No overlap — one side will join outside working hours
KST (Seoul)
MDT (Denver)
00:00
09:00-1dWorking
01:00
10:00-1dWorking
02:00
11:00-1dWorking
03:00
12:00-1dWorking
04:00
13:00-1dWorking
05:00
14:00-1dWorking
06:00
15:00-1dWorking
07:00
16:00-1dWorking
08:00
17:00-1d
09:00Working
18:00-1doff
10:00Working
19:00-1doff
11:00Working
20:00-1doff
12:00Working
21:00-1doff
13:00Working
22:00-1doff
14:00Working
23:00-1doff
15:00Working
00:00off
16:00Working
01:00off
17:00
02:00
18:00
03:00
19:00
04:00
20:00
05:00
21:00
06:00
22:00
07:00
23:00
08:00
Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between kst and mdt?
Korea Standard Time (kst) is UTC+9 and Mountain Daylight Time (mdt) is UTC-6. The difference between them is 15 hours.
Where is kst used?
Korea Standard Time (kst) is used in South Korea and surrounding regions. The IANA timezone identifier is Asia/Seoul.
Where is mdt used?
Mountain Daylight Time (mdt) is used in USA and surrounding regions. The IANA timezone identifier is America/Denver.
How do I convert kst to mdt?
Use the interactive converter above. Drag the time slider to any kst time and the mdt equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
KST (Seoul) is 15 hours ahead of MDT (Denver). At noon in KST (Seoul), your contact in MDT (Denver) sees 21:00.
KST (Seoul) observes Asia/Seoul and MDT (Denver) observes America/Denver — a 15 hours gap between them.
Business hours comparison
When KST (Seoul) is in standard working hours, MDT (Denver) is not — and vice versa. There is no mutual business window between these two locations.
Meeting time recommendations
No business hours overlap exists between KST (Seoul) and MDT (Denver). Showing the most balanced options with minimal inconvenience for both locations.
07:00 Seoul / 16:00 Denver⚡ One side off-hours
⚠️ 2h before working hours in Seoul
09:00 Seoul / 18:00 Denver⚡ One side off-hours
⚠️ 2h after working hours in Denver
06:00 Seoul / 15:00 Denver⚡ One side off-hours
⚠️ 3h before working hours in Seoul
Assumes a standard 9 AM–5 PM workday in each location's local timezone.
Public holidays for both locations
⚡ Holiday alerts for both locations, double-check schedules before confirming.
KST (Seoul)7 holidays
Aug 15Liberation Day
Sep 24Chuseok
Sep 25Chuseok
Sep 26Chuseok
Oct 3National Foundation Day
MDT (Denver)8 holidays
Jun 19Juneteenth National Independence DaySOON
Jul 3Independence Day
Sep 7Labour Day
Oct 12Columbus Day
Oct 12Indigenous Peoples' Day
Scheduling between KST (Seoul) and MDT (Denver)
Teams in KST (Seoul) (South Korea) and MDT (Denver) (USA) deal with a 15-hour gap that pushes their working days apart. Real-time meetings always require someone to stretch outside the standard 9–5.
💡 Scheduling tips for these locations
⚡
07:00–08:00 in KST (Seoul) corresponds to 16:00–17:00 in MDT (Denver) (2h before working hours in Seoul).
⚡
09:00–10:00 in KST (Seoul) corresponds to 18:00–19:00 in MDT (Denver) (2h after working hours in Denver).
⚡
06:00–07:00 in KST (Seoul) corresponds to 15:00–16:00 in MDT (Denver) (3h before working hours in Seoul).
With no shared business hours, these slots distribute the scheduling burden as evenly as possible between both locations.
Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.
Drag the slider at the top to convert any KST (Seoul) time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.
