Weekmark

Calendar week · ISO 8601

Week 5, 2026

Monday 26 January – Sunday 1 February 2026

  1. Mon26Jan
  2. Tue27Jan
  3. Wed28Jan
  4. Thu29Jan
  5. Fri30Jan
  6. Sat31Jan
  7. Sun1Feb
ISO week
2026-W05
Copy as
CW5 (26 Jan – 1 Feb)
Quarter
Q1 2026
Weeks in 2026
53
US week number
5

Week 5 is also written KW 5 (Kalenderwoche) or CW 5. 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 26 Jan to Saturday 31 Jan the same number: week 5.