ISO Week · 2026 · Q4
Week 52
2026 · –
December · 4 working days · 98% through 2026
Week 52 of 2026 runs December 21, 2026 to December 27, 2026.
Week 52 starts on Monday, December 21, 2026 and ends on Sunday, December 27, 2026. It's the 355th day of the year, sits in Q4, and falls in December. By the end of this week, 361 of 365 days are gone, putting 2026 at 98.9%.
This week includes Christmas Day, so it has 4 working days instead of the usual 5. Need a different week? Browse the full 2026 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 2026, Monday through Sunday, with day-of-year numbers and events.
| Day | Date | Day no. | Type | Events |
|---|---|---|---|---|
| Monday | Day 355 | Weekday | ||
| Tuesday | Day 356 | Weekday | Winter Solstice | |
| Wednesday | Day 357 | Weekday | ||
| Thursday | Day 358 | Weekday | ||
| Friday | Day 359 | Weekday | Christmas Day | |
| Saturday | Day 360 | Weekend | ||
| Sunday | Day 361 | Weekend |
What week 52 of 2026 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 2026, week 52 covers Dec 21 – Dec 27, 2026. That's December, deep in Q4. The same week number shifts by a day or two each year, so week 52 in 2027 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 2026
🇬🇧 United Kingdom
Boxing Day
BankChristmas 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 | view → | ||
| 2025 | Christmas Day | view → | ||
| 2026 THIS YEAR | Christmas Day | |||
| 2027 | New Year's Day | view → | ||
| 2028 | New Year's Day Christmas Day | view → | ||
| 2029 | Christmas Day | view → |
Week 52 of 2026: questions and answers
What days are in week 52 of 2026?
Week 52 of 2026 runs from December 21, 2026 (Monday) through December 27, 2026 (Sunday). It spans December.
What month is week 52 in 2026?
Week 52 of 2026 falls entirely in December 2026.
How many working days are in week 52 of 2026?
Week 52 of 2026 has 4 working days — reduced from 5 due to Christmas Day falling on a weekday.
What week is Christmas Day in 2026?
Christmas Day falls in ISO week 52 of 2026 (Dec 21 – Dec 27, 2026).
What quarter is week 52 of 2026 in?
Week 52 of 2026 is in Q4 (2026). The week starts on day 355 of 365.
What is ISO week 52?
ISO week 52 is defined by the ISO 8601 international standard. It begins on Monday, December 21, 2026, and ends on Sunday, December 27, 2026. It is week 98% through the ISO year 2026.