Honolulu to Vietnam
+17hHonolulu
HSTSOURCEVietnam
ICTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and ICT on the World Map
The map below highlights the HST (Hawaii Standard Time) and ICT (Indochina Time) timezone regions across the globe.
HST – Hawaii Standard Time
UTC-10:00Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.
- •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).
ICT – Indochina Time
UTC+07:00Indochina Time (ICT) is the time zone for Vietnam, Thailand, Laos, and Cambodia, 7 hours ahead of UTC.
- •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.
About Honolulu
WikipediaHonolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.
Pearl Harbor memorial receives over 2 million visitors annually.
Time Conversion Guide: Honolulu to Vietnam
Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. Vietnam runs on Indochina Time (ICT) at UTC+07:00. That puts Honolulu 17 hours ahead of Vietnam — a difference of +17h at the current offsets.
In practice, when it is 9:00 AM in Honolulu it is 2:00 AM in Vietnam on the next day. Midnight in Honolulu is 5:00 PM in Vietnam. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Honolulu to Vietnam time conversion table
| Honolulu (HST) | Vietnam (ICT) | Day |
|---|---|---|
| 12:00 AM | 5:00 PM | same day |
| 6:00 AM | 11:00 PM | same day |
| 7:00 AM | 12:00 AM | next day |
| 8:00 AM | 1:00 AM | next day |
| 9:00 AM | 2:00 AM | next day |
| 12:00 PM | 5:00 AM | next day |
| 3:00 PM | 8:00 AM | next day |
| 5:00 PM | 10:00 AM | next day |
| 6:00 PM | 11:00 AM | next day |
| 9:00 PM | 2:00 PM | next day |
Why people convert Honolulu to Vietnam time
- Scheduling a call from Honolulu to Vietnam: a 10:00 AM start in Honolulu lands at 3:00 AM in Vietnam the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +17h gap: Honolulu and Vietnam 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 Vietnam is 2:00 AM in Honolulu.
- Watching a live event or market open: Honolulu viewers need 2:00 AM in Vietnam to catch a 9:00 AM start there, and 7:00 AM if the event is anchored to Honolulu.
- Always state the zone abbreviation, not just the hour. "3:00 PM HST" 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 Honolulu takes the early slot, the next week Vietnam does.
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.
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 Honolulu and Vietnam
With a +17h offset there is no overlap inside a normal 9 AM – 5 PM day. Vietnam opens at 9:00 AM ICT, which is 2:00 AM in Honolulu, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Honolulu and Vietnam have no shared working hours because of the +17h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Honolulu is 17 hours ahead of Vietnam (HST UTC-10:00 → ICT UTC+07:00). 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:
Frequently Asked Questions
What is the time difference between Honolulu and Vietnam?
Honolulu (HST, UTC-10:00) is 17 hours ahead of Vietnam (ICT, UTC+07:00). The gap is currently +17h.
How do I convert Honolulu time to Vietnam time?
Add +17h to Honolulu local time. For example, 9:00 AM in Honolulu is 2:00 AM in Vietnam (next day).
What time is it in Vietnam right now?
Vietnam 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 +17h offset from Honolulu.
What is the best time to call Vietnam from Honolulu?
There is no shared working-hours window because of the +17h gap. The closest option is 1:00 PM in Honolulu, which is 6:00 AM in Vietnam.
Which is ahead, Honolulu or Vietnam?
Honolulu is 17 hours ahead of Vietnam. When it is 12:00 PM in Honolulu it is 5:00 AM in Vietnam.
Do Honolulu and Vietnam use different time zones?
Honolulu (USA) uses HST at UTC-10:00, while Vietnam (Vietnam) uses ICT at UTC+07:00. The IANA identifiers are Pacific/Honolulu and Asia/Ho_Chi_Minh.
Does daylight saving time affect the Honolulu–Vietnam difference?
Neither zone observes daylight saving time, so the +17h offset between Honolulu and Vietnam is fixed all year.
Which other cities share Honolulu's time zone?
HST also covers Honolulu, Hilo, Kailua, Pearl City, Kapolei.
Which countries use HST, Honolulu's zone?
HST is used in United States (Hawaii).
Is there a day difference between Honolulu and Vietnam?
Sometimes. The +17h gap is large enough that 8:00 PM or later in Honolulu already falls on the next day in Vietnam.
What is the time difference between Honolulu and Vietnam?
Vietnam is +17h from Honolulu.
What timezone is Honolulu in?
Honolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.
What timezone is Vietnam in?
Vietnam operates on its local timezone.
What are the business hours in Honolulu?
Standard business hours in Honolulu are 8:00 AM - 5:00 PM HST.
Which countries use HST (Hawaii Standard Time)?
HST is used in United States (Hawaii).
Does HST observe daylight saving time?
No, HST does not observe daylight saving time and remains at UTC-10:00 year-round.
What are some interesting 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.
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 Honolulu, what time is it in Vietnam?
When it is 12:00 AM (midnight) in Honolulu (HST), it is +17h later in Vietnam (ICT).
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