Seoul to Shanghai
-1hSeoul
KSTSOURCEShanghai
CSTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and CST on the World Map
The map below highlights the KST (Korea Standard Time) and CST (China 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).
CST – China Standard Time
UTC+08:00China Standard Time (CST) covers all of mainland China, 8 hours ahead of UTC.
- •China uses a single time zone despite spanning 5 geographical zones.
- •In Xinjiang (western China), sunset can be as late as midnight in summer.
- •China abolished daylight saving time in 1991.
- •The Shanghai Stock Exchange operates on CST/Beijing Time.
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 Shanghai
WikipediaShanghai operates on China Standard Time (CST), UTC+8. As China's economic powerhouse and home to the SSE, Shanghai time is essential for global investors.
The Maglev train from Shanghai airport reaches 431 km/h, the fastest commercial train in the world.
Comparing Time Zones: Seoul and Shanghai
Seoul runs on Korean Standard Time (KST) at UTC+09:00. Shanghai runs on China Standard Time (CST) at UTC+08:00. That puts Seoul 1 hour behind Shanghai — a difference of -1h at the current offsets.
In practice, when it is 9:00 AM in Seoul it is 8:00 AM in Shanghai. Midnight in Seoul is 11:00 PM in Shanghai. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Seoul to Shanghai time conversion table
| Seoul (KST) | Shanghai (CST) | Day |
|---|---|---|
| 12:00 AM | 11:00 PM | previous day |
| 6:00 AM | 5:00 AM | same day |
| 7:00 AM | 6:00 AM | same day |
| 8:00 AM | 7:00 AM | same day |
| 9:00 AM | 8:00 AM | same day |
| 12:00 PM | 11:00 AM | same day |
| 3:00 PM | 2:00 PM | same day |
| 5:00 PM | 4:00 PM | same day |
| 6:00 PM | 5:00 PM | same day |
| 9:00 PM | 8:00 PM | same day |
Why people convert Seoul to Shanghai time
- Scheduling a call from Seoul to Shanghai: a 10:00 AM start in Seoul lands at 9:00 AM in Shanghai, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Seoul and Shanghai are inside the 9-to-5 working day between 10:00 AM and 5:00 PM KST time (9:00 AM–4:00 PM CST). That is roughly 7 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in Seoul is 7:00 PM in Shanghai 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 -1h gap is not.
- Block 10:00 AM–5:00 PM KST as the recurring meeting window if you work primarily from Seoul and need Shanghai 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 CST (China Standard Time)
China Standard Time (CST, also known as Beijing Time) is used across all of mainland China despite the country spanning five geographical time zones. This single-timezone policy was adopted in 1949. China does not observe daylight saving time. CST is shared with Hong Kong (HKT), Macau, Taiwan, Singapore, Malaysia, and the Philippines, making UTC+08:00 one of the most used offsets in the world.
Best time to call between Seoul and Shanghai
Both Seoul and Shanghai sit inside the 9 AM – 5 PM working day between 10:00 AM–5:00 PM KST, which is 9:00 AM–4:00 PM CST. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Seoul and Shanghai share 7 hours of working-hours overlap (10:00 AM–5:00 PM KST), so scheduling a live meeting is straightforward.
Seoul is 1 hour behind Shanghai (KST UTC+09:00 → CST UTC+08:00). The shared working window is 10:00 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 Shanghai?
Seoul (KST, UTC+09:00) is 1 hour behind Shanghai (CST, UTC+08:00). The gap is currently -1h.
How do I convert Seoul time to Shanghai time?
Add -1h to Seoul local time. For example, 9:00 AM in Seoul is 8:00 AM in Shanghai.
What time is it in Shanghai right now?
Shanghai uses CST at UTC+08:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h offset from Seoul.
What is the best time to call Shanghai from Seoul?
Call between 10:00 AM and 5:00 PM KST — that maps to 9:00 AM–4:00 PM CST and keeps both parties inside the working day.
Which is behind, Seoul or Shanghai?
Seoul is 1 hour behind Shanghai. When it is 12:00 PM in Seoul it is 11:00 AM in Shanghai.
Do Seoul and Shanghai use different time zones?
Seoul (South Korea) uses KST at UTC+09:00, while Shanghai (China) uses CST at UTC+08:00. The IANA identifiers are Asia/Seoul and Asia/Shanghai.
Does daylight saving time affect the Seoul–Shanghai difference?
Neither zone observes daylight saving time, so the -1h offset between Seoul and Shanghai 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 Shanghai?
Not normally. The -1h gap only pushes the date over the previous day.
What is the time difference between Seoul and Shanghai?
Shanghai is -1h 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 Shanghai in?
Shanghai operates on China Standard Time (CST), UTC+8. As China's economic powerhouse and home to the SSE, Shanghai time is essential for global investors.
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 Shanghai?
Standard business hours in Shanghai are 9:00 AM - 6:00 PM CST.
What is the best time to schedule a call between Seoul and Shanghai?
The best overlap for a call is when both cities are in business hours. Seoul works 9:00 AM - 6:00 PM KST and Shanghai works 9:00 AM - 6:00 PM CST (-1h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Seoul and Shanghai?
Seoul uses KRW (₩) while Shanghai uses CNY (¥). Check current exchange rates when planning travel or business between these cities.
How do Seoul and Shanghai compare in size?
Seoul has a population of approximately 9.7 million (metro: 25.5 million), while Shanghai has approximately 24.9 million (metro: 28.5 million).
What are the major landmarks in Seoul and Shanghai?
Seoul is known for Gyeongbokgung Palace, N Seoul Tower, Bukchon Hanok Village. Shanghai is famous for The Bund, Oriental Pearl Tower, Yu Garden.
Do Seoul and Shanghai have stock exchanges?
Yes. Seoul has the KRX (Korea Exchange) and Shanghai has the SSE (Shanghai Stock Exchange). The -1h 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 CST timezone?
Major cities in the CST timezone include Shanghai, Beijing, Shenzhen, Guangzhou, Chengdu, Hong Kong, Taipei, Wuhan.
What is the UTC offset for CST?
China Standard Time (CST) is at UTC+08:00.
What should I know about the CST timezone?
China uses a single time zone despite spanning 5 geographical zones. In Xinjiang (western China), sunset can be as late as midnight in summer.
When is it midnight in Seoul, what time is it in Shanghai?
When it is 12:00 AM (midnight) in Seoul (KST), it is -1h later in Shanghai (CST).
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