MST to Halifax
+4hMST
MSTSOURCEHalifax
ADTGreen rows indicate typical business hours (9 AM - 5 PM)
MST and ADT on the World Map
The map below highlights the MST (Mountain Standard Time) and ADT (Atlantic 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.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •Puerto Rico uses AST year-round and does not observe DST.
- •AST is 1 hour ahead of EST.
- •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
About Halifax
WikipediaHalifax operates on Atlantic Time (AST/ADT), UTC-4. As Canada's major Atlantic port and closest city to Europe, Halifax bridges North American and European business.
Halifax harbors the second largest natural ice-free harbor in the world.
Comparing Time Zones: MST and Halifax
MST runs on Mountain Standard Time (MST) at UTC-07:00. Halifax runs on Atlantic Daylight Time (ADT) at UTC-03:00, also currently on daylight saving time. That puts MST 4 hours ahead of Halifax — a difference of +4h at the current offsets.
In practice, when it is 9:00 AM in MST it is 1:00 PM in Halifax. Midnight in MST is 4:00 AM in Halifax.Halifax observes daylight saving time while MST does not, so the gap narrows or widens by an hour part of the year.
MST to Halifax time conversion table
| MST (MST) | Halifax (ADT) | Day |
|---|---|---|
| 12:00 AM | 4:00 AM | same day |
| 6:00 AM | 10:00 AM | same day |
| 7:00 AM | 11:00 AM | same day |
| 8:00 AM | 12:00 PM | same day |
| 9:00 AM | 1:00 PM | same day |
| 12:00 PM | 4:00 PM | same day |
| 3:00 PM | 7:00 PM | same day |
| 5:00 PM | 9:00 PM | same day |
| 6:00 PM | 10:00 PM | same day |
| 9:00 PM | 1:00 AM | next day |
Why people convert MST to Halifax time
- Scheduling a call from MST to Halifax: a 10:00 AM start in MST lands at 2:00 PM in Halifax, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both MST and Halifax are inside the 9-to-5 working day between 9:00 AM and 1:00 PM MST time (1:00 PM–5:00 PM ADT). That is roughly 4 hours of usable overlap.
- Coordinating a MST-based team with Halifax 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 +4h gap is not.
- Block 9:00 AM–1:00 PM MST as the recurring meeting window if you work primarily from MST and need Halifax colleagues present.
- Halifax: Clocks fall back on Sun, Nov 1, 2026. Any meeting series spanning that date will shift by an hour in local time.
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 AST (Atlantic Standard Time)
Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.
Best time to call between MST and Halifax
Both MST and Halifax sit inside the 9 AM – 5 PM working day between 9:00 AM–1:00 PM MST, which is 1:00 PM–5:00 PM ADT. That gives roughly 4 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
MST and Halifax overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
MST is 4 hours ahead of Halifax (MST UTC-07:00 → ADT UTC-03:00). The shared working window is 9:00 AM–1:00 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
Halifax
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
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 MST and Halifax?
MST (MST, UTC-07:00) is 4 hours ahead of Halifax (ADT, UTC-03:00). The gap is currently +4h.
How do I convert MST time to Halifax time?
Add +4h to MST local time. For example, 9:00 AM in MST is 1:00 PM in Halifax.
What time is it in Halifax right now?
Halifax uses ADT at UTC-03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +4h offset from MST.
What is the best time to call Halifax from MST?
Call between 9:00 AM and 1:00 PM MST — that maps to 1:00 PM–5:00 PM ADT and keeps both parties inside the working day.
Which is ahead, MST or Halifax?
MST is 4 hours ahead of Halifax. When it is 12:00 PM in MST it is 4:00 PM in Halifax.
Do MST and Halifax use different time zones?
MST uses MST at UTC-07:00, while Halifax (Canada) uses ADT at UTC-03:00. The IANA identifiers are America/Denver and America/Halifax.
Does daylight saving time affect the MST–Halifax difference?
Yes at the moment: Halifax is on daylight saving time and MST is not, so the +4h gap shifts by an hour when exactly one of them changes clocks.
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 Halifax?
Not normally. The +4h gap only pushes the date over for late-evening times.
What is the time difference between MST and Halifax?
Halifax is +4h from MST.
What timezone is MST in?
MST operates on its local timezone.
What timezone is Halifax in?
Halifax operates on Atlantic Time (AST/ADT), UTC-4. As Canada's major Atlantic port and closest city to Europe, Halifax bridges North American and European business.
What are the business hours in Halifax?
Standard business hours in Halifax are 9:00 AM - 5:00 PM AST.
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 AST timezone?
Major cities in the AST timezone include Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
What is the UTC offset for AST?
Atlantic Standard Time (AST) is at UTC-04:00. During daylight saving time, it shifts to ADT.
What should I know about the AST timezone?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
When is it midnight in MST, what time is it in Halifax?
When it is 12:00 AM (midnight) in MST (MST), it is +4h later in Halifax (AST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More MST time conversions
- mst to denver
- mst to mdt
- mst to new york
- mst to london
- mst to dubai
- mst to tokyo
- mst to singapore
- mst to sydney
- mst to los angeles
- mst to paris
- mst to delhi
- mst to mumbai
- mst to berlin
- mst to hong kong
- mst to toronto
- mst to kathmandu
- new york to mst
- london to mst
- dubai to mst
- tokyo to mst
- singapore to mst
- sydney to mst
- los angeles to mst
- paris to mst
- delhi to mst
- mumbai to mst
- berlin to mst
- hong kong to mst
- toronto to mst
- kathmandu to mst
See every conversion from MST →·See every conversion from Halifax →