Weekmark

Calendar week · ISO 8601

Week 53, 2026

Monday 28 December 2026 – Sunday 3 January 2027

  1. Mon28Dec
  2. Tue29Dec
  3. Wed30Dec
  4. Thu31Dec
  5. Fri1Jan
  6. Sat2Jan
  7. Sun3Jan
ISO week
2026-W53
Copy as
CW53 (28 Dec – 3 Jan)
Quarter
Q4 2026
Weeks in 2026
53
US week number
1 of 2027

Week 53 is also written KW 53 (Kalenderwoche) or CW 53. 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 Dec to Saturday 2 Jan a different number: week 1 of 2027.