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).

Tehran to EEST

-0h 30m

Tehran

IRSTSOURCE

Iran · UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

EEST

UTC+03:00☀ DST active

HH11

MM30

11:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Tehran

EEST

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 EEST on the World Map

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

IRST Zone

→

EEST 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

EEST – Eastern European Summer Time

UTC+03:00

Eastern European Summer Time (EEST, UTC+03:00) is the daylight saving period across eastern Europe, from late March to late October.

Countries in EEST

GreeceFinlandRomaniaBulgariaEstoniaLatviaLithuaniaUkraineMoldovaCyprus

Major Cities in EEST

AthensHelsinkiBucharestSofiaKyivRiga

Key Facts about EEST

•EEST runs from the last Sunday in March to the last Sunday in October.
•EEST is one hour ahead of Eastern European Time (EET, UTC+02:00).
•During EEST, eastern Europe is level with Moscow, Istanbul and Riyadh.
•EEST follows the EU-wide summer time schedule.

Daylight Saving:Yes – switches to EEST

Learn more about EEST 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 →

Tehran to EEST Time Difference – Complete Guide

Tehran runs on Iran Standard Time (IRST) at UTC+03:30. EEST runs on Eastern European Summer Time (EEST) at UTC+03:00. That puts Tehran 30 minutes behind EEST — 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 EEST. Midnight in Tehran is 11:30 PM in EEST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Tehran to EEST time conversion table

Tehran (IRST)	EEST (EEST)	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 EEST time

Scheduling a call from Tehran to EEST: a 10:00 AM start in Tehran lands at 9:30 AM in EEST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Tehran and EEST are inside the 9-to-5 working day between 9:30 AM and 5:00 PM IRST time (9:00 AM–4:30 PM EEST). That is roughly 7 hours 30 minutes of usable overlap.
Watching a live event or market open: Tehran viewers need 8:30 AM in EEST to catch a 9:00 AM start there, and 12:30 AM if the event is anchored to Tehran.

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 EEST 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 EEST (Eastern European Summer Time)

Eastern European Summer Time (EEST) is the daylight saving period used across eastern Europe, when clocks move one hour forward from Eastern European Time (EET, UTC+02:00) to UTC+03:00. It runs from the last Sunday in March to the last Sunday in October, in step with the rest of the European Union. EEST covers Greece, Finland, Romania, Bulgaria, the Baltic states, Ukraine and Moldova, and matches the offset used year-round by Moscow, Istanbul and Riyadh during those months. Athens and Helsinki both sit near the western edge of the EEST band, so summer evenings stay light well past 21:00.

Best time to call between Tehran and EEST

Both Tehran and EEST 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 EEST. 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 EEST 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 EEST (IRST UTC+03:30 → EEST UTC+03:00). The shared working window is 9:30 AM–5:00 PM IRST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Tehran

Does not observe DST

EEST

☀ Currently in DST

Standard: UTC+02:00 · DST: UTC+03:00

Clocks fall back on Sun, Oct 25, 2026

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 EEST?

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

How do I convert Tehran time to EEST time?

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

What time is it in EEST right now?

EEST uses EEST 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 EEST from Tehran?

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

Which is behind, Tehran or EEST?

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

Do Tehran and EEST use different time zones?

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

Does daylight saving time affect the Tehran–EEST difference?

Neither zone observes daylight saving time, so the -0h 30m offset between Tehran and EEST 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 EEST?

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

What is the time difference between Tehran and EEST?

EEST 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.