ACST to Hong Kong
-1h 30mACST
ACSTSOURCEHong Kong
HKTGreen rows indicate typical business hours (9 AM - 5 PM)
ACST and HKT on the World Map
The map below highlights the ACST (Australian Central Standard Time) and HKT (Hong Kong Time) timezone regions across the globe.
ACST – Australian Central Standard Time
UTC+09:30Australian Central Standard Time (ACST, UTC+09:30) covers South Australia and the Northern Territory, on a half-hour offset.
- •ACST uses a half-hour offset: UTC+09:30.
- •South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
- •Adelaide and Darwin are 30 minutes apart during daylight saving, level in winter.
- •Adelaide is one of the few major cities on a 30-minute offset.
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: ACST and Hong Kong
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. Hong Kong runs on Hong Kong Standard Time (HKT) at UTC+08:00. That puts ACST 1 hour 30 minutes behind Hong Kong — a difference of -1h 30m at the current offsets.
In practice, when it is 9:00 AM in ACST it is 7:30 AM in Hong Kong. Midnight in ACST is 10:30 PM in Hong Kong. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ACST to Hong Kong time conversion table
| ACST (ACST) | Hong Kong (HKT) | Day |
|---|---|---|
| 12:00 AM | 10:30 PM | previous day |
| 6:00 AM | 4:30 AM | same day |
| 7:00 AM | 5:30 AM | same day |
| 8:00 AM | 6:30 AM | same day |
| 9:00 AM | 7:30 AM | same day |
| 12:00 PM | 10:30 AM | same day |
| 3:00 PM | 1:30 PM | same day |
| 5:00 PM | 3:30 PM | same day |
| 6:00 PM | 4:30 PM | same day |
| 9:00 PM | 7:30 PM | same day |
Why people convert ACST to Hong Kong time
- Scheduling a call from ACST to Hong Kong: a 10:00 AM start in ACST lands at 8:30 AM in Hong Kong, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both ACST and Hong Kong are inside the 9-to-5 working day between 10:30 AM and 5:00 PM ACST time (9:00 AM–3:30 PM HKT). That is roughly 6 hours 30 minutes of usable overlap.
- Coordinating a ACST-based team with Hong Kong contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM ACST" is unambiguous; "3 PM" across a -1h 30m gap is not.
- Block 10:30 AM–5:00 PM ACST as the recurring meeting window if you work primarily from ACST and need Hong Kong colleagues present.
About ACST (Australian Central Standard Time)
Australian Central Standard Time (ACST) is the half-hour offset of UTC+09:30 used across South Australia and the Northern Territory, taking in Adelaide and Darwin. South Australia moves to Australian Central Daylight Time (ACDT, UTC+10:30) from the first Sunday in October to the first Sunday in April, but the Northern Territory does not observe daylight saving — so Adelaide and Darwin sit 30 minutes apart in summer and level with each other in winter. The half-hour offset means Adelaide is 30 minutes behind Sydney in winter and level with it during daylight saving, which regularly catches out travellers and meeting planners.
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 ACST and Hong Kong
Both ACST and Hong Kong sit inside the 9 AM – 5 PM working day between 10:30 AM–5:00 PM ACST, which is 9:00 AM–3:30 PM HKT. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
ACST and Hong Kong share 6 hours of working-hours overlap (10:30 AM–5:00 PM ACST), so scheduling a live meeting is straightforward.
ACST is 1 hour 30 minutes behind Hong Kong (ACST UTC+09:30 → HKT UTC+08:00). The shared working window is 10:30 AM–5:00 PM ACST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
Clocks spring forward on Sat, Oct 3, 2026
Hong Kong
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 ACST and Hong Kong?
ACST (ACST, UTC+09:30) is 1 hour 30 minutes behind Hong Kong (HKT, UTC+08:00). The gap is currently -1h 30m.
How do I convert ACST time to Hong Kong time?
Add -1h 30m to ACST local time. For example, 9:00 AM in ACST is 7:30 AM in Hong Kong.
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 -1h 30m offset from ACST.
What is the best time to call Hong Kong from ACST?
Call between 10:30 AM and 5:00 PM ACST — that maps to 9:00 AM–3:30 PM HKT and keeps both parties inside the working day.
Which is behind, ACST or Hong Kong?
ACST is 1 hour 30 minutes behind Hong Kong. When it is 12:00 PM in ACST it is 10:30 AM in Hong Kong.
Do ACST and Hong Kong use different time zones?
ACST uses ACST at UTC+09:30, while Hong Kong (Hong Kong) uses HKT at UTC+08:00. The IANA identifiers are Australia/Adelaide and Asia/Hong_Kong.
Does daylight saving time affect the ACST–Hong Kong difference?
Neither zone observes daylight saving time, so the -1h 30m offset between ACST and Hong Kong is fixed all year.
Which other cities share ACST's time zone?
ACST also covers Adelaide, Darwin, Alice Springs, Mount Gambier.
Which countries use ACST, ACST's zone?
ACST is used in Australia (South Australia, Northern Territory).
Is there a day difference between ACST and Hong Kong?
Not normally. The -1h 30m gap only pushes the date over the previous day.
What is the time difference between ACST and Hong Kong?
Hong Kong is -1h 30m from ACST.
What timezone is ACST in?
ACST 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 ACST (Australian Central Standard Time)?
ACST is used in Australia (South Australia, Northern Territory).
Does ACST observe daylight saving time?
Yes, ACST switches to ACDT during summer months.
What are some interesting facts about ACST?
ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
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 ACST, what time is it in Hong Kong?
When it is 12:00 AM (midnight) in ACST (ACST), it is -1h 30m later in Hong Kong (HKT).
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See every conversion from ACST →·See every conversion from Hong Kong →