Week 43 of 2025
October 20 – October 26, 2025
| Monday | October 20, 2025 | Mon · week starts |
| Tuesday | October 21, 2025 | |
| Wednesday | October 22, 2025 | |
| Thursday | October 23, 2025 | |
| Friday | October 24, 2025 | |
| Saturday | October 25, 2025 | |
| Sunday | October 26, 2025 | Sun · week ends |
All weeks of 2025
2025 is an ISO year with 52 weeks.
About ISO week 43 of 2025
ISO 8601 weeks start on Monday and end on Sunday. Week 43 of 2025 begins on Monday, October 20, 2025 and ends on Sunday, October 26, 2025. Week numbering follows the international standard: week 1 of a year is the week containing the first Thursday of January, which is why some calendar dates near January 1st belong to the previous or next ISO year.
The ISO week system is the standard for business reporting across Europe and much of the world. The US convention differs: weeks start on Sunday and week 1 contains January 1st, so US week numbers can be one ahead of or behind ISO numbers near year boundaries.
Frequently asked questions
What dates are in week 43 of 2025?
Week 43 of 2025 spans October 20 – October 26, 2025: Monday October 20 through Sunday October 26.
When is week 43 of 2025?
Week 43 of 2025 started 372 days ago, on Monday, October 20, 2025.
Why does 2025 have 52 weeks?
2025 has the usual 52 ISO weeks. Only years starting on a Thursday (or a Wednesday in a leap year) get a 53rd week.