Father's Day is observed on the first Sunday of September every year, shaping retail trade for the week either side of it. 29 September 2029 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 29 September 2029 falls on this day of the week, inside the weekend itself.
Contracts and legal deadlines that specify calendar days count every day from 29 September 2029 including weekends and public holidays, while deadlines specified in working or business days count only the days this page includes in its working-day total. The difference between the two conventions can shift a deadline by several days once weekends and holidays are counted.