MST to Tehran Time Converter
Mountain Time is on daylight saving time: MDT (UTC−6) until Sun, Nov 1.
Arizona stays on MST (UTC−7).
Start by searching for a time zone, city, or town.
Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
6:00 am06:00 MDT (UTC-6), Oct 14, 2026 = 3:30 pm15:30 IRST (UTC+3:30), Oct 14, 2026
MDT is 9 hours and 30 minutes behind Tehran.
How the time difference changes
For most of the year, MDT is 9 hours and 30 minutes behind Tehran. From Nov 1, 2026 to Mar 14, 2027, MST is 10 hours and 30 minutes behind Tehran.
For most of the year, working hours of 9:00 am to 5:00 pm in MDT correspond to 6:30 pm to 2:30 am (next day) in Tehran. At other times of the year, working hours of 9:00 am to 5:00 pm in MST correspond to 7:30 pm to 3:30 am (next day) in Tehran.For most of the year, working hours of 09:00 to 17:00 in MDT correspond to 18:30 to 02:30 (next day) in Tehran. At other times of the year, working hours of 09:00 to 17:00 in MST correspond to 19:30 to 03:30 (next day) in Tehran.
Compare MST time with Tehran time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Mountain Daylight Time is 9 hours and 30 minutes behind IRST (Iran Standard Time).
6:00 am06:00 in MDT is 3:30 pm15:30 in Tehran, Iran
MDT to Tehran call time
Best time for a conference call or a meeting is between 8am-9am08:00-09:00 in MDT which corresponds to 5:30pm-6:30pm17:30-18:30 in Tehran. Their 9am–5pm09:00–17:00 working hours do not overlap; this is a suggested compromise.
6:00 am06:00 Mountain Daylight Time (MDT). Offset UTC -6:00 hours
3:30 pm15:30 IRST (Iran Standard Time) (Tehran, Iran). Offset UTC +3:30 hours
6:00 am06:00 MDT / 3:30 pm15:30 Tehran, Iran
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.
| MDT | Tehran, Iran |
|---|---|
| 9:30am | |
| 10:30am | |
| 11:30am | |
| 12:30pm | |
| 1:30pm | |
| 2:30pm | |
| 3:30pm | |
| 4:30pm | |
| 5:30pm | |
| 6:30pm | |
| 7:30pm | |
| 8:30pm | |
| 9:30pm | |
| 10:30pm | |
| 11:30pm | |
| 12:30am next day | |
| 1:30am next day | |
| 2:30am next day | |
| 3:30am next day | |
| 4:30am next day | |
| 5:30am next day | |
| 6:30am next day | |
| 7:30am next day | |
| 8:30am next day | |
| 09:30 | |
| 10:30 | |
| 11:30 | |
| 12:30 | |
| 13:30 | |
| 14:30 | |
| 15:30 | |
| 16:30 | |
| 17:30 | |
| 18:30 | |
| 19:30 | |
| 20:30 | |
| 21:30 | |
| 22:30 | |
| 23:30 | |
| 00:30 next day | |
| 01:30 next day | |
| 02:30 next day | |
| 03:30 next day | |
| 04:30 next day | |
| 05:30 next day | |
| 06:30 next day | |
| 07:30 next day | |
| 08:30 next day |
Mountain Standard Time
Offset: MST is 7 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Canada, Mexico, United States
Principal Cities: The largest city in the MST time zone is Phoenix in the United States, with about 1.65 million people. Other major cities in this time zone include Ciudad Juárez, Calgary, Edmonton, Hermosillo.
French: HNR - Heure Normale des Rocheuses
Spanish: MT - Zona Pacífico
Today the lighter areas are on UTC−6 (MDT).
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Mountain Daylight Time (MDT).
End: Mountain Standard Time (MST) ended 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 local daylight time instead. Standard time ends annually on the second Sunday of March.
Start: Mountain Standard Time (MST) starts 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. Standard time starts annually on the first Sunday of November.
MST representations, usage and related time zones
- -07 - basic short
- -0700 - basic
- -07:00 - extended
- -0700 - sign character (-) followed by a four digit time providing hours (07) and minutes (00) of the offset. Indicates an offset of seven hours to the west of the zero meridian.
- Tango - Military abbreviation for MST
- T - short form of 'Tango'
- America/Boise
- America/Cambridge_Bay
- America/Ciudad_Juarez
- America/Creston
- America/Dawson
- America/Dawson_Creek
- America/Denver
- America/Edmonton
- America/Fort_Nelson
- America/Hermosillo
- America/Inuvik
- America/Mazatlan
- America/Phoenix
- America/Shiprock
- America/Whitehorse
- America/Yellowknife
- Canada/Mountain
- Canada/Yukon
- MST
- MST7MDT
- Mexico/BajaSur
- Navajo
- US/Arizona
- US/Mountain
- MST - Mountain Standard Time
- PDT - Pacific Daylight Time
- YST - Yukon Standard Time
- T - Tango Time Zone