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 2029 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.
Traffic volumes, flight bookings and getaway trips peak on Friday afternoons across Australian cities as the working week ends. Friday 28 September 2029 falls on this day of the week, at the close of its standard five-day working stretch, marking the start of the weekend for the standard Monday-to-Friday workforce.
2029 has 365 days on the calendar. Leap years add a single extra day to February, giving those years 366 days instead of 365 and shifting the day-of-year number for every date from March onward by one compared with an ordinary year. This is the only irregularity in the length of the Australian calendar year.