isoweeknum
ISO 8601 week of the year.
Syntax
Section titled “Syntax”v = isoweeknum(date)Description
Section titled “Description”Returns the ISO 8601 week number — Mondays start weeks; week 1 contains the year’s first Thursday. Most international standard for week numbering.
Example
Section titled “Example”isoweeknum(date(2026, 1, 1))