Week number
The math stays in this tab. Nothing is uploaded.
ISO week
How to use this tool
Find the ISO week number for a date in this tab. Nothing is uploaded.
Open Week number
Today is already filled. ISO week, year, and weekday sit on the right.
Pick another date
Week 1 contains the first Thursday of the year. Monday is weekday 1.
Copy the week
Copy puts the ISO week label on the clipboard.
FAQ
Can I find the week number here?
Yes. Pick a date. The tab shows the ISO week, ISO year, and weekday. Monday is day 1.
Is this uploaded?
No. The math stays in this tab.
US week numbers?
No. This is ISO-8601. Week 1 is the week with the year’s first Thursday. A late December date can belong to the next year’s week 1.
What about Sunday?
Sunday is weekday 7. The ISO week still starts on Monday.
Can I copy the result?
Yes. Copy puts the ISO week label and weekday on the clipboard.