Tehran Time to MST Converter
MST is 10 hours 30 minutes behind IRST. 9:00 AM IRST = 10:30 PM MST (previous day).
MST is 10 hours 30 minutes behind IRST at the moment. To convert Tehran Time to MST, subtract 10 hours 30 minutes from the Tehran Time time: 9:00 AM IRST = 10:30 PM MST (previous day).
Tehran Time (Tehran time) is used in Tehran, Iran. MST (Mountain Time) is used in Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year.
Most of Arizona uses MST all year and does not switch to MDT.
Tehran Time to MST time conversion table
Tehran Time to MST on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| Tehran Time | MST | Day |
|---|---|---|
| 12:00 AM IRST | 1:30 PM MST | previous day |
| 1:00 AM IRST | 2:30 PM MST | previous day |
| 2:00 AM IRST | 3:30 PM MST | previous day |
| 3:00 AM IRST | 4:30 PM MST | previous day |
| 4:00 AM IRST | 5:30 PM MST | previous day |
| 5:00 AM IRST | 6:30 PM MST | previous day |
| 6:00 AM IRST | 7:30 PM MST | previous day |
| 7:00 AM IRST | 8:30 PM MST | previous day |
| 8:00 AM IRST | 9:30 PM MST | previous day |
| 9:00 AM IRST | 10:30 PM MST | previous day |
| 10:00 AM IRST | 11:30 PM MST | previous day |
| 11:00 AM IRST | 12:30 AM MST | night |
| 12:00 PM IRST | 1:30 AM MST | night |
| 1:00 PM IRST | 2:30 AM MST | night |
| 2:00 PM IRST | 3:30 AM MST | night |
| 3:00 PM IRST | 4:30 AM MST | night |
| 4:00 PM IRST | 5:30 AM MST | night |
| 5:00 PM IRST | 6:30 AM MST | — |
| 6:00 PM IRST | 7:30 AM MST | — |
| 7:00 PM IRST | 8:30 AM MST | — |
| 8:00 PM IRST | 9:30 AM MST | — |
| 9:00 PM IRST | 10:30 AM MST | — |
| 10:00 PM IRST | 11:30 AM MST | — |
| 11:00 PM IRST | 12:30 PM MST | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert Tehran Time to MST
Subtract 10 hours 30 minutes from the Tehran Time time to get MST.
Example: 9:00 AM IRST = 10:30 PM MST (previous day).
Across midnight: 1:00 AM IRST = 2:30 PM MST (previous day). The date changes, so always check the day as well as the hour.
Time difference between Tehran Time and MST
The time difference between Tehran Time and MST is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:
- 1 Jan 2026 – 7 Mar 2026: MST is 10 hours 30 minutes behind of Tehran Time.
- 8 Mar 2026 – 31 Oct 2026: MST is 9 hours 30 minutes behind of Tehran Time.
- 1 Nov 2026 – 31 Dec 2026: MST is 10 hours 30 minutes behind of Tehran Time.
Tehran Time and MST during daylight saving time
- Tehran Time does not observe daylight saving time; it stays on UTC+3:30 all year.
- MST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from MST (UTC−7) to MDT (UTC−6).
Best time for a meeting between Tehran Time and MST
Tehran Time and MST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM IRST, which is 8:30 PM MST.
Tehran Time to MST FAQ
What is the time difference between Tehran Time and MST?
Right now MST is 10 hours 30 minutes behind IRST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM Tehran Time in MST?
9:00 AM IRST is 10:30 PM MST (previous day).
What is 12 PM (noon) Tehran Time in MST?
12:00 PM IRST is 1:30 AM MST.
Is MST ahead of or behind Tehran Time?
MST is 10 hours 30 minutes behind IRST, so it is earlier in MST than in Tehran Time.
Does Tehran Time change for daylight saving time?
No. Tehran Time stays on the same offset all year, so conversions never shift for daylight saving time.
Does MST change for daylight saving time?
Yes. MST next changes on 14 Mar 2027, when clocks go forward one hour from MST to MDT.
What is the best time for a meeting between Tehran Time and MST?
Tehran Time and MST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM IRST, which is 8:30 PM MST.
Is MT the same as MST?
MST is the winter (standard) name of Mountain Time (MT). From March to November the same clocks are called MDT. This converter always uses the one in force on the date you choose.
Related conversions
Convert MST to Tehran Time
Convert Tehran Time to other time zones
Convert other time zones to MST
Learn more
Updated 7 November 2026. Time zone data: IANA tz database.