Time difference between Hong Kong and Australia
no difference to 2 hours, depending on the city
Why there is no single answer
Australia spans 2 different offsets in this data — Brisbane, Sydney and Melbourne at UTC+10, Perth at UTC+8. One number cannot cover 2 offsets, so any single figure for "Hong Kong to Australia" is a choice of city — declared or not. That is why two sources can both be right and still disagree, and why the useful answer is the table rather than the number.
Every combination
| From | To | Usual difference | Changes in the year |
|---|---|---|---|
| Hong Kong | Brisbane | 2 hours ahead | no |
| Hong Kong | Sydney | 2 hours ahead | yes — also 3 hours |
| Hong Kong | Melbourne | 2 hours ahead | yes — also 3 hours |
| Hong Kong | Perth | no difference | no |
When the gap moves
2 of these 4 combinations change by an hour at some point in the year. Hong Kong, Brisbane and Perth do not change their clocks; Sydney and Melbourne go forward on the first Sunday in October and back on the first Sunday in April. Where the two sides change on different weekends, there is a stretch of days when the difference is what neither party expects.
Frequently asked questions
What is the time difference between Hong Kong and Australia?
There is no single figure. Australia spans 4 of the offsets in this data, so the difference runs from no difference (Hong Kong to Perth) to 2 hours (Hong Kong to Brisbane). Any converter giving one number for this pair has quietly picked a city.
How many hours ahead is Australia of Hong Kong?
It depends which part of Australia you mean. The table on this page gives every combination; the extremes are no difference and 2 hours.
Does the difference between Hong Kong and Australia change during the year?
Yes. 2 of the 4 city combinations here shift by an hour at some point, because the two sides change their clocks on different weekends or one of them does not change at all.
About these places
Hong Kong. Hong Kong is UTC+8 all year and has been since 1979, when it dropped a summer-time arrangement that had run intermittently since the 1940s. It shares the offset with mainland China, which simplifies a great deal.
Brisbane. Brisbane is UTC+10 and does not change its clocks, while Sydney and Melbourne — the same offset in winter — go an hour ahead in October. For half the year Queensland is an hour behind its southern neighbours, which is a standing annoyance for anyone scheduling across the east coast.
Sydney. Sydney is UTC+10 in winter and UTC+11 from October to April. Its summer is the northern hemisphere's winter, so the gap to Europe and North America swings by two hours over the year rather than staying put.
Melbourne. Melbourne keeps the same clock as Sydney, UTC+10 in winter and UTC+11 in summer, and changes on the same dates. The pair are the reason "Australian Eastern Time" needs the Standard or Daylight qualifier to mean anything between October and April.
Perth. Perth is UTC+8, the same as Singapore and Beijing, and is the only Australian capital that does not change its clocks. Western Australia has rejected daylight saving in four referendums, most recently in 2009.
The same pair from the other end
This page reads the difference as Australia against Hong Kong. Australia to Hong Kong states the same gap the other way round, which is the one to send someone if they are the one doing the travelling.