September 28 – October 4, 2026 · 2026-W40 · ~74% through 2026
Week Details
| Week number | 40 |
| Year | 2026 |
| ISO notation | 2026-W40 |
| Start date | Monday, September 28, 2026 |
| End date | Sunday, October 4, 2026 |
| Working days | 5 (Mon–Fri) |
| Year progress | 74% |
Days in This Week
Mon Today
Sep 28 Tue Today
Sep 29 Wed Today
Sep 30 Thu Today
Oct 1 Fri Today
Oct 2 Sat Today
Oct 3 Sun Today
Oct 4 All Weeks of 2026
Week 40 in Other Years
| Year | Start | End |
|---|---|---|
| 2027 | Oct 4, 2027 | Oct 10, 2027 |
Frequently Asked Questions
What dates are in week 40 of 2026?
Week 40 of 2026 starts on Monday, September 28, 2026 and ends on Sunday, October 4, 2026. It contains 5 working days (Monday–Friday) and a 2-day weekend (Saturday–Sunday).
What is the ISO notation for week 40, 2026?
The ISO 8601 week date notation is 2026-W40. Individual days are written as 2026-W40-1 (Monday) through 2026-W40-7 (Sunday).
How far through 2026 is week 40?
Week 40 begins around day 271 of 365, which is approximately 74% through the year.