Western Australia marks King's Birthday on the last Monday of September, months after every other state observes the same public holiday name. 5 September 2028 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.
Tuesday 5 September 2028 is an ordinary working day in the standard Monday-to-Friday week, sitting in the first half of its week and counting toward the working-day total shown above. It follows the return-to-work adjustment of Monday and precedes the midweek point that Wednesday marks in most Australian workplaces running a standard five-day schedule.
Contracts and legal deadlines that specify calendar days count every day from 5 September 2028 including weekends and public holidays, while deadlines specified in working or business days count only the days this page includes in its working-day total. The difference between the two conventions can shift a deadline by several days once weekends and holidays are counted.