HST to Hong Kong
+18hHST
HSTSOURCEHong Kong
HKTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and HKT on the World Map
The map below highlights the HST (Hawaii Standard Time) and HKT (Hong Kong 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).
HKT – Hong Kong Time
UTC+08:00Hong Kong Time (HKT, UTC+08:00) is the time zone for Hong Kong, 8 hours ahead of UTC.
- •Hong Kong does not observe daylight saving time and has kept UTC+08:00 since 1979.
- •HKT shares its offset with China Standard Time, Singapore Time and Philippine Time.
- •The Hong Kong Stock Exchange opens at 09:30 HKT.
- •Hong Kong Time does not change with the seasons, so its gap to other zones is fixed.
About Hong Kong
WikipediaHong Kong Time (HKT) is UTC+8 with no daylight saving. As a major financial gateway to China, Hong Kong trading hours overlap with European morning sessions.
The city has one of the world's most efficient and affordable public transit systems.
Comparing Time Zones: HST and Hong Kong
HST runs on Hawaii Standard Time (HST) at UTC-10:00. Hong Kong runs on Hong Kong Standard Time (HKT) at UTC+08:00. That puts HST 18 hours ahead of Hong Kong — a difference of +18h at the current offsets.
In practice, when it is 9:00 AM in HST it is 3:00 AM in Hong Kong on the next day. Midnight in HST is 6:00 PM in Hong Kong. Neither zone observes daylight saving time, so the offset between them stays constant all year.
HST to Hong Kong time conversion table
| HST (HST) | Hong Kong (HKT) | Day |
|---|---|---|
| 12:00 AM | 6:00 PM | same day |
| 6:00 AM | 12:00 AM | next day |
| 7:00 AM | 1:00 AM | next day |
| 8:00 AM | 2:00 AM | next day |
| 9:00 AM | 3:00 AM | next day |
| 12:00 PM | 6:00 AM | next day |
| 3:00 PM | 9:00 AM | next day |
| 5:00 PM | 11:00 AM | next day |
| 6:00 PM | 12:00 PM | next day |
| 9:00 PM | 3:00 PM | next day |
Why people convert HST to Hong Kong time
- Scheduling a call from HST to Hong Kong: a 10:00 AM start in HST lands at 4:00 AM in Hong Kong the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +18h gap: HST and Hong Kong 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 Hong Kong is 3:00 AM in HST.
- Booking travel or deliveries: tracking Hong Kong local time against HST keeps pickup windows and arrival estimates honest across the +18h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM HST" is unambiguous; "3 PM" across a +18h gap is not.
- With a +18h gap there is no shared 9-to-5 window, so alternate the early start: one week HST takes the early slot, the next week Hong Kong 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 HKT (Hong Kong Time)
Hong Kong Time (HKT) is fixed at UTC+08:00 all year and does not observe daylight saving time. Hong Kong last used summer time in 1979 and has kept a single offset since. HKT shares the UTC+08:00 offset with China Standard Time, Singapore Time, Malaysian Time, Philippine Time and Australian Western Standard Time, but is listed separately because Hong Kong maintains its own timekeeping authority. As a major financial centre, Hong Kong's trading hours set the rhythm for markets across Asia, opening at 09:30 HKT which is 01:30 in London and 20:30 the previous evening in New York.
Best time to call between HST and Hong Kong
With a +18h offset there is no overlap inside a normal 9 AM – 5 PM day. Hong Kong opens at 9:00 AM HKT, which is 3:00 AM in HST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
HST and Hong Kong have no shared working hours because of the +18h gap. Teams need to alternate early starts or rely on asynchronous handovers.
HST is 18 hours ahead of Hong Kong (HST UTC-10:00 → HKT UTC+08:00). 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 HST and Hong Kong?
HST (HST, UTC-10:00) is 18 hours ahead of Hong Kong (HKT, UTC+08:00). The gap is currently +18h.
How do I convert HST time to Hong Kong time?
Add +18h to HST local time. For example, 9:00 AM in HST is 3:00 AM in Hong Kong (next day).
What time is it in Hong Kong right now?
Hong Kong uses HKT at UTC+08:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +18h offset from HST.
What is the best time to call Hong Kong from HST?
There is no shared working-hours window because of the +18h gap. The closest option is 1:00 PM in HST, which is 7:00 AM in Hong Kong.
Which is ahead, HST or Hong Kong?
HST is 18 hours ahead of Hong Kong. When it is 12:00 PM in HST it is 6:00 AM in Hong Kong.
Do HST and Hong Kong use different time zones?
HST uses HST at UTC-10:00, while Hong Kong (Hong Kong) uses HKT at UTC+08:00. The IANA identifiers are Pacific/Honolulu and Asia/Hong_Kong.
Does daylight saving time affect the HST–Hong Kong difference?
Neither zone observes daylight saving time, so the +18h offset between HST and Hong Kong is fixed all year.
Which other cities share HST's time zone?
HST also covers Honolulu, Hilo, Kailua, Pearl City, Kapolei.
Which countries use HST, HST's zone?
HST is used in United States (Hawaii).
Is there a day difference between HST and Hong Kong?
Sometimes. The +18h gap is large enough that 8:00 PM or later in HST already falls on the next day in Hong Kong.
What is the time difference between HST and Hong Kong?
Hong Kong is +18h from HST.
What timezone is HST in?
HST operates on its local timezone.
What timezone is Hong Kong in?
Hong Kong Time (HKT) is UTC+8 with no daylight saving. As a major financial gateway to China, Hong Kong trading hours overlap with European morning sessions.
What are the business hours in Hong Kong?
Standard business hours in Hong Kong are 9:00 AM - 6:00 PM HKT.
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 HKT timezone?
Major cities in the HKT timezone include Hong Kong, Kowloon, Tsuen Wan, Sha Tin.
What is the UTC offset for HKT?
Hong Kong Time (HKT) is at UTC+08:00.
What should I know about the HKT timezone?
Hong Kong does not observe daylight saving time and has kept UTC+08:00 since 1979. HKT shares its offset with China Standard Time, Singapore Time and Philippine Time.
When is it midnight in HST, what time is it in Hong Kong?
When it is 12:00 AM (midnight) in HST (HST), it is +18h later in Hong Kong (HKT).
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