Weekmark

Calendar week · ISO 8601

Week 18, 2025

Monday 28 April – Sunday 4 May 2025

  1. Mon28Apr
  2. Tue29Apr
  3. Wed30Apr
  4. Thu1May
  5. Fri2May
  6. Sat3May
  7. Sun4May
ISO week
2025-W18
Copy as
CW18 (28 Apr – 4 May)
Quarter
Q2 2025
Weeks in 2025
52
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 28 Apr to Saturday 3 May the same number: week 18.