Seoul to Halifax
-12hSeoul
KSTSOURCEHalifax
ADTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and ADT on the World Map
The map below highlights the KST (Korea Standard Time) and ADT (Atlantic Standard Time) timezone regions across the globe.
KST – Korea Standard Time
UTC+09:00Korea Standard Time (KST) is the time zone for South Korea, 9 hours ahead of UTC.
- •South Korea does not observe daylight saving time.
- •Seoul is home to Samsung, LG, and Hyundai headquarters.
- •KST is the same offset as JST (UTC+09:00).
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 Seoul
WikipediaSeoul operates on Korea Standard Time (KST), UTC+9, same as Japan. As a global tech and entertainment hub, Seoul coordinates with East Asian markets.
Seoul has the fastest average internet speed in the world.
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.
Seoul to Halifax Time Difference – Complete Guide
Seoul runs on Korean Standard Time (KST) at UTC+09:00. Halifax runs on Atlantic Daylight Time (ADT) at UTC-03:00, also currently on daylight saving time. That puts Seoul 12 hours behind Halifax — a difference of -12h at the current offsets.
In practice, when it is 9:00 AM in Seoul it is 9:00 PM in Halifax on the previous day. Midnight in Seoul is 12:00 PM in Halifax.Halifax observes daylight saving time while Seoul does not, so the gap narrows or widens by an hour part of the year.
Seoul to Halifax time conversion table
| Seoul (KST) | Halifax (ADT) | Day |
|---|---|---|
| 12:00 AM | 12:00 PM | previous day |
| 6:00 AM | 6:00 PM | previous day |
| 7:00 AM | 7:00 PM | previous day |
| 8:00 AM | 8:00 PM | previous day |
| 9:00 AM | 9:00 PM | previous day |
| 12:00 PM | 12:00 AM | same day |
| 3:00 PM | 3:00 AM | same day |
| 5:00 PM | 5:00 AM | same day |
| 6:00 PM | 6:00 AM | same day |
| 9:00 PM | 9:00 AM | same day |
Why people convert Seoul to Halifax time
- Scheduling a call from Seoul to Halifax: a 10:00 AM start in Seoul lands at 10:00 PM in Halifax the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -12h gap: Seoul and Halifax 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 Halifax is 9:00 PM in Seoul.
- Coordinating a Seoul-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 KST" is unambiguous; "3 PM" across a -12h gap is not.
- With a -12h gap there is no shared 9-to-5 window, so alternate the early start: one week Seoul takes the early slot, the next week Halifax does.
- Halifax: Clocks fall back on Sun, Nov 1, 2026. Any meeting series spanning that date will shift by an hour in local time.
About KST (Korea Standard Time)
Korea Standard Time (KST) is the time zone used in South Korea. It shares the same UTC offset as Japan Standard Time but is a distinct time zone. South Korea does not observe daylight saving time. Seoul, the capital, is a major global tech and business hub.
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 Seoul and Halifax
With a -12h offset there is no overlap inside a normal 9 AM – 5 PM day. Halifax opens at 9:00 AM ADT, which is 9:00 PM in Seoul, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Seoul and Halifax have no shared working hours because of the -12h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Seoul is 12 hours behind Halifax (KST UTC+09:00 → ADT UTC-03:00). 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
Seoul
Does not observe DST
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 Seoul and Halifax?
Seoul (KST, UTC+09:00) is 12 hours behind Halifax (ADT, UTC-03:00). The gap is currently -12h.
How do I convert Seoul time to Halifax time?
Add -12h to Seoul local time. For example, 9:00 AM in Seoul is 9:00 PM in Halifax (previous day).
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 -12h offset from Seoul.
What is the best time to call Halifax from Seoul?
There is no shared working-hours window because of the -12h gap. The closest option is 1:00 PM in Seoul, which is 1:00 AM in Halifax.
Which is behind, Seoul or Halifax?
Seoul is 12 hours behind Halifax. When it is 12:00 PM in Seoul it is 12:00 AM in Halifax.
Do Seoul and Halifax use different time zones?
Seoul (South Korea) uses KST at UTC+09:00, while Halifax (Canada) uses ADT at UTC-03:00. The IANA identifiers are Asia/Seoul and America/Halifax.
Does daylight saving time affect the Seoul–Halifax difference?
Yes at the moment: Halifax is on daylight saving time and Seoul is not, so the -12h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share Seoul's time zone?
KST also covers Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
Which countries use KST, Seoul's zone?
KST is used in South Korea, North Korea.
Is there a day difference between Seoul and Halifax?
Sometimes. The -12h gap is large enough that 8:00 PM or later in Seoul already falls on the in Halifax.
What is the time difference between Seoul and Halifax?
Halifax is -12h from Seoul.
What timezone is Seoul in?
Seoul operates on Korea Standard Time (KST), UTC+9, same as Japan. As a global tech and entertainment hub, Seoul coordinates with East Asian markets.
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 Seoul?
Standard business hours in Seoul are 9:00 AM - 6:00 PM KST.
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 Seoul and Halifax?
The best overlap for a call is when both cities are in business hours. Seoul works 9:00 AM - 6:00 PM KST and Halifax works 9:00 AM - 5:00 PM AST (-12h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Seoul and Halifax?
Seoul uses KRW (₩) while Halifax uses CAD (C$). Check current exchange rates when planning travel or business between these cities.
How do Seoul and Halifax compare in size?
Seoul has a population of approximately 9.7 million (metro: 25.5 million), while Halifax has approximately 440,000 (metro: 465,000).
What are the major landmarks in Seoul and Halifax?
Seoul is known for Gyeongbokgung Palace, N Seoul Tower, Bukchon Hanok Village. Halifax is famous for Halifax Citadel, Peggy's Cove, Halifax Waterfront.
Do Seoul and Halifax have stock exchanges?
Yes. Seoul has the KRX (Korea Exchange) and Halifax has the N/A (Uses TSX). The -12h time difference affects trading hour overlaps between these exchanges.
Which countries use KST (Korea Standard Time)?
KST is used in South Korea, North Korea.
Does KST observe daylight saving time?
No, KST does not observe daylight saving time and remains at UTC+09:00 year-round.
What are some interesting facts about KST?
South Korea does not observe daylight saving time. Seoul is home to Samsung, LG, and Hyundai headquarters.
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 Seoul, what time is it in Halifax?
When it is 12:00 AM (midnight) in Seoul (KST), it is -12h later in Halifax (AST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More Seoul time conversions
- seoul to kst
- seoul to south korea
- seoul to dubai
- seoul to mumbai
- seoul to delhi
- seoul to bangalore
- seoul to kathmandu
- seoul to bangkok
- seoul to singapore
- seoul to hong kong
- seoul to shanghai
- seoul to beijing
- seoul to tokyo
- seoul to osaka
- seoul to new york
- seoul to london
- seoul to sydney
- seoul to los angeles
- seoul to paris
- seoul to berlin
- seoul to toronto
- new york to seoul
- london to seoul
- dubai to seoul
- tokyo to seoul
- singapore to seoul
- sydney to seoul
- los angeles to seoul
- paris to seoul
- delhi to seoul
- mumbai to seoul
- berlin to seoul
- hong kong to seoul
- toronto to seoul
- kathmandu to seoul
See every conversion from Seoul →·See every conversion from Halifax →