Summer officially begins on 1 December, and by 27 December 2026 the country runs its hottest, longest-daylight stretch of the year. December closes 2026 in the fourth calendar quarter, the final quarter under the standard January-to-December system used on this page.
Sunday 27 December 2026 is a weekend day under the standard Monday-to-Friday working pattern and does not count toward the working-day total shown above, the last day of the weekend before the working week resumes on Monday morning across most Australian workplaces and schools.
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 2026 can show a different total depending on which state's calendar applies to 27 December. Interstate businesses need to check more than one state's list before setting a national deadline.