Week 13, 2026

1. Mon23Mar
2. Tue24Mar
3. Wed25Mar
4. Thu26Mar
5. Fri27Mar
6. Sat28Mar
7. Sun29Mar

ISO week

2026-W13

Copy as

CW13 (23–29 Mar)

Quarter

Q1 2026

Weeks in 2026

53

US week number

13

Week 13 is also written KW 13 (Kalenderwoche) or CW 13. 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 23 Mar to Saturday 28 Mar the same number: week 13.