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# NÚM.SELMANA

WEEKNUM calculates the week number of the year for the internal date value as defined in ODF OpenFormula and compatible with other spreadsheet applications.

Supported are two week numbering systems:

Sistema | Descripción
--- | ---
Sistema 1 | The week containing January 1 is the first week of the year, and is numbered week 1.
Sistema 2 | The week containing the first Thursday of the year is the first week of the year, and is numbered week 1. That means that week number 1 of any year is the week that contains January 4th. ISO 8601 defines this system and that the week starts on Monday.

This function is part of the Open Document Format for Office Applications (OpenDocument) standard Version 1.2. (ISO/IEC 26300:2-2015)

### Sintaxis

SEM.DEL.AÑU(Númberu; Mou)

El númberu correspuende al númberu internu de la fecha.

Mode sets the start of the week and the week numbering system. This parameter is optional, if omitted the default value is 1.

Sistema | Mou | Día de la selmana
--- | --- | ---
Sistema 1 | 1 | Domingu
2 | Llunes
11 | Llunes
12 | Martes
13 | Miércoles
14 | Xueves
15 | Vienres
16 | Sábadu
17 | Domingu
Sistema 2 | 21 | Llunes (ISO 8601)
150 | (ISO 8601, for interoperability with Gnumeric)

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.

### Exemplos

=WEEKNUM(DATE(1995;1;1);1) returns 1

=WEEKNUM(DATE(1995;1;1);2) returns 1. Using System 1, the week containing January 1 is the first week of the year.

=WEEKNUM(DATE(1995;1;1);21) returns 52. Week 1 starts on Monday, 1995-01-02.

=WEEKNUM(DATE(1999;1;1);21) returns 53. Week 1 starts on Monday, 1999-01-04.

Temes rellacionaos

WEEKNUM wiki page.

Date & Time Functions

FECHA

DATEDIF

FECHANÚMERO

DÍA

DÍES

DÍES360

DAYSINMONTH

DÍESNELAÑU

DOMINGOPASCUA

FECHA.MES

FIN.MES

HORA

ISLEAPYEAR

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MINUTU

MES

MONTHS

NETWORKDAYS

NETWORKDAYS.INTL

AGORA

SEGUNDU

HORA

HORANÚMERO

GÜEI

WEEKDAY

NÚM.SELMANA

NÚM.SELMANA_ADD

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WEEKS

WEEKSINYEAR

DIA.LAB

WORKDAY.INTL

AÑU

FRAC.AÑU

YEARS