Time difference between Ireland and Australia
7 hours to 9 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 "Ireland 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 |
|---|---|---|---|
| Dublin | Brisbane | 9 hours ahead | yes — also 10 hours |
| Dublin | Sydney | 9 hours ahead | yes — also 11 hours, 10 hours |
| Dublin | Melbourne | 9 hours ahead | yes — also 11 hours, 10 hours |
| Dublin | Perth | 7 hours ahead | yes — also 8 hours |
When the gap moves
4 of these 4 combinations change by an hour at some point in the year. Dublin goes forward on the last Sunday in March and back on the last Sunday in October; 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 Ireland and Australia?
There is no single figure. Australia spans 4 of the offsets in this data, so the difference runs from 7 hours (Dublin to Perth) to 9 hours (Dublin to Brisbane). Any converter giving one number for this pair has quietly picked a city.
How many hours ahead is Australia of Ireland?
It depends which part of Australia you mean. The table on this page gives every combination; the extremes are 7 hours and 9 hours.
Does the difference between Ireland and Australia change during the year?
Yes. 4 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
Dublin. Ireland is the only country whose summer time is legally the standard and whose winter time is the deviation — Irish Standard Time is UTC+1 and the clocks go *back* to UTC in October. The result is identical to Britain's and the legal description is inverted, which occasionally matters in contracts.
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 Ireland. Australia to Ireland states the same gap the other way round, which is the one to send someone if they are the one doing the travelling.