As at 2am this Sunday, 7 October, clocks will go forward for everyone in NSW, Victoria, the ACT, Tasmania and South Australia.
That will have the effect of increasing the number of time zones across Australia from three to five, given that Queensland and the Northern Territory fall an hour behind the others states within their time zones.
The change will require businesses trading across state borders to account for the difference.
Daylight saving time will run through until Sunday, 7 April 2019.
As previously noted, the change comes a little differently this year – normally it falls on the long weekend observed by most states at the beginning of October, but the fall of the dates this year means the first Sunday in October fell to the weekend after the long weekend.
NSW, South Australia and the ACT all observe Labour Day on the first Monday in October, while Queensland marks the Queen’s Birthday that day.
The two will overlap once again next year.