Father's Day is observed on the first Sunday of September every year, shaping retail trade for the week either side of it. 23 September 2028 falls inside the same 30-day month as this observance, in the first month of the Australian spring, as warmer weather returns across the southern half of the country.
A public holiday that falls on a Saturday sits inside the weekend rather than beside it, so it does not automatically create a substitute day off during the working week; whether one applies depends on the specific holiday and the state. Saturday 23 September 2028 falls on this day of the week, inside the weekend itself.
The working-day count on this page excludes both weekend days and any public holiday declared for the state selected, so the same date in 2028 can show a different total depending on which state's calendar applies to 23 September. Interstate businesses need to check more than one state's list before setting a national deadline.