Summer officially begins on 1 December, and by 20 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.
Some employers close early or run a shortened day on Friday, ahead of the weekend that follows. 20 December 2030 falls on this day, the last of the five working days counted in the total shown above for its week, immediately before Saturday and Sunday begin the two-day break most standard working arrangements observe.
The week number shown for 20 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.