MeanwhileMST to IRST converter
Mountain Time (Denver, Salt Lake City, Calgary) to Iran Time (Tehran).
IRST is 9 h 30 min ahead of MST.
9:00 AM MST = 6:30 PM IRST same day
Best time to meet
No hour falls inside 9 AM to 5 PM in both places. The least painful: around 7:00 AM MST, which is 4:30 PM IRST.
MST to IRST time table
For 30 Oct 2026. Green rows: both sides between 9 AM and 5 PM.
| MST | IRST |
|---|---|
| 12:00 AM MST | 9:30 AM IRST |
| 1:00 AM MST | 10:30 AM IRST |
| 2:00 AM MST | 11:30 AM IRST |
| 3:00 AM MST | 12:30 PM IRST |
| 4:00 AM MST | 1:30 PM IRST |
| 5:00 AM MST | 2:30 PM IRST |
| 6:00 AM MST | 3:30 PM IRST |
| 7:00 AM MST | 4:30 PM IRST |
| 8:00 AM MST | 5:30 PM IRST |
| 9:00 AM MST | 6:30 PM IRST |
| 10:00 AM MST | 7:30 PM IRST |
| 11:00 AM MST | 8:30 PM IRST |
| 12:00 PM MST | 9:30 PM IRST |
| 1:00 PM MST | 10:30 PM IRST |
| 2:00 PM MST | 11:30 PM IRST |
| 3:00 PM MST | 12:30 AM IRST next day |
| 4:00 PM MST | 1:30 AM IRST next day |
| 5:00 PM MST | 2:30 AM IRST next day |
| 6:00 PM MST | 3:30 AM IRST next day |
| 7:00 PM MST | 4:30 AM IRST next day |
| 8:00 PM MST | 5:30 AM IRST next day |
| 9:00 PM MST | 6:30 AM IRST next day |
| 10:00 PM MST | 7:30 AM IRST next day |
| 11:00 PM MST | 8:30 AM IRST next day |
Quick answers
- 9:00 AM MST = 6:30 PM IRST
- 12:00 PM MST = 9:30 PM IRST
- 3:00 PM MST = 12:30 AM IRST (next day)
- 5:00 PM MST = 2:30 AM IRST (next day)
- 9:00 AM IRST = 11:30 PM MST (previous day)
- 12:00 PM IRST = 2:30 AM MST
- 5:00 PM IRST = 7:30 AM MST
Does the gap change during the year?
Yes, because of daylight saving. Until 1 Nov 2026: IRST is 9 h 30 min ahead of MST. From 1 Nov 2026 to 14 Mar 2027: IRST is 10 h 30 min ahead of MST. From 14 Mar 2027 to 7 Nov 2027: IRST is 9 h 30 min ahead of MST.
MST next changes its clocks on 1 Nov 2026 (back 1 h, to UTC−7), then on 14 Mar 2027 (forward 1 h, to UTC−6). IRST does not change its clocks.
About MST and IRST
MST here means Mountain Time, the clock in Denver, Salt Lake City, Calgary. Right now it is UTC−6. Strictly, MST is the winter name; in summer these places use MDT. This page follows their real clock all year.
IRST here means Iran Time, the clock in Tehran. Right now it is UTC+3:30. It has no daylight saving.
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