Weekmark

Calendar week · ISO 8601

Week 12, 2026

Monday 16 March – Sunday 22 March 2026

  1. Mon16Mar
  2. Tue17Mar
  3. Wed18Mar
  4. Thu19Mar
  5. Fri20Mar
  6. Sat21Mar
  7. Sun22Mar
ISO week
2026-W12
Copy as
CW12 (16–22 Mar)
Quarter
Q1 2026
Weeks in 2026
53
US week number
12

Week 12 is also written KW 12 (Kalenderwoche) or CW 12. 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 16 Mar to Saturday 21 Mar the same number: week 12.