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 Halifax

-10h

Vietnam

ICTSOURCE

UTC+07:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Halifax

ADT

Canada · UTC-03:00☀ DST active

HH02

MM00

02:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Vietnam

Halifax

12:00 AM

2:00 PM-1

2:00 AM

4:00 PM-1

4:00 AM

6:00 PM-1

6:00 AM

8:00 PM-1

8:00 AM

10:00 PM-1

10:00 AM

12:00 AM

12:00 PM

2:00 AM

2:00 PM

4:00 AM

4:00 PM

6:00 AM

6:00 PM

8:00 AM

8:00 PM

10:00 AM

10:00 PM

12:00 PM

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

ICT and ADT on the World Map

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

ICT Zone

→

ADT 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

AST – Atlantic Standard Time

UTC-04:00

Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.

Countries in AST

Canada (Atlantic provinces)Puerto RicoUS Virgin IslandsDominican RepublicVenezuelaBoliviaBarbadosTrinidad and Tobago

Major Cities in AST

HalifaxSan JuanSanto DomingoCaracasLa PazFrederictonCharlottetown

Key Facts about AST

•Puerto Rico uses AST year-round and does not observe DST.
•AST is 1 hour ahead of EST.
•Halifax, the capital of Nova Scotia, is the largest city in AST Canada.

Daylight Saving:Yes – switches to ADT

Learn more about AST on Wikipedia

About Halifax

Wikipedia

Halifax operates on Atlantic Time (AST/ADT), UTC-4. As Canada's major Atlantic port and closest city to Europe, Halifax bridges North American and European business.

Population:440,000

Metro:465,000

Business Hours:9:00 AM - 5:00 PM AST

Currency:CAD (C$)

Stock Exchange:N/A (Uses TSX)

Key Landmarks

Halifax CitadelPeggy's CoveHalifax WaterfrontCanadian Museum of ImmigrationPublic Gardens

Did You Know?

Halifax harbors the second largest natural ice-free harbor in the world.

Learn more about ADT timezone →

Comparing Time Zones: Vietnam and Halifax

Vietnam runs on Indochina Time (ICT) at UTC+07:00. Halifax runs on Atlantic Daylight Time (ADT) at UTC-03:00, also currently on daylight saving time. That puts Vietnam 10 hours behind Halifax — a difference of -10h at the current offsets.

In practice, when it is 9:00 AM in Vietnam it is 11:00 PM in Halifax on the previous day. Midnight in Vietnam is 2:00 PM in Halifax.Halifax observes daylight saving time while Vietnam does not, so the gap narrows or widens by an hour part of the year.

Vietnam to Halifax time conversion table

Vietnam (ICT)	Halifax (ADT)	Day
12:00 AM	2:00 PM	previous day
6:00 AM	8:00 PM	previous day
7:00 AM	9:00 PM	previous day
8:00 AM	10:00 PM	previous day
9:00 AM	11:00 PM	previous day
12:00 PM	2:00 AM	same day
3:00 PM	5:00 AM	same day
5:00 PM	7:00 AM	same day
6:00 PM	8:00 AM	same day
9:00 PM	11:00 AM	same day

Why people convert Vietnam to Halifax time

Scheduling a call from Vietnam to Halifax: a 10:00 AM start in Vietnam lands at 12:00 AM in Halifax, so you can confirm the slot without doing the arithmetic yourself.
Handling a -10h gap: Vietnam and Halifax have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in Halifax is 11:00 PM in Vietnam.
Booking travel or deliveries: tracking Halifax local time against Vietnam keeps pickup windows and arrival estimates honest across the -10h offset.

Always state the zone abbreviation, not just the hour. "3:00 PM ICT" is unambiguous; "3 PM" across a -10h gap is not.
With a -10h gap there is no shared 9-to-5 window, so alternate the early start: one week Vietnam takes the early slot, the next week Halifax does.
Halifax: Clocks fall back on Sun, Nov 1, 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 AST (Atlantic Standard Time)

Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.

Best time to call between Vietnam and Halifax

With a -10h offset there is no overlap inside a normal 9 AM – 5 PM day. Halifax opens at 9:00 AM ADT, which is 11:00 PM in Vietnam, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

Vietnam and Halifax have no shared working hours because of the -10h gap. Teams need to alternate early starts or rely on asynchronous handovers.

Vietnam is 10 hours behind Halifax (ICT UTC+07:00 → ADT UTC-03:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Vietnam

Does not observe DST

Halifax

☀ Currently in DST

Standard: UTC-04:00 · DST: UTC-03:00

Clocks fall back on Sun, Nov 1, 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 Halifax?

Vietnam (ICT, UTC+07:00) is 10 hours behind Halifax (ADT, UTC-03:00). The gap is currently -10h.

How do I convert Vietnam time to Halifax time?

Add -10h to Vietnam local time. For example, 9:00 AM in Vietnam is 11:00 PM in Halifax (previous day).

What time is it in Halifax right now?

Halifax uses ADT at UTC-03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -10h offset from Vietnam.

What is the best time to call Halifax from Vietnam?

There is no shared working-hours window because of the -10h gap. The closest option is 1:00 PM in Vietnam, which is 3:00 AM in Halifax.

Which is behind, Vietnam or Halifax?

Vietnam is 10 hours behind Halifax. When it is 12:00 PM in Vietnam it is 2:00 AM in Halifax.

Do Vietnam and Halifax use different time zones?

Vietnam (Vietnam) uses ICT at UTC+07:00, while Halifax (Canada) uses ADT at UTC-03:00. The IANA identifiers are Asia/Ho_Chi_Minh and America/Halifax.

Does daylight saving time affect the Vietnam–Halifax difference?

Yes at the moment: Halifax is on daylight saving time and Vietnam is not, so the -10h 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 Halifax?

Not normally. The -10h gap only pushes the date over the previous day.

What is the time difference between Vietnam and Halifax?

Halifax is -10h from Vietnam.

What timezone is Vietnam in?

Vietnam operates on its local timezone.

What timezone is Halifax in?

Halifax operates on Atlantic Time (AST/ADT), UTC-4. As Canada's major Atlantic port and closest city to Europe, Halifax bridges North American and European business.