AST to HKT
+12hAST
ASTSOURCEHKT
HKTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and HKT on the World Map
The map below highlights the AST (Atlantic Standard Time) and HKT (Hong Kong Time) timezone regions across the globe.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •Puerto Rico uses AST year-round and does not observe DST.
- •AST is 1 hour ahead of EST.
- •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
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.
AST to HKT Time Difference – Complete Guide
AST runs on Atlantic Standard Time (AST) at UTC-04:00. HKT runs on Hong Kong Time (HKT) at UTC+08:00. That puts AST 12 hours ahead of HKT — a difference of +12h at the current offsets.
In practice, when it is 9:00 AM in AST it is 9:00 PM in HKT. Midnight in AST is 12:00 PM in HKT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to HKT time conversion table
| AST (AST) | HKT (HKT) | Day |
|---|---|---|
| 12:00 AM | 12:00 PM | same day |
| 6:00 AM | 6:00 PM | same day |
| 7:00 AM | 7:00 PM | same day |
| 8:00 AM | 8:00 PM | same day |
| 9:00 AM | 9:00 PM | same day |
| 12:00 PM | 12:00 AM | next day |
| 3:00 PM | 3:00 AM | next day |
| 5:00 PM | 5:00 AM | next day |
| 6:00 PM | 6:00 AM | next day |
| 9:00 PM | 9:00 AM | next day |
Why people convert AST to HKT time
- Scheduling a call from AST to HKT: a 10:00 AM start in AST lands at 10:00 PM in HKT, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +12h gap: AST 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 9:00 PM in AST.
- Booking travel or deliveries: tracking HKT local time against AST keeps pickup windows and arrival estimates honest across the +12h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +12h gap is not.
- With a +12h gap there is no shared 9-to-5 window, so alternate the early start: one week AST takes the early slot, the next week HKT does.
About AST (Atlantic Standard Time)
Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.
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 AST and HKT
With a +12h offset there is no overlap inside a normal 9 AM – 5 PM day. HKT opens at 9:00 AM HKT, which is 9:00 PM in AST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AST and HKT have no shared working hours because of the +12h gap. Teams need to alternate early starts or rely on asynchronous handovers.
AST is 12 hours ahead of HKT (AST UTC-04:00 → 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.
🕐 Daylight Saving Time Info
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
HKT
Does not observe DST
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 AST and HKT?
AST (AST, UTC-04:00) is 12 hours ahead of HKT (HKT, UTC+08:00). The gap is currently +12h.
How do I convert AST time to HKT time?
Add +12h to AST local time. For example, 9:00 AM in AST is 9:00 PM in HKT.
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 +12h offset from AST.
What is the best time to call HKT from AST?
There is no shared working-hours window because of the +12h gap. The closest option is 1:00 PM in AST, which is 1:00 AM in HKT.
Which is ahead, AST or HKT?
AST is 12 hours ahead of HKT. When it is 12:00 PM in AST it is 12:00 AM in HKT.
Does daylight saving time affect the AST–HKT difference?
Neither zone observes daylight saving time, so the +12h offset between AST and HKT is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and HKT?
Sometimes. The +12h gap is large enough that 8:00 PM or later in AST already falls on the next day in HKT.
What is the time difference between AST and HKT?
HKT is +12h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is HKT in?
HKT operates on its local timezone.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
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 AST, what time is it in HKT?
When it is 12:00 AM (midnight) in AST (AST), it is +12h later in HKT (HKT).
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See every conversion from AST →·See every conversion from HKT →