KST to MDT Converter & Meeting Planner
Quick answer: 9:00 AM KST = 6:00 PM MDT (fixed +09:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Korea Standard Time (KST) and Mountain Daylight Time (MDT)? You need to account for the standard time difference. Mountain Daylight Time is normally 15 hours behind Korea Standard Time. Whether you are coordinating between teams in Seoul and Busan and Denver and Salt Lake City, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM KST = 9:00 AM MDT. The full 24-hour KST to MDT table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM KST = 12:00 AM MDT.
| KST Time | MDT Time |
|---|---|
| 12:00 AM (00:00) | 9:00 AM (09:00)-1 day |
| 1:00 AM (01:00) | 10:00 AM (10:00)-1 day |
| 2:00 AM (02:00) | 11:00 AM (11:00)-1 day |
| 3:00 AM (03:00) | 12:00 PM (12:00)-1 day |
| 4:00 AM (04:00) | 1:00 PM (13:00)-1 day |
| 5:00 AM (05:00) | 2:00 PM (14:00)-1 day |
| 6:00 AM (06:00) | 3:00 PM (15:00)-1 day |
| 7:00 AM (07:00) | 4:00 PM (16:00)-1 day |
| 8:00 AM (08:00) | 5:00 PM (17:00)-1 day |
| 9:00 AM (09:00) | 6:00 PM (18:00)-1 day |
| 10:00 AM (10:00) | 7:00 PM (19:00)-1 day |
| 11:00 AM (11:00) | 8:00 PM (20:00)-1 day |
| 12:00 PM (12:00) | 9:00 PM (21:00)-1 day |
| 1:00 PM (13:00) | 10:00 PM (22:00)-1 day |
| 2:00 PM (14:00) | 11:00 PM (23:00)-1 day |
| 3:00 PM (15:00) | 12:00 AM (00:00) |
| 4:00 PM (16:00) | 1:00 AM (01:00) |
| 5:00 PM (17:00) | 2:00 AM (02:00) |
| 6:00 PM (18:00) | 3:00 AM (03:00) |
| 7:00 PM (19:00) | 4:00 AM (04:00) |
| 8:00 PM (20:00) | 5:00 AM (05:00) |
| 9:00 PM (21:00) | 6:00 AM (06:00) |
| 10:00 PM (22:00) | 7:00 AM (07:00) |
| 11:00 PM (23:00) | 8:00 AM (08:00) |
Best time to call Denver from Seoul
For most work calls, compare the normal business day in Seoul (KST) with the business day in Denver (MDT). KST commonly covers East Asia, while MDT is mainly associated with North America.
⚠️ Note: 2026-07-04 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
⚠️ There is no clean same-day business-hours overlap on 2026-07-04. A practical compromise is around 12:00 AM KST, which reaches 9:00 AM MDT near the start of their workday.
- DST Safety: KST or MDT may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Korea Exchange (KRX): 09:00-15:30 local time in Seoul.
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Frequently Asked Questions
What is the time difference between KST and MDT?
During standard time, Mountain Daylight Time is 15 hours behind Korea Standard Time.
Does South Korea observe Daylight Saving Time?
South Korea does not observe Daylight Saving Time and has not done so since 1988, when DST was discontinued following the Seoul Summer Olympics. KST remains fixed at UTC+9:00 every day of the year, meaning the offset between Seoul and any DST-observing country shifts by one hour twice annually when those countries change their clocks.
Are KST and JST the same?
Yes, Korea Standard Time (KST) and Japan Standard Time (JST) share the identical UTC+9:00 offset, and neither country observes Daylight Saving Time. Seoul and Tokyo run on exactly the same clock year-round, which directly supports the deep semiconductor, automotive, and consumer electronics supply chain integration between the two economies.
When does MDT start and end?
MDT begins on the second Sunday in March at 02:00 local MST time, when clocks spring forward one hour from MST (UTC-7) to MDT (UTC-6). It ends on the first Sunday in November at 02:00 local MDT time, when clocks fall back to MST. In 2026, MDT runs from March 8 through November 1, covering the majority of the calendar year.
Is Arizona on MDT?
Most of Arizona — including Phoenix and Tucson — does not observe Daylight Saving Time and remains on MST (UTC-7) year-round under a state law in effect since 1968, meaning Arizona does not advance to MDT each March. The significant exception is the Navajo Nation, a sovereign territory spanning parts of northeastern Arizona, southeastern Utah, and northwestern New Mexico, which does observe DST and shifts to MDT on the standard federal schedule.