WEEKNUM in WPS on Windows FAQ

Last updated:July 20, 2026

This FAQ covers 3 common question types about WEEKNUM, including formula errors, different week-number results, and date recognition issues.

FAQ

What should I do if the WEEKNUM function shows an error?

  1. Check whether the formula starts with =.
  2. Make sure the parentheses are paired correctly and the arguments use the correct separator.
  3. Confirm that the date argument is a valid date, a cell reference to a date, or a formula that returns a date.
  4. If you entered a second argument, make sure its value matches the function rule you want to use.

Why can the same date return different week numbers?

  1. Check whether the WEEKNUM formula uses a second argument.
  2. Confirm which week-start rule is currently being used.
  3. If you need ISO week numbering, use the corresponding parameter setting before comparing results.
  4. Keep the parameter pattern consistent across the worksheet so one column does not mix different rules.

Why is the WEEKNUM result not updating automatically?

  1. Make sure the referenced date cell has been edited and the input is confirmed.
  2. Check whether the formula points to the correct cell.
  3. Review whether the date cell contains text instead of a real date value.
  4. Confirm the formula again and press Enter so the worksheet recalculates the current result.

Glossary

TermDefinition
WEEKNUMA date function that returns which week of the year a specified date belongs to.
Date argumentThe input value used in WEEKNUM to specify the target date, such as a date, a cell reference, or a formula that returns a date.
Week start dayThe rule that defines which day starts a week, which can affect the returned week number.