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).

Vietnam to Dublin

-6h

Vietnam

ICTSOURCE

UTC+07:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Dublin

IST

Ireland · UTC+01:00☀ DST active

HH06

MM00

06:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Vietnam

Dublin

12:00 AM

6:00 PM-1

2:00 AM

8:00 PM-1

4:00 AM

10:00 PM-1

6:00 AM

12:00 AM

8:00 AM

2:00 AM

10:00 AM

4:00 AM

12:00 PM

6:00 AM

2:00 PM

8:00 AM

4:00 PM

10:00 AM

6:00 PM

12:00 PM

8:00 PM

2:00 PM

10:00 PM

4:00 PM

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

ICT and IST on the World Map

The map below highlights the ICT (Indochina Time) and IST (Greenwich Mean Time) timezone regions across the globe.

ICT Zone

→

IST 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

GMT – Greenwich Mean Time

UTC+00:00

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.

Countries in GMT

United KingdomIrelandIcelandPortugal (mainland)GhanaSenegalMaliMauritaniaGambiaGuineaSierra LeoneLiberiaIvory CoastBurkina FasoMorocco (historically)

Major Cities in GMT

LondonDublinLisbonAccraReykjavikEdinburghCasablancaDakarBamakoAbidjanConakryFreetownMonrovia

Key Facts about GMT

•GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
•The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
•GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
•Iceland uses GMT year-round and never observes daylight saving time.
•The UK switches from GMT to BST (British Summer Time) in late March each year.

Daylight Saving:Yes – switches to BST

Learn more about GMT on Wikipedia

Understanding the -6h Gap: Vietnam vs Dublin

Vietnam runs on Indochina Time (ICT) at UTC+07:00. Dublin runs on Irish Standard Time (IST) at UTC+01:00, also currently on daylight saving time. That puts Vietnam 6 hours behind Dublin — a difference of -6h at the current offsets.

In practice, when it is 9:00 AM in Vietnam it is 3:00 AM in Dublin. Midnight in Vietnam is 6:00 PM in Dublin.Dublin observes daylight saving time while Vietnam does not, so the gap narrows or widens by an hour part of the year.

Vietnam to Dublin time conversion table

Vietnam (ICT)	Dublin (IST)	Day
12:00 AM	6:00 PM	previous day
6:00 AM	12:00 AM	same day
7:00 AM	1:00 AM	same day
8:00 AM	2:00 AM	same day
9:00 AM	3:00 AM	same day
12:00 PM	6:00 AM	same day
3:00 PM	9:00 AM	same day
5:00 PM	11:00 AM	same day
6:00 PM	12:00 PM	same day
9:00 PM	3:00 PM	same day

Why people convert Vietnam to Dublin time

Scheduling a call from Vietnam to Dublin: a 10:00 AM start in Vietnam lands at 4:00 AM in Dublin, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Vietnam and Dublin are inside the 9-to-5 working day between 3:00 PM and 5:00 PM ICT time (9:00 AM–11:00 AM IST). That is roughly 2 hours of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in Vietnam is 2:00 PM in Dublin makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM ICT" is unambiguous; "3 PM" across a -6h gap is not.
Block 3:00 PM–5:00 PM ICT as the recurring meeting window if you work primarily from Vietnam and need Dublin colleagues present.
Dublin: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.

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 GMT (Greenwich Mean Time)

Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.

Best time to call between Vietnam and Dublin

Both Vietnam and Dublin sit inside the 9 AM – 5 PM working day between 3:00 PM–5:00 PM ICT, which is 9:00 AM–11:00 AM IST. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

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

Vietnam is 6 hours behind Dublin (ICT UTC+07:00 → IST UTC+01:00). The shared working window is 3:00 PM–5:00 PM ICT. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Vietnam

Does not observe DST

Dublin

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

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 Vietnam and Dublin?

Vietnam (ICT, UTC+07:00) is 6 hours behind Dublin (IST, UTC+01:00). The gap is currently -6h.

How do I convert Vietnam time to Dublin time?

Add -6h to Vietnam local time. For example, 9:00 AM in Vietnam is 3:00 AM in Dublin.

What time is it in Dublin right now?

Dublin uses IST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -6h offset from Vietnam.

What is the best time to call Dublin from Vietnam?

Call between 3:00 PM and 5:00 PM ICT — that maps to 9:00 AM–11:00 AM IST and keeps both parties inside the working day.

Which is behind, Vietnam or Dublin?

Vietnam is 6 hours behind Dublin. When it is 12:00 PM in Vietnam it is 6:00 AM in Dublin.

Do Vietnam and Dublin use different time zones?

Vietnam (Vietnam) uses ICT at UTC+07:00, while Dublin (Ireland) uses IST at UTC+01:00. The IANA identifiers are Asia/Ho_Chi_Minh and Europe/Dublin.

Does daylight saving time affect the Vietnam–Dublin difference?

Yes at the moment: Dublin is on daylight saving time and Vietnam is not, so the -6h gap shifts by an hour when exactly one of them changes clocks.

Which other cities share Vietnam's time zone?

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

Which countries use ICT, Vietnam's zone?

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

Is there a day difference between Vietnam and Dublin?

Not normally. The -6h gap only pushes the date over the previous day.

What is the time difference between Vietnam and Dublin?

Dublin is -6h from Vietnam.

What timezone is Vietnam in?

Vietnam operates on its local timezone.

What timezone is Dublin in?

Dublin operates on its local timezone.

Which countries use ICT (Indochina Time)?

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

Does ICT observe daylight saving time?

No, ICT does not observe daylight saving time and remains at UTC+07:00 year-round.

What are some interesting facts about ICT?

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

Which cities are in the GMT timezone?

Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.

What is the UTC offset for GMT?

Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.

What should I know about the GMT timezone?

GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.