Summer officially begins on 1 December, and by 10 December 2030 the country runs its hottest, longest-daylight stretch of the year. December closes 2030 in the fourth calendar quarter, the final quarter under the standard January-to-December system used on this page.
Tuesday 10 December 2030 is an ordinary working day in the standard Monday-to-Friday week, sitting in the first half of its week and counting toward the working-day total shown above. It follows the return-to-work adjustment of Monday and precedes the midweek point that Wednesday marks in most Australian workplaces running a standard five-day schedule.
A public holiday that falls on a Monday or a Friday produces a three-day weekend without using any annual leave, which is why long-weekend planning around 10 December 2030 depends on which day of the week the nearest public holiday falls on. A midweek holiday delivers no such automatic extension, though many workers bridge it with a single day of leave.