Summer officially begins on 1 December, and by 4 December 2028 the country runs its hottest, longest-daylight stretch of the year. December closes 2028 in the fourth calendar quarter, the final quarter under the standard January-to-December system used on this page.
The week containing Monday 4 December 2028 is counted from this date under the standard week-numbering convention used on this page, with weeks running Monday to Sunday rather than Sunday to Saturday. This convention affects rostering, payroll cycles and any planning done in weekly blocks across Australian workplaces that pay staff or schedule shifts on a weekly basis.
2028 has 366 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.