Weekmark

Calendar week · ISO 8601

Week 43, 2026

Monday 19 October – Sunday 25 October 2026

  1. Mon19Oct
  2. Tue20Oct
  3. Wed21Oct
  4. Thu22Oct
  5. Fri23Oct
  6. Sat24Oct
  7. Sun25Oct
ISO week
2026-W43
Copy as
CW43 (19–25 Oct)
Quarter
Q4 2026
Weeks in 2026
53
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 19 Oct to Saturday 24 Oct the same number: week 43.