London to Halifax
-4hLondon
BSTSOURCEHalifax
ADTGreen rows indicate typical business hours (9 AM - 5 PM)
BST and ADT on the World Map
The map below highlights the BST (Greenwich Mean Time) and ADT (Atlantic Standard Time) timezone regions across the globe.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
- •The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
- •GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
- •Iceland uses GMT year-round and never observes daylight saving time.
- •The UK switches from GMT to BST (British Summer Time) in late March each year.
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 London
WikipediaLondon, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
Big Ben is actually the name of the bell inside the Elizabeth Tower, not the tower itself.
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: London and Halifax
London runs on British Summer Time (BST) at UTC+01:00, currently observing daylight saving time. Halifax runs on Atlantic Daylight Time (ADT) at UTC-03:00, also currently on daylight saving time. That puts London 4 hours behind Halifax — a difference of -4h at the current offsets.
In practice, when it is 9:00 AM in London it is 5:00 AM in Halifax. Midnight in London is 8:00 PM in Halifax. Because both zones shift for daylight saving, the gap between them only changes during the few weeks each year when their transition dates differ.
London to Halifax time conversion table
| London (BST) | Halifax (ADT) | Day |
|---|---|---|
| 12:00 AM | 8:00 PM | previous day |
| 6:00 AM | 2:00 AM | same day |
| 7:00 AM | 3:00 AM | same day |
| 8:00 AM | 4:00 AM | same day |
| 9:00 AM | 5:00 AM | same day |
| 12:00 PM | 8:00 AM | same day |
| 3:00 PM | 11:00 AM | same day |
| 5:00 PM | 1:00 PM | same day |
| 6:00 PM | 2:00 PM | same day |
| 9:00 PM | 5:00 PM | same day |
Why people convert London to Halifax time
- Scheduling a call from London to Halifax: a 10:00 AM start in London lands at 6:00 AM in Halifax, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both London and Halifax are inside the 9-to-5 working day between 1:00 PM and 5:00 PM BST time (9:00 AM–1:00 PM ADT). That is roughly 4 hours of usable overlap.
- Booking travel or deliveries: tracking Halifax local time against London keeps pickup windows and arrival estimates honest across the -4h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM BST" is unambiguous; "3 PM" across a -4h gap is not.
- Block 1:00 PM–5:00 PM BST as the recurring meeting window if you work primarily from London and need Halifax colleagues present.
- London: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the -4h gap.
- Halifax: Clocks fall back on Sun, Nov 1, 2026. Any meeting series spanning that date will shift by an hour in local time.
About GMT (Greenwich Mean Time)
Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.
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 London and Halifax
Both London and Halifax sit inside the 9 AM – 5 PM working day between 1:00 PM–5:00 PM BST, which is 9:00 AM–1:00 PM ADT. That gives roughly 4 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
London and Halifax overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
London is 4 hours behind Halifax (BST UTC+01:00 → ADT UTC-03:00). The shared working window is 1:00 PM–5:00 PM BST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
London
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 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 London and Halifax?
London (BST, UTC+01:00) is 4 hours behind Halifax (ADT, UTC-03:00). The gap is currently -4h.
How do I convert London time to Halifax time?
Add -4h to London local time. For example, 9:00 AM in London is 5:00 AM 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 London.
What is the best time to call Halifax from London?
Call between 1:00 PM and 5:00 PM BST — that maps to 9:00 AM–1:00 PM ADT and keeps both parties inside the working day.
Which is behind, London or Halifax?
London is 4 hours behind Halifax. When it is 12:00 PM in London it is 8:00 AM in Halifax.
Do London and Halifax use different time zones?
London (UK) uses BST at UTC+01:00, while Halifax (Canada) uses ADT at UTC-03:00. The IANA identifiers are Europe/London and America/Halifax.
Does daylight saving time affect the London–Halifax difference?
Both zones observe DST, so the difference stays at -4h for most of the year and only changes during the weeks when their transition dates do not line up.
Which other cities share London's time zone?
BST also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.
Which countries use BST, London's zone?
BST is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.
Is there a day difference between London and Halifax?
Not normally. The -4h gap only pushes the date over the previous day.
What is the time difference between London and Halifax?
Halifax is -4h from London.
What timezone is London in?
London, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
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 London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
What are the business hours in Halifax?
Standard business hours in Halifax are 9:00 AM - 5:00 PM AST.
What is the best time to schedule a call between London and Halifax?
The best overlap for a call is when both cities are in business hours. London works 9:00 AM - 5:00 PM GMT and Halifax works 9:00 AM - 5:00 PM AST (-4h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in London and Halifax?
London uses GBP (£) while Halifax uses CAD (C$). Check current exchange rates when planning travel or business between these cities.
How do London and Halifax compare in size?
London has a population of approximately 8.8 million (metro: 14.8 million), while Halifax has approximately 440,000 (metro: 465,000).
What are the major landmarks in London and Halifax?
London is known for Big Ben, Tower Bridge, Buckingham Palace. Halifax is famous for Halifax Citadel, Peggy's Cove, Halifax Waterfront.
Do London and Halifax have stock exchanges?
Yes. London has the LSE (London Stock Exchange) and Halifax has the N/A (Uses TSX). The -4h time difference affects trading hour overlaps between these exchanges.
Which countries use GMT (Greenwich Mean Time)?
GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.
Does GMT observe daylight saving time?
Yes, GMT switches to BST during summer months.
What are some interesting facts about GMT?
GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
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 London, what time is it in Halifax?
When it is 12:00 AM (midnight) in London (GMT), it is -4h later in Halifax (AST).
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