South Korea to Tokyo
+0hSouth Korea
KSTSOURCETokyo
JSTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and JST on the World Map
The map below highlights the KST (Korea Standard Time) and JST (Japan 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).
JST – Japan Standard Time
UTC+09:00Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.
- •Japan does not observe daylight saving time.
- •Tokyo is the most populous metropolitan area in the world.
- •The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
- •JST is 14 hours ahead of EST and 9 hours ahead of GMT.
About Tokyo
WikipediaTokyo operates on Japan Standard Time (JST), which is 14 hours ahead of New York. As Asia's largest financial hub, Tokyo trading hours are crucial for global markets.
The Tokyo subway system moves approximately 8.7 million passengers daily.
Understanding the +0h Gap: South Korea vs Tokyo
South Korea runs on Korean Standard Time (KST) at UTC+09:00. Tokyo runs on Japan Standard Time (JST) at UTC+09:00. That puts South Korea no time difference Tokyo — a difference of +0h at the current offsets.
In practice, when it is 9:00 AM in South Korea it is 9:00 AM in Tokyo. Midnight in South Korea is 12:00 AM in Tokyo. Neither zone observes daylight saving time, so the offset between them stays constant all year.
South Korea to Tokyo time conversion table
| South Korea (KST) | Tokyo (JST) | Day |
|---|---|---|
| 12:00 AM | 12:00 AM | same day |
| 6:00 AM | 6:00 AM | same day |
| 7:00 AM | 7:00 AM | same day |
| 8:00 AM | 8:00 AM | same day |
| 9:00 AM | 9:00 AM | same day |
| 12:00 PM | 12:00 PM | same day |
| 3:00 PM | 3:00 PM | same day |
| 5:00 PM | 5:00 PM | same day |
| 6:00 PM | 6:00 PM | same day |
| 9:00 PM | 9:00 PM | same day |
Why people convert South Korea to Tokyo time
- Scheduling a call from South Korea to Tokyo: a 10:00 AM start in South Korea lands at 10:00 AM in Tokyo, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both South Korea and Tokyo are inside the 9-to-5 working day between 9:00 AM and 5:00 PM KST time (9:00 AM–5:00 PM JST). That is roughly 8 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in South Korea is 8:00 PM in Tokyo makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM KST" is unambiguous; "3 PM" across a +0h gap is not.
- Block 9:00 AM–5:00 PM KST as the recurring meeting window if you work primarily from South Korea and need Tokyo colleagues present.
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 JST (Japan Standard Time)
Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.
Best time to call between South Korea and Tokyo
Both South Korea and Tokyo sit inside the 9 AM – 5 PM working day between 9:00 AM–5:00 PM KST, which is 9:00 AM–5:00 PM JST. That gives roughly 8 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
South Korea and Tokyo share 8 hours of working-hours overlap (9:00 AM–5:00 PM KST), so scheduling a live meeting is straightforward.
South Korea is no time difference Tokyo (KST UTC+09:00 → JST UTC+09:00). The shared working window is 9:00 AM–5:00 PM KST. Remember to re-check around daylight-saving transitions.
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 South Korea and Tokyo?
South Korea (KST, UTC+09:00) is no time difference Tokyo (JST, UTC+09:00). The gap is currently +0h.
How do I convert South Korea time to Tokyo time?
Add +0h to South Korea local time. For example, 9:00 AM in South Korea is 9:00 AM in Tokyo.
What time is it in Tokyo right now?
Tokyo uses JST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +0h offset from South Korea.
What is the best time to call Tokyo from South Korea?
Call between 9:00 AM and 5:00 PM KST — that maps to 9:00 AM–5:00 PM JST and keeps both parties inside the working day.
Which is ahead, South Korea or Tokyo?
South Korea and Tokyo are currently on the same clock.
Do South Korea and Tokyo use different time zones?
South Korea (South Korea) uses KST at UTC+09:00, while Tokyo (Japan) uses JST at UTC+09:00. The IANA identifiers are Asia/Seoul and Asia/Tokyo.
Does daylight saving time affect the South Korea–Tokyo difference?
Neither zone observes daylight saving time, so the +0h offset between South Korea and Tokyo is fixed all year.
Which other cities share South Korea's time zone?
KST also covers Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
Which countries use KST, South Korea's zone?
KST is used in South Korea, North Korea.
What is the time difference between South Korea and Tokyo?
Tokyo is +0h from South Korea.
What timezone is South Korea in?
South Korea operates on its local timezone.
What timezone is Tokyo in?
Tokyo operates on Japan Standard Time (JST), which is 14 hours ahead of New York. As Asia's largest financial hub, Tokyo trading hours are crucial for global markets.
What are the business hours in Tokyo?
Standard business hours in Tokyo are 9:00 AM - 6:00 PM JST.
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 JST timezone?
Major cities in the JST timezone include Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka.
What is the UTC offset for JST?
Japan Standard Time (JST) is at UTC+09:00.
What should I know about the JST timezone?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
When is it midnight in South Korea, what time is it in Tokyo?
When it is 12:00 AM (midnight) in South Korea (KST), it is +0h later in Tokyo (JST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More South Korea time conversions
- south korea to seoul
- south korea to kst
- south korea to new york
- south korea to london
- south korea to dubai
- south korea to singapore
- south korea to sydney
- south korea to los angeles
- south korea to paris
- south korea to delhi
- south korea to mumbai
- south korea to berlin
- south korea to hong kong
- south korea to toronto
- south korea to kathmandu
- new york to south korea
- london to south korea
- dubai to south korea
- tokyo to south korea
- singapore to south korea
- sydney to south korea
- los angeles to south korea
- paris to south korea
- delhi to south korea
- mumbai to south korea
- berlin to south korea
- hong kong to south korea
- toronto to south korea
- kathmandu to south korea
See every conversion from South Korea →·See every conversion from Tokyo →