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 Tokyo

+5h 30m

Tehran

IRSTSOURCE

Iran · UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Tokyo

JST

Japan · UTC+09:00

HH05

MM30

17:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Tehran

Tokyo

12:00 AM

5:30 AM

2:00 AM

7:30 AM

4:00 AM

9:30 AM

6:00 AM

11:30 AM

8:00 AM

1:30 PM

10:00 AM

3:30 PM

12:00 PM

5:30 PM

2:00 PM

7:30 PM

4:00 PM

9:30 PM

6:00 PM

11:30 PM

8:00 PM

1:30 AM+1

10:00 PM

3:30 AM+1

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

IRST and JST on the World Map

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

IRST Zone

→

JST 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

JST – Japan Standard Time

UTC+09:00

Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.

Countries in JST

Japan

Major Cities in JST

TokyoOsakaYokohamaNagoyaSapporoKyotoKobeFukuokaHiroshima

Key Facts about JST

•Japan does not observe daylight saving time.
•Tokyo is the most populous metropolitan area in the world.
•The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
•JST is 14 hours ahead of EST and 9 hours ahead of GMT.

Daylight Saving:No – UTC+09:00 year-round

Learn more about JST 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 Tokyo

Wikipedia

Tokyo operates on Japan Standard Time (JST), which is 14 hours ahead of New York. As Asia's largest financial hub, Tokyo trading hours are crucial for global markets.

Population:14 million

Metro:37.4 million

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

Currency:JPY (¥)

Stock Exchange:TSE (Tokyo Stock Exchange)

Key Landmarks

Tokyo TowerShibuya CrossingSenso-ji TempleImperial PalaceTokyo Skytree

Did You Know?

The Tokyo subway system moves approximately 8.7 million passengers daily.

Learn more about JST timezone →

Tehran vs Tokyo: Offsets, DST and Best Call Times

Tehran runs on Iran Standard Time (IRST) at UTC+03:30. Tokyo runs on Japan Standard Time (JST) at UTC+09:00. That puts Tehran 5 hours 30 minutes ahead of Tokyo — a difference of +5h 30m at the current offsets.

In practice, when it is 9:00 AM in Tehran it is 2:30 PM in Tokyo. Midnight in Tehran is 5:30 AM in Tokyo. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Tehran to Tokyo time conversion table

Tehran (IRST)	Tokyo (JST)	Day
12:00 AM	5:30 AM	same day
6:00 AM	11:30 AM	same day
7:00 AM	12:30 PM	same day
8:00 AM	1:30 PM	same day
9:00 AM	2:30 PM	same day
12:00 PM	5:30 PM	same day
3:00 PM	8:30 PM	same day
5:00 PM	10:30 PM	same day
6:00 PM	11:30 PM	same day
9:00 PM	2:30 AM	next day

Why people convert Tehran to Tokyo time

Scheduling a call from Tehran to Tokyo: a 10:00 AM start in Tehran lands at 3:30 PM in Tokyo, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Tehran and Tokyo are inside the 9-to-5 working day between 9:00 AM and 11:30 AM IRST time (2:30 PM–5:00 PM JST). That is roughly 2 hours 30 minutes of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in Tehran is 1:30 AM in Tokyo 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 +5h 30m gap is not.
Block 9:00 AM–11:30 AM IRST as the recurring meeting window if you work primarily from Tehran and need Tokyo 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 JST (Japan Standard Time)

Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.

Best time to call between Tehran and Tokyo

Both Tehran and Tokyo sit inside the 9 AM – 5 PM working day between 9:00 AM–11:30 AM IRST, which is 2:30 PM–5:00 PM JST. That gives roughly 2 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Tehran and Tokyo overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.

Tehran is 5 hours 30 minutes ahead of Tokyo (IRST UTC+03:30 → JST UTC+09:00). The shared working window is 9:00 AM–11:30 AM 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 Tokyo?

Tehran (IRST, UTC+03:30) is 5 hours 30 minutes ahead of Tokyo (JST, UTC+09:00). The gap is currently +5h 30m.

How do I convert Tehran time to Tokyo time?

Add +5h 30m to Tehran local time. For example, 9:00 AM in Tehran is 2:30 PM in Tokyo.

What time is it in Tokyo right now?

Tokyo uses JST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +5h 30m offset from Tehran.

What is the best time to call Tokyo from Tehran?

Call between 9:00 AM and 11:30 AM IRST — that maps to 2:30 PM–5:00 PM JST and keeps both parties inside the working day.

Which is ahead, Tehran or Tokyo?

Tehran is 5 hours 30 minutes ahead of Tokyo. When it is 12:00 PM in Tehran it is 5:30 PM in Tokyo.

Do Tehran and Tokyo use different time zones?

Tehran (Iran) uses IRST at UTC+03:30, while Tokyo (Japan) uses JST at UTC+09:00. The IANA identifiers are Asia/Tehran and Asia/Tokyo.

Does daylight saving time affect the Tehran–Tokyo difference?

Neither zone observes daylight saving time, so the +5h 30m offset between Tehran and Tokyo 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 Tokyo?

Not normally. The +5h 30m gap only pushes the date over for late-evening times.

What is the time difference between Tehran and Tokyo?

Tokyo is +5h 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 Tokyo in?

Tokyo operates on Japan Standard Time (JST), which is 14 hours ahead of New York. As Asia's largest financial hub, Tokyo trading hours are crucial for global 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 Tokyo?

Standard business hours in Tokyo are 9:00 AM - 6:00 PM JST.

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

The best overlap for a call is when both cities are in business hours. Tehran works 8:00 AM - 4:00 PM IRST and Tokyo works 9:00 AM - 6:00 PM JST (+5h 30m difference). Try scheduling during the overlapping window for maximum convenience.

What currencies are used in Tehran and Tokyo?

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

How do Tehran and Tokyo compare in size?

Tehran has a population of approximately 9.4 million (metro: 16.8 million), while Tokyo has approximately 14 million (metro: 37.4 million).

What are the major landmarks in Tehran and Tokyo?

Tehran is known for Azadi Tower, Golestan Palace, Grand Bazaar. Tokyo is famous for Tokyo Tower, Shibuya Crossing, Senso-ji Temple.

Do Tehran and Tokyo have stock exchanges?

Yes. Tehran has the TSE (Tehran Stock Exchange) and Tokyo has the TSE (Tokyo Stock Exchange). The +5h 30m time difference affects trading hour overlaps between these exchanges.