HST to HKT
+18hHST
HSTSOURCEHKT
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.
HST vs HKT: Offsets, DST and Best Call Times
HST runs on Hawaii Standard Time (HST) at UTC-10:00. HKT runs on Hong Kong Time (HKT) at UTC+08:00. That puts HST 18 hours ahead of HKT — a difference of +18h at the current offsets.
In practice, when it is 9:00 AM in HST it is 3:00 AM in HKT on the next day. Midnight in HST is 6:00 PM in HKT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
HST to HKT time conversion table
| HST (HST) | HKT (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 HKT time
- Scheduling a call from HST to HKT: a 10:00 AM start in HST lands at 4:00 AM in HKT the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +18h gap: HST and HKT 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 HKT is 3:00 AM in HST.
- Watching a live event or market open: HST viewers need 3:00 AM in HKT to catch a 9:00 AM start there, and 6:00 AM if the event is anchored to HST.
- 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 HKT 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 HKT
With a +18h offset there is no overlap inside a normal 9 AM – 5 PM day. HKT 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 HKT 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 HKT (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 HKT?
HST (HST, UTC-10:00) is 18 hours ahead of HKT (HKT, UTC+08:00). The gap is currently +18h.
How do I convert HST time to HKT time?
Add +18h to HST local time. For example, 9:00 AM in HST is 3:00 AM in HKT (next day).
What time is it in HKT right now?
HKT 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 HKT 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 HKT.
Which is ahead, HST or HKT?
HST is 18 hours ahead of HKT. When it is 12:00 PM in HST it is 6:00 AM in HKT.
Does daylight saving time affect the HST–HKT difference?
Neither zone observes daylight saving time, so the +18h offset between HST and HKT 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 HKT?
Sometimes. The +18h gap is large enough that 8:00 PM or later in HST already falls on the next day in HKT.
What is the time difference between HST and HKT?
HKT is +18h from HST.
What timezone is HST in?
HST operates on its local timezone.
What timezone is HKT in?
HKT operates on its local timezone.
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 HKT?
When it is 12:00 AM (midnight) in HST (HST), it is +18h later in HKT (HKT).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More HST time conversions
- hst to honolulu
- hst to new york
- hst to london
- hst to dubai
- hst to tokyo
- hst to singapore
- hst to sydney
- hst to los angeles
- hst to paris
- hst to delhi
- hst to mumbai
- hst to berlin
- hst to hong kong
- hst to toronto
- hst to kathmandu
- new york to hst
- london to hst
- dubai to hst
- tokyo to hst
- singapore to hst
- sydney to hst
- los angeles to hst
- paris to hst
- delhi to hst
- mumbai to hst
- berlin to hst
- hong kong to hst
- toronto to hst
- kathmandu to hst
See every conversion from HST →·See every conversion from HKT →