Week Numbers 2026
2026 has 53 numbered weeks under ISO 8601 and 53 under the US convention. Week 1 starts on Monday 29 December 2025 and week 53 ends on Sunday 3 January 2027.
Today in UTC.
Weeks run Monday to Sunday. Week 1 holds the first Thursday.
Week number now
of 53 in 2026 · ISO 8601 numbering
Friday 7 August 2026 is in week 32 of 2026 under ISO 8601 numbering. That week runs from Monday 3 August 2026 to Sunday 9 August 2026.
Both conventions agree on this date: week 32 either way. They part company for most of January and often at the end of December.
Show the working
| Date | 2026-08-07 |
|---|---|
| Weekday | Friday |
| ISO week 1 starts | 2025-12-29 |
| US week 1 starts | 2025-12-28 |
| This week runs | 2026-08-03 to 2026-08-09 |
| Weeks in 2026 | 53 weeks |
Every week of 2026
ISO 8601 weeks, running Monday to Sunday. Week 1 is the week holding the first Thursday of the year, which is why it can start in the previous December. This week is week 32.
| Week | Starts | Ends | ISO dates |
|---|---|---|---|
| Week 1 | 29 December 2025 | 4 January 2026 | 2025-12-29 to 2026-01-04 |
| Week 2 | 5 January 2026 | 11 January 2026 | 2026-01-05 to 2026-01-11 |
| Week 3 | 12 January 2026 | 18 January 2026 | 2026-01-12 to 2026-01-18 |
| Week 4 | 19 January 2026 | 25 January 2026 | 2026-01-19 to 2026-01-25 |
| Week 5 | 26 January 2026 | 1 February 2026 | 2026-01-26 to 2026-02-01 |
| Week 6 | 2 February 2026 | 8 February 2026 | 2026-02-02 to 2026-02-08 |
| Week 7 | 9 February 2026 | 15 February 2026 | 2026-02-09 to 2026-02-15 |
| Week 8 | 16 February 2026 | 22 February 2026 | 2026-02-16 to 2026-02-22 |
| Week 9 | 23 February 2026 | 1 March 2026 | 2026-02-23 to 2026-03-01 |
| Week 10 | 2 March 2026 | 8 March 2026 | 2026-03-02 to 2026-03-08 |
| Week 11 | 9 March 2026 | 15 March 2026 | 2026-03-09 to 2026-03-15 |
| Week 12 | 16 March 2026 | 22 March 2026 | 2026-03-16 to 2026-03-22 |
| Week 13 | 23 March 2026 | 29 March 2026 | 2026-03-23 to 2026-03-29 |
| Week 14 | 30 March 2026 | 5 April 2026 | 2026-03-30 to 2026-04-05 |
| Week 15 | 6 April 2026 | 12 April 2026 | 2026-04-06 to 2026-04-12 |
| Week 16 | 13 April 2026 | 19 April 2026 | 2026-04-13 to 2026-04-19 |
| Week 17 | 20 April 2026 | 26 April 2026 | 2026-04-20 to 2026-04-26 |
| Week 18 | 27 April 2026 | 3 May 2026 | 2026-04-27 to 2026-05-03 |
| Week 19 | 4 May 2026 | 10 May 2026 | 2026-05-04 to 2026-05-10 |
| Week 20 | 11 May 2026 | 17 May 2026 | 2026-05-11 to 2026-05-17 |
| Week 21 | 18 May 2026 | 24 May 2026 | 2026-05-18 to 2026-05-24 |
| Week 22 | 25 May 2026 | 31 May 2026 | 2026-05-25 to 2026-05-31 |
| Week 23 | 1 June 2026 | 7 June 2026 | 2026-06-01 to 2026-06-07 |
| Week 24 | 8 June 2026 | 14 June 2026 | 2026-06-08 to 2026-06-14 |
| Week 25 | 15 June 2026 | 21 June 2026 | 2026-06-15 to 2026-06-21 |
| Week 26 | 22 June 2026 | 28 June 2026 | 2026-06-22 to 2026-06-28 |
| Week 27 | 29 June 2026 | 5 July 2026 | 2026-06-29 to 2026-07-05 |
| Week 28 | 6 July 2026 | 12 July 2026 | 2026-07-06 to 2026-07-12 |
| Week 29 | 13 July 2026 | 19 July 2026 | 2026-07-13 to 2026-07-19 |
| Week 30 | 20 July 2026 | 26 July 2026 | 2026-07-20 to 2026-07-26 |
| Week 31 | 27 July 2026 | 2 August 2026 | 2026-07-27 to 2026-08-02 |
| Week 32 , this week | 3 August 2026 | 9 August 2026 | 2026-08-03 to 2026-08-09 |
| Week 33 | 10 August 2026 | 16 August 2026 | 2026-08-10 to 2026-08-16 |
| Week 34 | 17 August 2026 | 23 August 2026 | 2026-08-17 to 2026-08-23 |
| Week 35 | 24 August 2026 | 30 August 2026 | 2026-08-24 to 2026-08-30 |
| Week 36 | 31 August 2026 | 6 September 2026 | 2026-08-31 to 2026-09-06 |
| Week 37 | 7 September 2026 | 13 September 2026 | 2026-09-07 to 2026-09-13 |
| Week 38 | 14 September 2026 | 20 September 2026 | 2026-09-14 to 2026-09-20 |
| Week 39 | 21 September 2026 | 27 September 2026 | 2026-09-21 to 2026-09-27 |
| Week 40 | 28 September 2026 | 4 October 2026 | 2026-09-28 to 2026-10-04 |
| Week 41 | 5 October 2026 | 11 October 2026 | 2026-10-05 to 2026-10-11 |
| Week 42 | 12 October 2026 | 18 October 2026 | 2026-10-12 to 2026-10-18 |
| Week 43 | 19 October 2026 | 25 October 2026 | 2026-10-19 to 2026-10-25 |
| Week 44 | 26 October 2026 | 1 November 2026 | 2026-10-26 to 2026-11-01 |
| Week 45 | 2 November 2026 | 8 November 2026 | 2026-11-02 to 2026-11-08 |
| Week 46 | 9 November 2026 | 15 November 2026 | 2026-11-09 to 2026-11-15 |
| Week 47 | 16 November 2026 | 22 November 2026 | 2026-11-16 to 2026-11-22 |
| Week 48 | 23 November 2026 | 29 November 2026 | 2026-11-23 to 2026-11-29 |
| Week 49 | 30 November 2026 | 6 December 2026 | 2026-11-30 to 2026-12-06 |
| Week 50 | 7 December 2026 | 13 December 2026 | 2026-12-07 to 2026-12-13 |
| Week 51 | 14 December 2026 | 20 December 2026 | 2026-12-14 to 2026-12-20 |
| Week 52 | 21 December 2026 | 27 December 2026 | 2026-12-21 to 2026-12-27 |
| Week 53 | 28 December 2026 | 3 January 2027 | 2026-12-28 to 2027-01-03 |
2026 at a glance
| ISO 8601 weeks | 53 |
|---|---|
| US weeks | 53 |
| Days in the year | 365 |
| Leap year | No |
| 1 January falls on | Thursday |
| 31 December falls on | Thursday |
Why the first week can start in December
Week 1 of 2026 starts on Monday 29 December 2025. If that date is in December it is not a mistake. ISO 8601 assigns a whole week to the year holding most of its days, so a week straddling New Year belongs to one year or the other rather than being split in half.
The same rule at the other end means the last days of 2026 can fall in week 1 of 2027. Both are correct, and both are shown by the tool above when you enter a date near the boundary.
Frequently asked questions
How many weeks are in 2026?
53 under ISO 8601 numbering, and 53 under the US convention. 2026 is a common year of 365 days, which is 52 weeks and one day over.
When does week 1 of 2026 start?
Monday 29 December 2025 under ISO 8601, which runs Monday to Sunday. Under the US convention it starts on Sunday 28 December 2025. Both can begin in the previous December, which is normal.
Does 2026 have 53 weeks?
Yes, under ISO 8601. A year has 53 numbered weeks when it starts on a Thursday, or on a Wednesday in a leap year. 1 January 2026 is a Thursday.