returns ISO week number of a date · from excel · excel: verified match · sheets: verified match

signature

ISOWEEKNUM(date)

returns: number

argument	required
date	required

examples

formula and result, taken from the engine's own test suite — every result below is asserted in CI, not written by hand.

related

• DATE creates date from year, month, day
• DATEDIF calculates difference between two dates
• DATEVALUE converts date text to serial number
• DAY returns day of month from date
• DAYS returns number of days between two dates
• DAYS360 returns days between dates on 360-day year