ISO Week · 2025 · Q4
Week 52
2025 · –
December · 3 working days · 100% through 2025
Week 52 of 2025 runs December 22, 2025 to December 28, 2025.
Week 52 starts on Monday, December 22, 2025 and ends on Sunday, December 28, 2025. It's the 356th day of the year, sits in Q4, and falls in December. By the end of this week, 362 of 365 days are gone, putting 2025 at 99.2%.
This week includes Christmas Day, New Year's Eve, Boxing Day, so it has 3 working days instead of the usual 5. Need a different week? Browse the full 2025 week calendar, or jump to this week's number.
Week 52 at a glance
The 7 days of week 52
Every date in week 52 of 2025, Monday through Sunday, with day-of-year numbers and events.
| Day | Date | Day no. | Type | Events |
|---|---|---|---|---|
| Monday | Day 356 | Weekday | ||
| Tuesday | Day 357 | Weekday | ||
| Wednesday | Day 358 | Weekday | ||
| Thursday | Day 359 | Weekday | Christmas Day | |
| Friday | Day 360 | Weekday | Boxing Day | |
| Saturday | Day 361 | Weekend | ||
| Sunday | Day 362 | Weekend |
What week 52 of 2025 means
ISO 8601 numbers weeks so every week starts on Monday and ends on Sunday. Week 1 is the one holding the year's first Thursday, which is why early January can land in week 52 or 53 of the previous year. Week 52 is one piece of that system.
In 2025, week 52 covers Dec 22 – Dec 28, 2025. That's December, deep in Q4. The same week number shifts by a day or two each year, so week 52 in 2026 won't share these exact dates. The table below shows how it moves.
Want to check a specific date instead of a week number? The week calculator converts any date to its ISO week. Curious how many weeks a year holds? The weeks in a year guide explains 52 versus 53. And the ISO week number page covers the standard end to end.
Holidays in week 52 of 2025
🇬🇧 United Kingdom
Boxing Day
BankChristmas Bank Holiday
BankBoxing Day Bank Holiday
Bank🇦🇺 Australia
Boxing Day
NationalWeek 52 across years
The same ISO week number lands on different dates each year. Here's how week 52 shifts.
| Year | From (Mon) | To (Sun) | Notable | |
|---|---|---|---|---|
| 2024 | Christmas Day Boxing Day | view → | ||
| 2025 THIS YEAR | Christmas Day Boxing Day | |||
| 2026 | Christmas Day Boxing Day | view → | ||
| 2027 | New Year's Day | view → | ||
| 2028 | New Year's Day Christmas Day | view → |
Week 52 of 2025: questions and answers
What days are in week 52 of 2025?
Week 52 of 2025 runs from December 22, 2025 (Monday) through December 28, 2025 (Sunday). It spans December.
What month is week 52 in 2025?
Week 52 of 2025 falls entirely in December 2025.
How many working days are in week 52 of 2025?
Week 52 of 2025 has 3 working days — reduced from 5 due to Christmas Day, Boxing Day falling on a weekday.
What week is Christmas Day in 2025?
Christmas Day falls in ISO week 52 of 2025 (Dec 22 – Dec 28, 2025).
What quarter is week 52 of 2025 in?
Week 52 of 2025 is in Q4 (2025). The week starts on day 356 of 365.
What is ISO week 52?
ISO week 52 is defined by the ISO 8601 international standard. It begins on Monday, December 22, 2025, and ends on Sunday, December 28, 2025. It is week 100% through the ISO year 2025.