Weekmark

Calendar week · ISO 8601

Week 42, 2027

Monday 18 October – Sunday 24 October 2027

  1. Mon18Oct
  2. Tue19Oct
  3. Wed20Oct
  4. Thu21Oct
  5. Fri22Oct
  6. Sat23Oct
  7. Sun24Oct
ISO week
2027-W42
Copy as
CW42 (18–24 Oct)
Quarter
Q4 2027
Weeks in 2027
52
US week number
43

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 18 Oct to Saturday 23 Oct a different number: week 43.