Tehran to Phoenix Time
IRST to MST Converter — 9 AM IRST is 10:30 PM MST
Tehran is 10 hours and 30 minutes ahead of Phoenix. Convert any time between Tehran (IRST/IRDT) and Phoenix (MST) instantly.
Tehran
Iran
Phoenix
United States
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Time Zone Comparison
Tehran to Phoenix Time Conversion Table
| Tehran (IRST) | Phoenix (MST) |
|---|---|
| 12:00 AM | 1:30 PM |
| 2:00 AM | 3:30 PM |
| 4:00 AM | 5:30 PM |
| 6:00 AM | 7:30 PM |
| 8:00 AM | 9:30 PM |
| 10:00 AM | 11:30 PM |
| 12:00 PM | 1:30 AM |
| 2:00 PM | 3:30 AM |
| 4:00 PM | 5:30 AM |
| 6:00 PM | 7:30 AM |
| 8:00 PM | 9:30 AM |
| 10:00 PM | 11:30 AM |
Tehran & Phoenix — Business & Scheduling Guide
Tehran (Iran) is an important regional economy, with key industries in diverse sectors including services and trade. Phoenix (United States) is a global financial and tech hub, known for technology, finance, healthcare, and entertainment. With a 10.5-hour time difference, professionals frequently schedule cross-border calls between these two cities for international trade, remote team collaboration, and client meetings.
Scheduling Meetings Between Tehran and Phoenix
With Phoenix 10.5 hours behind Tehran, there is minimal overlap in standard business hours. Most teams alternate meeting times to share the burden of early-morning or late-evening calls fairly. Business hours typically follow a 9 AM–5 PM schedule. US business hours typically run 9 AM–5 PM, with a culture that values punctuality and efficiency. Consider recording meetings for those who can't attend live, and use shared documents for async collaboration.
Daylight Saving Time Considerations
Tehran observes Daylight Saving Time (IRST/IRDT), but Phoenix does not — it stays on MST year-round. This means the time difference between Tehran and Phoenix changes by 1 hour when Tehran switches clocks. During Iran's summer, the gap is 9.5–11.5 hours instead of the standard 10.5 hours. Mark DST transition dates on your calendar to avoid missed meetings.
IRST to MST — Quick Reference
IRST (IRST/IRDT) stands for the timezone used in Tehran, Iran (UTC+3:30). MST (MST) is the timezone used in Phoenix, United States (UTC-7). Tehran is 10 hours and 30 minutes ahead of Phoenix.
To convert IRST to MST, subtract 10.5 hours from IRST time. For example, IRST 9:00 AM = MST 10:30 PM (previous day).
Key Facts
- •Time difference: Tehran (UTC+3:30) is 10 hours and 30 minutes ahead of Phoenix (UTC-7).
- •Daylight Saving Time: Tehran observes DST (IRST/IRDT). Phoenix does not observe DST (MST).
- •Regions: Tehran is located in Iran and uses the IRST/IRDT time zone. Phoenix is located in United States and uses the MST time zone.
- •Best time to call: There are no overlapping standard work hours (9 AM - 5 PM) between these two cities.
Frequently Asked Questions
What is the time difference between Tehran and Phoenix?
Tehran is 10 hours and 30 minutes ahead of Phoenix.
What time is it in Phoenix when it's 9 AM in Tehran?
When it's 9:00 AM in Tehran, it is 10:30 PM in Phoenix (previous day).
What time is 9 PM IRST in MST?
9 PM IRST (Tehran time) is 10:30 AM MST (Phoenix time). This is a common time people check when scheduling evening calls across these two time zones.
When is the best time to schedule a meeting between Tehran and Phoenix?
There are no overlapping standard work hours (9 AM - 5 PM) between these two cities.
How do I convert IRST to MST?
IRST (IRST/IRDT) is the timezone for Tehran, Iran (UTC+3:30). MST (MST) is the timezone for Phoenix, United States (UTC-7). Tehran is 10 hours and 30 minutes ahead of Phoenix. Quick examples: 9 AM IRST = 10:30 PM MST, 12 PM IRST = 1:30 AM MST, 3 PM IRST = 4:30 AM MST, 6 PM IRST = 7:30 AM MST.
Is Tehran ahead of or behind Phoenix?
Tehran is 10 hours 30 minutes ahead of Phoenix. When it's noon in Tehran, it's 1:30 AM in Phoenix.
Does Tehran or Phoenix change clocks for Daylight Saving Time?
Yes, Tehran observes DST and switches between IRST/IRDT. Phoenix does not observe DST — it stays on MST year-round. Because only one city observes DST, the time difference shifts by 1 hour during transition periods (typically March/April and October/November).
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