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DateTime.AddMonths Method

Returns a new DateTime that adds the specified number of months to the value of this instance.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Function AddMonths ( _
	months As Integer _
) As DateTime

Parameters

months
Type: System.Int32

A number of months. The months parameter can be negative or positive.

Return Value

Type: System.DateTime
An object whose value is the sum of the date and time represented by this instance and months.

ExceptionCondition
ArgumentOutOfRangeException

The resulting DateTime is less than MinValue or greater than MaxValue.

-or-

months is less than -120,000 or greater than 120,000.

This method does not change the value of this DateTime object. Instead, it returns a new DateTime object whose value is the result of this operation.

The AddMonths method calculates the resulting month and year, taking into account leap years and the number of days in a month, then adjusts the day part of the resulting DateTime object. If the resulting day is not a valid day in the resulting month, the last valid day of the resulting month is used. For example, March 31st + 1 month = April 30th. The time-of-day part of the resulting DateTime object remains the same as this instance.

.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

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, 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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