HKT to ACST
+1h 30mHKT
HKTSOURCEACST
ACSTGreen rows indicate typical business hours (9 AM - 5 PM)
HKT and ACST on the World Map
The map below highlights the HKT (Hong Kong Time) and ACST (Australian Central Standard Time) timezone regions across the globe.
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.
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.
Understanding the +1h 30m Gap: HKT vs ACST
HKT runs on Hong Kong Time (HKT) at UTC+08:00. ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. That puts HKT 1 hour 30 minutes ahead of ACST — a difference of +1h 30m at the current offsets.
In practice, when it is 9:00 AM in HKT it is 10:30 AM in ACST. Midnight in HKT is 1:30 AM in ACST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
HKT to ACST time conversion table
| HKT (HKT) | ACST (ACST) | Day |
|---|---|---|
| 12:00 AM | 1:30 AM | same day |
| 6:00 AM | 7:30 AM | same day |
| 7:00 AM | 8:30 AM | same day |
| 8:00 AM | 9:30 AM | same day |
| 9:00 AM | 10:30 AM | same day |
| 12:00 PM | 1:30 PM | same day |
| 3:00 PM | 4:30 PM | same day |
| 5:00 PM | 6:30 PM | same day |
| 6:00 PM | 7:30 PM | same day |
| 9:00 PM | 10:30 PM | same day |
Why people convert HKT to ACST time
- Scheduling a call from HKT to ACST: a 10:00 AM start in HKT lands at 11:30 AM in ACST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both HKT and ACST are inside the 9-to-5 working day between 9:00 AM and 3:30 PM HKT time (10:30 AM–5:00 PM ACST). That is roughly 6 hours 30 minutes of usable overlap.
- Watching a live event or market open: HKT viewers need 10:30 AM in ACST to catch a 9:00 AM start there, and 10:30 PM if the event is anchored to HKT.
- Always state the zone abbreviation, not just the hour. "3:00 PM HKT" is unambiguous; "3 PM" across a +1h 30m gap is not.
- Block 9:00 AM–3:30 PM HKT as the recurring meeting window if you work primarily from HKT and need ACST colleagues present.
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.
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.
Best time to call between HKT and ACST
Both HKT and ACST sit inside the 9 AM – 5 PM working day between 9:00 AM–3:30 PM HKT, which is 10:30 AM–5:00 PM ACST. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
HKT and ACST share 6 hours of working-hours overlap (9:00 AM–3:30 PM HKT), so scheduling a live meeting is straightforward.
HKT is 1 hour 30 minutes ahead of ACST (HKT UTC+08:00 → ACST UTC+09:30). The shared working window is 9:00 AM–3:30 PM HKT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
HKT
Does not observe DST
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
Clocks spring forward on Sat, Oct 3, 2026
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 HKT and ACST?
HKT (HKT, UTC+08:00) is 1 hour 30 minutes ahead of ACST (ACST, UTC+09:30). The gap is currently +1h 30m.
How do I convert HKT time to ACST time?
Add +1h 30m to HKT local time. For example, 9:00 AM in HKT is 10:30 AM in ACST.
What time is it in ACST right now?
ACST uses ACST at UTC+09:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +1h 30m offset from HKT.
What is the best time to call ACST from HKT?
Call between 9:00 AM and 3:30 PM HKT — that maps to 10:30 AM–5:00 PM ACST and keeps both parties inside the working day.
Which is ahead, HKT or ACST?
HKT is 1 hour 30 minutes ahead of ACST. When it is 12:00 PM in HKT it is 1:30 PM in ACST.
Does daylight saving time affect the HKT–ACST difference?
Neither zone observes daylight saving time, so the +1h 30m offset between HKT and ACST is fixed all year.
Which other cities share HKT's time zone?
HKT also covers Hong Kong, Kowloon, Tsuen Wan, Sha Tin.
Which countries use HKT, HKT's zone?
HKT is used in Hong Kong SAR.
Is there a day difference between HKT and ACST?
Not normally. The +1h 30m gap only pushes the date over for late-evening times.
What is the time difference between HKT and ACST?
ACST is +1h 30m from HKT.
What timezone is HKT in?
HKT operates on its local timezone.
What timezone is ACST in?
ACST operates on its local timezone.
Which countries use HKT (Hong Kong Time)?
HKT is used in Hong Kong SAR.
Does HKT observe daylight saving time?
No, HKT does not observe daylight saving time and remains at UTC+08:00 year-round.
What are some interesting facts about HKT?
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.
Which cities are in the ACST timezone?
Major cities in the ACST timezone include Adelaide, Darwin, Alice Springs, Mount Gambier.
What is the UTC offset for ACST?
Australian Central Standard Time (ACST) is at UTC+09:30. During daylight saving time, it shifts to ACDT.
What should I know about the ACST timezone?
ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
When is it midnight in HKT, what time is it in ACST?
When it is 12:00 AM (midnight) in HKT (HKT), it is +1h 30m later in ACST (ACST).
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See every conversion from HKT →·See every conversion from ACST →