Week 52 of 2025
December 22 – December 28, 2025
| Monday | December 22, 2025 | Mon · week starts |
| Tuesday | December 23, 2025 | |
| Wednesday | December 24, 2025 | |
| Thursday | December 25, 2025 | |
| Friday | December 26, 2025 | |
| Saturday | December 27, 2025 | |
| Sunday | December 28, 2025 | Sun · week ends |
All weeks of 2025
2025 is an ISO year with 52 weeks.
About ISO week 52 of 2025
ISO 8601 weeks start on Monday and end on Sunday. Week 52 of 2025 begins on Monday, December 22, 2025 and ends on Sunday, December 28, 2025. Week numbering follows the international standard: week 1 of a year is the week containing the first Thursday of January, which is why some calendar dates near January 1st belong to the previous or next ISO year.
The ISO week system is the standard for business reporting across Europe and much of the world. The US convention differs: weeks start on Sunday and week 1 contains January 1st, so US week numbers can be one ahead of or behind ISO numbers near year boundaries.
Frequently asked questions
What dates are in week 52 of 2025?
Week 52 of 2025 spans December 22 – December 28, 2025: Monday December 22 through Sunday December 28.
When is week 52 of 2025?
Week 52 of 2025 started 309 days ago, on Monday, December 22, 2025.
Why does 2025 have 52 weeks?
2025 has the usual 52 ISO weeks. Only years starting on a Thursday (or a Wednesday in a leap year) get a 53rd week.