Week number
An ISO week is anchored on its Thursday. The page also shows the first and last day of that week.
How to use it
- Pick a date. The page shows that date’s ISO week number.
- The week runs from Monday through Sunday.
- Near the new year, the week belongs to the year of its Thursday. The first and last days appear next to the number.
Common questions
Which day starts the week?
Monday, following the ISO week.
Can the week belong to another year?
Yes. If that week’s Thursday falls in the other year, the week number belongs there.
Where are the first and last days of the week?
They are printed next to the week number. The week runs from Monday through Sunday.