Convert IRST to MST — Time Difference Between Iran Standard Time and Mountain Standard Time

How to Convert IRST to MST

Drag the slider on the IRST timeline to pick your time — the MST time updates instantly. You can also click the time display to type a specific hour or pick one from the 15-minute interval dropdown, and use the date picker to check a different day.

What Is the Time Difference Between IRST and MST?

Mountain Standard Time (MST) is 10:30 hours behind Iran Standard Time (IRST). To convert, subtract 10:30 hours — for example, 9:00 AM IRST is 10:30 PM (previous day) MST.

IRST to MST Quick Reference

IRST to MST Meeting Planner

Use the color-coded table above to find overlapping work hours between Tehran and Edmonton. Amber rows mark daytime hours — pick a slot that falls in amber on both sides for a meeting that works for everyone.

Why Trust This IRST to MST Converter?

Timezoney uses the IANA Time Zone Database — the same source that powers your phone and computer — so every conversion handles daylight saving transitions and half-hour offsets automatically.