The WEEKNUM function in Excel retrieves the week number from a given date, with the option to specify the starting day of the week via the return_type parameter. If the input date is invalid, it returns a #VALUE! error, and if an unsupported return_type is entered, a #NUM! error is displayed instead. The function contrasts with ISOWEEKNUM, which adheres strictly to the ISO 8601 standard, ensuring consistent results. Practical examples illustrate how the function operates, including edge cases of invalid dates.
The WEEKNUM function in Excel identifies the week number from an input date, with specific handling for valid and invalid dates.
Using WEEKNUM, the beginning day of the week can be defined via a return_type value, which determines if the week starts on Sunday or Monday.
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