Weekmark

Calendar week · ISO 8601

Week 21, 2027

Monday 24 May – Sunday 30 May 2027

  1. Mon24May
  2. Tue25May
  3. Wed26May
  4. Thu27May
  5. Fri28May
  6. Sat29May
  7. Sun30May
ISO week
2027-W21
Copy as
CW21 (24–30 May)
Quarter
Q2 2027
Weeks in 2027
52
US week number
22

Week 21 is also written KW 21 (Kalenderwoche) or CW 21. 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 24 May to Saturday 29 May a different number: week 22.