- Note
- An official national holiday. As Western Australia celebrates Western Australia Day (formerly known as Foundation Day) on the first Monday in June, the governor of Western Australia each year proclaims the day on which the state will observe the King's Birthday, based on school terms and the Perth Royal Show. There is no firm rule to determine this date, though it is usually the last Monday of September or the first Monday of October. Some regional areas of Western Australia celebrate the King's Birthday public holiday on alternative days for locally significant dates or events. [from Wikipedia, 2026]