Weekmark

Calendar week · ISO 8601

Week 41, 2026

Monday 5 October – Sunday 11 October 2026

  1. Mon5Oct
  2. Tue6Oct
  3. Wed7Oct
  4. Thu8Oct
  5. Fri9Oct
  6. Sat10Oct
  7. Sun11Oct
ISO week
2026-W41
Copy as
CW41 (5–11 Oct)
Quarter
Q4 2026
Weeks in 2026
53
US week number
41

Week 41 is also written KW 41 (Kalenderwoche) or CW 41. ISO weeks start on Monday, and week 1 is the week with the year’s first Thursday. US calendars start weeks on Sunday and count the week with 1 January as week 1, so they give Monday 5 Oct to Saturday 10 Oct the same number: week 41.