Week 42 of 2025
October 13 – October 19, 2025
| Monday | October 13, 2025 | Mon · week starts |
| Tuesday | October 14, 2025 | |
| Wednesday | October 15, 2025 | |
| Thursday | October 16, 2025 | |
| Friday | October 17, 2025 | |
| Saturday | October 18, 2025 | |
| Sunday | October 19, 2025 | Sun · week ends |
All weeks of 2025
2025 is an ISO year with 52 weeks.
About ISO week 42 of 2025
ISO 8601 weeks start on Monday and end on Sunday. Week 42 of 2025 begins on Monday, October 13, 2025 and ends on Sunday, October 19, 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 42 of 2025?
Week 42 of 2025 spans October 13 – October 19, 2025: Monday October 13 through Sunday October 19.
When is week 42 of 2025?
Week 42 of 2025 started 379 days ago, on Monday, October 13, 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.