2025 Week Calendar

All 52 ISO 8601 weeks with Monday-to-Sunday dates

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2025 ISO Week Calendar — All 52 Weeks

The year 2025 has 52 weeks according to the ISO 8601 standard. Below is a complete list of every week with its exact Monday (start) and Sunday (end) dates. Each row links to the full week details page.

Week Monday (Start) Sunday (End)
Week 1 December 30, 2024 January 5, 2025
Week 2 January 6, 2025 January 12, 2025
Week 3 January 13, 2025 January 19, 2025
Week 4 January 20, 2025 January 26, 2025
Week 5 January 27, 2025 February 2, 2025
Week 6 February 3, 2025 February 9, 2025
Week 7 February 10, 2025 February 16, 2025
Week 8 February 17, 2025 February 23, 2025
Week 9 February 24, 2025 March 2, 2025
Week 10 March 3, 2025 March 9, 2025
Week 11 March 10, 2025 March 16, 2025
Week 12 March 17, 2025 March 23, 2025
Week 13 March 24, 2025 March 30, 2025
Week 14 March 31, 2025 April 6, 2025
Week 15 April 7, 2025 April 13, 2025
Week 16 April 14, 2025 April 20, 2025
Week 17 April 21, 2025 April 27, 2025
Week 18 April 28, 2025 May 4, 2025
Week 19 May 5, 2025 May 11, 2025
Week 20 May 12, 2025 May 18, 2025
Week 21 May 19, 2025 May 25, 2025
Week 22 May 26, 2025 June 1, 2025
Week 23 June 2, 2025 June 8, 2025
Week 24 June 9, 2025 June 15, 2025
Week 25 June 16, 2025 June 22, 2025
Week 26 June 23, 2025 June 29, 2025
Week 27 June 30, 2025 July 6, 2025
Week 28 July 7, 2025 July 13, 2025
Week 29 July 14, 2025 July 20, 2025
Week 30 July 21, 2025 July 27, 2025
Week 31 July 28, 2025 August 3, 2025
Week 32 August 4, 2025 August 10, 2025
Week 33 August 11, 2025 August 17, 2025
Week 34 August 18, 2025 August 24, 2025
Week 35 August 25, 2025 August 31, 2025
Week 36 September 1, 2025 September 7, 2025
Week 37 September 8, 2025 September 14, 2025
Week 38 September 15, 2025 September 21, 2025
Week 39 September 22, 2025 September 28, 2025
Week 40 September 29, 2025 October 5, 2025
Week 41 October 6, 2025 October 12, 2025
Week 42 October 13, 2025 October 19, 2025
Week 43 October 20, 2025 October 26, 2025
Week 44 October 27, 2025 November 2, 2025
Week 45 November 3, 2025 November 9, 2025
Week 46 November 10, 2025 November 16, 2025
Week 47 November 17, 2025 November 23, 2025
Week 48 November 24, 2025 November 30, 2025
Week 49 December 1, 2025 December 7, 2025
Week 50 December 8, 2025 December 14, 2025
Week 51 December 15, 2025 December 21, 2025
Week 52 December 22, 2025 December 28, 2025
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❓ Related questions about 2025

What is the week number for January 1, 2025?

January 1, 2025 is in Week 1 of 2025. The ISO week number for Jan 1 depends on which day of the week Jan 1 falls on.

What is the week number for December 31, 2025?

December 31, 2025 is in Week 1 of 2026.

Is 2025 a leap year?

2025 is not a leap year and has 365 days.

❓ Frequently asked questions about 2025

How many weeks are in 2025?

2025 has 52 weeks according to ISO 8601. This is the standard 52-week year length.

What is Week 1 of 2025?

When does Week 1 of 2025 start?

Week 1 of 2025 starts on December 30, 2024 and ends on January 5, 2025.

How is the week number determined for 2025?

ISO 8601 week numbers are determined by the year that contains Thursday. Week 1 of 2025 is the week containing January 4, 2025. Each subsequent week is numbered sequentially.