How to Use the WEEKNUM Function in WPS on Windows

Last updated:July 20, 2026

This how-to guide includes 3 topics, all available without membership, so you can enter the function, set parameters, and verify results step by step.

How-to Index

No.TopicMembership Requirement
11. Enter the WEEKNUM functionFree
22. Set WEEKNUM parametersFree
33. Check and update WEEKNUM resultsFree

How-to Guide

1. Enter the WEEKNUM function

Entry path: WPS Spreadsheet → target cell → formula bar

  1. Open WPS Spreadsheet and select the cell where you want the week number to appear.
  2. Type = in the cell or formula bar.
  3. Continue by typing WEEKNUM(.
  4. Check the function prompt to confirm the function name and parameter format.
  5. Enter the date argument, then close the parenthesis or continue with the second argument.

Success Criteria

  • Interface result: The cell or formula bar shows a formula starting with =WEEKNUM(.
  • Next action available: You can continue entering the date argument and week-type argument.

Tips While Using

  • Common mistake: If you do not start with =, the content is treated as plain text.
  • Environment note: The date argument should be a valid date or a formula result that returns a date.

2. Set WEEKNUM parameters

Entry path: A cell that already contains the WEEKNUM formula

  1. After WEEKNUM(, enter the date to calculate or a cell reference that contains the date.
  2. If you need a specific week-start rule, enter the second argument after a comma.
  3. Check that parentheses, commas, and references are complete.
  4. Press Enter to confirm the formula.

Success Criteria

  • Interface result: The cell displays a week number result.
  • Next action available: You can copy the formula to other rows or columns for batch calculation.

Tips While Using

  • Common mistake: If the date is entered as unrecognized text, the formula may return an error.
  • Environment note: Different second-argument values can change the week start day and returned result.

3. Check and update WEEKNUM results

Entry path: A worksheet where WEEKNUM has already been calculated

  1. Change the content of the referenced date cell.
  2. Check whether the WEEKNUM result updates when the date changes.
  3. If the result looks incorrect, review the date format, parameter order, and cell references.
  4. If you need to apply the formula in bulk, fill it down or across.

Success Criteria

  • Interface result: The week number changes together with the updated date.
  • Next action available: You can use the result for filtering, sorting, summarizing, or other formulas.

Tips While Using

  • Common mistake: Referencing the wrong cell can produce an unexpected result.
  • Environment note: If the source date is blank or invalid, the result may not return normally.