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DateTime.AddMonths Method

Adds the specified number of months to the value of this instance.

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

public DateTime AddMonths (
	int months
)
public DateTime AddMonths (
	int months
)
public function AddMonths (
	months : int
) : DateTime
Not applicable.

Parameters

months

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

Return Value

A DateTime whose value is the sum of the date and time represented by this instance and months.

Exception typeCondition

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, a new DateTime object is returned 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.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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