Korea Standard Time to Mountain Standard Time, with the offset for today's date rather than an average.
MST time
Mountain Standard Time is behind Korea Standard Time — noon in KST is 9:00 pm in MDT
KST todayUTC+09:00
MDT todayUTC-06:00
Working-hour overlap0 h
Common meeting hours converted from KST to MST
KST (Korea Standard Time)
MST (Mountain Standard Time)
Working hours in both?
7:00 am
4:00 pmprevious day
No
8:00 am
5:00 pmprevious day
No
9:00 am
6:00 pmprevious day
No
10:00 am
7:00 pmprevious day
No
11:00 am
8:00 pmprevious day
No
12:00 pm
9:00 pmprevious day
No
1:00 pm
10:00 pmprevious day
No
2:00 pm
11:00 pmprevious day
No
3:00 pm
12:00 am
No
4:00 pm
1:00 am
No
5:00 pm
2:00 am
No
6:00 pm
3:00 am
No
7:00 pm
4:00 am
No
8:00 pm
5:00 am
No
This calculator needs JavaScript to recalculate. Without it you are
reading the answer worked out on 28 August 2026, which is exact for that date and does not
change by itself. With JavaScript on, the page works the answer out again for the date you
open it.
Worked out for
· conventions last checked
Which zone this page means. South Korea does not observe daylight saving, so KST applies all year. It shares an offset with Japan. MST is standard time only; MDT (UTC-6) applies from March to November. Arizona stays on MST all year.
KST is ahead of MST by 15 hours today
On 28 August 2026, Korea Standard Time is on KST at
UTC+09:00 and Mountain Standard Time is on MDT at
UTC-06:00. The gap between them is 15 hours, with MST behind. So 9:00 am in KST is
6:00 pm in MST, and 5:00 pm in KST is
2:00 am in MST. Going the other way, see MST to KST.
The gap is not constant, and that is the part that catches people out
Mountain Standard Time is currently observing daylight saving and changes next on 1 November 2026. Korea Standard Time does not observe daylight saving, so the gap moves only when Mountain Standard Time changes
its clocks — twice a year, by one hour.
When you can actually both be at work
Taking a working day as 9:00 am to 5:00 pm local at each end, there
are0 overlapping hours
in a normal day. There is none: the two working days do not touch at all, so any live meeting between Korea Standard Time and Mountain Standard Time has to sit outside somebody's normal hours. The table above shows which end has the shorter stretch to give up.
Zone rules are set by legislation and change, sometimes at short notice. This page is
built against tzdata 2026a, last reviewed
2026-08-18. Quarterly. Zone rules change by legislation, sometimes at short notice. Version and review date are shown on every zone page. The converter above reads
your browser's own copy of the zone database, so if a rule has changed since this page was built the
live answer follows the new rule — and so does everything above, which is worked out from the same
database when you open the page.
Every convention used above — whether the start date counts, how month ends are
clamped, which holidays close an office — is written out on the
methodology page, including the daylight-saving rules behind the 15-hour gap above.
The current offset is shown at the top of this page. It is computed for today's date rather than quoted as an average, because the two regions change their clocks on different dates and the gap is different for a few weeks each year.
Is KST the same as Korea Standard Time all year?
Not necessarily. Standard time and summer time are separate zones with separate abbreviations, so much of the year the technically correct abbreviation is the daylight one. The page states which is in force on today's date.
When do the clocks change in these zones?
The next change date for each zone is shown in the result panel, along with what the offset becomes afterwards.
What is a good meeting time between KST and MST?
The business-hours overlap window is shown below the converter. Where there is no overlap the page says so rather than suggesting an impossible time.
This page could not bring itself up to date in your
browser, so the dates above are the ones worked out on 28 August 2026. They are exact for
that date and do not change by themselves. Enter your own dates in the calculator above for an
answer worked out now.