Week numbers 2025
2025 has 52 ISO weeks. Week 1 starts Monday 30 December 2024; week 52 ends Sunday 28 December 2025.
ISO 8601 week numbering: weeks run Monday–Sunday, and a week belongs to the year that contains its Thursday — so the first days of January can belong to the last week of the previous year, and vice versa.
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January 31 days · 23 weekdays
Wk
Mo
Tu
We
Th
Fr
Sa
Su
1
30
31
1
2
3
4
5
2
6
7
8
9
10
11
12
3
13
14
15
16
17
18
19
4
20
21
22
23
24
25
26
5
27
28
29
30
31
1
2
February 28 days · 20 weekdays
Wk
Mo
Tu
We
Th
Fr
Sa
Su
5
27
28
29
30
31
1
2
6
3
4
5
6
7
8
9
7
10
11
12
13
14
15
16
8
17
18
19
20
21
22
23
9
24
25
26
27
28
1
2
March 31 days · 21 weekdays
Wk
Mo
Tu
We
Th
Fr
Sa
Su
9
24
25
26
27
28
1
2
10
3
4
5
6
7
8
9
11
10
11
12
13
14
15
16
12
17
18
19
20
21
22
23
13
24
25
26
27
28
29
30
14
31
1
2
3
4
5
6
April 30 days · 22 weekdays
Wk
Mo
Tu
We
Th
Fr
Sa
Su
14
31
1
2
3
4
5
6
15
7
8
9
10
11
12
13
16
14
15
16
17
18
19
20
17
21
22
23
24
25
26
27
18
28
29
30
1
2
3
4
May 31 days · 22 weekdays
Wk
Mo
Tu
We
Th
Fr
Sa
Su
18
28
29
30
1
2
3
4
19
5
6
7
8
9
10
11
20
12
13
14
15
16
17
18
21
19
20
21
22
23
24
25
22
26
27
28
29
30
31
1
June 30 days · 21 weekdays
Wk
Mo
Tu
We
Th
Fr
Sa
Su
22
26
27
28
29
30
31
1
23
2
3
4
5
6
7
8
24
9
10
11
12
13
14
15
25
16
17
18
19
20
21
22
26
23
24
25
26
27
28
29
27
30
1
2
3
4
5
6
July 31 days · 23 weekdays
Wk
Mo
Tu
We
Th
Fr
Sa
Su
27
30
1
2
3
4
5
6
28
7
8
9
10
11
12
13
29
14
15
16
17
18
19
20
30
21
22
23
24
25
26
27
31
28
29
30
31
1
2
3
August 31 days · 21 weekdays
Wk
Mo
Tu
We
Th
Fr
Sa
Su
31
28
29
30
31
1
2
3
32
4
5
6
7
8
9
10
33
11
12
13
14
15
16
17
34
18
19
20
21
22
23
24
35
25
26
27
28
29
30
31
September 30 days · 22 weekdays
Wk
Mo
Tu
We
Th
Fr
Sa
Su
36
1
2
3
4
5
6
7
37
8
9
10
11
12
13
14
38
15
16
17
18
19
20
21
39
22
23
24
25
26
27
28
40
29
30
1
2
3
4
5
October 31 days · 23 weekdays
Wk
Mo
Tu
We
Th
Fr
Sa
Su
40
29
30
1
2
3
4
5
41
6
7
8
9
10
11
12
42
13
14
15
16
17
18
19
43
20
21
22
23
24
25
26
44
27
28
29
30
31
1
2
November 30 days · 20 weekdays
Wk
Mo
Tu
We
Th
Fr
Sa
Su
44
27
28
29
30
31
1
2
45
3
4
5
6
7
8
9
46
10
11
12
13
14
15
16
47
17
18
19
20
21
22
23
48
24
25
26
27
28
29
30
December 31 days · 23 weekdays
Wk
Mo
Tu
We
Th
Fr
Sa
Su
49
1
2
3
4
5
6
7
50
8
9
10
11
12
13
14
51
15
16
17
18
19
20
21
52
22
23
24
25
26
27
28
1
29
30
31
1
2
3
4
All 52 weeks of 2025 as a list with dates
| ISO week | Starts (Monday) | Ends (Sunday) |
|---|---|---|
| Week 1 | 30 December 2024 | 5 January 2025 |
| Week 2 | 6 January 2025 | 12 January 2025 |
| Week 3 | 13 January 2025 | 19 January 2025 |
| Week 4 | 20 January 2025 | 26 January 2025 |
| Week 5 | 27 January 2025 | 2 February 2025 |
| Week 6 | 3 February 2025 | 9 February 2025 |
| Week 7 | 10 February 2025 | 16 February 2025 |
| Week 8 | 17 February 2025 | 23 February 2025 |
| Week 9 | 24 February 2025 | 2 March 2025 |
| Week 10 | 3 March 2025 | 9 March 2025 |
| Week 11 | 10 March 2025 | 16 March 2025 |
| Week 12 | 17 March 2025 | 23 March 2025 |
| Week 13 | 24 March 2025 | 30 March 2025 |
| Week 14 | 31 March 2025 | 6 April 2025 |
| Week 15 | 7 April 2025 | 13 April 2025 |
| Week 16 | 14 April 2025 | 20 April 2025 |
| Week 17 | 21 April 2025 | 27 April 2025 |
| Week 18 | 28 April 2025 | 4 May 2025 |
| Week 19 | 5 May 2025 | 11 May 2025 |
| Week 20 | 12 May 2025 | 18 May 2025 |
| Week 21 | 19 May 2025 | 25 May 2025 |
| Week 22 | 26 May 2025 | 1 June 2025 |
| Week 23 | 2 June 2025 | 8 June 2025 |
| Week 24 | 9 June 2025 | 15 June 2025 |
| Week 25 | 16 June 2025 | 22 June 2025 |
| Week 26 | 23 June 2025 | 29 June 2025 |
| Week 27 | 30 June 2025 | 6 July 2025 |
| Week 28 | 7 July 2025 | 13 July 2025 |
| Week 29 | 14 July 2025 | 20 July 2025 |
| Week 30 | 21 July 2025 | 27 July 2025 |
| Week 31 | 28 July 2025 | 3 August 2025 |
| Week 32 | 4 August 2025 | 10 August 2025 |
| Week 33 | 11 August 2025 | 17 August 2025 |
| Week 34 | 18 August 2025 | 24 August 2025 |
| Week 35 | 25 August 2025 | 31 August 2025 |
| Week 36 | 1 September 2025 | 7 September 2025 |
| Week 37 | 8 September 2025 | 14 September 2025 |
| Week 38 | 15 September 2025 | 21 September 2025 |
| Week 39 | 22 September 2025 | 28 September 2025 |
| Week 40 | 29 September 2025 | 5 October 2025 |
| Week 41 | 6 October 2025 | 12 October 2025 |
| Week 42 | 13 October 2025 | 19 October 2025 |
| Week 43 | 20 October 2025 | 26 October 2025 |
| Week 44 | 27 October 2025 | 2 November 2025 |
| Week 45 | 3 November 2025 | 9 November 2025 |
| Week 46 | 10 November 2025 | 16 November 2025 |
| Week 47 | 17 November 2025 | 23 November 2025 |
| Week 48 | 24 November 2025 | 30 November 2025 |
| Week 49 | 1 December 2025 | 7 December 2025 |
| Week 50 | 8 December 2025 | 14 December 2025 |
| Week 51 | 15 December 2025 | 21 December 2025 |
| Week 52 | 22 December 2025 | 28 December 2025 |