No overlap — one side will join outside working hours
KST (Seoul)
CDT (Chicago)
00:00
10:00-1dWorking
01:00
11:00-1dWorking
02:00
12:00-1dWorking
03:00
13:00-1dWorking
04:00
14:00-1dWorking
05:00
15:00-1dWorking
06:00
16:00-1dWorking
07:00
17:00-1d
08:00
18:00-1d
09:00Working
19:00-1doff
10:00Working
20:00-1doff
11:00Working
21:00-1doff
12:00Working
22:00-1doff
13:00Working
23:00-1doff
14:00Working
00:00off
15:00Working
01:00off
16:00Working
02:00off
17:00
03:00
18:00
04:00
19:00
05:00
20:00
06:00
21:00
07:00
22:00
08:00
23:00
09:00Working
Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between kst and cdt?
Korea Standard Time (kst) is UTC+9 and Central Daylight Time (cdt) is UTC-5. The difference between them is 14 hours.
Where is kst used?
Korea Standard Time (kst) is used in South Korea and surrounding regions. The IANA timezone identifier is Asia/Seoul.
Where is cdt used?
Central Daylight Time (cdt) is used in USA and surrounding regions. The IANA timezone identifier is America/Chicago.
How do I convert kst to cdt?
Use the interactive converter above. Drag the time slider to any kst time and the cdt equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
KST (Seoul) is 14 hours ahead of CDT (Chicago). When it's noon in KST (Seoul), it's 22:00 in CDT (Chicago).
KST (Seoul) runs on Asia/Seoul; CDT (Chicago) runs on America/Chicago. Together they are 14 hours apart.
Business hours comparison
There is no business hours overlap between KST (Seoul) and CDT (Chicago) during standard working hours (9:00–17:00). Meetings would require one party to work outside normal hours.
Best call times between these locations
KST (Seoul) and CDT (Chicago) have no shared working window. These slots minimize out-of-hours disruption for both sides.
06:00 Seoul / 16:00 Chicago⚡ One side off-hours
⚠️ 3h before working hours in Seoul
09:00 Seoul / 19:00 Chicago⚡ One side off-hours
⚠️ 3h after working hours in Chicago
05:00 Seoul / 15:00 Chicago⚡ One side off-hours
⚠️ 4h before working hours in Seoul
Working hours defined as 09:00–17:00 local time for each location.
Public holidays this year
⚡ Upcoming holidays in both locations, confirm with your contact before booking.
KST (Seoul)7 holidays
Aug 15Liberation Day
Sep 24Chuseok
Sep 25Chuseok
Sep 26Chuseok
Oct 3National Foundation Day
CDT (Chicago)7 holidays
Jul 3Independence DaySOON
Sep 7Labour Day
Oct 12Columbus Day
Oct 12Indigenous Peoples' Day
Nov 11Veterans Day
KST (Seoul) and CDT (Chicago) — practical scheduling
Teams in KST (Seoul) (South Korea) and CDT (Chicago) (USA) deal with a 14-hour gap that pushes their working days apart. Real-time meetings always require someone to stretch outside the standard 9–5.
💡 Practical scheduling guidelines
⚡
A 06:00 meeting in KST (Seoul) means 16:00 in CDT (Chicago) (3h before working hours in Seoul).
⚡
A 09:00 meeting in KST (Seoul) means 19:00 in CDT (Chicago) (3h after working hours in Chicago).
⚡
A 05:00 meeting in KST (Seoul) means 15:00 in CDT (Chicago) (4h before working hours in Seoul).
With no shared business hours, these slots distribute the scheduling burden as evenly as possible between both locations.
Avoid scheduling mistakes — especially around daylight saving changes. Use the ClockinSync Chrome Extension to instantly verify and compare both time zones directly in your browser, without manual calculations.
Need a specific time? Use the slider or type directly into the input bar — it understands "3pm", "15:30", and location-specific formats like "9am KST (Seoul)".
