ICT to Honolulu
-17hICT
ICTSOURCEHonolulu
HSTGreen 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 – 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.
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).
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.
ICT vs Honolulu: Offsets, DST and Best Call Times
ICT runs on Indochina Time (ICT) at UTC+07:00. Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. That puts ICT 17 hours behind Honolulu — a difference of -17h at the current offsets.
In practice, when it is 9:00 AM in ICT it is 4:00 PM in Honolulu on the previous day. Midnight in ICT is 7:00 AM in Honolulu. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ICT to Honolulu time conversion table
| ICT (ICT) | Honolulu (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 ICT to Honolulu time
- Scheduling a call from ICT to Honolulu: a 10:00 AM start in ICT lands at 5:00 PM in Honolulu the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -17h gap: ICT and Honolulu 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 Honolulu is 4:00 PM in ICT.
- Keeping family and friends in sync: knowing that 8:00 PM in ICT is 3:00 AM in Honolulu 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 ICT takes the early slot, the next week Honolulu 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 ICT and Honolulu
With a -17h offset there is no overlap inside a normal 9 AM – 5 PM day. Honolulu opens at 9:00 AM HST, which is 4:00 PM in ICT, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
ICT and Honolulu have no shared working hours because of the -17h gap. Teams need to alternate early starts or rely on asynchronous handovers.
ICT is 17 hours behind Honolulu (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:
Frequently Asked Questions
What is the time difference between ICT and Honolulu?
ICT (ICT, UTC+07:00) is 17 hours behind Honolulu (HST, UTC-10:00). The gap is currently -17h.
How do I convert ICT time to Honolulu time?
Add -17h to ICT local time. For example, 9:00 AM in ICT is 4:00 PM in Honolulu (previous day).
What time is it in Honolulu right now?
Honolulu 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 ICT.
What is the best time to call Honolulu from ICT?
There is no shared working-hours window because of the -17h gap. The closest option is 1:00 PM in ICT, which is 8:00 PM in Honolulu.
Which is behind, ICT or Honolulu?
ICT is 17 hours behind Honolulu. When it is 12:00 PM in ICT it is 7:00 PM in Honolulu.
Do ICT and Honolulu use different time zones?
ICT uses ICT at UTC+07:00, while Honolulu (USA) uses HST at UTC-10:00. The IANA identifiers are Asia/Bangkok and Pacific/Honolulu.
Does daylight saving time affect the ICT–Honolulu difference?
Neither zone observes daylight saving time, so the -17h offset between ICT and Honolulu is fixed all year.
Which other cities share ICT's time zone?
ICT also covers Bangkok, Ho Chi Minh City, Hanoi, Jakarta, Phnom Penh, Vientiane.
Which countries use ICT, ICT's zone?
ICT is used in Thailand, Vietnam, Cambodia, Laos, Indonesia (WIB).
Is there a day difference between ICT and Honolulu?
Sometimes. The -17h gap is large enough that 8:00 PM or later in ICT already falls on the in Honolulu.
What is the time difference between ICT and Honolulu?
Honolulu is -17h from ICT.
What timezone is ICT in?
ICT operates on its local timezone.
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 are the business hours in Honolulu?
Standard business hours in Honolulu are 8:00 AM - 5:00 PM HST.
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 HST timezone?
Major cities in the HST timezone include Honolulu, Hilo, Kailua, Pearl City, Kapolei.
What is the UTC offset for HST?
Hawaii Standard Time (HST) is at UTC-10:00.
What should I know about the HST timezone?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
When is it midnight in ICT, what time is it in Honolulu?
When it is 12:00 AM (midnight) in ICT (ICT), it is -17h later in Honolulu (HST).
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