Summer officially begins on 1 December, and by 10 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.
The week containing Monday 10 December 2029 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.
The working-day count on this page excludes both weekend days and any public holiday declared for the state selected, so the same date in 2029 can show a different total depending on which state's calendar applies to 10 December. Interstate businesses need to check more than one state's list before setting a national deadline.