Seoul to Boulder time converter

Boulder is 15 hours behind Seoul. When it is 9:00 AM in Seoul, it is 6:00 PM (Sun, Oct 18) in Boulder.

Seoul KST

Monday, October 19, 2026

Boulder MDT

Sunday, October 18, 2026

Seoul
South Korea
Mon, Oct 19
KSTUTC+9
Boulder
Colorado, United States
Sun, Oct 18
MDTUTC-6-15h
Finding your time zone…
Shared working hours (9:00–18:00)

Seoul to Boulder conversion table

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

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

Best time to call or meet

Working hours don't overlap fully. The closest fit is 7:00 AM – 9:00 AM in Seoul (4:00 PM – 6:00 PM in Boulder): 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 Boulder switch clocks on different dates:

  • Oct 19, 2026 – Nov 1, 2026: -15h
  • Nov 1, 2026 – Mar 14, 2027: -16h
  • Mar 14, 2027 – Oct 19, 2027: -15h

Distance

Seoul and Boulder are 9,878 km (6,138 miles) apart in a straight line.

More conversions

Boulder 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 BoulderLondon to BoulderLos Angeles to BoulderChicago to BoulderToronto to BoulderSão Paulo to BoulderParis to BoulderBerlin to BoulderMoscow to BoulderDubai to BoulderNew Delhi to BoulderBangkok to Boulder

Questions and answers

What is the time difference between Seoul and Boulder?

Boulder is 15 hours behind Seoul.

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

When it is 9:00 AM in Seoul, it is 6:00 PM (Sun, Oct 18) in Boulder.

When is the best time to call Boulder from Seoul?

Working hours don't overlap fully. The closest fit is 7:00 AM – 9:00 AM in Seoul (4:00 PM – 6:00 PM in Boulder): working hours on one side, early or late on the other.

Does the time difference between Seoul and Boulder change?

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