Riyadh to Tehran Time
AST to IRST Converter — 9 AM AST is 9:30 AM IRST
Riyadh is 0 hours and 30 minutes behind Tehran. Convert any time between Riyadh (AST) and Tehran (IRST/IRDT) instantly.
Riyadh
Saudi Arabia
Tehran
Iran
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Time Zone Comparison
Riyadh to Tehran Time Conversion Table
| Riyadh (AST) | Tehran (IRST) |
|---|---|
| 12:00 AM | 12:30 AM |
| 2:00 AM | 2:30 AM |
| 4:00 AM | 4:30 AM |
| 6:00 AM | 6:30 AM |
| 8:00 AM | 8:30 AM |
| 10:00 AM | 10:30 AM |
| 12:00 PM | 12:30 PM |
| 2:00 PM | 2:30 PM |
| 4:00 PM | 4:30 PM |
| 6:00 PM | 6:30 PM |
| 8:00 PM | 8:30 PM |
| 10:00 PM | 10:30 PM |
Riyadh & Tehran — Business & Scheduling Guide
Riyadh (Saudi Arabia) is the largest economy in the Middle East, with key industries in oil & gas, construction, finance, and tourism under Vision 2030. Tehran (Iran) is an important regional economy, known for diverse sectors including services and trade. With a 0.5-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 Riyadh and Tehran
With only a 0.5-hour gap, Riyadh and Tehran have generous overlapping work hours. Morning calls in the later time zone align well with mid-day in the other. Saudi business hours typically run 9 AM–5 PM Sunday–Thursday, with business often conducted over meals. Business hours typically follow a 9 AM–5 PM schedule. Most teams find that late morning to early afternoon offers the widest window for collaboration.
Daylight Saving Time Considerations
Tehran observes Daylight Saving Time (IRST/IRDT), while Riyadh stays on AST year-round. When Tehran switches to daylight time, the effective time difference shifts by 1 hour. This typically happens in spring and fall, and the exact dates vary by country. If you have recurring cross-timezone meetings, recalculate the schedule after each DST transition.
AST to IRST — Quick Reference
AST (AST) stands for the timezone used in Riyadh, Saudi Arabia (UTC+3). IRST (IRST/IRDT) is the timezone used in Tehran, Iran (UTC+3:30). Riyadh is 0 hours and 30 minutes behind Tehran.
To convert AST to IRST, add 0.5 hours to AST time. For example, AST 9:00 AM = IRST 9:30 AM.
Key Facts
- •Time difference: Riyadh (UTC+3) is 0 hours and 30 minutes behind Tehran (UTC+3:30).
- •Daylight Saving Time: Riyadh does not observe DST (AST). Tehran observes DST (IRST/IRDT).
- •Regions: Riyadh is located in Saudi Arabia and uses the AST time zone. Tehran is located in Iran and uses the IRST/IRDT time zone.
- •Best time to call: The best time to call between Riyadh and Tehran is 9:00 AM to 4:00 PM in Riyadh time, when both cities have overlapping standard working hours.
Frequently Asked Questions
What is the time difference between Riyadh and Tehran?
Riyadh is 0 hours and 30 minutes behind Tehran.
What time is it in Tehran when it's 9 AM in Riyadh?
When it's 9:00 AM in Riyadh, it is 9:30 AM in Tehran.
What time is 9 PM AST in IRST?
9 PM AST (Riyadh time) is 9:30 PM IRST (Tehran 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 Riyadh and Tehran?
The best time to schedule a meeting is between 9:00 AM to 4:00 PM in Riyadh time, when both cities are within standard working hours (9 AM – 5 PM). This gives you the maximum overlap window for real-time collaboration.
How do I convert AST to IRST?
AST (AST) is the timezone for Riyadh, Saudi Arabia (UTC+3). IRST (IRST/IRDT) is the timezone for Tehran, Iran (UTC+3:30). Riyadh is 0 hours and 30 minutes behind Tehran. Quick examples: 9 AM AST = 9:30 AM IRST, 12 PM AST = 12:30 PM IRST, 3 PM AST = 3:30 PM IRST, 6 PM AST = 6:30 PM IRST.
Is Riyadh ahead of or behind Tehran?
Riyadh is 30 minutes behind Tehran. When it's noon in Riyadh, it's 12:30 PM in Tehran.
Does Riyadh or Tehran change clocks for Daylight Saving Time?
No, Riyadh does not observe DST — it stays on AST year-round. Tehran observes DST and switches between IRST/IRDT. 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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