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