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 Prague

-1h 30m

Tehran

IRSTSOURCE

Iran · UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Prague

CEST

Czechia · UTC+02:00☀ DST active

HH10

MM30

10:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Tehran

Prague

12:00 AM

10:30 PM-1

2:00 AM

12:30 AM

4:00 AM

2:30 AM

6:00 AM

4:30 AM

8:00 AM

6:30 AM

10:00 AM

8:30 AM

12:00 PM

10:30 AM

2:00 PM

12:30 PM

4:00 PM

2:30 PM

6:00 PM

4:30 PM

8:00 PM

6:30 PM

10:00 PM

8:30 PM

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

IRST and CEST on the World Map

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

IRST Zone

→

CEST 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

CET – Central European Time

UTC+01:00

Central European Time (CET) is used across most of Western and Central Europe, 1 hour ahead of UTC.

Countries in CET

GermanyFranceItalySpainNetherlandsBelgiumAustriaSwitzerlandPolandCzech RepublicSwedenNorwayDenmarkHungaryCroatiaSerbiaSlovakiaSloveniaBosnia and HerzegovinaNorth MacedoniaAlbaniaMontenegroLuxembourgMaltaTunisiaAlgeriaNigeria

Major Cities in CET

ParisBerlinRomeMadridAmsterdamBrusselsViennaWarsawZurichStockholmOsloCopenhagenPragueBudapestBarcelonaMunichMilanLagos

Key Facts about CET

•CET covers more European countries than any other time zone.
•Spain uses CET despite being geographically aligned with GMT/WET.
•The Frankfurt Stock Exchange, Euronext (Amsterdam/Paris), and Borsa Italiana operate on CET.
•Over 500 million people live in the CET time zone.
•France moved to CET during the German occupation in WWII and never switched back.

Daylight Saving:Yes – switches to CEST

Learn more about CET 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 Prague

Wikipedia

Prague operates on Central European Time (CET/CEST). As Central Europe's tourism and tech hub, Prague coordinates with major EU markets.

Population:1.3 million

Metro:2.7 million

Business Hours:8:00 AM - 5:00 PM CET

Currency:CZK (Kč)

Stock Exchange:PSE (Prague Stock Exchange)

Key Landmarks

Prague CastleCharles BridgeOld Town SquareAstronomical ClockSt. Vitus Cathedral

Did You Know?

Czechia has the highest beer consumption per capita in the world.

Learn more about CEST timezone →

Understanding the -1h 30m Gap: Tehran vs Prague

Tehran runs on Iran Standard Time (IRST) at UTC+03:30. Prague runs on Central European Summer Time (CEST) at UTC+02:00, also currently on daylight saving time. That puts Tehran 1 hour 30 minutes behind Prague — a difference of -1h 30m at the current offsets.

In practice, when it is 9:00 AM in Tehran it is 7:30 AM in Prague. Midnight in Tehran is 10:30 PM in Prague.Prague observes daylight saving time while Tehran does not, so the gap narrows or widens by an hour part of the year.

Tehran to Prague time conversion table

Tehran (IRST)	Prague (CEST)	Day
12:00 AM	10:30 PM	previous day
6:00 AM	4:30 AM	same day
7:00 AM	5:30 AM	same day
8:00 AM	6:30 AM	same day
9:00 AM	7:30 AM	same day
12:00 PM	10:30 AM	same day
3:00 PM	1:30 PM	same day
5:00 PM	3:30 PM	same day
6:00 PM	4:30 PM	same day
9:00 PM	7:30 PM	same day

Why people convert Tehran to Prague time

Scheduling a call from Tehran to Prague: a 10:00 AM start in Tehran lands at 8:30 AM in Prague, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Tehran and Prague are inside the 9-to-5 working day between 10:30 AM and 5:00 PM IRST time (9:00 AM–3:30 PM CEST). That is roughly 6 hours 30 minutes of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in Tehran is 6:30 PM in Prague makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a -1h 30m gap is not.
Block 10:30 AM–5:00 PM IRST as the recurring meeting window if you work primarily from Tehran and need Prague colleagues present.
Prague: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local 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.

About CET (Central European Time)

Central European Time (CET) is the standard time zone for most of Europe, covering over 30 countries from Spain to Poland, and from Norway to Italy. CET is 1 hour ahead of GMT and is used by the European Union's most populous nations. During summer, most CET countries switch to Central European Summer Time (CEST, UTC+02:00). Major European financial markets in Frankfurt, Paris, and Amsterdam operate on CET.

Best time to call between Tehran and Prague

Both Tehran and Prague sit inside the 9 AM – 5 PM working day between 10:30 AM–5:00 PM IRST, which is 9:00 AM–3:30 PM CEST. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Tehran and Prague share 6 hours of working-hours overlap (10:30 AM–5:00 PM IRST), so scheduling a live meeting is straightforward.

Tehran is 1 hour 30 minutes behind Prague (IRST UTC+03:30 → CEST UTC+02:00). The shared working window is 10:30 AM–5:00 PM IRST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Tehran

Does not observe DST

Prague

☀ Currently in DST

Standard: UTC+01:00 · DST: UTC+02:00

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 Prague?

Tehran (IRST, UTC+03:30) is 1 hour 30 minutes behind Prague (CEST, UTC+02:00). The gap is currently -1h 30m.

How do I convert Tehran time to Prague time?

Add -1h 30m to Tehran local time. For example, 9:00 AM in Tehran is 7:30 AM in Prague.

What time is it in Prague right now?

Prague uses CEST at UTC+02:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h 30m offset from Tehran.

What is the best time to call Prague from Tehran?

Call between 10:30 AM and 5:00 PM IRST — that maps to 9:00 AM–3:30 PM CEST and keeps both parties inside the working day.

Which is behind, Tehran or Prague?

Tehran is 1 hour 30 minutes behind Prague. When it is 12:00 PM in Tehran it is 10:30 AM in Prague.

Do Tehran and Prague use different time zones?

Tehran (Iran) uses IRST at UTC+03:30, while Prague (Czechia) uses CEST at UTC+02:00. The IANA identifiers are Asia/Tehran and Europe/Prague.

Does daylight saving time affect the Tehran–Prague difference?

Yes at the moment: Prague is on daylight saving time and Tehran is not, so the -1h 30m gap shifts by an hour when exactly one of them changes clocks.

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 Prague?

Not normally. The -1h 30m gap only pushes the date over the previous day.

What is the time difference between Tehran and Prague?

Prague is -1h 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 Prague in?

Prague operates on Central European Time (CET/CEST). As Central Europe's tourism and tech hub, Prague coordinates with major EU 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 Prague?

Standard business hours in Prague are 8:00 AM - 5:00 PM CET.

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

The best overlap for a call is when both cities are in business hours. Tehran works 8:00 AM - 4:00 PM IRST and Prague works 8:00 AM - 5:00 PM CET (-1h 30m difference). Try scheduling during the overlapping window for maximum convenience.

What currencies are used in Tehran and Prague?

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

How do Tehran and Prague compare in size?

Tehran has a population of approximately 9.4 million (metro: 16.8 million), while Prague has approximately 1.3 million (metro: 2.7 million).

What are the major landmarks in Tehran and Prague?

Tehran is known for Azadi Tower, Golestan Palace, Grand Bazaar. Prague is famous for Prague Castle, Charles Bridge, Old Town Square.

Do Tehran and Prague have stock exchanges?

Yes. Tehran has the TSE (Tehran Stock Exchange) and Prague has the PSE (Prague Stock Exchange). The -1h 30m time difference affects trading hour overlaps between these exchanges.