Western Australia marks King's Birthday on the last Monday of September, months after every other state observes the same public holiday name. 1 September 2027 carries this public holiday only in Western Australia, with the rest of the country working through an ordinary day under a completely different holiday calendar for the same occasion.
The Ekka public holiday in greater Brisbane is held on a Wednesday during the Royal Queensland Show each August, one of the few recurring public holidays fixed to this day of the week. Wednesday 1 September 2027 falls on the same weekday as this regional observance, which applies only within greater Brisbane and not to the rest of Queensland.
The quarter containing 1 September 2027 is based on the calendar year running January to December, a separate system from the Australian financial year, which runs from 1 July to 30 June and splits into its own four quarters. Businesses often track both systems side by side, one for tax filings and one for calendar-year planning.