Riyadh to Tehran
+0h 30mRiyadh
ASTSOURCETehran
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and IRST on the World Map
The map below highlights the AST (Arabia Standard Time) and IRST (Iran Standard Time) timezone regions across the globe.
AST – Arabia Standard Time
UTC+03:00Arabia Standard Time (AST, UTC+03:00) is the time zone for Saudi Arabia and the other Gulf states of the Arabian peninsula.
- •None of the Gulf states on Arabia Standard Time observe daylight saving.
- •AST is the same offset as Moscow Standard Time and East Africa Time.
- •Riyadh is one hour ahead of Central European Time in winter.
- •The AST abbreviation is shared with Atlantic Standard Time (UTC-04:00).
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.
About Riyadh
WikipediaRiyadh operates on Arabia Standard Time (AST), UTC+3. As OPEC's de facto capital and home to Tadawul, Riyadh time impacts global energy markets.
Riyadh is growing rapidly as part of Saudi Vision 2030 modernization.
About Tehran
WikipediaTehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).
Riyadh to Tehran Time Difference – Complete Guide
Riyadh runs on Arabian Standard Time (AST) at UTC+03:00. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Riyadh 30 minutes ahead of Tehran — a difference of +0h 30m at the current offsets.
In practice, when it is 9:00 AM in Riyadh it is 9:30 AM in Tehran. Midnight in Riyadh is 12:30 AM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Riyadh to Tehran time conversion table
| Riyadh (AST) | Tehran (IRST) | Day |
|---|---|---|
| 12:00 AM | 12:30 AM | same day |
| 6:00 AM | 6:30 AM | same day |
| 7:00 AM | 7:30 AM | same day |
| 8:00 AM | 8:30 AM | same day |
| 9:00 AM | 9:30 AM | same day |
| 12:00 PM | 12:30 PM | same day |
| 3:00 PM | 3:30 PM | same day |
| 5:00 PM | 5:30 PM | same day |
| 6:00 PM | 6:30 PM | same day |
| 9:00 PM | 9:30 PM | same day |
Why people convert Riyadh to Tehran time
- Scheduling a call from Riyadh to Tehran: a 10:00 AM start in Riyadh lands at 10:30 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Riyadh and Tehran are inside the 9-to-5 working day between 9:00 AM and 4:30 PM AST time (9:30 AM–5:00 PM IRST). That is roughly 7 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in Riyadh is 8:30 PM in Tehran makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +0h 30m gap is not.
- Block 9:00 AM–4:30 PM AST as the recurring meeting window if you work primarily from Riyadh and need Tehran colleagues present.
About AST (Arabia Standard Time)
Arabia Standard Time (AST) is fixed at UTC+03:00 all year across Saudi Arabia, Qatar, Kuwait, Bahrain, Iraq and Yemen. None of these countries observes daylight saving time, so the offset never changes. The abbreviation collides with Atlantic Standard Time (UTC-04:00) used in eastern Canada and the Caribbean; this page covers the Arabian peninsula meaning. Arabia Standard Time is the same offset as Moscow Standard Time and East Africa Time, which makes scheduling with Europe straightforward — Riyadh is one hour ahead of Central European Time in winter and level with it during European summer time.
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 Riyadh and Tehran
Both Riyadh and Tehran sit inside the 9 AM – 5 PM working day between 9:00 AM–4:30 PM AST, which is 9:30 AM–5:00 PM IRST. That gives roughly 7 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Riyadh and Tehran share 7 hours of working-hours overlap (9:00 AM–4:30 PM AST), so scheduling a live meeting is straightforward.
Riyadh is 30 minutes ahead of Tehran (AST UTC+03:00 → IRST UTC+03:30). The shared working window is 9:00 AM–4:30 PM AST. Remember to re-check around daylight-saving transitions.
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 Riyadh and Tehran?
Riyadh (AST, UTC+03:00) is 30 minutes ahead of Tehran (IRST, UTC+03:30). The gap is currently +0h 30m.
How do I convert Riyadh time to Tehran time?
Add +0h 30m to Riyadh local time. For example, 9:00 AM in Riyadh is 9:30 AM in Tehran.
What time is it in Tehran right now?
Tehran 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 +0h 30m offset from Riyadh.
What is the best time to call Tehran from Riyadh?
Call between 9:00 AM and 4:30 PM AST — that maps to 9:30 AM–5:00 PM IRST and keeps both parties inside the working day.
Which is ahead, Riyadh or Tehran?
Riyadh is 30 minutes ahead of Tehran. When it is 12:00 PM in Riyadh it is 12:30 PM in Tehran.
Do Riyadh and Tehran use different time zones?
Riyadh (Saudi Arabia) uses AST at UTC+03:00, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Asia/Riyadh and Asia/Tehran.
Does daylight saving time affect the Riyadh–Tehran difference?
Neither zone observes daylight saving time, so the +0h 30m offset between Riyadh and Tehran is fixed all year.
Which other cities share Riyadh's time zone?
AST also covers Riyadh, Jeddah, Doha, Kuwait City, Baghdad.
Which countries use AST, Riyadh's zone?
AST is used in Saudi Arabia, Qatar, Kuwait, Bahrain, Iraq, Yemen.
Is there a day difference between Riyadh and Tehran?
Not normally. The +0h 30m gap only pushes the date over for late-evening times.
What is the time difference between Riyadh and Tehran?
Tehran is +0h 30m from Riyadh.
What timezone is Riyadh in?
Riyadh operates on Arabia Standard Time (AST), UTC+3. As OPEC's de facto capital and home to Tadawul, Riyadh time impacts global energy markets.
What timezone is Tehran in?
Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
What are the business hours in Riyadh?
Standard business hours in Riyadh are 8:00 AM - 4:00 PM AST (Sunday-Thursday).
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
What is the best time to schedule a call between Riyadh and Tehran?
The best overlap for a call is when both cities are in business hours. Riyadh works 8:00 AM - 4:00 PM AST (Sunday-Thursday) and Tehran works 8:00 AM - 4:00 PM IRST (+0h 30m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Riyadh and Tehran?
Riyadh uses SAR (﷼) while Tehran uses IRR (﷼). Check current exchange rates when planning travel or business between these cities.
How do Riyadh and Tehran compare in size?
Riyadh has a population of approximately 7.7 million (metro: 7.7 million), while Tehran has approximately 9.4 million (metro: 16.8 million).
What are the major landmarks in Riyadh and Tehran?
Riyadh is known for Kingdom Centre, Masmak Fortress, National Museum. Tehran is famous for Azadi Tower, Golestan Palace, Grand Bazaar.
Do Riyadh and Tehran have stock exchanges?
Yes. Riyadh has the Tadawul (Saudi Stock Exchange) and Tehran has the TSE (Tehran Stock Exchange). The +0h 30m time difference affects trading hour overlaps between these exchanges.
Which countries use AST (Arabia Standard Time)?
AST is used in Saudi Arabia, Qatar, Kuwait, Bahrain, Iraq, Yemen.
Does AST observe daylight saving time?
No, AST does not observe daylight saving time and remains at UTC+03:00 year-round.
What are some interesting facts about AST?
None of the Gulf states on Arabia Standard Time observe daylight saving. AST is the same offset as Moscow Standard Time and East Africa Time.
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 Riyadh, what time is it in Tehran?
When it is 12:00 AM (midnight) in Riyadh (AST), it is +0h 30m later in Tehran (IRST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More Riyadh time conversions
- riyadh to saudi arabia
- riyadh to dubai
- riyadh to mumbai
- riyadh to delhi
- riyadh to bangalore
- riyadh to kathmandu
- riyadh to bangkok
- riyadh to singapore
- riyadh to hong kong
- riyadh to shanghai
- riyadh to beijing
- riyadh to tokyo
- riyadh to osaka
- riyadh to new york
- riyadh to london
- riyadh to sydney
- riyadh to los angeles
- riyadh to paris
- riyadh to berlin
- riyadh to toronto
- new york to riyadh
- london to riyadh
- dubai to riyadh
- tokyo to riyadh
- singapore to riyadh
- sydney to riyadh
- los angeles to riyadh
- paris to riyadh
- delhi to riyadh
- mumbai to riyadh
- berlin to riyadh
- hong kong to riyadh
- toronto to riyadh
- kathmandu to riyadh
See every conversion from Riyadh →·See every conversion from Tehran →