WeekDay Function

This function returns the number corresponding to the weekday represented by a serial date number that is generated by the DateSerial or the DateValue functions.

This help page describes the WeekDay function used in Basic scripts. If you are interested in the WeekDay function used in LibreOffice Calc, refer to this help page.

Sintaxis:


  WeekDay (SerialDate, [FirstDayOfWeek])

Parámetros:

SerialDate: Integer expression that contains the serial date number that is used to calculate the day of the week.

FirstDayOfWeek: Integer value indicating which weekday should be considered as the first day of the week. The default value is 0, meaning that the system locale settings are used to determine the first day of the week.

The parameter FirstDayOfWeek accepts values ranging from 0 to 7. The table below describes the meaning of each possible value:

Valor	Constante de VBA	Descripción
0	vbUseSystemDayOfWeek	Use system locale settings
1	vbSunday	Domingo (predeterminado)
2	vbMonday	Lunes
3	vbTuesday	Martes
4	vbWednesday	Miércoles
5	vbThursday	Jueves
6	vbFriday	Viernes
7	vbSaturday	Sábado

The VBA constants listed above are only available if VBA support has been enabled. For more information, read the VBASupport Statement help page.

Valor de retorno:

Entero

Códigos de error:

5 Llamada a procedimiento no válida

Ejemplo:

The following example uses the function Now() to determine the current weekday.


Sub ExampleWeekDay
    Dim sDay As String
    ' Devolver y mostrar el día de la semana
    Select Case WeekDay( Now )
            Case 1: sDay="Sunday"
            Case 2: sDay="Monday"
            Case 3: sDay="Tuesday"
            Case 4: sDay="Wednesday"
            Case 5: sDay="Thursday"
            Case 6: sDay="Friday"
            Case 7: sDay="Saturday"
    End Select
    MsgBox "" + sDay,64,"Hoy es"
End Sub

The following example illustrates the use FirstDayOfWeek parameter, assuming that Tuesday is the first day of the week.


  Dim someDay As Long
  ' La fecha 1 de enero de 2021 cayó en viernes
  someDay = DateSerial(2021, 01, 01)
  ' Genera «6», suponiendo que el domingo sea el primer día de la semana
  MsgBox WeekDay(someDay)
  ' Genera «4», suponiendo que el martes sea el primer día de la semana
  MsgBox WeekDay(someDay, 3)