MST to KST Converter & Meeting Planner
Quick answer: 9:00 AM MST = 1:00 AM KST (fixed -07:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Mountain Standard Time (MST) and Korea Standard Time (KST)? You need to account for the standard time difference. Korea Standard Time is normally 16 hours ahead of Mountain Standard Time. Whether you are coordinating between teams in Denver and Phoenix and Seoul and Busan, 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 MST = 4:00 PM KST. The full 24-hour MST to KST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM MST = 7:00 AM KST (+1 day).
| MST Time | KST Time |
|---|---|
| 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) | 12:00 AM (00:00)+1 day |
| 9:00 AM (09:00) | 1:00 AM (01:00)+1 day |
| 10:00 AM (10:00) | 2:00 AM (02:00)+1 day |
| 11:00 AM (11:00) | 3:00 AM (03:00)+1 day |
| 12:00 PM (12:00) | 4:00 AM (04:00)+1 day |
| 1:00 PM (13:00) | 5:00 AM (05:00)+1 day |
| 2:00 PM (14:00) | 6:00 AM (06:00)+1 day |
| 3:00 PM (15:00) | 7:00 AM (07:00)+1 day |
| 4:00 PM (16:00) | 8:00 AM (08:00)+1 day |
| 5:00 PM (17:00) | 9:00 AM (09:00)+1 day |
| 6:00 PM (18:00) | 10:00 AM (10:00)+1 day |
| 7:00 PM (19:00) | 11:00 AM (11:00)+1 day |
| 8:00 PM (20:00) | 12:00 PM (12:00)+1 day |
| 9:00 PM (21:00) | 1:00 PM (13:00)+1 day |
| 10:00 PM (22:00) | 2:00 PM (14:00)+1 day |
| 11:00 PM (23:00) | 3:00 PM (15:00)+1 day |
Best time to call Seoul from Denver
For most work calls, compare the normal business day in Denver (MST) with the business day in Seoul (KST). MST commonly covers North America, while KST is mainly associated with East Asia.
⚠️ Note: 2026-07-05 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 2026-07-05. A practical compromise is around 6:00 PM MST, which reaches 9:00 AM KST near the start of their workday.
- DST Safety: MST or KST 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 MST and KST?
During standard time, Korea Standard Time is 16 hours ahead of Mountain Standard Time.
Does Arizona observe Daylight Saving Time?
Most of Arizona — including Phoenix, Tucson, and the state government — does not observe Daylight Saving Time, remaining on MST (UTC-7) year-round under a state law in effect since 1968. The significant exception is the Navajo Nation, which spans parts of northeastern Arizona, Utah, and New Mexico and does observe DST, creating one of the most complex intrastate time zone situations in the United States.
What is the difference between MST and MDT?
MST (Mountain Standard Time) is the winter offset at UTC-7:00, observed from the first Sunday in November through the second Sunday in March. MDT (Mountain Daylight Time) is the summer offset at UTC-6:00, applied when most Mountain Time regions advance their clocks by one hour during Daylight Saving 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.