Summer officially begins on 1 December, and by 3 December 2029 the country runs its hottest, longest-daylight stretch of the year. December closes 2029 in the fourth calendar quarter, the final quarter under the standard January-to-December system used on this page.
Monday 3 December 2029 is the first working day of its week. Any bill, deadline or rostered task set for the preceding Saturday or Sunday moves to this date under standard business-day rules, and the working-day count above treats it as day one of a fresh five-day working stretch that runs through to Friday, before the weekend resets the cycle again.
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.