Seoul to Highlands Ranch time converter

Highlands Ranch is 15 hours behind Seoul. When it is 9:00 AM in Seoul, it is 6:00 PM (Tue, Oct 20) in Highlands Ranch.

Seoul KST

Wednesday, October 21, 2026

Highlands Ranch MDT

Tuesday, October 20, 2026

Seoul
South Korea
Wed, Oct 21
KSTUTC+9
Highlands Ranch
Colorado, United States
Tue, Oct 20
MDTUTC-6-15h
Finding your time zone…
Shared working hours (9:00–18:00)

Seoul to Highlands Ranch conversion table

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

SeoulHighlands Ranch
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 Highlands Ranch): 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 Highlands Ranch switch clocks on different dates:

  • Oct 21, 2026 – Nov 1, 2026: -15h
  • Nov 1, 2026 – Mar 14, 2027: -16h
  • Mar 14, 2027 – Oct 21, 2027: -15h

Distance

Seoul and Highlands Ranch are 9,934 km (6,173 miles) apart in a straight line.

More conversions

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Questions and answers

What is the time difference between Seoul and Highlands Ranch?

Highlands Ranch is 15 hours behind Seoul.

What time is it in Highlands Ranch when it is 9 AM in Seoul?

When it is 9:00 AM in Seoul, it is 6:00 PM (Tue, Oct 20) in Highlands Ranch.

When is the best time to call Highlands Ranch 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 Highlands Ranch): working hours on one side, early or late on the other.

Does the time difference between Seoul and Highlands Ranch change?

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