WEEKNUM Google Sheets function

The WEEKNUM function in Google Sheets provides a way to determine the specific week number in a given year for a particular date. This can be particularly useful for organizing schedules, tracking data by week, or reporting purposes where weekly intervals are significant.

Syntax

WEEKNUM(date, [type])
  • date: The date for which you want to find the corresponding week number; this can be a reference to a cell containing a date or a date value in quotes.
  • type: (optional) A number that defines the system to use for numbering weeks. The default is 1, which means weeks start on Sunday. If set to 2, the week starts on Monday.

Example #1

WEEKNUM("2023-10-01")
This function returns the week number for October 1, 2023, using the default setting where the week starts on Sunday. For this date, the result will be 40.

Example #2

WEEKNUM("2023-10-01", 2)
This function evaluates the week number for October 1, 2023, based on a week that starts on Monday. In this case, the week number returned will be 39.

Example #3

WEEKNUM(A1)
If cell A1 contains the date “2023-12-25”, this function calculates the week number for December 25, 2023, with the result being 52, as this date falls in the last week of the year.

Error handling

  • VALUE!: This error occurs if the date provided is not recognized as a valid date. Ensure the argument is a correctly formatted date.
  • NUM!: This error arises if the week type parameter specified is not a permissible value, meaning it should be either 1 or 2. Make sure to use valid types.

Conclusion

In summary, the WEEKNUM function is a valuable tool for users looking to categorize dates by week number in Google Sheets. Whether for academic, business, or personal use, understanding how to effectively apply this function can greatly enhance your data management capabilities.

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