Weekmark

Calendar week · ISO 8601

Week 1, 2028

Monday 3 January – Sunday 9 January 2028

  1. Mon3Jan
  2. Tue4Jan
  3. Wed5Jan
  4. Thu6Jan
  5. Fri7Jan
  6. Sat8Jan
  7. Sun9Jan
ISO week
2028-W01
Copy as
CW1 (3–9 Jan)
Quarter
Q1 2028
Weeks in 2028
52
US week number
2

Week 1 is also written KW 1 (Kalenderwoche) or CW 1. 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 3 Jan to Saturday 8 Jan a different number: week 2.