December is the busiest trading month of the year for retail and hospitality, with Christmas shopping and the summer sales season running through most of the 31-day month. 9 December 2029 falls inside this peak trading period, in the run-up to the two fixed public holidays that close out the year.
A public holiday that falls on a Sunday sits inside the weekend rather than beside it, and whether a substitute day off applies to the following Monday depends on the specific holiday and the state. Sunday 9 December 2029 falls on this day of the week, at the close of the weekend, immediately before the working week resumes.
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.