King's Birthday falls on the second Monday of June in New South Wales, Victoria, South Australia, Tasmania, the Northern Territory and the ACT. Western Australia and Queensland do not observe the holiday on this date, so 25 June 2026 carries the public holiday in six jurisdictions and not in the other two, one of the clearest state-by-state splits on the calendar.
Thursday sits one working day ahead of the weekend, making it the point in the week where plans for Friday, Saturday and Sunday commonly get finalised. 25 June 2026 falls on this day of the week, the second-to-last working day before the standard Monday-to-Friday week comes to a close and the weekend takes over.
2026 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.