Outils Intosoft

Ho Chi Minh to AST

-11h

Ho Chi Minh

ICTSOURCE
Vietnam · UTC+07:00
HH12
:
MM00
  
12:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM

AST

AST
UTC-03:00☀ DST active
HH01
:
MM00
  
01:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM
Ho Chi Minh
AST
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 AST on the World Map

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

ICTASTBangkokHo Chi Minh CityHanoiJakartaHalifaxSan JuanSanto DomingoCaracas
ICT Zone
→
AST 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 Ho Chi Minh

Wikipedia

Ho Chi Minh City operates on Indochina Time (ICT), UTC+7. As Vietnam's economic powerhouse and a manufacturing hub, Saigon drives Southeast Asian trade.

Population:9 million
Metro:13 million
Business Hours:8:00 AM - 5:00 PM ICT
Currency:VND (₫)
Stock Exchange:HOSE (Ho Chi Minh Stock Exchange)
Key Landmarks
Notre-Dame CathedralWar Remnants MuseumBen Thanh MarketIndependence PalaceCu Chi Tunnels
Did You Know?

The city has over 5 million motorbikes, outnumbering cars significantly.

Learn more about ICT timezone →

Everything You Need to Know About Ho Chi Minh and AST Time

Ho Chi Minh runs on Indochina Time (ICT) at UTC+07:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts Ho Chi Minh 11 hours behind AST — a difference of -11h at the current offsets.

In practice, when it is 9:00 AM in Ho Chi Minh it is 10:00 PM in AST on the previous day. Midnight in Ho Chi Minh is 1:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Ho Chi Minh to AST time conversion table

Ho Chi Minh (ICT)AST (AST)Day
12:00 AM1:00 PMprevious day
6:00 AM7:00 PMprevious day
7:00 AM8:00 PMprevious day
8:00 AM9:00 PMprevious day
9:00 AM10:00 PMprevious day
12:00 PM1:00 AMsame day
3:00 PM4:00 AMsame day
5:00 PM6:00 AMsame day
6:00 PM7:00 AMsame day
9:00 PM10:00 AMsame day

Why people convert Ho Chi Minh to AST time

  • Scheduling a call from Ho Chi Minh to AST: a 10:00 AM start in Ho Chi Minh lands at 11:00 PM in AST the previous day, so you can confirm the slot without doing the arithmetic yourself.
  • Handling a -11h gap: Ho Chi Minh and AST 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 AST is 10:00 PM in Ho Chi Minh.
  • Keeping family and friends in sync: knowing that 8:00 PM in Ho Chi Minh is 9:00 AM in AST 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 -11h gap is not.
  • With a -11h gap there is no shared 9-to-5 window, so alternate the early start: one week Ho Chi Minh takes the early slot, the next week AST does.

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 Ho Chi Minh and AST

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

Business hours overlap

Ho Chi Minh and AST have no shared working hours because of the -11h gap. Teams need to alternate early starts or rely on asynchronous handovers.

Ho Chi Minh is 11 hours behind AST (ICT UTC+07:00 → AST UTC-04:00). 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

Ho Chi Minh

Does not observe DST

AST

☀ 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 Ho Chi Minh and AST?

Ho Chi Minh (ICT, UTC+07:00) is 11 hours behind AST (AST, UTC-04:00). The gap is currently -11h.

How do I convert Ho Chi Minh time to AST time?

Add -11h to Ho Chi Minh local time. For example, 9:00 AM in Ho Chi Minh is 10:00 PM in AST (previous day).

What time is it in AST right now?

AST uses AST at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -11h offset from Ho Chi Minh.

What is the best time to call AST from Ho Chi Minh?

There is no shared working-hours window because of the -11h gap. The closest option is 1:00 PM in Ho Chi Minh, which is 2:00 AM in AST.

Which is behind, Ho Chi Minh or AST?

Ho Chi Minh is 11 hours behind AST. When it is 12:00 PM in Ho Chi Minh it is 1:00 AM in AST.

Do Ho Chi Minh and AST use different time zones?

Ho Chi Minh (Vietnam) uses ICT at UTC+07:00, while AST uses AST at UTC-04:00. The IANA identifiers are Asia/Ho_Chi_Minh and America/Halifax.

Does daylight saving time affect the Ho Chi Minh–AST difference?

Neither zone observes daylight saving time, so the -11h offset between Ho Chi Minh and AST is fixed all year.

Which other cities share Ho Chi Minh's time zone?

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

Which countries use ICT, Ho Chi Minh's zone?

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

Is there a day difference between Ho Chi Minh and AST?

Not normally. The -11h gap only pushes the date over the previous day.

What is the time difference between Ho Chi Minh and AST?

AST is -11h from Ho Chi Minh.

What timezone is Ho Chi Minh in?

Ho Chi Minh City operates on Indochina Time (ICT), UTC+7. As Vietnam's economic powerhouse and a manufacturing hub, Saigon drives Southeast Asian trade.

What timezone is AST in?

AST operates on its local timezone.

What are the business hours in Ho Chi Minh?

Standard business hours in Ho Chi Minh are 8:00 AM - 5:00 PM ICT.

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 AST timezone?

Major cities in the AST timezone include Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.

What is the UTC offset for AST?

Atlantic Standard Time (AST) is at UTC-04:00. During daylight saving time, it shifts to ADT.

What should I know about the AST timezone?

Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.

When is it midnight in Ho Chi Minh, what time is it in AST?

When it is 12:00 AM (midnight) in Ho Chi Minh (ICT), it is -11h later in AST (AST).

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