Week 52, 2026
December 21–27, 2026
Monday December 21 – Sunday December 272026-W52Days 355–361
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, Dec 21 | 2026-W52-1 | 355 | 52 | 12 Rajab 1448 AH | |
| Tue, Dec 22 | 2026-W52-2 | 356 | 52 | 13 Rajab 1448 AH | |
| Wed, Dec 23 | 2026-W52-3 | 357 | 52 | 14 Rajab 1448 AH | |
| Thu, Dec 24 | 2026-W52-4 | 358 | 52 | 15 Rajab 1448 AH | Christmas Eve (6pm to midnight) (Australia: Queensland); Christmas Eve |
| Fri, Dec 25 | 2026-W52-5 | 359 | 52 | 16 Rajab 1448 AH | Christmas Day (16 sets) |
| Sat, Dec 26 | 2026-W52-6 | 360 | 52 | 17 Rajab 1448 AH | Boxing Day (5 sets); Saint Stephen's Day (Ireland); Day of Goodwill (South Africa); The first weekday after Christmas Day (Hong Kong) |
| Sun, Dec 27 | 2026-W52-7 | 361 | 53 | 18 Rajab 1448 AH |
About week 52
In US numbering, where weeks start on Sunday and the week of January 1 is week 1, Monday to Saturday are US week 52 and Sunday US week 53.
Holidays this week: Christmas Eve (6pm to midnight) on Thu, Dec 24 in Australia: Queensland; Christmas Day on Fri, Dec 25 in 16 of the countries and regions we cover; Boxing Day on Sat, Dec 26 in 5 of the countries and regions we cover; Saint Stephen's Day on Sat, Dec 26 in Ireland; Day of Goodwill on Sat, Dec 26 in South Africa; The first weekday after Christmas Day on Sat, Dec 26 in Hong Kong. The December solstice is on Mon, Dec 21 at 20:50 UTC. Also this week: Christmas Eve on Thu, Dec 24 (December 24). All weeks of 2026 lists the neighbouring weeks.
Week 52 in other years
| Year | Week 52 runs |
|---|---|
| 2024 | Mon, Dec 23 – Sun, Dec 29 |
| 2025 | Mon, Dec 22 – Sun, Dec 28 |
| 2026 | Mon, Dec 21 – Sun, Dec 27 |
| 2027 | Mon, Dec 27 – Sun, Jan 2, 2028 |
| 2028 | Mon, Dec 25 – Sun, Dec 31 |
| 2029 | Mon, Dec 24 – Sun, Dec 30 |
In 2027, week 52 runs Mon, Dec 27 – Sun, Jan 2: 2026 has 53 weeks, so the same number comes 371 days later, 6 days later in the calendar. Over the 400-year cycle, the Monday of week 52 falls between December 20 and December 27.
By the end of week 52, 361 days of 2026 have passed (98.9% of the year), and 1 ISO week of 2026 remain. The week falls in Q4.
Writing week 52
ISO 8601 writes this week as 2026-W52 (basic format 2026W52), from 2026-W52-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.