Week 40 of 2025
Week 40 of 2025 runs from Monday, September 29, 2025, to Sunday, October 5, 2025. See all seven dates, ISO code and adjacent weeks.
ISO week 40September 29–October 5, 2025Monday through Sunday · 5 weekdays · 2 weekend days
Past
Week 40 at a glance
ISO code2025-W40
Calendar spanSeptember and October
QuarterQ3–Q4 2025
Day of year272–278
Dates in week 40
| Day | Date | Type |
|---|---|---|
| Monday | Weekday | |
| Tuesday | Weekday | |
| Wednesday | Weekday | |
| Thursday | Weekday | |
| Friday | Weekday | |
| Saturday | Weekend | |
| Sunday | Weekend |
About week 40 of 2025
Week 40 of 2025 runs from September 29, 2025 through October 5, 2025. It covers September and October and contains five standard Monday-to-Friday weekdays.
Public holidays are country-specific and are not removed from this basic weekday count. Use the working-days calculator when holidays need to be excluded.