Week 42, 2026

1. Mon12Oct
2. Tue13Oct
3. Wed14Oct
4. Thu15Oct
5. Fri16Oct
6. Sat17Oct
7. Sun18Oct

ISO week

2026-W42

Copy as

CW42 (12–18 Oct)

Quarter

Q4 2026

Weeks in 2026

53

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 12 Oct to Saturday 17 Oct the same number: week 42.