DateTime.AddMonths Method (Int32)
Returns a new DateTime that adds the specified number of months to the value of this instance.
Assembly: mscorlib (in mscorlib.dll)
A number of months. The months parameter can be negative or positive.
Return ValueType: System.DateTime
An object whose value is the sum of the date and time represented by this instance and months.
The 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, and March 31st - 1 month = February 28 for a non-leap year and February 29 for a leap year.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
The time-of-day part of the resulting DateTime object remains the same as this instance.
The following example adds between zero and fifteen months to the last day of December, 2015. In this case, the AddMonths method returns the date of the last day of each month, and successfully handles leap years.
Module Example Public Sub Main() Dim dat As Date = #12/31/2015# For ctr As Integer = 0 To 15 Console.WriteLine(dat.AddMonths(ctr).ToString("d")) Next End Sub End Module ' The example displays the following output: ' 12/31/2015 ' 1/31/2016 ' 2/29/2016 ' 3/31/2016 ' 4/30/2016 ' 5/31/2016 ' 6/30/2016 ' 7/31/2016 ' 8/31/2016 ' 9/30/2016 ' 10/31/2016 ' 11/30/2016 ' 12/31/2016 ' 1/31/2017 ' 2/28/2017 ' 3/31/2017
Available since 4.5
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Available since 8.1