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 %PRODUCTNAME Calc, refer to this help page.

WeekDay (SerialDate, [FirstDayOfWeek])

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:

Value VBA Constant Description 0 vbUseSystemDayOfWeek Use system locale settings 1 vbSunday Sunday (default) 2 vbMonday Monday 3 vbTuesday Tuesday 4 vbWednesday Wednesday 5 vbThursday Thursday 6 vbFriday Friday 7 vbSaturday Saturday

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

Integer

The following example uses the function Now() to determine the current weekday. Sub ExampleWeekDay Dim sDay As String ' Return And display the day of the week 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,"Today Is" End Sub The following example illustrates the use FirstDayOfWeek parameter, assuming that Tuesday is the first day of the week. Dim someDay As Long ' The date January 1st 2021 was a Friday someDay = DateSerial(2021, 01, 01) ' Prints "6" assuming Sunday is the first day of the week MsgBox WeekDay(someDay) ' Prints "4" assuming Tuesday is the first day of the week MsgBox WeekDay(someDay, 3)