IRST to MDT Time Converter
Use this IRST to MDT time converter to compare Iran and US Mountain time instantly. MDT is 9 hours and 30 minutes behind IRST, so 9:00 AM IRST becomes 11:30 PM (previous day) MDT and 5:00 PM IRST becomes 7:30 AM MDT. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.
IRST to MDT Quick Facts
Use this IRST to MDT converter to compare Iran and US Mountain time, check the 9 hours and 30 minutes gap, and confirm the right slot for calls, handoffs, and deadlines. Find the best overlap for calls and meetings.
How to Convert IRST to MDT
Converting between Iran Standard Time and Mountain Daylight Time means accounting for a 9 hours and 30 minutes gap — here's how to do it in under 10 seconds with no sign-up.
Pick the date and time in Iran Standard Time (UTC +3:30) that you want to convert. Hit "Now" to load the current IRST time instantly, or use "+1h" to step forward and compare.
The equivalent Mountain Daylight Time (UTC -6) time appears immediately. Since MDT is 9 hours and 30 minutes behind of IRST, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the MDT result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — useful when Daylight Saving Time changes the gap.
Why Choose Our IRST to MDT Converter
With 9 hours and 30 minutes between IRST and MDT, business-hours overlap is limited. This tool instantly shows which hours work on both sides, so you can lock in a meeting without a chain of "does 3 PM work for you?" emails.
Late-night IRST times can land on a different date in MDT because of the 9 hours and 30 minutes offset. The converter labels "next day" or "previous day" next to the result so you never send a message a day early or miss a deadline.
The half-hour offset between IRST (UTC +3:30) and MDT (UTC -6) already makes mental math tricky — add Daylight Saving Time and the gap can shift further. This converter uses live UTC offsets, so you're always accurate.
Product launches, sports matches, and webinars are often announced in IRST. Convert the event time to MDT so you know exactly when to tune in — with a 9 hours and 30 minutes difference, a morning event in Iran hits the evening in United States.
IRST to MDT Time Conversion Chart
Quick-reference conversion table covering every hour of the day at a glance.
Iran Standard Time to Mountain Daylight Time full day schedule
| Iran Standard Time | Mountain Daylight Time |
|---|---|
| 12:00 AM |
2:30 PM
(previous day)
|
| 1:00 AM |
3:30 PM
(previous day)
|
| 2:00 AM |
4:30 PM
(previous day)
|
| 3:00 AM |
5:30 PM
(previous day)
|
| 4:00 AM |
6:30 PM
(previous day)
|
| 5:00 AM |
7:30 PM
(previous day)
|
| 6:00 AM |
8:30 PM
(previous day)
|
| 7:00 AM |
9:30 PM
(previous day)
|
| 8:00 AM |
10:30 PM
(previous day)
|
| 9:00 AM |
11:30 PM
(previous day)
|
| 10:00 AM |
12:30 AM
|
| 11:00 AM |
1:30 AM
|
| 12:00 PM |
2:30 AM
|
| 1:00 PM |
3:30 AM
|
| 2:00 PM |
4:30 AM
|
| 3:00 PM |
5:30 AM
|
| 4:00 PM |
6:30 AM
|
| 5:00 PM |
7:30 AM
|
| 6:00 PM |
8:30 AM
|
| 7:00 PM |
9:30 AM
|
| 8:00 PM |
10:30 AM
|
| 9:00 PM |
11:30 AM
|
| 10:00 PM |
12:30 PM
|
| 11:00 PM |
1:30 PM
|
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