Weekmark

Calendar week · ISO 8601

Week 51, 2027

Monday 20 December – Sunday 26 December 2027

  1. Mon20Dec
  2. Tue21Dec
  3. Wed22Dec
  4. Thu23Dec
  5. Fri24Dec
  6. Sat25Dec
  7. Sun26Dec
ISO week
2027-W51
Copy as
CW51 (20–26 Dec)
Quarter
Q4 2027
Weeks in 2027
52
US week number
52

Week 51 is also written KW 51 (Kalenderwoche) or CW 51. 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 20 Dec to Saturday 25 Dec a different number: week 52.