Summer officially begins on 1 December, and by 4 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.
Wednesday 4 December 2030 sits at the midpoint of the standard working week, between Monday's start and Friday's finish. Australians commonly call this point in the week hump day, marking the transition from the first half of the working week to the second, with two working days already complete and two still remaining before the weekend begins.
The week number shown for 4 December 2030 counts full weeks from the start of 2030, a figure used in payroll cycles, rostering and any planning done in weekly or fortnightly blocks rather than by calendar month. Businesses running fortnightly pay runs rely on this figure to track which of the two alternating pay weeks a date falls in.