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.

Ho Chi Minh to HST

-17h

Ho Chi Minh

ICTSOURCE

Vietnam · UTC+07:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

HST

UTC-10:00

HH07

MM00

(previous day)19:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Ho Chi Minh

HST

12:00 AM

7:00 AM-1

2:00 AM

9:00 AM-1

4:00 AM

11:00 AM-1

6:00 AM

1:00 PM-1

8:00 AM

3:00 PM-1

10:00 AM

5:00 PM-1

12:00 PM

7:00 PM-1

2:00 PM

9:00 PM-1

4:00 PM

11:00 PM-1

6:00 PM

1:00 AM

8:00 PM

3:00 AM

10:00 PM

5:00 AM

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

ICT and HST on the World Map

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

ICT Zone

→

HST 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

HST – Hawaii Standard Time

UTC-10:00

Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.

Countries in HST

United States (Hawaii)

Major Cities in HST

HonoluluHiloKailuaPearl CityKapolei

Key Facts about HST

•Hawaii does not observe daylight saving time.
•HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
•Hawaii is one of only two US states that don't observe DST (the other is Arizona).

Daylight Saving:No – UTC-10:00 year-round

Learn more about HST 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 →

Understanding the -17h Gap: Ho Chi Minh vs HST

Ho Chi Minh runs on Indochina Time (ICT) at UTC+07:00. HST runs on Hawaii Standard Time (HST) at UTC-10:00. That puts Ho Chi Minh 17 hours behind HST — a difference of -17h at the current offsets.

In practice, when it is 9:00 AM in Ho Chi Minh it is 4:00 PM in HST on the previous day. Midnight in Ho Chi Minh is 7:00 AM in HST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Ho Chi Minh to HST time conversion table

Ho Chi Minh (ICT)	HST (HST)	Day
12:00 AM	7:00 AM	previous day
6:00 AM	1:00 PM	previous day
7:00 AM	2:00 PM	previous day
8:00 AM	3:00 PM	previous day
9:00 AM	4:00 PM	previous day
12:00 PM	7:00 PM	previous day
3:00 PM	10:00 PM	previous day
5:00 PM	12:00 AM	same day
6:00 PM	1:00 AM	same day
9:00 PM	4:00 AM	same day

Why people convert Ho Chi Minh to HST time

Scheduling a call from Ho Chi Minh to HST: a 10:00 AM start in Ho Chi Minh lands at 5:00 PM in HST the previous day, so you can confirm the slot without doing the arithmetic yourself.
Handling a -17h gap: Ho Chi Minh and HST 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 HST is 4:00 PM in Ho Chi Minh.
Keeping family and friends in sync: knowing that 8:00 PM in Ho Chi Minh is 3:00 AM in HST 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 -17h gap is not.
With a -17h 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 HST 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 HST (Hawaii Standard Time)

Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.

Best time to call between Ho Chi Minh and HST

With a -17h offset there is no overlap inside a normal 9 AM – 5 PM day. HST opens at 9:00 AM HST, which is 4:00 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 HST have no shared working hours because of the -17h gap. Teams need to alternate early starts or rely on asynchronous handovers.

Ho Chi Minh is 17 hours behind HST (ICT UTC+07:00 → HST UTC-10:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.

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 HST?

Ho Chi Minh (ICT, UTC+07:00) is 17 hours behind HST (HST, UTC-10:00). The gap is currently -17h.

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

Add -17h to Ho Chi Minh local time. For example, 9:00 AM in Ho Chi Minh is 4:00 PM in HST (previous day).

What time is it in HST right now?

HST uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -17h offset from Ho Chi Minh.

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

There is no shared working-hours window because of the -17h gap. The closest option is 1:00 PM in Ho Chi Minh, which is 8:00 PM in HST.

Which is behind, Ho Chi Minh or HST?

Ho Chi Minh is 17 hours behind HST. When it is 12:00 PM in Ho Chi Minh it is 7:00 PM in HST.

Do Ho Chi Minh and HST use different time zones?

Ho Chi Minh (Vietnam) uses ICT at UTC+07:00, while HST uses HST at UTC-10:00. The IANA identifiers are Asia/Ho_Chi_Minh and Pacific/Honolulu.

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

Neither zone observes daylight saving time, so the -17h offset between Ho Chi Minh and HST 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 HST?

Sometimes. The -17h gap is large enough that 8:00 PM or later in Ho Chi Minh already falls on the in HST.

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

HST is -17h 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.