Seoul to NST
-12h 30mSeoul
KSTSOURCENST
NSTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and NST on the World Map
The map below highlights the KST (Korea Standard Time) and NST (Newfoundland 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).
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.
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.
Comparing Time Zones: Seoul and NST
Seoul runs on Korean Standard Time (KST) at UTC+09:00. NST runs on Newfoundland Standard Time (NST) at UTC-03:30. That puts Seoul 12 hours 30 minutes behind NST — a difference of -12h 30m at the current offsets.
In practice, when it is 9:00 AM in Seoul it is 8:30 PM in NST on the previous day. Midnight in Seoul is 11:30 AM in NST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Seoul to NST time conversion table
| Seoul (KST) | NST (NST) | Day |
|---|---|---|
| 12:00 AM | 11:30 AM | previous day |
| 6:00 AM | 5:30 PM | previous day |
| 7:00 AM | 6:30 PM | previous day |
| 8:00 AM | 7:30 PM | previous day |
| 9:00 AM | 8:30 PM | previous day |
| 12:00 PM | 11:30 PM | previous day |
| 3:00 PM | 2:30 AM | same day |
| 5:00 PM | 4:30 AM | same day |
| 6:00 PM | 5:30 AM | same day |
| 9:00 PM | 8:30 AM | same day |
Why people convert Seoul to NST time
- Scheduling a call from Seoul to NST: a 10:00 AM start in Seoul lands at 9:30 PM in NST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -12h 30m gap: Seoul and NST 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 NST is 8:30 PM in Seoul.
- Booking travel or deliveries: tracking NST local time against Seoul keeps pickup windows and arrival estimates honest across the -12h 30m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM KST" is unambiguous; "3 PM" across a -12h 30m gap is not.
- With a -12h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week Seoul takes the early slot, the next week NST does.
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 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 Seoul and NST
With a -12h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. NST opens at 9:00 AM NST, which is 8:30 PM in Seoul, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Seoul and NST have no shared working hours because of the -12h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
Seoul is 12 hours 30 minutes behind NST (KST UTC+09:00 → NST UTC-03:30). 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
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 Seoul and NST?
Seoul (KST, UTC+09:00) is 12 hours 30 minutes behind NST (NST, UTC-03:30). The gap is currently -12h 30m.
How do I convert Seoul time to NST time?
Add -12h 30m to Seoul local time. For example, 9:00 AM in Seoul is 8:30 PM in NST (previous day).
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 -12h 30m offset from Seoul.
What is the best time to call NST from Seoul?
There is no shared working-hours window because of the -12h 30m gap. The closest option is 1:00 PM in Seoul, which is 12:30 AM in NST.
Which is behind, Seoul or NST?
Seoul is 12 hours 30 minutes behind NST. When it is 12:00 PM in Seoul it is 11:30 PM in NST.
Do Seoul and NST use different time zones?
Seoul (South Korea) uses KST at UTC+09:00, while NST uses NST at UTC-03:30. The IANA identifiers are Asia/Seoul and America/St_Johns.
Does daylight saving time affect the Seoul–NST difference?
Neither zone observes daylight saving time, so the -12h 30m offset between Seoul and NST is fixed all year.
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 NST?
Sometimes. The -12h 30m gap is large enough that 8:00 PM or later in Seoul already falls on the in NST.
What is the time difference between Seoul and NST?
NST is -12h 30m 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 NST in?
NST operates on its local timezone.
What are the business hours in Seoul?
Standard business hours in Seoul are 9:00 AM - 6:00 PM KST.
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 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 Seoul, what time is it in NST?
When it is 12:00 AM (midnight) in Seoul (KST), it is -12h 30m later in NST (NST).
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 NST →