Seoul to CST
-15hSeoul
KSTSOURCECST
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 (Central 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 – Central Standard Time
UTC-06:00Central Standard Time (CST) is the time zone for the central United States, Canada, and Mexico, 6 hours behind UTC.
- •CST covers 20 US states fully or partially.
- •Chicago and Houston are the two largest cities in the Central Time Zone.
- •Mexico City, one of the world's most populous cities, operates on CST.
- •CST is 1 hour behind EST and 2 hours ahead of PST.
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.
Seoul vs CST: Offsets, DST and Best Call Times
Seoul runs on Korean Standard Time (KST) at UTC+09:00. CST runs on Central Standard Time (CST) at UTC-06:00. That puts Seoul 15 hours behind CST — a difference of -15h at the current offsets.
In practice, when it is 9:00 AM in Seoul it is 6:00 PM in CST on the previous day. Midnight in Seoul is 9:00 AM in CST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Seoul to CST time conversion table
| Seoul (KST) | CST (CST) | Day |
|---|---|---|
| 12:00 AM | 9:00 AM | previous day |
| 6:00 AM | 3:00 PM | previous day |
| 7:00 AM | 4:00 PM | previous day |
| 8:00 AM | 5:00 PM | previous day |
| 9:00 AM | 6:00 PM | previous day |
| 12:00 PM | 9:00 PM | previous day |
| 3:00 PM | 12:00 AM | same day |
| 5:00 PM | 2:00 AM | same day |
| 6:00 PM | 3:00 AM | same day |
| 9:00 PM | 6:00 AM | same day |
Why people convert Seoul to CST time
- Scheduling a call from Seoul to CST: a 10:00 AM start in Seoul lands at 7:00 PM in CST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -15h gap: Seoul and CST 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 CST is 6:00 PM in Seoul.
- Booking travel or deliveries: tracking CST local time against Seoul keeps pickup windows and arrival estimates honest across the -15h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM KST" is unambiguous; "3 PM" across a -15h gap is not.
- With a -15h gap there is no shared 9-to-5 window, so alternate the early start: one week Seoul takes the early slot, the next week CST 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 CST (Central Standard Time)
Central Standard Time (CST) covers the central region of North America. It is the second most populous time zone in the US, including major cities like Chicago, Houston, and Dallas. CST is also used in Mexico City and much of Central America including Guatemala, Honduras, El Salvador, and Costa Rica. During summer, most of the US and Canada switch to Central Daylight Time (CDT, UTC-05:00), while Mexico and Central American countries generally remain on CST.
Best time to call between Seoul and CST
With a -15h offset there is no overlap inside a normal 9 AM – 5 PM day. CST opens at 9:00 AM CST, which is 6:00 PM in Seoul, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Seoul and CST have no shared working hours because of the -15h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Seoul is 15 hours behind CST (KST UTC+09:00 → CST UTC-06:00). 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
CST
☀ Currently in DST
Standard: UTC-06:00 · DST: UTC-05:00
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 CST?
Seoul (KST, UTC+09:00) is 15 hours behind CST (CST, UTC-06:00). The gap is currently -15h.
How do I convert Seoul time to CST time?
Add -15h to Seoul local time. For example, 9:00 AM in Seoul is 6:00 PM in CST (previous day).
What time is it in CST right now?
CST uses CST at UTC-06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -15h offset from Seoul.
What is the best time to call CST from Seoul?
There is no shared working-hours window because of the -15h gap. The closest option is 1:00 PM in Seoul, which is 10:00 PM in CST.
Which is behind, Seoul or CST?
Seoul is 15 hours behind CST. When it is 12:00 PM in Seoul it is 9:00 PM in CST.
Do Seoul and CST use different time zones?
Seoul (South Korea) uses KST at UTC+09:00, while CST uses CST at UTC-06:00. The IANA identifiers are Asia/Seoul and America/Chicago.
Does daylight saving time affect the Seoul–CST difference?
Neither zone observes daylight saving time, so the -15h offset between Seoul and CST 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 CST?
Sometimes. The -15h gap is large enough that 8:00 PM or later in Seoul already falls on the in CST.
What is the time difference between Seoul and CST?
CST is -15h 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 CST in?
CST 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 CST timezone?
Major cities in the CST timezone include Chicago, Houston, Dallas, San Antonio, Mexico City, Austin, Winnipeg, Memphis.
What is the UTC offset for CST?
Central Standard Time (CST) is at UTC-06:00. During daylight saving time, it shifts to CDT.
What should I know about the CST timezone?
CST covers 20 US states fully or partially. Chicago and Houston are the two largest cities in the Central Time Zone.
When is it midnight in Seoul, what time is it in CST?
When it is 12:00 AM (midnight) in Seoul (KST), it is -15h later in CST (CST).
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