Convert HKT to ACST
ACST is 1 hour 30 minutes ahead of HKT. HKT is UTC+8 and ACST is UTC+9:30.
Right now: HKT · ACST
Best time to schedule a meeting
Standard 9–5 working hours overlap for 7 hours: 9:00 AM–4:00 PM HKT (10:00 AM–5:00 PM ACST). Schedule meetings inside that window.
| HKT | ACST | Suitable? |
|---|---|---|
| 9:00 AM | 10:30 AM | working hours |
| 10:00 AM | 11:30 AM | working hours |
| 11:00 AM | 12:30 PM | working hours |
| 12:00 PM | 1:30 PM | working hours |
| 1:00 PM | 2:30 PM | working hours |
| 2:00 PM | 3:30 PM | working hours |
| 3:00 PM | 4:30 PM | working hours |
| 4:00 PM | 5:30 PM | outside 9–5 |
| 5:00 PM | 6:30 PM | outside 9–5 |
HKT to ACST conversion table
| HKT | ACST |
|---|---|
| 12:00 AM | 1:30 AM |
| 1:00 AM | 2:30 AM |
| 2:00 AM | 3:30 AM |
| 3:00 AM | 4:30 AM |
| 4:00 AM | 5:30 AM |
| 5:00 AM | 6:30 AM |
| 6:00 AM | 7:30 AM |
| 7:00 AM | 8:30 AM |
| 8:00 AM | 9:30 AM |
| 9:00 AM | 10:30 AM |
| 10:00 AM | 11:30 AM |
| 11:00 AM | 12:30 PM |
| 12:00 PM | 1:30 PM |
| 1:00 PM | 2:30 PM |
| 2:00 PM | 3:30 PM |
| 3:00 PM | 4:30 PM |
| 4:00 PM | 5:30 PM |
| 5:00 PM | 6:30 PM |
| 6:00 PM | 7:30 PM |
| 7:00 PM | 8:30 PM |
| 8:00 PM | 9:30 PM |
| 9:00 PM | 10:30 PM |
| 10:00 PM | 11:30 PM |
| 11:00 PM | 12:30 AM (next day) |
About HKT
Hong Kong Time (HKT) is UTC+8. It is used in Hong Kong, and matching mainland China and Taiwan.
Hong Kong Time is UTC+8 and has had no daylight saving since 1979. It shares its offset with mainland China, Singapore, Taiwan, Manila and Perth, which makes UTC+8 the most economically dense single offset in the world — roughly a fifth of the planet's population runs on it, and a meeting scheduled in it reaches an unusual amount of Asia at once.
About ACST
Australian Central Standard Time (ACST) is UTC+9:30. It is used in Adelaide and Darwin in winter.
Australian Central Standard Time is UTC+9:30, half an hour behind the eastern states rather than a whole hour, which surprises people every time. South Australia moves to daylight saving in October and the Northern Territory does not, so Adelaide and Darwin share this offset for half the year and are an hour apart for the other half.
Does this gap change with the seasons?
Neither HKT nor ACST shifts with the seasons, so this 1.5-hour difference holds all year. That is unusual enough to be worth relying on: most cross-continental gaps move twice a year.
This is the reason scheduling systems store an IANA zone such as Region/City rather than an offset or an abbreviation: the zone knows its own rules and the offset does not.
Frequently asked questions
What time is 9:00 AM HKT in ACST?
9:00 AM HKT is 10:30 AM ACST.
Is ACST ahead of HKT?
ACST is 1 hour 30 minutes ahead of HKT.
Which time zone does this use?
HKT is UTC+8 and ACST is UTC+9:30. Both abbreviations denote a single fixed offset, so this conversion never shifts with daylight saving — what changes is which abbreviation a place is using at the time.