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.

Bangkok to Tehran

-3h 30m

Bangkok

ICTSOURCE

Thailand · UTC+07:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Tehran

IRST

Iran · UTC+03:30

HH08

MM30

08:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Bangkok

Tehran

12:00 AM

8:30 PM-1

2:00 AM

10:30 PM-1

4:00 AM

12:30 AM

6:00 AM

2:30 AM

8:00 AM

4:30 AM

10:00 AM

6:30 AM

12:00 PM

8:30 AM

2:00 PM

10:30 AM

4:00 PM

12:30 PM

6:00 PM

2:30 PM

8:00 PM

4:30 PM

10:00 PM

6:30 PM

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

ICT and IRST on the World Map

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

ICT Zone

→

IRST Zone

Explore all world timezones interactively →

ICT – Indochina Time

UTC+07:00

Indochina Time (ICT) is the time zone for Vietnam, Thailand, Laos, and Cambodia, 7 hours ahead of UTC.

Countries in ICT

ThailandVietnamCambodiaLaosIndonesia (WIB)

Major Cities in ICT

BangkokHo Chi Minh CityHanoiJakartaPhnom PenhVientiane

Key Facts about ICT

•Bangkok is one of the most visited cities in the world.
•ICT is 12 hours ahead of EST.
•Thailand, Vietnam, and Cambodia all share ICT.

Daylight Saving:No – UTC+07:00 year-round

Learn more about ICT 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 Bangkok

Wikipedia

Bangkok operates on Indochina Time (ICT), UTC+7. As Southeast Asia's largest economy hub, Bangkok bridges East Asian and South Asian business hours.

Population:8.3 million

Metro:14.6 million

Business Hours:8:30 AM - 5:30 PM ICT

Currency:THB (฿)

Stock Exchange:SET (Stock Exchange of Thailand)

Key Landmarks

Grand PalaceWat ArunWat PhoChatuchak MarketKhao San Road

Did You Know?

Bangkok is one of the world's most visited cities, with over 22 million visitors annually.

Learn more about ICT 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: Bangkok and Tehran

Bangkok runs on Indochina Time (ICT) at UTC+07:00. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Bangkok 3 hours 30 minutes behind Tehran — a difference of -3h 30m at the current offsets.

In practice, when it is 9:00 AM in Bangkok it is 5:30 AM in Tehran. Midnight in Bangkok is 8:30 PM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Bangkok to Tehran time conversion table

Bangkok (ICT)	Tehran (IRST)	Day
12:00 AM	8:30 PM	previous day
6:00 AM	2:30 AM	same day
7:00 AM	3:30 AM	same day
8:00 AM	4:30 AM	same day
9:00 AM	5:30 AM	same day
12:00 PM	8:30 AM	same day
3:00 PM	11:30 AM	same day
5:00 PM	1:30 PM	same day
6:00 PM	2:30 PM	same day
9:00 PM	5:30 PM	same day

Why people convert Bangkok to Tehran time

Scheduling a call from Bangkok to Tehran: a 10:00 AM start in Bangkok lands at 6:30 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Bangkok and Tehran are inside the 9-to-5 working day between 12:30 PM and 5:00 PM ICT time (9:00 AM–1:30 PM IRST). That is roughly 4 hours 30 minutes of usable overlap.
Watching a live event or market open: Bangkok viewers need 5:30 AM in Tehran to catch a 9:00 AM start there, and 3:30 AM if the event is anchored to Bangkok.

Always state the zone abbreviation, not just the hour. "3:00 PM ICT" is unambiguous; "3 PM" across a -3h 30m gap is not.
Block 12:30 PM–5:00 PM ICT as the recurring meeting window if you work primarily from Bangkok and need Tehran colleagues present.

About ICT (Indochina Time)

Indochina Time (ICT) is used across Southeast Asia including Vietnam, Thailand, Laos, and Cambodia. Indonesia (Western time, WIB) also uses UTC+07:00. ICT does not observe daylight saving 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.

Best time to call between Bangkok and Tehran

Both Bangkok and Tehran sit inside the 9 AM – 5 PM working day between 12:30 PM–5:00 PM ICT, which is 9:00 AM–1:30 PM IRST. That gives roughly 4 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Bangkok and Tehran overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.

Bangkok is 3 hours 30 minutes behind Tehran (ICT UTC+07:00 → IRST UTC+03:30). The shared working window is 12:30 PM–5:00 PM ICT. 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 Bangkok and Tehran?

Bangkok (ICT, UTC+07:00) is 3 hours 30 minutes behind Tehran (IRST, UTC+03:30). The gap is currently -3h 30m.

How do I convert Bangkok time to Tehran time?

Add -3h 30m to Bangkok local time. For example, 9:00 AM in Bangkok is 5:30 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 -3h 30m offset from Bangkok.

What is the best time to call Tehran from Bangkok?

Call between 12:30 PM and 5:00 PM ICT — that maps to 9:00 AM–1:30 PM IRST and keeps both parties inside the working day.

Which is behind, Bangkok or Tehran?

Bangkok is 3 hours 30 minutes behind Tehran. When it is 12:00 PM in Bangkok it is 8:30 AM in Tehran.

Do Bangkok and Tehran use different time zones?

Bangkok (Thailand) uses ICT at UTC+07:00, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Asia/Bangkok and Asia/Tehran.

Does daylight saving time affect the Bangkok–Tehran difference?

Neither zone observes daylight saving time, so the -3h 30m offset between Bangkok and Tehran is fixed all year.

Which other cities share Bangkok's time zone?

ICT also covers Bangkok, Ho Chi Minh City, Hanoi, Jakarta, Phnom Penh, Vientiane.

Which countries use ICT, Bangkok's zone?

ICT is used in Thailand, Vietnam, Cambodia, Laos, Indonesia (WIB).

Is there a day difference between Bangkok and Tehran?

Not normally. The -3h 30m gap only pushes the date over the previous day.

What is the time difference between Bangkok and Tehran?

Tehran is -3h 30m from Bangkok.

What timezone is Bangkok in?

Bangkok operates on Indochina Time (ICT), UTC+7. As Southeast Asia's largest economy hub, Bangkok bridges East Asian and South 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 Bangkok?

Standard business hours in Bangkok are 8:30 AM - 5:30 PM ICT.

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 Bangkok and Tehran?

The best overlap for a call is when both cities are in business hours. Bangkok works 8:30 AM - 5:30 PM ICT and Tehran works 8:00 AM - 4:00 PM IRST (-3h 30m difference). Try scheduling during the overlapping window for maximum convenience.

What currencies are used in Bangkok and Tehran?

Bangkok uses THB (฿) while Tehran uses IRR (﷼). Check current exchange rates when planning travel or business between these cities.

How do Bangkok and Tehran compare in size?

Bangkok has a population of approximately 8.3 million (metro: 14.6 million), while Tehran has approximately 9.4 million (metro: 16.8 million).

What are the major landmarks in Bangkok and Tehran?

Bangkok is known for Grand Palace, Wat Arun, Wat Pho. Tehran is famous for Azadi Tower, Golestan Palace, Grand Bazaar.

Do Bangkok and Tehran have stock exchanges?

Yes. Bangkok has the SET (Stock Exchange of Thailand) and Tehran has the TSE (Tehran Stock Exchange). The -3h 30m time difference affects trading hour overlaps between these exchanges.