Halifax to HST
-7hHalifax
ADTSOURCEHST
HSTGreen rows indicate typical business hours (9 AM - 5 PM)
ADT and HST on the World Map
The map below highlights the ADT (Atlantic Standard Time) and HST (Hawaii Standard Time) timezone regions across the globe.
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.
HST – Hawaii Standard Time
UTC-10:00Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.
- •Hawaii does not observe daylight saving time.
- •HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
- •Hawaii is one of only two US states that don't observe DST (the other is Arizona).
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.
Understanding the -7h Gap: Halifax vs HST
Halifax runs on Atlantic Daylight Time (ADT) at UTC-03:00, currently observing daylight saving time. HST runs on Hawaii Standard Time (HST) at UTC-10:00. That puts Halifax 7 hours behind HST — a difference of -7h at the current offsets.
In practice, when it is 9:00 AM in Halifax it is 2:00 AM in HST. Midnight in Halifax is 5:00 PM in HST.Halifax observes daylight saving time while HST does not, so the gap narrows or widens by an hour part of the year.
Halifax to HST time conversion table
| Halifax (ADT) | HST (HST) | Day |
|---|---|---|
| 12:00 AM | 5:00 PM | previous day |
| 6:00 AM | 11:00 PM | previous day |
| 7:00 AM | 12:00 AM | same day |
| 8:00 AM | 1:00 AM | same day |
| 9:00 AM | 2:00 AM | same day |
| 12:00 PM | 5:00 AM | same day |
| 3:00 PM | 8:00 AM | same day |
| 5:00 PM | 10:00 AM | same day |
| 6:00 PM | 11:00 AM | same day |
| 9:00 PM | 2:00 PM | same day |
Why people convert Halifax to HST time
- Scheduling a call from Halifax to HST: a 10:00 AM start in Halifax lands at 3:00 AM in HST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Halifax and HST are inside the 9-to-5 working day between 4:00 PM and 5:00 PM ADT time (9:00 AM–10:00 AM HST). That is roughly 1 hours of usable overlap.
- Coordinating a Halifax-based team with HST 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 ADT" is unambiguous; "3 PM" across a -7h gap is not.
- Block 4:00 PM–5:00 PM ADT as the recurring meeting window if you work primarily from Halifax and need HST colleagues present.
- Halifax: Clocks fall back on Sun, Nov 1, 2026. Re-check this page after that date because the offset changes and so does the -7h gap.
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.
About HST (Hawaii Standard Time)
Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.
Best time to call between Halifax and HST
Both Halifax and HST sit inside the 9 AM – 5 PM working day between 4:00 PM–5:00 PM ADT, which is 9:00 AM–10:00 AM HST. That gives roughly 1 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Halifax and HST overlap for only 60 minutes (4:00 PM–5:00 PM ADT), so meetings have to be booked precisely.
Halifax is 7 hours behind HST (ADT UTC-03:00 → HST UTC-10:00). The shared working window is 4:00 PM–5:00 PM ADT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Halifax
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
HST
Does not observe DST
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 Halifax and HST?
Halifax (ADT, UTC-03:00) is 7 hours behind HST (HST, UTC-10:00). The gap is currently -7h.
How do I convert Halifax time to HST time?
Add -7h to Halifax local time. For example, 9:00 AM in Halifax is 2:00 AM in HST.
What time is it in HST right now?
HST uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -7h offset from Halifax.
What is the best time to call HST from Halifax?
Call between 4:00 PM and 5:00 PM ADT — that maps to 9:00 AM–10:00 AM HST and keeps both parties inside the working day.
Which is behind, Halifax or HST?
Halifax is 7 hours behind HST. When it is 12:00 PM in Halifax it is 5:00 AM in HST.
Do Halifax and HST use different time zones?
Halifax (Canada) uses ADT at UTC-03:00, while HST uses HST at UTC-10:00. The IANA identifiers are America/Halifax and Pacific/Honolulu.
Does daylight saving time affect the Halifax–HST difference?
Yes at the moment: Halifax is on daylight saving time and HST is not, so the -7h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share Halifax's time zone?
ADT also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use ADT, Halifax's zone?
ADT is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between Halifax and HST?
Not normally. The -7h gap only pushes the date over the previous day.
What is the time difference between Halifax and HST?
HST is -7h from Halifax.
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 timezone is HST in?
HST operates on its local timezone.
What are the business hours in Halifax?
Standard business hours in Halifax are 9:00 AM - 5:00 PM AST.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
Which cities are in the HST timezone?
Major cities in the HST timezone include Honolulu, Hilo, Kailua, Pearl City, Kapolei.
What is the UTC offset for HST?
Hawaii Standard Time (HST) is at UTC-10:00.
What should I know about the HST timezone?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
When is it midnight in Halifax, what time is it in HST?
When it is 12:00 AM (midnight) in Halifax (AST), it is -7h later in HST (HST).
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