DateAndTime.Weekday(DateTime, FirstDayOfWeek) Method

Reference

Definition

Namespace:: Microsoft.VisualBasic

Assembly:: Microsoft.VisualBasic.Core.dll

Assembly:: Microsoft.VisualBasic.dll

Source:: DateAndTime.vb

Source:: DateAndTime.vb

Source:: DateAndTime.vb

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

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

public static int Weekday (DateTime DateValue, Microsoft.VisualBasic.FirstDayOfWeek DayOfWeek = Microsoft.VisualBasic.FirstDayOfWeek.Sunday);

static member Weekday : DateTime * Microsoft.VisualBasic.FirstDayOfWeek -> int

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

Parameters

DateValue: DateTime

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

DayOfWeek: FirstDayOfWeek

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

Returns

Int32

An integer value containing a number representing the day of the week.

Exceptions

ArgumentException

DayOfWeek is less than 0 or more than 7.

Examples

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.

Remarks

The value returned by the Weekday function corresponds to the values of the FirstDayOfWeek enumeration; that is, 1 indicates Sunday and 7 indicates Saturday.

Note

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 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

Applies to

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