Weekmark

Calendar week · ISO 8601

Week 50, 2025

Monday 8 December – Sunday 14 December 2025

  1. Mon8Dec
  2. Tue9Dec
  3. Wed10Dec
  4. Thu11Dec
  5. Fri12Dec
  6. Sat13Dec
  7. Sun14Dec
ISO week
2025-W50
Copy as
CW50 (8–14 Dec)
Quarter
Q4 2025
Weeks in 2025
52
US week number
50

Week 50 is also written KW 50 (Kalenderwoche) or CW 50. 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 8 Dec to Saturday 13 Dec the same number: week 50.