ISOWEEKNUM

Date & time

The ISO 8601 week number of a date.

Syntax

ISOWEEKNUM(date)

Full notes for ISOWEEKNUM are still being written. Use the AI explainer below for the arguments, a worked example and common mistakes.

More Date & time functions

DATE DATEDIF DATESTRING DATEVALUE DAY DAYS DAYS360 EDATE EOMONTH HOUR MINUTE MONTH

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Syntax follows Microsoft’s documentation. Examples are written to be pasted into a cell and checked. Argument separators may be ; in your locale. The AI explainer runs on a free community model — verify anything important.