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Weekday Function (Visual Basic)

Returns an Integer value containing a number representing the day of the week.

Public Function Weekday( _
   ByVal DateValue As DateTime, _
   Optional ByVal DayOfWeek As FirstDayOfWeek = FirstDayOfWeek.Sunday _
) As Integer

DateValue

Required. Date value for which you want to determine the day of the week.

DayOfWeek

Optional. A value chosen from the FirstDayOfWeek enumeration that specifies the first day of the week. If not specified, FirstDayOfWeek.Sunday is used.

The DayOfWeek argument can have one of the following settings.

Enumeration value

Value

Description

FirstDayOfWeek.System

0

First day of week specified in system settings

FirstDayOfWeek.Sunday

1

Sunday (default)

FirstDayOfWeek.Monday

2

Monday (complies with ISO standard 8601, section 3.17)

FirstDayOfWeek.Tuesday

3

Tuesday

FirstDayOfWeek.Wednesday

4

Wednesday

FirstDayOfWeek.Thursday

5

Thursday

FirstDayOfWeek.Friday

6

Friday

FirstDayOfWeek.Saturday

7

Saturday

Exception type

Error number

Condition

ArgumentException

5

DayOfWeek is less than 0 or more than 7.

See the "Error number" column if you are upgrading Visual Basic 6.0 applications that use unstructured error handling. (You can compare the error number against the Number Property (Err Object).) However, when possible, you should consider replacing such error control with Structured Exception Handling Overview for Visual Basic.

The value returned by the Weekday function is the day of the week that the DateValue corresponds to, relative to the first day of the week defined by the DayOfWeek value. For example, if the date refers to a Wednesday and the first day of the week is specified as Monday, the function returns 3.

NoteNote:

Weekday uses the current calendar setting from the CurrentCulture property of the CultureInfo class in the System.Globalization namespace. The default CurrentCulture values are determined by Control Panel settings.

The following example uses the Weekday function to obtain the day of the week from a specified date.

Dim oldDate As Date 
Dim oldWeekDay As Integer
oldDate = #2/12/1969#
oldWeekDay = Weekday(oldDate)
' oldWeekDay now contains 4 because thisDate represents a Wednesday.

Namespace: Microsoft.VisualBasic

Module: DateAndTime

Assembly: Visual Basic Runtime Library (in Microsoft.VisualBasic.dll)

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