Weekmark

Calendar week · ISO 8601

Week 41, 2025

Monday 6 October – Sunday 12 October 2025

  1. Mon6Oct
  2. Tue7Oct
  3. Wed8Oct
  4. Thu9Oct
  5. Fri10Oct
  6. Sat11Oct
  7. Sun12Oct
ISO week
2025-W41
Copy as
CW41 (6–12 Oct)
Quarter
Q4 2025
Weeks in 2025
52
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 6 Oct to Saturday 11 Oct the same number: week 41.