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December 2025 calendar

31 days23 weekdaysStarts on MondayISO weeks 49–1

December 2025
WkMonTueWedThuFriSatSun
49
50
51
52
1

‹ November 2025 Calendar 2025 January 2026 ›

December 2025 in numbers

Days
31
Weekdays (Mon–Fri)
23
Weekend days
8
First and last day
Monday – Wednesday
First and last working day
Mon, Dec 1 – Wed, Dec 31
Week numbers
49–1
Day of the year
335–365
Quarter
Q4 2025
Islamic months (computed)
Jumada al-Akhirah – Rajab 1447 AH

With 31 days, December 2025 has four full weeks plus 3 extra days, so Monday, Tuesday and Wednesday occur five times; every other weekday occurs four times. It has 8 weekend days and 23 weekdays.

December 1 is day 335 of the year, so December 2025 covers day numbers 335 to 365. In the Umm al-Qura Islamic calendar, 1 Rajab 1447 AH falls on December 21 (computed; where months begin with the sighting of the new crescent, the start can differ by a day).

Public holidays in December 2025

Computed from each holiday’s legal rule; holidays set by announcement are left out for 2025.

DateHolidayWhere
Mon, Dec 1St Andrew's Day (substitute day)UK: Scotland
Sat, Dec 6Constitution DaySpain
Mon, Dec 8Immaculate ConceptionSpain
Tue, Dec 16Day of ReconciliationSouth Africa
Wed, Dec 24Christmas Eve (6pm to midnight)Australia: Queensland
Thu, Dec 25Christmas DayUnited States (federal), UK: England and Wales, UK: Scotland, UK: Northern Ireland, Canada (federal), Australia (national), Australia: New South Wales, Australia: Queensland, Australia: Western Australia, Ireland, New Zealand, South Africa, Singapore, Hong Kong, France, Spain
Fri, Dec 26Boxing DayUK: England and Wales, UK: Scotland, UK: Northern Ireland, Canada (federal), Australia (national), Australia: New South Wales, Australia: Queensland, Australia: Western Australia, New Zealand
Fri, Dec 26Saint Stephen's DayIreland
Fri, Dec 26Day of GoodwillSouth Africa

National holidays of the 17 sets we take from official government sources; see public holidays by country for regional days and sources. Where a holiday that falls on a weekend moves to a weekday, the table shows the day off.

Other dates in December 2025

Days that many people keep but that are not public holidays in our 17 sets, each from its fixed rule. Jewish dates begin at sunset the evening before; Islamic dates follow the Umm al-Qura calendar and are announced locally.

Clock changes and seasons

Clock changes from IANA tzdata as the rules stand today. Equinox and solstice times are the US Naval Observatory’s, in UTC.

Questions

How many weekdays are in December 2025?
23 weekdays (Monday to Friday) and 8 weekend days, out of 31 days. Public holidays are not subtracted, because they depend on the country; this month has 9 holiday dates in the countries we cover (see the table on this page).
What day does December 2025 start on?
December 2025 starts on Monday, December 1, 2025 and ends on Wednesday, December 31, 2025. The first working day is Mon, Dec 1 and the last is Wed, Dec 31.
What week numbers are in December 2025?
Under ISO 8601 (weeks from Monday) December 2025 spans weeks 49–1 (the last days are already in week 1 of 2026). The week number page explains the rule.
What is the day number of December 1, 2025?
December 1 is day 335 of 2025 and December 31 is day 365, the last day of a common year. In the YYDDD format often called a Julian date, the month runs from 25335 to 25365.
What holidays are in December 2025?
St Andrew's Day (substitute day) (Mon, Dec 1: UK: Scotland); Constitution Day (Sat, Dec 6: Spain); Immaculate Conception (Mon, Dec 8: Spain); Day of Reconciliation (Tue, Dec 16: South Africa); Christmas Eve (6pm to midnight) (Wed, Dec 24: Australia: Queensland); Christmas Day (Thu, Dec 25: 16 of our holiday sets); Boxing Day (Fri, Dec 26: 9 of our holiday sets); Saint Stephen's Day (Fri, Dec 26: Ireland), and 1 more in the table above.

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