Newfoundland Standard 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.
NST – Newfoundland Standard Time
UTC-03:30Newfoundland Standard Time (NST) is a unique half-hour offset time zone in Canada, 3.5 hours behind UTC.
- •NST is one of only a few half-hour offset time zones in the world.
- •Newfoundland joined Canada in 1949 and kept its unique time zone.
- •St. John's is the easternmost city in North America.
Comparing Time Zones: MST and NST
MST runs on Mountain Standard Time (MST) at UTC-07:00. NST runs on Newfoundland Standard Time (NST) at UTC-03:30. That puts MST 3 hours 30 minutes ahead of NST — a difference of +3h 30m at the current offsets.
In practice, when it is 9:00 AM in MST it is 12:30 PM in NST. Midnight in MST is 3:30 AM in NST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
MST to NST time conversion table
| MST (MST) | NST (NST) | Day |
|---|---|---|
| 12:00 AM | 3:30 AM | same day |
| 6:00 AM | 9:30 AM | same day |
| 7:00 AM | 10:30 AM | same day |
| 8:00 AM | 11:30 AM | same day |
| 9:00 AM | 12:30 PM | same day |
| 12:00 PM | 3:30 PM | same day |
| 3:00 PM | 6:30 PM | same day |
| 5:00 PM | 8:30 PM | same day |
| 6:00 PM | 9:30 PM | same day |
| 9:00 PM | 12:30 AM | next day |
Why people convert MST to NST time
- Scheduling a call from MST to NST: a 10:00 AM start in MST lands at 1:30 PM in NST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both MST and NST are inside the 9-to-5 working day between 9:00 AM and 1:30 PM MST time (12:30 PM–5:00 PM NST). That is roughly 4 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in MST is 11:30 PM in NST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM MST" is unambiguous; "3 PM" across a +3h 30m gap is not.
- Block 9:00 AM–1:30 PM MST as the recurring meeting window if you work primarily from MST and need NST colleagues present.
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 NST (Newfoundland Standard Time)
Newfoundland Standard Time (NST) is one of the few half-hour offset time zones in the world. It covers the island of Newfoundland in Canada and is 30 minutes ahead of Atlantic Standard Time. This unique offset exists because Newfoundland was an independent country until 1949.
Best time to call between MST and NST
Both MST and NST sit inside the 9 AM – 5 PM working day between 9:00 AM–1:30 PM MST, which is 12:30 PM–5:00 PM NST. That gives roughly 4 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
MST and NST overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
MST is 3 hours 30 minutes ahead of NST (MST UTC-07:00 → NST UTC-03:30). The shared working window is 9:00 AM–1:30 PM MST. 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
NST
☀ Currently in DST
Standard: UTC-03:30 · DST: UTC-02:30
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 MST and NST?
MST (MST, UTC-07:00) is 3 hours 30 minutes ahead of NST (NST, UTC-03:30). The gap is currently +3h 30m.
How do I convert MST time to NST time?
Add +3h 30m to MST local time. For example, 9:00 AM in MST is 12:30 PM in NST.
What time is it in NST right now?
NST uses NST at UTC-03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +3h 30m offset from MST.
What is the best time to call NST from MST?
Call between 9:00 AM and 1:30 PM MST — that maps to 12:30 PM–5:00 PM NST and keeps both parties inside the working day.
Which is ahead, MST or NST?
MST is 3 hours 30 minutes ahead of NST. When it is 12:00 PM in MST it is 3:30 PM in NST.
Does daylight saving time affect the MST–NST difference?
Neither zone observes daylight saving time, so the +3h 30m offset between MST and NST 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 NST?
Not normally. The +3h 30m gap only pushes the date over for late-evening times.
What is the time difference between MST and NST?
NST is +3h 30m from MST.
What timezone is MST in?
MST operates on its local timezone.
What timezone is NST in?
NST 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 NST timezone?
Major cities in the NST timezone include St. John's, Corner Brook, Mount Pearl.
What is the UTC offset for NST?
Newfoundland Standard Time (NST) is at UTC-03:30. During daylight saving time, it shifts to NDT.
What should I know about the NST timezone?
NST is one of only a few half-hour offset time zones in the world. Newfoundland joined Canada in 1949 and kept its unique time zone.
When is it midnight in MST, what time is it in NST?
When it is 12:00 AM (midnight) in MST (MST), it is +3h 30m later in NST (NST).
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See every conversion from MST →·See every conversion from NST →