Weekmark

Calendar week · ISO 8601

Week 3, 2026

Monday 12 January – Sunday 18 January 2026

  1. Mon12Jan
  2. Tue13Jan
  3. Wed14Jan
  4. Thu15Jan
  5. Fri16Jan
  6. Sat17Jan
  7. Sun18Jan
ISO week
2026-W03
Copy as
CW3 (12–18 Jan)
Quarter
Q1 2026
Weeks in 2026
53
US week number
3

Week 3 is also written KW 3 (Kalenderwoche) or CW 3. 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 12 Jan to Saturday 17 Jan the same number: week 3.