Seoul to Osaka
+0hSeoul
KSTSOURCEOsaka
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 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 Osaka
WikipediaOsaka operates on Japan Standard Time (JST), UTC+9. As Japan's second economic center and a manufacturing hub, Osaka shares business hours with Tokyo.
Osaka Castle was originally built in 1583 and has been rebuilt several times.
Everything You Need to Know About Seoul and Osaka Time
Seoul runs on Korean Standard Time (KST) at UTC+09:00. Osaka runs on Japan Standard Time (JST) at UTC+09:00. That puts Seoul no time difference Osaka — a difference of +0h at the current offsets.
In practice, when it is 9:00 AM in Seoul it is 9:00 AM in Osaka. Midnight in Seoul is 12:00 AM in Osaka. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Seoul to Osaka time conversion table
| Seoul (KST) | Osaka (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 Seoul to Osaka time
- Scheduling a call from Seoul to Osaka: a 10:00 AM start in Seoul lands at 10:00 AM in Osaka, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Seoul and Osaka 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.
- Coordinating a Seoul-based team with Osaka 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 +0h gap is not.
- Block 9:00 AM–5:00 PM KST as the recurring meeting window if you work primarily from Seoul and need Osaka 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 Seoul and Osaka
Both Seoul and Osaka 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
Seoul and Osaka share 8 hours of working-hours overlap (9:00 AM–5:00 PM KST), so scheduling a live meeting is straightforward.
Seoul is no time difference Osaka (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 Seoul and Osaka?
Seoul (KST, UTC+09:00) is no time difference Osaka (JST, UTC+09:00). The gap is currently +0h.
How do I convert Seoul time to Osaka time?
Add +0h to Seoul local time. For example, 9:00 AM in Seoul is 9:00 AM in Osaka.
What time is it in Osaka right now?
Osaka 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 Seoul.
What is the best time to call Osaka from Seoul?
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, Seoul or Osaka?
Seoul and Osaka are currently on the same clock.
Do Seoul and Osaka use different time zones?
Seoul (South Korea) uses KST at UTC+09:00, while Osaka (Japan) uses JST at UTC+09:00. The IANA identifiers are Asia/Seoul and Asia/Tokyo.
Does daylight saving time affect the Seoul–Osaka difference?
Neither zone observes daylight saving time, so the +0h offset between Seoul and Osaka 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.
What is the time difference between Seoul and Osaka?
Osaka is +0h 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 Osaka in?
Osaka operates on Japan Standard Time (JST), UTC+9. As Japan's second economic center and a manufacturing hub, Osaka shares business hours with Tokyo.
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 Osaka?
Standard business hours in Osaka are 9:00 AM - 6:00 PM JST.
What is the best time to schedule a call between Seoul and Osaka?
The best overlap for a call is when both cities are in business hours. Seoul works 9:00 AM - 6:00 PM KST and Osaka works 9:00 AM - 6:00 PM JST (+0h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Seoul and Osaka?
Seoul uses KRW (₩) while Osaka uses JPY (¥). Check current exchange rates when planning travel or business between these cities.
How do Seoul and Osaka compare in size?
Seoul has a population of approximately 9.7 million (metro: 25.5 million), while Osaka has approximately 2.8 million (metro: 19 million).
What are the major landmarks in Seoul and Osaka?
Seoul is known for Gyeongbokgung Palace, N Seoul Tower, Bukchon Hanok Village. Osaka is famous for Osaka Castle, Dotonbori, Universal Studios Japan.
Do Seoul and Osaka have stock exchanges?
Yes. Seoul has the KRX (Korea Exchange) and Osaka has the OSE (Osaka Exchange - derivatives). The +0h 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 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 Seoul, what time is it in Osaka?
When it is 12:00 AM (midnight) in Seoul (KST), it is +0h later in Osaka (JST).
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