Western Australia marks King's Birthday on the last Monday of September, months after every other state observes the same public holiday name. 2 September 2030 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.
A public holiday landing on a Monday produces a three-day weekend together with the preceding Saturday and Sunday, one of the two most common long-weekend patterns on the Australian calendar. Monday 2 September 2030 falls on this day of the week, at the start of a standard five-day working stretch that runs through to Friday of the same week.
A public holiday that falls on a Monday or a Friday produces a three-day weekend without using any annual leave, which is why long-weekend planning around 2 September 2030 depends on which day of the week the nearest public holiday falls on. A midweek holiday delivers no such automatic extension, though many workers bridge it with a single day of leave.