Weekmark

Calendar week · ISO 8601

Week 20, 2025

Monday 12 May – Sunday 18 May 2025

  1. Mon12May
  2. Tue13May
  3. Wed14May
  4. Thu15May
  5. Fri16May
  6. Sat17May
  7. Sun18May
ISO week
2025-W20
Copy as
CW20 (12–18 May)
Quarter
Q2 2025
Weeks in 2025
52
US week number
20

Week 20 is also written KW 20 (Kalenderwoche) or CW 20. 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 May to Saturday 17 May the same number: week 20.