WEEKNUM function

Function Type:

Date and Time

Description:

WEEKNUM function in Excel or Google Sheets Converts a serial number to a number representing where the week falls numerically with a year. This function is useful in formulas when you need to know the week number, especially when you're in the middle of the year where it gets confusing to keep track. I mostly use this on Dashboards/Summary computations involving annual or weekly performance.

In my head, WEEKNUM is short for WEEK NUMber.

Function Structure:

=WEEKNUM (serial_number, [return_type])

Argument Breakdown:

serial_number - A valid Excel date in a serial number format.

[return_type] - You can specify the day the week begins. Default is 1 when omitted.

Options:
1 - Sunday /
2 - Monday / 11 - Monday / 12 - Tuesday / 13 - Wednesday / 14 - Thursday / 15 - Friday / 16 - Saturday / 17 - Sunday / 21 - Monday

Example:

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