Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

Tehran to Riyadh

-0h 30m

Tehran

IRSTSOURCE

Iran · UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Riyadh

AST

Saudi Arabia · UTC+03:00

HH11

MM30

11:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Tehran

Riyadh

12:00 AM

11:30 PM-1

2:00 AM

1:30 AM

4:00 AM

3:30 AM

6:00 AM

5:30 AM

8:00 AM

7:30 AM

10:00 AM

9:30 AM

12:00 PM

11:30 AM

2:00 PM

1:30 PM

4:00 PM

3:30 PM

6:00 PM

5:30 PM

8:00 PM

7:30 PM

10:00 PM

9:30 PM

Green rows indicate typical business hours (9 AM - 5 PM)

IRST and AST on the World Map

The map below highlights the IRST (Iran Standard Time) and AST (Arabia Standard Time) timezone regions across the globe.

IRST Zone

→

AST Zone

Explore all world timezones interactively →

IRST – Iran Standard Time

UTC+03:30

Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.

Countries in IRST

Iran

Major Cities in IRST

TehranIsfahanMashhadTabrizShirazKaraj

Key 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).
•Tehran has a metropolitan population of over 16 million.

Daylight Saving:Yes – switches to IRDT

Learn more about IRST on Wikipedia

AST – Arabia Standard Time

UTC+03:00

Arabia Standard Time (AST, UTC+03:00) is the time zone for Saudi Arabia and the other Gulf states of the Arabian peninsula.

Countries in AST

Saudi ArabiaQatarKuwaitBahrainIraqYemen

Major Cities in AST

RiyadhJeddahDohaKuwait CityBaghdad

Key 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.
•Riyadh is one hour ahead of Central European Time in winter.
•The AST abbreviation is shared with Atlantic Standard Time (UTC-04:00).

Daylight Saving:No – UTC+03:00 year-round

Learn more about AST on Wikipedia

About Tehran

Wikipedia

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.

Population:9.4 million

Metro:16.8 million

Business Hours:8:00 AM - 4:00 PM IRST

Currency:IRR (﷼)

Stock Exchange:TSE (Tehran Stock Exchange)

Key Landmarks

Azadi TowerGolestan PalaceGrand BazaarMilad TowerTabiat Bridge

Did You Know?

Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).

Learn more about IRST timezone →

About Riyadh

Wikipedia

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.

Population:7.7 million

Metro:7.7 million

Business Hours:8:00 AM - 4:00 PM AST (Sunday-Thursday)

Currency:SAR (﷼)

Stock Exchange:Tadawul (Saudi Stock Exchange)

Key Landmarks

Kingdom CentreMasmak FortressNational MuseumAl Faisaliyah CenterDiriyah

Did You Know?

Riyadh is growing rapidly as part of Saudi Vision 2030 modernization.

Learn more about AST timezone →

Everything You Need to Know About Tehran and Riyadh Time

Tehran runs on Iran Standard Time (IRST) at UTC+03:30. Riyadh runs on Arabian Standard Time (AST) at UTC+03:00. That puts Tehran 30 minutes behind Riyadh — a difference of -0h 30m at the current offsets.

In practice, when it is 9:00 AM in Tehran it is 8:30 AM in Riyadh. Midnight in Tehran is 11:30 PM in Riyadh. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Tehran to Riyadh time conversion table

Tehran (IRST)	Riyadh (AST)	Day
12:00 AM	11:30 PM	previous day
6:00 AM	5:30 AM	same day
7:00 AM	6:30 AM	same day
8:00 AM	7:30 AM	same day
9:00 AM	8:30 AM	same day
12:00 PM	11:30 AM	same day
3:00 PM	2:30 PM	same day
5:00 PM	4:30 PM	same day
6:00 PM	5:30 PM	same day
9:00 PM	8:30 PM	same day

Why people convert Tehran to Riyadh time

Scheduling a call from Tehran to Riyadh: a 10:00 AM start in Tehran lands at 9:30 AM in Riyadh, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Tehran and Riyadh are inside the 9-to-5 working day between 9:30 AM and 5:00 PM IRST time (9:00 AM–4:30 PM AST). That is roughly 7 hours 30 minutes of usable overlap.
Coordinating a Tehran-based team with Riyadh 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 IRST" is unambiguous; "3 PM" across a -0h 30m gap is not.
Block 9:30 AM–5:00 PM IRST as the recurring meeting window if you work primarily from Tehran and need Riyadh colleagues present.

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 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.

Best time to call between Tehran and Riyadh

Both Tehran and Riyadh sit inside the 9 AM – 5 PM working day between 9:30 AM–5:00 PM IRST, which is 9:00 AM–4:30 PM AST. That gives roughly 7 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Tehran and Riyadh share 7 hours of working-hours overlap (9:30 AM–5:00 PM IRST), so scheduling a live meeting is straightforward.

Tehran is 30 minutes behind Riyadh (IRST UTC+03:30 → AST UTC+03:00). The shared working window is 9:30 AM–5:00 PM IRST. 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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between Tehran and Riyadh?

Tehran (IRST, UTC+03:30) is 30 minutes behind Riyadh (AST, UTC+03:00). The gap is currently -0h 30m.

How do I convert Tehran time to Riyadh time?

Add -0h 30m to Tehran local time. For example, 9:00 AM in Tehran is 8:30 AM in Riyadh.

What time is it in Riyadh right now?

Riyadh uses AST at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -0h 30m offset from Tehran.

What is the best time to call Riyadh from Tehran?

Call between 9:30 AM and 5:00 PM IRST — that maps to 9:00 AM–4:30 PM AST and keeps both parties inside the working day.

Which is behind, Tehran or Riyadh?

Tehran is 30 minutes behind Riyadh. When it is 12:00 PM in Tehran it is 11:30 AM in Riyadh.

Do Tehran and Riyadh use different time zones?

Tehran (Iran) uses IRST at UTC+03:30, while Riyadh (Saudi Arabia) uses AST at UTC+03:00. The IANA identifiers are Asia/Tehran and Asia/Riyadh.

Does daylight saving time affect the Tehran–Riyadh difference?

Neither zone observes daylight saving time, so the -0h 30m offset between Tehran and Riyadh is fixed all year.

Which other cities share Tehran's time zone?

IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.

Which countries use IRST, Tehran's zone?

IRST is used in Iran.

Is there a day difference between Tehran and Riyadh?

Not normally. The -0h 30m gap only pushes the date over the previous day.

What is the time difference between Tehran and Riyadh?

Riyadh is -0h 30m from Tehran.

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 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 are the business hours in Tehran?

Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.

What are the business hours in Riyadh?

Standard business hours in Riyadh are 8:00 AM - 4:00 PM AST (Sunday-Thursday).

What is the best time to schedule a call between Tehran and Riyadh?

The best overlap for a call is when both cities are in business hours. Tehran works 8:00 AM - 4:00 PM IRST and Riyadh works 8:00 AM - 4:00 PM AST (Sunday-Thursday) (-0h 30m difference). Try scheduling during the overlapping window for maximum convenience.

What currencies are used in Tehran and Riyadh?

Tehran uses IRR (﷼) while Riyadh uses SAR (﷼). Check current exchange rates when planning travel or business between these cities.

How do Tehran and Riyadh compare in size?

Tehran has a population of approximately 9.4 million (metro: 16.8 million), while Riyadh has approximately 7.7 million (metro: 7.7 million).

What are the major landmarks in Tehran and Riyadh?

Tehran is known for Azadi Tower, Golestan Palace, Grand Bazaar. Riyadh is famous for Kingdom Centre, Masmak Fortress, National Museum.

Do Tehran and Riyadh have stock exchanges?

Yes. Tehran has the TSE (Tehran Stock Exchange) and Riyadh has the Tadawul (Saudi Stock Exchange). The -0h 30m time difference affects trading hour overlaps between these exchanges.