KST to MDT Converter
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Quick answers
Selected conversion
9:00 pm21:00 KST (UTC+9), Nov 7, 2026 = 5:00 am05:00 MST (UTC-7), Nov 7, 2026
KST is 16 hours ahead of MST.
KST and MDT examples
These examples always use KST (UTC+9) and MDT (UTC-6). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
KST is 15 hours ahead of MDT.
How the time difference changes
For most of the year, KST is 15 hours ahead of MDT. From Nov 1, 2026 to Mar 14, 2027, and from Nov 7, 2027 to Mar 12, 2028, KST is 16 hours ahead of MST.
For most of the year, working hours of 9:00 am to 6:00 pm in KST correspond to 6:00 pm (previous day) to 3:00 am in MDT. At other times of the year, working hours of 9:00 am to 6:00 pm in KST correspond to 5:00 pm (previous day) to 2:00 am in MST.For most of the year, working hours of 09:00 to 18:00 in KST correspond to 18:00 (previous day) to 03:00 in MDT. At other times of the year, working hours of 09:00 to 18:00 in KST correspond to 17:00 (previous day) to 02:00 in MST.
Compare KST time with MDT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Korea Standard Time is 16 hours ahead of Mountain Standard Time.
9:00 pm21:00 in KST is 5:00 am05:00 in MST
KST to MST call time
Best time for a conference call or a meeting is between 9am-10am09:00-10:00 in KST which corresponds to 5pm-6pm17:00-18:00 in MST (previous day)
9:00 pm21:00 Korea Standard Time (KST). Offset UTC +9:00 hours
5:00 am05:00 Mountain Standard Time (MST). Offset UTC -7:00 hours
9:00 pm21:00 KST / 5:00 am05:00 MST
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| KST | MST |
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Korea Standard Time
Offset: KST is 9 hours ahead of Greenwich Mean Time (GMT).
Countries using this time zone: North Korea, South Korea
Principal Cities: The largest city in the KST time zone is Seoul in South Korea, with about 10.349 million people. Other major cities in this time zone include Busan, Pyongyang, Incheon, Daegu.
Daylight Saving: Clocks in Korea Standard Time (KST) do not change for daylight saving time, so KST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
KST representations, usage and related time zones
- +09 - basic short
- +0900 - basic
- +09:00 - extended
- +0900 - sign character (+) followed by a four digit time providing hours (09) and minutes (00) of the offset. Indicates an offset of nine hours to the east of the zero meridian.
- India - Military abbreviation for KST
- I - short form of 'India'
- Asia/Pyongyang
- Asia/Seoul
- ROK
- Korea Standard Time - UTC +9
- Pyongyang Time - UTC +8:30
- AWDT - Australian Western Daylight Time
- CHOST - Choibalsan Summer Time
- I - India Time Zone
- IRKST - Irkutsk Summer Time
- JST - Japan Standard Time
- KST - Korea Standard Time
- PWT - Palau Time
- TLT - East Timor Time
- ULAST - Ulaanbaatar Summer Time
- WIT - Eastern Indonesian Time
- YAKT - Yakutsk Time
Mountain Daylight Time
Offset: MDT is 6 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Canada, Mexico, United States
Principal Cities: The largest city in the MDT time zone is Ciudad Juárez in Mexico, with about 1.512 million people. Other major cities in this time zone include Denver, El Paso, Albuquerque, Colorado Springs.
French: HAR - Heure Avancée des Rocheuses
Spanish: MT - Zona Pacífico
Today the shaded areas are on UTC−7 (MST).
Daylight Saving: Mountain Daylight Time (MDT) is a daylight saving/summer time zone, but some places set clocks back one hour during winter and observe Mountain Standard Time (MST).
End: Mountain Daylight Time (MDT) ended on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks were set one hour back to Sunday, November 1, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the first Sunday of November.
Start: Mountain Daylight Time (MDT) starts on Sunday, March 14, 2027 at 2:00 am02:00 local time and clocks are set one hour forward to Sunday, March 14, 2027, 3:00 am03:00. Daylight saving starts annually on the second Sunday of March.
See USA daylight saving time and upcoming clock changes worldwide.
MDT representations, usage and related time zones
- -06 - basic short
- -0600 - basic
- -06:00 - extended
- -0600 - sign character (-) followed by a four digit time providing hours (06) and minutes (00) of the offset. Indicates an offset of six hours to the west of the zero meridian.
- Sierra - Military abbreviation for MDT
- S - short form of 'Sierra'
- America/Boise
- America/Cambridge_Bay
- America/Ciudad_Juarez
- America/Denver
- America/Edmonton
- America/Inuvik
- America/Shiprock
- America/Yellowknife
- Canada/Mountain
- MST7MDT
- Navajo
- US/Mountain
- CST - Central Standard Time
- CT - Central Time
- MDT - Mountain Daylight Time
- EAST - Easter Island Standard Time
- GALT - Galapagos Time
- S - Sierra Time Zone