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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)

public enum FirstDayOfWeek

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

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: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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