Weekmark

Calendar week · ISO 8601

Week 52, 2025

Monday 22 December – Sunday 28 December 2025

  1. Mon22Dec
  2. Tue23Dec
  3. Wed24Dec
  4. Thu25Dec
  5. Fri26Dec
  6. Sat27Dec
  7. Sun28Dec
ISO week
2025-W52
Copy as
CW52 (22–28 Dec)
Quarter
Q4 2025
Weeks in 2025
52
US week number
52

Week 52 is also written KW 52 (Kalenderwoche) or CW 52. 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 22 Dec to Saturday 27 Dec the same number: week 52.