Iran to MDT
-9h 30mIran
IRSTSOURCEMDT
MDTGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and MDT on the World Map
The map below highlights the IRST (Iran Standard Time) and MDT (Mountain Daylight Time) timezone regions across the globe.
IRST – Iran Standard Time
UTC+03:30Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.
- •IRST is one of only a few time zones with a 30-minute offset.
- •Iran observes daylight saving time, switching to IRDT (UTC+04:30).
- •Tehran has a metropolitan population of over 16 million.
MDT – Mountain Daylight Time
UTC-06:00Mountain Daylight Time (MDT) is the daylight saving offset in the Mountain Time Zone, 6 hours behind UTC.
- •MDT shares the same offset as CST (UTC-06:00).
- •Arizona does not switch to MDT, remaining on MST.
Iran to MDT Time Difference – Complete Guide
Iran runs on Iran Standard Time (IRST) at UTC+03:30. MDT runs on Mountain Daylight Time (MDT) at UTC-06:00. That puts Iran 9 hours 30 minutes behind MDT — a difference of -9h 30m at the current offsets.
In practice, when it is 9:00 AM in Iran it is 11:30 PM in MDT on the previous day. Midnight in Iran is 2:30 PM in MDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Iran to MDT time conversion table
| Iran (IRST) | MDT (MDT) | Day |
|---|---|---|
| 12:00 AM | 2:30 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 |
| 12:00 PM | 2:30 AM | same day |
| 3:00 PM | 5:30 AM | same day |
| 5:00 PM | 7:30 AM | same day |
| 6:00 PM | 8:30 AM | same day |
| 9:00 PM | 11:30 AM | same day |
Why people convert Iran to MDT time
- Scheduling a call from Iran to MDT: a 10:00 AM start in Iran lands at 12:30 AM in MDT, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -9h 30m gap: Iran and MDT have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in MDT is 11:30 PM in Iran.
- Booking travel or deliveries: tracking MDT local time against Iran keeps pickup windows and arrival estimates honest across the -9h 30m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a -9h 30m gap is not.
- With a -9h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week Iran takes the early slot, the next week MDT does.
About IRST (Iran Standard Time)
Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.
About MDT (Mountain Daylight Time)
Mountain Daylight Time (MDT) is observed during summer months in the Mountain Time Zone, except in Arizona which stays on MST year-round. MDT aligns with Central Standard Time (CST) at UTC-06:00.
Best time to call between Iran and MDT
With a -9h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. MDT opens at 9:00 AM MDT, which is 11:30 PM in Iran, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Iran and MDT have no shared working hours because of the -9h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
Iran is 9 hours 30 minutes behind MDT (IRST UTC+03:30 → MDT UTC-06:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Iran
Does not observe DST
MDT
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between Iran and MDT?
Iran (IRST, UTC+03:30) is 9 hours 30 minutes behind MDT (MDT, UTC-06:00). The gap is currently -9h 30m.
How do I convert Iran time to MDT time?
Add -9h 30m to Iran local time. For example, 9:00 AM in Iran is 11:30 PM in MDT (previous day).
What time is it in MDT right now?
MDT uses MDT at UTC-06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -9h 30m offset from Iran.
What is the best time to call MDT from Iran?
There is no shared working-hours window because of the -9h 30m gap. The closest option is 1:00 PM in Iran, which is 3:30 AM in MDT.
Which is behind, Iran or MDT?
Iran is 9 hours 30 minutes behind MDT. When it is 12:00 PM in Iran it is 2:30 AM in MDT.
Do Iran and MDT use different time zones?
Iran (Iran) uses IRST at UTC+03:30, while MDT uses MDT at UTC-06:00. The IANA identifiers are Asia/Tehran and America/Denver.
Does daylight saving time affect the Iran–MDT difference?
Neither zone observes daylight saving time, so the -9h 30m offset between Iran and MDT is fixed all year.
Which other cities share Iran's time zone?
IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
Which countries use IRST, Iran's zone?
IRST is used in Iran.
Is there a day difference between Iran and MDT?
Not normally. The -9h 30m gap only pushes the date over the previous day.
What is the time difference between Iran and MDT?
MDT is -9h 30m from Iran.
What timezone is Iran in?
Iran operates on its local timezone.
What timezone is MDT in?
MDT operates on its local timezone.
Which countries use IRST (Iran Standard Time)?
IRST is used in Iran.
Does IRST observe daylight saving time?
Yes, IRST switches to IRDT during summer months.
What are some interesting facts about IRST?
IRST is one of only a few time zones with a 30-minute offset. Iran observes daylight saving time, switching to IRDT (UTC+04:30).
Which cities are in the MDT timezone?
Major cities in the MDT timezone include Denver, Calgary, Edmonton, Salt Lake City, Boise.
What is the UTC offset for MDT?
Mountain Daylight Time (MDT) is at UTC-06:00. During daylight saving time, it shifts to MST.
What should I know about the MDT timezone?
MDT shares the same offset as CST (UTC-06:00). Arizona does not switch to MDT, remaining on MST.
When is it midnight in Iran, what time is it in MDT?
When it is 12:00 AM (midnight) in Iran (IRST), it is -9h 30m later in MDT (MDT).
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See every conversion from Iran →·See every conversion from MDT →