MDT to Iran
+9h 30mMDT
MDTSOURCEIran
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
MDT and IRST on the World Map
The map below highlights the MDT (Mountain Daylight Time) and IRST (Iran Standard Time) timezone regions across the globe.
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.
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.
Comparing Time Zones: MDT and Iran
MDT runs on Mountain Daylight Time (MDT) at UTC-06:00. Iran runs on Iran Standard Time (IRST) at UTC+03:30. That puts MDT 9 hours 30 minutes ahead of Iran — a difference of +9h 30m at the current offsets.
In practice, when it is 9:00 AM in MDT it is 6:30 PM in Iran. Midnight in MDT is 9:30 AM in Iran. Neither zone observes daylight saving time, so the offset between them stays constant all year.
MDT to Iran time conversion table
| MDT (MDT) | Iran (IRST) | Day |
|---|---|---|
| 12:00 AM | 9:30 AM | same day |
| 6:00 AM | 3:30 PM | same day |
| 7:00 AM | 4:30 PM | same day |
| 8:00 AM | 5:30 PM | same day |
| 9:00 AM | 6:30 PM | same day |
| 12:00 PM | 9:30 PM | same day |
| 3:00 PM | 12:30 AM | next day |
| 5:00 PM | 2:30 AM | next day |
| 6:00 PM | 3:30 AM | next day |
| 9:00 PM | 6:30 AM | next day |
Why people convert MDT to Iran time
- Scheduling a call from MDT to Iran: a 10:00 AM start in MDT lands at 7:30 PM in Iran, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +9h 30m gap: MDT and Iran 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 Iran is 6:30 PM in MDT.
- Coordinating a MDT-based team with Iran contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM MDT" 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 MDT takes the early slot, the next week Iran does.
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.
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.
Best time to call between MDT and Iran
With a +9h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. Iran opens at 9:00 AM IRST, which is 6:30 PM in MDT, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
MDT and Iran have no shared working hours because of the +9h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
MDT is 9 hours 30 minutes ahead of Iran (MDT UTC-06:00 → IRST UTC+03:30). 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
MDT
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 2026
Iran
Does not observe DST
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 MDT and Iran?
MDT (MDT, UTC-06:00) is 9 hours 30 minutes ahead of Iran (IRST, UTC+03:30). The gap is currently +9h 30m.
How do I convert MDT time to Iran time?
Add +9h 30m to MDT local time. For example, 9:00 AM in MDT is 6:30 PM in Iran.
What time is it in Iran right now?
Iran uses IRST at UTC+03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +9h 30m offset from MDT.
What is the best time to call Iran from MDT?
There is no shared working-hours window because of the +9h 30m gap. The closest option is 1:00 PM in MDT, which is 10:30 PM in Iran.
Which is ahead, MDT or Iran?
MDT is 9 hours 30 minutes ahead of Iran. When it is 12:00 PM in MDT it is 9:30 PM in Iran.
Do MDT and Iran use different time zones?
MDT uses MDT at UTC-06:00, while Iran (Iran) uses IRST at UTC+03:30. The IANA identifiers are America/Denver and Asia/Tehran.
Does daylight saving time affect the MDT–Iran difference?
Neither zone observes daylight saving time, so the +9h 30m offset between MDT and Iran is fixed all year.
Which other cities share MDT's time zone?
MDT also covers Denver, Calgary, Edmonton, Salt Lake City, Boise.
Which countries use MDT, MDT's zone?
MDT is used in United States (Mountain), Canada (Alberta).
Is there a day difference between MDT and Iran?
Not normally. The +9h 30m gap only pushes the date over for late-evening times.
What is the time difference between MDT and Iran?
Iran is +9h 30m from MDT.
What timezone is MDT in?
MDT operates on its local timezone.
What timezone is Iran in?
Iran operates on its local timezone.
Which countries use MDT (Mountain Daylight Time)?
MDT is used in United States (Mountain), Canada (Alberta).
Does MDT observe daylight saving time?
Yes, MDT switches to MST during summer months.
What are some interesting facts about MDT?
MDT shares the same offset as CST (UTC-06:00). Arizona does not switch to MDT, remaining on MST.
Which cities are in the IRST timezone?
Major cities in the IRST timezone include Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
What is the UTC offset for IRST?
Iran Standard Time (IRST) is at UTC+03:30. During daylight saving time, it shifts to IRDT.
What should I know about the IRST timezone?
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).
When is it midnight in MDT, what time is it in Iran?
When it is 12:00 AM (midnight) in MDT (MDT), it is +9h 30m later in Iran (IRST).
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