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Excel ISOWEEKNUM Function

You are here: Home / Excel Functions / Excel ISOWEEKNUM Function

The Excel ISOWEEKNUM function (new in Excel 2013) returns the week number of a date serial number. The first Monday of the year marks the start of week 1.

Tip: It also works with dates input as Text, but this could be unreliable so it's always best to work with date serial numbers.

Excel ISOWEEKNUM Function Syntax

Syntax: =ISOWEEKNUM(date)

Where the date represents a date in a format Excel recognises known as the date-time serial number. It can be contained in a cell, as shown in the examples below, or entered directly into the formula. E.g

=ISOWEEKNUM("2017,12,27")

Excel ISOWEEKNUM Function Examples

Excel ISOWEEKNUM Function

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Related Tutorials

Excel WEEKNUM Function Returns an integer representing the week number (from 1 to 54) of the year from a date serial number
Excel MONTH Function Returns the month from a date serial number.
Excel DAY Function Returns the day (of the month) from a date serial number
Excel YEAR Function Returns the year from a date serial number
Excel End of Period Dates Calculate fiscal period end dates

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