The AFL finals series runs through most of September, culminating in the Grand Final at the very end of the month or the start of October. 23 September 2029 falls inside this finals fixture list, alongside the NRL finals running on a similar schedule, with both codes crowning premiers within weeks of each other.
Any deadline or bill payment due on Sunday 23 September 2029 moves to the following Monday under standard business-day rules, since Sunday sits outside the working week this page counts by default. This convention applies consistently across contracts, invoices and statutory deadlines throughout Australia, regardless of which state or territory is involved.
2029 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.