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FirstDayOfWeek Enumeration

Indicates the first day of the week to use when calling date-related functions.

Namespace:  Microsoft.VisualBasic
Assembly:  Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)

'Declaration
Public Enumeration FirstDayOfWeek

Member nameDescription
SystemThe first day of the week as specified in your system settings This member is equivalent to the Visual Basic constant vbUseSystemDayOfWeek.
SundaySunday (default) This member is equivalent to the Visual Basic constant vbSunday.
MondayMonday This member is equivalent to the Visual Basic constant vbMonday.
TuesdayTuesday This member is equivalent to the Visual Basic constant vbTuesday.
WednesdayWednesday This member is equivalent to the Visual Basic constant vbWednesday.
ThursdayThursday This member is equivalent to the Visual Basic constant vbThursday.
FridayFriday This member is equivalent to the Visual Basic constant vbFriday.
SaturdaySaturday This member is equivalent to the Visual Basic constant vbSaturday.

When you call date-related functions, you can use the following enumeration members in your code in place of the actual values.

Some date-related functions take a DayOfWeek argument, a WeekOfYear argument, or both. The FirstDayOfWeek enumeration specifies the valid values for the DayOfWeek arguments, as well as the possible return values from the functions.

The DayOfWeek argument takes the FirstDayOfWeek enumeration members.

Date-related functions also return FirstDayOfWeek values (except System).

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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