MST to Tehran Time Converter
IRST is 10 hours 30 minutes ahead of MST. 9:00 AM MST = 7:30 PM IRST.
IRST is 10 hours 30 minutes ahead of MST at the moment. To convert MST to Tehran Time, add 10 hours 30 minutes to the MST time: 9:00 AM MST = 7:30 PM IRST.
MST (Mountain Time) is used in Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year. Tehran Time (Tehran time) is used in Tehran, Iran.
Most of Arizona uses MST all year and does not switch to MDT.
MST to Tehran Time time conversion table
MST to Tehran Time on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| MST | Tehran Time | Day |
|---|---|---|
| 12:00 AM MST | 10:30 AM IRST | — |
| 1:00 AM MST | 11:30 AM IRST | — |
| 2:00 AM MST | 12:30 PM IRST | — |
| 3:00 AM MST | 1:30 PM IRST | — |
| 4:00 AM MST | 2:30 PM IRST | — |
| 5:00 AM MST | 3:30 PM IRST | — |
| 6:00 AM MST | 4:30 PM IRST | — |
| 7:00 AM MST | 5:30 PM IRST | — |
| 8:00 AM MST | 6:30 PM IRST | — |
| 9:00 AM MST | 7:30 PM IRST | — |
| 10:00 AM MST | 8:30 PM IRST | — |
| 11:00 AM MST | 9:30 PM IRST | — |
| 12:00 PM MST | 10:30 PM IRST | night |
| 1:00 PM MST | 11:30 PM IRST | night |
| 2:00 PM MST | 12:30 AM IRST | next day |
| 3:00 PM MST | 1:30 AM IRST | next day |
| 4:00 PM MST | 2:30 AM IRST | next day |
| 5:00 PM MST | 3:30 AM IRST | next day |
| 6:00 PM MST | 4:30 AM IRST | next day |
| 7:00 PM MST | 5:30 AM IRST | next day |
| 8:00 PM MST | 6:30 AM IRST | next day |
| 9:00 PM MST | 7:30 AM IRST | next day |
| 10:00 PM MST | 8:30 AM IRST | next day |
| 11:00 PM MST | 9:30 AM IRST | next day |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert MST to Tehran Time
Add 10 hours 30 minutes to the MST time to get Tehran Time.
Example: 9:00 AM MST = 7:30 PM IRST.
Across midnight: 10:00 PM MST = 8:30 AM IRST (next day). The date changes, so always check the day as well as the hour.
Time difference between MST and Tehran Time
The time difference between MST and Tehran Time 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:
- 31 Dec 2025 – 7 Mar 2026: Tehran Time is 10 hours 30 minutes ahead of MST.
- 8 Mar 2026 – 31 Oct 2026: Tehran Time is 9 hours 30 minutes ahead of MST.
- 1 Nov 2026 – 30 Dec 2026: Tehran Time is 10 hours 30 minutes ahead of MST.
MST and Tehran Time during daylight saving time
- 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).
- Tehran Time does not observe daylight saving time; it stays on UTC+3:30 all year.
Best time for a meeting between MST and Tehran Time
MST and Tehran Time have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM MST, which is 5:30 PM IRST.
MST to Tehran Time FAQ
What is the time difference between MST and Tehran Time?
Right now IRST is 10 hours 30 minutes ahead of MST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM MST in Tehran Time?
9:00 AM MST is 7:30 PM IRST.
What is 12 PM (noon) MST in Tehran Time?
12:00 PM MST is 10:30 PM IRST.
Is Tehran Time ahead of or behind MST?
IRST is 10 hours 30 minutes ahead of MST, so it is later in Tehran Time than in MST.
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.
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.
What is the best time for a meeting between MST and Tehran Time?
MST and Tehran Time have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM MST, which is 5:30 PM IRST.
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 Tehran Time to MST
Convert MST to other time zones
Convert other time zones to Tehran Time
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.