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DateTime::AddYears Method

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

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

public:
DateTime AddYears(
	int value
)

Parameters

value
Type: System::Int32

A number of years. The value 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 the number of years represented by value.

ExceptionCondition
ArgumentOutOfRangeException

value or the resulting DateTime is less than MinValue or greater than MaxValue.

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 AddYears method calculates the resulting year taking into account leap years. The month and time-of-day part of the resulting DateTime object remains the same as this instance.

If the current instance represents the leap day in a leap year, the return value depends on the target date:

  • If value + DateTime::Year is also a leap year, the return value represents the leap day in that year. For example, if four years is added to February 29, 2012, the date returned is February 29, 2016.

  • If value + DateTime::Year is not a leap year, the return value represents the day before the leap day in that year. For example, if one year is added to February 29, 2012, the date returned is February 28, 2013.

The following example illustrates using the AddYears method with a DateTime value that represents a leap year day. It displays the date for the fifteen years prior to and the fifteen years that follow February 29, 2000.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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