Seoul to Mattoon time converter

Mattoon is 14 hours behind Seoul. When it is 9:00 AM in Seoul, it is 7:00 PM (Mon, Oct 19) in Mattoon.

Seoul KST

Tuesday, October 20, 2026

Mattoon CDT

Monday, October 19, 2026

Seoul
South Korea
Tue, Oct 20
KSTUTC+9
Mattoon
Illinois, United States
Mon, Oct 19
CDTUTC-5-14h
Finding your time zone…
Shared working hours (9:00–18:00)

Seoul to Mattoon conversion table

Every hour of today in Seoul and the matching time in Mattoon. Light rows are typical working hours (9:00–18:00).

SeoulMattoon
12:00 AM10:00 AM−1 day
1:00 AM11:00 AM−1 day
2:00 AM12:00 PM−1 day
3:00 AM1:00 PM−1 day
4:00 AM2:00 PM−1 day
5:00 AM3:00 PM−1 day
6:00 AM4:00 PM−1 day
7:00 AM5:00 PM−1 day
8:00 AM6:00 PM−1 day
9:00 AM7:00 PM−1 day
10:00 AM8:00 PM−1 day
11:00 AM9:00 PM−1 day
12:00 PM10:00 PM−1 day
1:00 PM11:00 PM−1 day
2:00 PM12:00 AM
3:00 PM1:00 AM
4:00 PM2:00 AM
5:00 PM3:00 AM
6:00 PM4:00 AM
7:00 PM5:00 AM
8:00 PM6:00 AM
9:00 PM7:00 AM
10:00 PM8:00 AM
11:00 PM9:00 AM

Best time to call or meet

Working hours don't overlap fully. The closest fit is 7:00 AM – 8:00 AM in Seoul (5:00 PM – 6:00 PM in Mattoon): working hours on one side, early or late on the other.

Daylight saving time and the difference

The difference changes during the year because Seoul and Mattoon switch clocks on different dates:

  • Oct 20, 2026 – Nov 1, 2026: -14h
  • Nov 1, 2026 – Mar 14, 2027: -15h
  • Mar 14, 2027 – Oct 20, 2027: -14h

Distance

Seoul and Mattoon are 10,718 km (6,660 miles) apart in a straight line.

More conversions

Mattoon to SeoulSeoul to New YorkSeoul to LondonSeoul to Los AngelesSeoul to ChicagoSeoul to TorontoSeoul to São PauloSeoul to ParisSeoul to BerlinSeoul to MoscowSeoul to DubaiSeoul to New DelhiSeoul to Bangkok
New York to MattoonLondon to MattoonLos Angeles to MattoonChicago to MattoonToronto to MattoonSão Paulo to MattoonParis to MattoonBerlin to MattoonMoscow to MattoonDubai to MattoonNew Delhi to MattoonBangkok to Mattoon

Questions and answers

What is the time difference between Seoul and Mattoon?

Mattoon is 14 hours behind Seoul.

What time is it in Mattoon when it is 9 AM in Seoul?

When it is 9:00 AM in Seoul, it is 7:00 PM (Mon, Oct 19) in Mattoon.

When is the best time to call Mattoon from Seoul?

Working hours don't overlap fully. The closest fit is 7:00 AM – 8:00 AM in Seoul (5:00 PM – 6:00 PM in Mattoon): working hours on one side, early or late on the other.

Does the time difference between Seoul and Mattoon change?

Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.