Weekmark

Calendar week · ISO 8601

Week 43, 2025

Monday 20 October – Sunday 26 October 2025

  1. Mon20Oct
  2. Tue21Oct
  3. Wed22Oct
  4. Thu23Oct
  5. Fri24Oct
  6. Sat25Oct
  7. Sun26Oct
ISO week
2025-W43
Copy as
CW43 (20–26 Oct)
Quarter
Q4 2025
Weeks in 2025
52
US week number
43

Week 43 is also written KW 43 (Kalenderwoche) or CW 43. 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 20 Oct to Saturday 25 Oct the same number: week 43.