Google Sheets - ISOWEEKNUM

ISOWEEKNUM returns the number of week of a date using ISO standard, that is, whether a date is the 5th, or 17th week of a year etc.

Syntax

ISOWEEKNUM(date)

Example

Notes

  • Per ISO standard, a week begins on Monday and ends on Sunday.
  • Under ISO standard, whether a week belongs to a years depending whether its Thursday falls in a year. Therefore, January 1 is not always week 1 of a year, it can be week 53 of the last year. Similarly, December 31 is not always week 52, it can week 53 of the current year, of week 1 of the next year.



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