Question 1

How many days does December 2025 have?

Accepted Answer

December 2025 has 31 days. It starts on Monday and ends on Wednesday.

Question 2

What ISO week does December 2025 start in?

Accepted Answer

1 December 2025 falls in ISO week 49. Weeks run Monday–Sunday per ISO 8601.

Question 3

Where can I see the public holidays of Japan in December 2025?

Accepted Answer

The calendar on this page marks every national public holiday of Japan in December 2025 in red, with joint/regional days in amber.

12月 2025