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 ICT

+3h 30m

Tehran

IRSTSOURCE

Iran · UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

ICT

UTC+07:00

HH03

MM30

15:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Tehran

ICT

12:00 AM

3:30 AM

2:00 AM

5:30 AM

4:00 AM

7:30 AM

6:00 AM

9:30 AM

8:00 AM

11:30 AM

10:00 AM

1:30 PM

12:00 PM

3:30 PM

2:00 PM

5:30 PM

4:00 PM

7:30 PM

6:00 PM

9:30 PM

8:00 PM

11:30 PM

10:00 PM

1:30 AM+1

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

IRST and ICT on the World Map

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

IRST Zone

→

ICT 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

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

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 →

Understanding the +3h 30m Gap: Tehran vs ICT

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

In practice, when it is 9:00 AM in Tehran it is 12:30 PM in ICT. Midnight in Tehran is 3:30 AM in ICT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Tehran to ICT time conversion table

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

Why people convert Tehran to ICT time

Scheduling a call from Tehran to ICT: a 10:00 AM start in Tehran lands at 1:30 PM in ICT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Tehran and ICT are inside the 9-to-5 working day between 9:00 AM and 1:30 PM IRST time (12:30 PM–5:00 PM ICT). That is roughly 4 hours 30 minutes of usable overlap.
Coordinating a Tehran-based team with ICT contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a +3h 30m gap is not.
Block 9:00 AM–1:30 PM IRST as the recurring meeting window if you work primarily from Tehran and need ICT 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 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.

Best time to call between Tehran and ICT

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

Business hours overlap

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

Tehran is 3 hours 30 minutes ahead of ICT (IRST UTC+03:30 → ICT UTC+07:00). The shared working window is 9:00 AM–1:30 PM 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 ICT?

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

How do I convert Tehran time to ICT time?

Add +3h 30m to Tehran local time. For example, 9:00 AM in Tehran is 12:30 PM in ICT.

What time is it in ICT right now?

ICT uses ICT at UTC+07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +3h 30m offset from Tehran.

What is the best time to call ICT from Tehran?

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

Which is ahead, Tehran or ICT?

Tehran is 3 hours 30 minutes ahead of ICT. When it is 12:00 PM in Tehran it is 3:30 PM in ICT.

Do Tehran and ICT use different time zones?

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

Does daylight saving time affect the Tehran–ICT difference?

Neither zone observes daylight saving time, so the +3h 30m offset between Tehran and ICT 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 ICT?

Not normally. The +3h 30m gap only pushes the date over for late-evening times.

What is the time difference between Tehran and ICT?

ICT is +3h 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.