Father's Day is observed on the first Sunday of September every year, shaping retail trade for the week either side of it. 14 September 2026 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 landing on a Monday produces a three-day weekend together with the preceding Saturday and Sunday, one of the two most common long-weekend patterns on the Australian calendar. Monday 14 September 2026 falls on this day of the week, at the start of a standard five-day working stretch that runs through to Friday of the same week.
Contracts and legal deadlines that specify calendar days count every day from 14 September 2026 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.
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