What week of the year is it?

Enter today's date to see the current ISO 8601 week number.

How is the week number calculated?

Week numbers follow the ISO 8601 standard, where week 1 is the week containing the year's first Thursday, and weeks run Monday to Sunday.

Find the ISO 8601 week number for any date.

Date

Week 29

ISO 8601 week-numbering year 2026

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What week of the year is it?: Enter today's date to see the current ISO 8601 week number.
How is the week number calculated?: Week numbers follow the ISO 8601 standard, where week 1 is the week containing the year's first Thursday, and weeks run Monday to Sunday.