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FirstWeekOfYear Enumeration

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

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

public enum FirstWeekOfYear

Member nameDescription
SystemThe weekspecified in your system settings as the first week of the year. This member is equivalent to the Visual Basic constant vbUseSystem.
Jan1The week in which January 1 occurs (default). This member is equivalent to the Visual Basic constant vbFirstJan1.
FirstFourDaysThe first week that has at least four days in the new year. This member is equivalent to the Visual Basic constant vbFirstFourDays.
FirstFullWeekThe first full week of the year. This member is equivalent to the Visual Basic constant vbFirstFullWeek.

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 FirstWeekOfYear enumeration specifies the valid values for the WeekOfYear arguments, as well as the possible return values from the functions.

The WeekOfYear argument takes the FirstWeekOfYear enumeration members.

.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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