Week number
Which week of the year it is today under ISO 8601, and the calendar of every week.
Today is week 42 of 2026
Week of 12 October 2026 – 18 October 2026
Under ISO 8601 the week starts on Monday and week 1 is the week containing the first Thursday of the year. That is why a year has 52 or 53 weeks, and why the first days of January can belong to the last week of the previous year.
Every week of 2026
| Week | Period |
|---|---|
| 1 | 29 December – 4 January |
| 2 | 5 January – 11 January |
| 3 | 12 January – 18 January |
| 4 | 19 January – 25 January |
| 5 | 26 January – 1 February |
| 6 | 2 February – 8 February |
| 7 | 9 February – 15 February |
| 8 | 16 February – 22 February |
| 9 | 23 February – 1 March |
| 10 | 2 March – 8 March |
| 11 | 9 March – 15 March |
| 12 | 16 March – 22 March |
| 13 | 23 March – 29 March |
| 14 | 30 March – 5 April |
| 15 | 6 April – 12 April |
| 16 | 13 April – 19 April |
| 17 | 20 April – 26 April |
| 18 | 27 April – 3 May |
| 19 | 4 May – 10 May |
| 20 | 11 May – 17 May |
| 21 | 18 May – 24 May |
| 22 | 25 May – 31 May |
| 23 | 1 June – 7 June |
| 24 | 8 June – 14 June |
| 25 | 15 June – 21 June |
| 26 | 22 June – 28 June |
| 27 | 29 June – 5 July |
| 28 | 6 July – 12 July |
| 29 | 13 July – 19 July |
| 30 | 20 July – 26 July |
| 31 | 27 July – 2 August |
| 32 | 3 August – 9 August |
| 33 | 10 August – 16 August |
| 34 | 17 August – 23 August |
| 35 | 24 August – 30 August |
| 36 | 31 August – 6 September |
| 37 | 7 September – 13 September |
| 38 | 14 September – 20 September |
| 39 | 21 September – 27 September |
| 40 | 28 September – 4 October |
| 41 | 5 October – 11 October |
| 42 | 12 October – 18 October |
| 43 | 19 October – 25 October |
| 44 | 26 October – 1 November |
| 45 | 2 November – 8 November |
| 46 | 9 November – 15 November |
| 47 | 16 November – 22 November |
| 48 | 23 November – 29 November |
| 49 | 30 November – 6 December |
| 50 | 7 December – 13 December |
| 51 | 14 December – 20 December |
| 52 | 21 December – 27 December |
| 53 | 28 December – 3 January |
Every week of 2027
| Week | Period |
|---|---|
| 1 | 4 January – 10 January |
| 2 | 11 January – 17 January |
| 3 | 18 January – 24 January |
| 4 | 25 January – 31 January |
| 5 | 1 February – 7 February |
| 6 | 8 February – 14 February |
| 7 | 15 February – 21 February |
| 8 | 22 February – 28 February |
| 9 | 1 March – 7 March |
| 10 | 8 March – 14 March |
| 11 | 15 March – 21 March |
| 12 | 22 March – 28 March |
| 13 | 29 March – 4 April |
| 14 | 5 April – 11 April |
| 15 | 12 April – 18 April |
| 16 | 19 April – 25 April |
| 17 | 26 April – 2 May |
| 18 | 3 May – 9 May |
| 19 | 10 May – 16 May |
| 20 | 17 May – 23 May |
| 21 | 24 May – 30 May |
| 22 | 31 May – 6 June |
| 23 | 7 June – 13 June |
| 24 | 14 June – 20 June |
| 25 | 21 June – 27 June |
| 26 | 28 June – 4 July |
| 27 | 5 July – 11 July |
| 28 | 12 July – 18 July |
| 29 | 19 July – 25 July |
| 30 | 26 July – 1 August |
| 31 | 2 August – 8 August |
| 32 | 9 August – 15 August |
| 33 | 16 August – 22 August |
| 34 | 23 August – 29 August |
| 35 | 30 August – 5 September |
| 36 | 6 September – 12 September |
| 37 | 13 September – 19 September |
| 38 | 20 September – 26 September |
| 39 | 27 September – 3 October |
| 40 | 4 October – 10 October |
| 41 | 11 October – 17 October |
| 42 | 18 October – 24 October |
| 43 | 25 October – 31 October |
| 44 | 1 November – 7 November |
| 45 | 8 November – 14 November |
| 46 | 15 November – 21 November |
| 47 | 22 November – 28 November |
| 48 | 29 November – 5 December |
| 49 | 6 December – 12 December |
| 50 | 13 December – 19 December |
| 51 | 20 December – 26 December |
| 52 | 27 December – 2 January |