Weekmark

Calendar week · ISO 8601

Week 12, 2025

Monday 17 March – Sunday 23 March 2025

  1. Mon17Mar
  2. Tue18Mar
  3. Wed19Mar
  4. Thu20Mar
  5. Fri21Mar
  6. Sat22Mar
  7. Sun23Mar
ISO week
2025-W12
Copy as
CW12 (17–23 Mar)
Quarter
Q1 2025
Weeks in 2025
52
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 17 Mar to Saturday 22 Mar the same number: week 12.