Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

Helsinki to Tehran

+0h 30m

Helsinki

EESTSOURCE

Finland · UTC+03:00☀ DST active

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

Helsinki

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)

EEST and IRST on the World Map

The map below highlights the EEST (Eastern European Time) and IRST (Iran Standard Time) timezone regions across the globe.

EEST Zone

→

IRST Zone

Explore all world timezones interactively →

EET – Eastern European Time

UTC+02:00

Eastern European Time (EET) is used in Eastern Europe, the Middle East, and northeastern Africa, 2 hours ahead of UTC.

Countries in EET

FinlandGreeceRomaniaBulgariaUkraineEgyptIsraelLebanonJordanLithuaniaLatviaEstoniaMoldovaLibyaSyriaPalestineCyprus

Major Cities in EET

CairoAthensHelsinkiBucharestKyivSofiaJerusalemTel AvivBeirutVilniusRigaTallinn

Key Facts about EET

•EET covers countries across three continents: Europe, Asia, and Africa.
•Cairo is the most populous city in the EET zone.
•Turkey used to be on EET but permanently moved to UTC+03:00 in 2016.
•Finland, the Baltic states, and Greece all use EET.

Daylight Saving:Yes – switches to EEST

Learn more about EET 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 Helsinki

Wikipedia

Helsinki operates on Eastern European Time (EET/EEST), UTC+2. As a global gaming and design hub, Helsinki coordinates with EU and Russian markets.

Population:656,000

Metro:1.5 million

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

Currency:EUR (€)

Stock Exchange:Nasdaq Helsinki

Key Landmarks

Helsinki CathedralSuomenlinna FortressTemppeliaukio ChurchMarket SquareDesign District

Did You Know?

Finland has been ranked the world's happiest country for several consecutive years.

Learn more about EEST 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 →

Comparing Time Zones: Helsinki and Tehran

Helsinki runs on Eastern European Summer Time (EEST) at UTC+03:00, currently observing daylight saving time. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Helsinki 30 minutes ahead of Tehran — a difference of +0h 30m at the current offsets.

In practice, when it is 9:00 AM in Helsinki it is 9:30 AM in Tehran. Midnight in Helsinki is 12:30 AM in Tehran.Helsinki observes daylight saving time while Tehran does not, so the gap narrows or widens by an hour part of the year.

Helsinki to Tehran time conversion table

Helsinki (EEST)	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 Helsinki to Tehran time

Scheduling a call from Helsinki to Tehran: a 10:00 AM start in Helsinki lands at 10:30 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Helsinki and Tehran are inside the 9-to-5 working day between 9:00 AM and 4:30 PM EEST time (9:30 AM–5:00 PM IRST). That is roughly 7 hours 30 minutes of usable overlap.
Booking travel or deliveries: tracking Tehran local time against Helsinki keeps pickup windows and arrival estimates honest across the +0h 30m offset.

Always state the zone abbreviation, not just the hour. "3:00 PM EEST" is unambiguous; "3 PM" across a +0h 30m gap is not.
Block 9:00 AM–4:30 PM EEST as the recurring meeting window if you work primarily from Helsinki and need Tehran colleagues present.
Helsinki: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the +0h 30m gap.

About EET (Eastern European Time)

Eastern European Time (EET) covers a wide geographical area including Eastern Europe (Finland, Greece, Romania, Bulgaria, Ukraine), the Middle East (Israel, Lebanon, Jordan), and northeastern Africa (Egypt, Libya). During summer, most EET countries switch to Eastern European Summer Time (EEST, UTC+03:00). Turkey permanently moved to UTC+03:00 in 2016, effectively leaving EET.

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 Helsinki and Tehran

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

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

Helsinki is 30 minutes ahead of Tehran (EEST UTC+03:00 → IRST UTC+03:30). The shared working window is 9:00 AM–4:30 PM EEST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Helsinki

☀ Currently in DST

Standard: UTC+02:00 · DST: UTC+03:00

Clocks fall back on Sun, Oct 25, 2026

Tehran

Does not observe DST

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 Helsinki and Tehran?

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

How do I convert Helsinki time to Tehran time?

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

What is the best time to call Tehran from Helsinki?

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

Which is ahead, Helsinki or Tehran?

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

Do Helsinki and Tehran use different time zones?

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

Does daylight saving time affect the Helsinki–Tehran difference?

Yes at the moment: Helsinki is on daylight saving time and Tehran is not, so the +0h 30m gap shifts by an hour when exactly one of them changes clocks.

Which other cities share Helsinki's time zone?

EEST also covers Cairo, Athens, Helsinki, Bucharest, Kyiv, Sofia, Jerusalem, Tel Aviv and 4 more.

Which countries use EEST, Helsinki's zone?

EEST is used in Finland, Greece, Romania, Bulgaria, Ukraine, Egypt, Israel, Lebanon and 9 more.

Is there a day difference between Helsinki and Tehran?

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

What is the time difference between Helsinki and Tehran?

Tehran is +0h 30m from Helsinki.

What timezone is Helsinki in?

Helsinki operates on Eastern European Time (EET/EEST), UTC+2. As a global gaming and design hub, Helsinki coordinates with EU and Russian 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 Helsinki?

Standard business hours in Helsinki are 8:00 AM - 4:00 PM EET.

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 Helsinki and Tehran?

The best overlap for a call is when both cities are in business hours. Helsinki works 8:00 AM - 4:00 PM EET 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 Helsinki and Tehran?

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

How do Helsinki and Tehran compare in size?

Helsinki has a population of approximately 656,000 (metro: 1.5 million), while Tehran has approximately 9.4 million (metro: 16.8 million).

What are the major landmarks in Helsinki and Tehran?

Helsinki is known for Helsinki Cathedral, Suomenlinna Fortress, Temppeliaukio Church. Tehran is famous for Azadi Tower, Golestan Palace, Grand Bazaar.

Do Helsinki and Tehran have stock exchanges?

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