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## NUMSETMANA.ISO

NUMSETMANA.ISO calcula el número de setmana de l'any per a un valor de data intern.

La norma internacional ISO 8601 ha decretat que dilluns ha de ser el primer dia de la setmana. A una setmana que es troba parcialment en un any i parcialment en un altre se li assigna un nombre a l'any on es troben la majoria de dies. Això vol dir que la setmana número 1 de qualsevol any és la setmana que conté el dia 4 de gener.

### Syntax

ISOWEEKNUM(Number)

Nombre és el número intern de la data.

When entering dates as part of formulas, slashes or dashes used as date separators are interpreted as arithmetic operators. Therefore, dates entered in this format are not recognized as dates and result in erroneous calculations. To keep dates from being interpreted as parts of formulas use the DATE function, for example, DATE(1954;7;20), or place the date in quotation marks and use the ISO 8601 notation, for example, "1954-07-20". Avoid using locale dependent date formats such as "07/20/54", the calculation may produce errors if the document is loaded under different locale settings.

Unambiguous conversion is possible for ISO 8601 dates and times in their extended formats with separators. If a #VALUE! error occurs, then unselect Generate #VALUE! error in LibreOffice - Preferences Tools - Options - LibreOffice Calc - Formula, button Details... in section "Detailed Calculation Settings", Conversion from text to number list box.

### Example

=ISOWEEKNUM(DATE(1995;1;1)) returns 52. Week 1 starts on Monday, 1995-01-02.

=ISOWEEKNUM(DATE(1999;1;1)) returns 53. Week 1 starts on Monday, 1999-01-04.