Weekmark

Calendar week · ISO 8601

Week 42, 2025

Monday 13 October – Sunday 19 October 2025

  1. Mon13Oct
  2. Tue14Oct
  3. Wed15Oct
  4. Thu16Oct
  5. Fri17Oct
  6. Sat18Oct
  7. Sun19Oct
ISO week
2025-W42
Copy as
CW42 (13–19 Oct)
Quarter
Q4 2025
Weeks in 2025
52
US week number
42

Week 42 is also written KW 42 (Kalenderwoche) or CW 42. 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 13 Oct to Saturday 18 Oct the same number: week 42.