Weekmark

Calendar week · ISO 8601

Week 39, 2027

Monday 27 September – Sunday 3 October 2027

  1. Mon27Sep
  2. Tue28Sep
  3. Wed29Sep
  4. Thu30Sep
  5. Fri1Oct
  6. Sat2Oct
  7. Sun3Oct
ISO week
2027-W39
Copy as
CW39 (27 Sep – 3 Oct)
Quarter
Q3 2027
Weeks in 2027
52
US week number
40

Week 39 is also written KW 39 (Kalenderwoche) or CW 39. 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 27 Sep to Saturday 2 Oct a different number: week 40.