Seoul to Mattapan time converter

Mattapan is 13 hours behind Seoul. When it is 9:00 AM in Seoul, it is 8:00 PM (Tue, Oct 20) in Mattapan.

Seoul KST

Wednesday, October 21, 2026

Mattapan EDT

Tuesday, October 20, 2026

Seoul
South Korea
Wed, Oct 21
KSTUTC+9
Mattapan
Massachusetts, United States
Tue, Oct 20
EDTUTC-4-13h
Finding your time zone…
Shared working hours (9:00–18:00)

Seoul to Mattapan conversion table

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

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

Best time to call or meet

Working hours don't overlap fully. The closest fit is 9:00 AM – 11:00 AM in Seoul (8:00 PM – 10:00 PM in Mattapan): 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 Mattapan switch clocks on different dates:

  • Oct 21, 2026 – Nov 1, 2026: -13h
  • Nov 1, 2026 – Mar 14, 2027: -14h
  • Mar 14, 2027 – Oct 21, 2027: -13h

Distance

Seoul and Mattapan are 10,951 km (6,805 miles) apart in a straight line.

More conversions

Mattapan 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 MattapanLondon to MattapanLos Angeles to MattapanChicago to MattapanToronto to MattapanSão Paulo to MattapanParis to MattapanBerlin to MattapanMoscow to MattapanDubai to MattapanNew Delhi to MattapanBangkok to Mattapan

Questions and answers

What is the time difference between Seoul and Mattapan?

Mattapan is 13 hours behind Seoul.

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

When it is 9:00 AM in Seoul, it is 8:00 PM (Tue, Oct 20) in Mattapan.

When is the best time to call Mattapan from Seoul?

Working hours don't overlap fully. The closest fit is 9:00 AM – 11:00 AM in Seoul (8:00 PM – 10:00 PM in Mattapan): working hours on one side, early or late on the other.

Does the time difference between Seoul and Mattapan change?

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