ACDT to MDT Converter
Mountain Time is on standard time: MST (UTC−7) until Sun, Mar 14, 2027.
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Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
2:30 am02:30 ACDT (UTC+10:30), Nov 2, 2026 = 9:00 am09:00 MST (UTC-7), Nov 1, 2026
ACDT is 17 hours and 30 minutes ahead of MST.
ACDT and MDT examples
These examples always use ACDT (UTC+10:30) 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.
ACDT is 16 hours and 30 minutes ahead of MDT.
How the time difference changes
Depending on seasonal clock changes, ACST is 15 hours and 30 minutes ahead of MDT, ACDT is 16 hours and 30 minutes ahead of MDT, or ACDT is 17 hours and 30 minutes ahead of MST.
Depending on seasonal clock changes, working hours of 9:00 am to 6:00 pm in ACST correspond to 5:30 pm (previous day) to 2:30 am in MDT, working hours of 9:00 am to 6:00 pm in ACDT correspond to 4:30 pm (previous day) to 1:30 am in MDT, or working hours of 9:00 am to 6:00 pm in ACDT correspond to 3:30 pm (previous day) to 12:30 am in MST.Depending on seasonal clock changes, working hours of 09:00 to 18:00 in ACST correspond to 17:30 (previous day) to 02:30 in MDT, working hours of 09:00 to 18:00 in ACDT correspond to 16:30 (previous day) to 01:30 in MDT, or working hours of 09:00 to 18:00 in ACDT correspond to 15:30 (previous day) to 00:30 in MST.
Compare ACDT time with MDT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Australian Central Daylight Time is 17 hours and 30 minutes ahead of Mountain Standard Time.
2:30 am02:30 in ACDT is 9:00 am09:00 in MST
ACDT to MST call time
Best time for a conference call or a meeting is between 9am-11:30am09:00-11:30 in ACDT which corresponds to 3:30pm-6pm15:30-18:00 in MST (previous day)
2:30 am02:30 Australian Central Daylight Time (ACDT). Offset UTC +10:30 hours
9:00 am09:00 Mountain Standard Time (MST). Offset UTC -7:00 hours
2:30 am02:30 ACDT / 9:00 am09:00 MST
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
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Australian Central Daylight Time
Offset: ACDT is 10 hours and 30 minutes ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Australia
Principal Cities: The largest city in the ACDT time zone is Adelaide in Australia, with about 1.469 million people. Other major cities in this time zone include Mount Gambier, Mount Barker, Whyalla, Gawler.
Today all shaded areas are on ACDT.
Daylight Saving: Australian Central Daylight Time (ACDT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Australian Central Standard Time (ACST).
Start: Australian Central Daylight Time (ACDT) started on Sunday, October 4, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, October 4, 2026, 3:00 am03:00. Daylight saving starts annually on the first Sunday of October.
End: Australian Central Daylight Time (ACDT) ends on Sunday, April 4, 2027 at 3:00 am03:00 local time and clocks are set one hour back to Sunday, April 4, 2027, 2:00 am02:00 local standard time instead. Daylight saving ends annually on the first Sunday of April.
See Australia daylight saving time and upcoming clock changes worldwide.
ACDT representations, usage and related time zones
- +1030 - basic
- +10:30 - extended
- +1030 - sign character (+) followed by a four digit time providing hours (10) and minutes (30) of the offset. Indicates an offset of ten hours and thirty minutes to the east of the zero meridian.
- Australia/Adelaide
- Australia/Broken_Hill
- Australia/South
- Australia/Yancowinna
- ACDT - Australian Central Daylight Time
- LHST - Lord Howe Standard 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