MDT to JST Converter
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Quick answers
Selected conversion
6:00 am06:00 MDT (UTC-6), Oct 18, 2026 = 9:00 pm21:00 JST (UTC+9), Oct 18, 2026
MDT is 15 hours behind JST.
MDT and JST examples
These examples always use MDT (UTC-6) and JST (UTC+9). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
MDT is 15 hours behind JST.
How the time difference changes
For most of the year, MDT is 15 hours behind JST. From Nov 1, 2026 to Mar 14, 2027, MST is 16 hours behind JST.
For most of the year, working hours of 9:00 am to 6:00 pm in MDT correspond to 12:00 am (next day) to 9:00 am (next day) in JST. At other times of the year, working hours of 9:00 am to 6:00 pm in MST correspond to 1:00 am (next day) to 10:00 am (next day) in JST.For most of the year, working hours of 09:00 to 18:00 in MDT correspond to 00:00 (next day) to 09:00 (next day) in JST. At other times of the year, working hours of 09:00 to 18:00 in MST correspond to 01:00 (next day) to 10:00 (next day) in JST.
Compare MDT time with JST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Mountain Daylight Time is 15 hours behind Japan Standard Time.
6:00 am06:00 in MDT is 9:00 pm21:00 in JST
MDT to JST call time
Best time for a conference call or a meeting is between 5:30pm-6:30pm17:30-18:30 in MDT which corresponds to 8:30am-9:30am08:30-09:30 in JST (next day). Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.
6:00 am06:00 Mountain Daylight Time (MDT). Offset UTC -6:00 hours
9:00 pm21:00 Japan Standard Time (JST). Offset UTC +9:00 hours
6:00 am06:00 MDT / 9:00 pm21:00 JST
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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 all shaded areas are on MDT.
Daylight Saving: Mountain Daylight Time (MDT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Mountain Standard Time (MST).
Start: Mountain Daylight Time (MDT) started on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00. Daylight saving starts annually on the second Sunday of March.
End: Mountain Daylight Time (MDT) ends on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are 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.
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
Japan Standard Time
Offset: JST is 9 hours ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Japan
Principal Cities: The largest city in the JST time zone is Tokyo in Japan, with about 9.733 million people. Other major cities in this time zone include Yokohama, Osaka, Nagoya, Sapporo.
Daylight Saving: Clocks in Japan Standard Time (JST) do not change for daylight saving time, so JST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
Current time in Japan: Japan time now
JST 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 JST
- I - short form of 'India'
- Asia/Tokyo
- Japan
- 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