Western Australia marks King's Birthday on the last Monday of September, months after every other state observes the same public holiday name. 28 September 2026 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.
Monday 28 September 2026 is an ordinary working day for the standard Monday-to-Friday workforce and counts toward the working-day total shown above, along with the four days that follow it through to Friday, separate from the shift rosters that retail, hospitality, healthcare and emergency services run on their own patterns.
The quarter containing 28 September 2026 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.
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