Инструменты Intosoft

Iran to ICT

+3h 30m

Iran

IRSTSOURCE
UTC+03:30
HH12
:
MM00
  
12:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM

ICT

ICT
UTC+07:00
HH03
:
MM30
  
15:30 (24-hr)
12 AM6 AM12 PM6 PM12 AM
Iran
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.

IRSTICTTehranIsfahanMashhadTabrizBangkokHo Chi Minh CityHanoiJakarta
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

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

Iran runs on Iran Standard Time (IRST) at UTC+03:30. ICT runs on Indochina Time (ICT) at UTC+07:00. That puts Iran 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 Iran it is 12:30 PM in ICT. Midnight in Iran is 3:30 AM in ICT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Iran to ICT time conversion table

Iran (IRST)ICT (ICT)Day
12:00 AM3:30 AMsame day
6:00 AM9:30 AMsame day
7:00 AM10:30 AMsame day
8:00 AM11:30 AMsame day
9:00 AM12:30 PMsame day
12:00 PM3:30 PMsame day
3:00 PM6:30 PMsame day
5:00 PM8:30 PMsame day
6:00 PM9:30 PMsame day
9:00 PM12:30 AMnext day

Why people convert Iran to ICT time

  • Scheduling a call from Iran to ICT: a 10:00 AM start in Iran lands at 1:30 PM in ICT, so you can confirm the slot without doing the arithmetic yourself.
  • Finding shared working hours: both Iran 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.
  • Watching a live event or market open: Iran viewers need 12:30 PM in ICT to catch a 9:00 AM start there, and 8:30 PM if the event is anchored to Iran.
  • 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 Iran 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 Iran and ICT

Both Iran 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

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

Iran 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.

Frequently Asked Questions

What is the time difference between Iran and ICT?

Iran (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 Iran time to ICT time?

Add +3h 30m to Iran local time. For example, 9:00 AM in Iran 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 Iran.

What is the best time to call ICT from Iran?

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, Iran or ICT?

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

Do Iran and ICT use different time zones?

Iran (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 Iran–ICT difference?

Neither zone observes daylight saving time, so the +3h 30m offset between Iran and ICT is fixed all year.

Which other cities share Iran's time zone?

IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.

Which countries use IRST, Iran's zone?

IRST is used in Iran.

Is there a day difference between Iran and ICT?

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

What is the time difference between Iran and ICT?

ICT is +3h 30m from Iran.

What timezone is Iran in?

Iran operates on its local timezone.

What timezone is ICT in?

ICT operates on its local timezone.

Which countries use IRST (Iran Standard Time)?

IRST is used in Iran.

Does IRST observe daylight saving time?

Yes, IRST switches to IRDT during summer months.

What are some interesting 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).

Which cities are in the ICT timezone?

Major cities in the ICT timezone include Bangkok, Ho Chi Minh City, Hanoi, Jakarta, Phnom Penh, Vientiane.

What is the UTC offset for ICT?

Indochina Time (ICT) is at UTC+07:00.

What should I know about the ICT timezone?

Bangkok is one of the most visited cities in the world. ICT is 12 hours ahead of EST.

When is it midnight in Iran, what time is it in ICT?

When it is 12:00 AM (midnight) in Iran (IRST), it is +3h 30m later in ICT (ICT).