Weekmark

Calendar week · ISO 8601

Week 52, 2026

Monday 21 December – Sunday 27 December 2026

  1. Mon21Dec
  2. Tue22Dec
  3. Wed23Dec
  4. Thu24Dec
  5. Fri25Dec
  6. Sat26Dec
  7. Sun27Dec
ISO week
2026-W52
Copy as
CW52 (21–27 Dec)
Quarter
Q4 2026
Weeks in 2026
53
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 21 Dec to Saturday 26 Dec the same number: week 52.