MST/MDT to IRST time converter

IRST is 9 hours 30 minutes ahead of MST/MDT. When it is 9:00 AM in MST/MDT, it is 6:30 PM in IRST.

MST/MDT MDT

Friday, October 16, 2026

IRST UTC+3:30

Saturday, October 17, 2026

MST/MDT
Mountain Standard Time
Fri, Oct 16
MDTUTC-6
IRST
Iran Standard Time
Sat, Oct 17
UTC+3:30+9h 30m
Finding your time zone…
Shared working hours (9:00–18:00)

MST/MDT to IRST conversion table

Every hour of today in MST/MDT and the matching time in IRST. Light rows are typical working hours (9:00–18:00).

MST/MDTIRST
12:00 AM9:30 AM
1:00 AM10:30 AM
2:00 AM11:30 AM
3:00 AM12:30 PM
4:00 AM1:30 PM
5:00 AM2:30 PM
6:00 AM3:30 PM
7:00 AM4:30 PM
8:00 AM5:30 PM
9:00 AM6:30 PM
10:00 AM7:30 PM
11:00 AM8:30 PM
12:00 PM9:30 PM
1:00 PM10:30 PM
2:00 PM11:30 PM
3:00 PM12:30 AM+1 day
4:00 PM1:30 AM+1 day
5:00 PM2:30 AM+1 day
6:00 PM3:30 AM+1 day
7:00 PM4:30 AM+1 day
8:00 PM5:30 AM+1 day
9:00 PM6:30 AM+1 day
10:00 PM7:30 AM+1 day
11:00 PM8:30 AM+1 day

Best time to call or meet

Working hours don't overlap fully. The closest fit is 7:00 AM – 8:30 AM in MST/MDT (4:30 PM – 6:00 PM in IRST): working hours on one side, early or late on the other.

Daylight saving time and the difference

The difference changes during the year because MST/MDT and IRST switch clocks on different dates:

  • Oct 16, 2026 – Nov 1, 2026: +9h 30m
  • Nov 1, 2026 – Mar 14, 2027: +10h 30m
  • Mar 14, 2027 – Oct 16, 2027: +9h 30m

More conversions

IRST to MSTMST to UTCMST to GMTMST to ESTMST to CSTMST to PSTMST to CETMST to MSKMST to GSTMST to PKTMST to ISTMST to SGTMST to PHT
UTC to IRSTGMT to IRSTEST to IRSTCST to IRSTPST to IRSTCET to IRSTMSK to IRSTGST to IRSTPKT to IRSTIST to IRSTSGT to IRSTPHT to IRST

Questions and answers

What is the time difference between MST/MDT and IRST?

IRST is 9 hours 30 minutes ahead of MST/MDT.

What time is it in IRST when it is 9 AM in MST/MDT?

When it is 9:00 AM in MST/MDT, it is 6:30 PM in IRST.

When is the best time to call IRST from MST/MDT?

Working hours don't overlap fully. The closest fit is 7:00 AM – 8:30 AM in MST/MDT (4:30 PM – 6:00 PM in IRST): working hours on one side, early or late on the other.

Does the time difference between MST/MDT and IRST change?

Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.