Weekmark

Calendar week · ISO 8601

Week 31, 2025

Monday 28 July – Sunday 3 August 2025

  1. Mon28Jul
  2. Tue29Jul
  3. Wed30Jul
  4. Thu31Jul
  5. Fri1Aug
  6. Sat2Aug
  7. Sun3Aug
ISO week
2025-W31
Copy as
CW31 (28 Jul – 3 Aug)
Quarter
Q3 2025
Weeks in 2025
52
US week number
31

Week 31 is also written KW 31 (Kalenderwoche) or CW 31. 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 Jul to Saturday 2 Aug the same number: week 31.