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.

Istanbul to Tehran

+0h 30m

Istanbul

TRTSOURCE

Turkey · UTC+03:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Tehran

IRST

Iran · UTC+03:30

HH12

MM30

12:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Istanbul

Tehran

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

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

TRT and IRST on the World Map

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

TRT Zone

→

IRST Zone

Explore all world timezones interactively →

TRT – Turkey Time

UTC+03:00

Turkey Time (TRT, UTC+03:00) is the single time zone used across Turkey, fixed year round since 2016.

Countries in TRT

Turkey

Major Cities in TRT

IstanbulAnkaraIzmirBursaAntalya

Key Facts about TRT

•Turkey has used a permanent UTC+03:00 since September 2016.
•TRT is level with Moscow Standard Time and Arabia Standard Time all year.
•Because Turkey kept summer time permanently, western cities see very late winter sunrises.
•Turkey previously observed daylight saving time from 1973 to 2016.

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

Learn more about TRT on Wikipedia

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

About Istanbul

Wikipedia

Istanbul operates on Turkey Time (TRT), UTC+3 year-round. As a transcontinental city, Istanbul bridges European and Asian business hours.

Population:15.5 million

Metro:15.8 million

Business Hours:9:00 AM - 6:00 PM TRT

Currency:TRY (₺)

Stock Exchange:Borsa Istanbul

Key Landmarks

Hagia SophiaBlue MosqueTopkapi PalaceGrand BazaarGalata Tower

Did You Know?

The Grand Bazaar is one of the world's oldest and largest covered markets with 4,000+ shops.

Learn more about TRT timezone →

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 →

Time Conversion Guide: Istanbul to Tehran

Istanbul runs on Türkiye Standard Time (TRT) at UTC+03:00. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Istanbul 30 minutes ahead of Tehran — a difference of +0h 30m at the current offsets.

In practice, when it is 9:00 AM in Istanbul it is 9:30 AM in Tehran. Midnight in Istanbul is 12:30 AM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Istanbul to Tehran time conversion table

Istanbul (TRT)	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 Istanbul to Tehran time

Scheduling a call from Istanbul to Tehran: a 10:00 AM start in Istanbul lands at 10:30 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Istanbul and Tehran are inside the 9-to-5 working day between 9:00 AM and 4:30 PM TRT time (9:30 AM–5:00 PM IRST). That is roughly 7 hours 30 minutes of usable overlap.
Watching a live event or market open: Istanbul viewers need 9:30 AM in Tehran to catch a 9:00 AM start there, and 11:30 PM if the event is anchored to Istanbul.

Always state the zone abbreviation, not just the hour. "3:00 PM TRT" is unambiguous; "3 PM" across a +0h 30m gap is not.
Block 9:00 AM–4:30 PM TRT as the recurring meeting window if you work primarily from Istanbul and need Tehran colleagues present.

About TRT (Turkey Time)

Turkey Time (TRT) is fixed at UTC+03:00 all year. Turkey abolished seasonal clock changes in September 2016, moving to a permanent UTC+03:00 so the whole country stays on what was formerly summer time. That leaves Istanbul, which sits close to 29°E, on an offset well ahead of its solar time — sunrise in mid-winter comes after 08:30 local. TRT shares its offset with Moscow Standard Time, Arabia Standard Time and East Africa Time, so Istanbul is level with Moscow and Riyadh all year and one hour ahead of Central European Time during the European winter.

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 Istanbul and Tehran

Both Istanbul and Tehran sit inside the 9 AM – 5 PM working day between 9:00 AM–4:30 PM TRT, 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

Istanbul and Tehran share 7 hours of working-hours overlap (9:00 AM–4:30 PM TRT), so scheduling a live meeting is straightforward.

Istanbul is 30 minutes ahead of Tehran (TRT UTC+03:00 → IRST UTC+03:30). The shared working window is 9:00 AM–4:30 PM TRT. 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 Istanbul and Tehran?

Istanbul (TRT, UTC+03:00) is 30 minutes ahead of Tehran (IRST, UTC+03:30). The gap is currently +0h 30m.

How do I convert Istanbul time to Tehran time?

Add +0h 30m to Istanbul local time. For example, 9:00 AM in Istanbul 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 Istanbul.

What is the best time to call Tehran from Istanbul?

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

Which is ahead, Istanbul or Tehran?

Istanbul is 30 minutes ahead of Tehran. When it is 12:00 PM in Istanbul it is 12:30 PM in Tehran.

Do Istanbul and Tehran use different time zones?

Istanbul (Turkey) uses TRT at UTC+03:00, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Europe/Istanbul and Asia/Tehran.

Does daylight saving time affect the Istanbul–Tehran difference?

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

Which other cities share Istanbul's time zone?

TRT also covers Istanbul, Ankara, Izmir, Bursa, Antalya.

Which countries use TRT, Istanbul's zone?

TRT is used in Turkey.

Is there a day difference between Istanbul and Tehran?

Not normally. The +0h 30m gap only pushes the date over for late-evening times.

What is the time difference between Istanbul and Tehran?

Tehran is +0h 30m from Istanbul.

What timezone is Istanbul in?

Istanbul operates on Turkey Time (TRT), UTC+3 year-round. As a transcontinental city, Istanbul bridges European and Asian business hours.

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 Istanbul?

Standard business hours in Istanbul are 9:00 AM - 6:00 PM TRT.

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 Istanbul and Tehran?

The best overlap for a call is when both cities are in business hours. Istanbul works 9:00 AM - 6:00 PM TRT 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 Istanbul and Tehran?

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

How do Istanbul and Tehran compare in size?

Istanbul has a population of approximately 15.5 million (metro: 15.8 million), while Tehran has approximately 9.4 million (metro: 16.8 million).

What are the major landmarks in Istanbul and Tehran?

Istanbul is known for Hagia Sophia, Blue Mosque, Topkapi Palace. Tehran is famous for Azadi Tower, Golestan Palace, Grand Bazaar.

Do Istanbul and Tehran have stock exchanges?

Yes. Istanbul has the Borsa Istanbul and Tehran has the TSE (Tehran Stock Exchange). The +0h 30m time difference affects trading hour overlaps between these exchanges.