What is the time difference between Denver and Seoul?

Seoul is 15 hours ahead of Denver. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Seoul from Denver?

There is no time inside normal working hours in both cities, so someone has to take the call outside them. The nearest workable windows are listed above — pick one and alternate who gets the awkward slot.

Does Denver observe daylight saving time?

Yes. Denver runs on UTC-7 in winter and UTC-6 in summer. The next change is on 2026-11-01, when clocks go back by 60 minutes.

Does Seoul observe daylight saving time?

No. Seoul stays on UTC+9 all year, so its clocks never move.

If it is midday in Denver, what time is it in Seoul?

It is 03:00 in Seoul, and already the following day. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Denver and Seoul use?

Denver uses America/Denver, currently UTC-6 (MDT), and Seoul uses Asia/Seoul, currently UTC+9. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Denver time to Seoul time

Seoul is 15 hours ahead of Denver right now, so midday in Denver lands in the small hours in Seoul.

Convert a time

From

Date

Time

Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

The whole day mapped across: read down the left for Denver, across for Seoul.

Denver	Seoul
00:00	15:00
01:00	16:00
02:00	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
09:00	00:00next day
10:00	01:00next day
11:00	02:00next day
12:00	03:00next day
13:00	04:00next day
14:00	05:00next day
15:00	06:00next day
16:00	07:00next day
17:00	08:00next day
18:00	09:00next day
19:00	10:00next day
20:00	11:00next day
21:00	12:00next day
22:00	13:00next day
23:00	14:00next day

Daylight saving time

Denver changes its clocks; Seoul does not. The difference between them therefore shifts by an hour twice a year.

Denver

Observes daylight saving time

Standard: UTC-7
Daylight: UTC-6
Next change: 2026-11-01 −60m

Seoul

Does not observe daylight saving time

Standard: UTC+9

When you can actually talk

A standard working day in Denver and one in Seoul do not overlap at all. Any call between them is early for one side or late for the other.

Denver 18:00–03:00Seoul 09:00–18:00
Denver 09:00–18:00Seoul 00:00–09:00

Reference

The zone identifiers and offsets behind everything above.

	Denver	Seoul
IANA zone	America/Denver	Asia/Seoul
Abbreviation	MDT	UTC+9
Standard offset	UTC-7	UTC+9
Daylight offset	UTC-6	—
Clock changes this year	2	0
Country	United States	South Korea

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Denver and Seoul?: Seoul is 15 hours ahead of Denver. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Seoul from Denver?: There is no time inside normal working hours in both cities, so someone has to take the call outside them. The nearest workable windows are listed above — pick one and alternate who gets the awkward slot.
Does Denver observe daylight saving time?: Yes. Denver runs on UTC-7 in winter and UTC-6 in summer. The next change is on 2026-11-01, when clocks go back by 60 minutes.
Does Seoul observe daylight saving time?: No. Seoul stays on UTC+9 all year, so its clocks never move.
If it is midday in Denver, what time is it in Seoul?: It is 03:00 in Seoul, and already the following day. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Denver and Seoul use?: Denver uses America/Denver, currently UTC-6 (MDT), and Seoul uses Asia/Seoul, currently UTC+9. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.