Week 18, 2026

1. Mon27Apr
2. Tue28Apr
3. Wed29Apr
4. Thu30Apr
5. Fri1May
6. Sat2May
7. Sun3May

ISO week

2026-W18

Copy as

CW18 (27 Apr – 3 May)

Quarter

Q2 2026

Weeks in 2026

53

US week number

18

Week 18 is also written KW 18 (Kalenderwoche) or CW 18. 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 27 Apr to Saturday 2 May the same number: week 18.