DateTime.AddMonths() Method in C#

This method is used to return a new DateTime that adds the specified number of months to the value of this instance.

Syntax:

public DateTime AddMonths (int months);

Here, months is the number of months. The months parameter can be negative or positive.



Return Value: This method returns an object whose value is the sum of the date and time represented by this instance and months.

Exception: This method will throw ArgumentOutOfRangeException if the resulting DateTime is less than MinValue or greater than MaxValue or months is less than -120, 000 or greater than 120, 000.

Below programs illustrate the use of the above-discussed method:

Example 1:

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// C# program to demonstrate the
// DateTime.AddMonths(Int32) Method
using System;
  
class GFG {
  
// Main Method
public static void Main()
{
  
    // Creating a DateTime object
    DateTime d1 = new DateTime(2018, 4, 17);
  
    for (int i = 0; i <= 10; i++)
    {
  
        // using the method
        Console.WriteLine(d1.AddMonths(i).ToString("d"));
          
    }
      
    Console.WriteLine("In Leap Years:");
      
    // Creating a DateTime object
    // by taking a leap year
    // It is 31st March 2016
    DateTime d2 = new DateTime(2016, 03, 31);
      
    // taking a month value
    int m = 1;
      
    // using the method
    // Result will be 30 April 2016
    Console.WriteLine(d2.AddMonths(m).ToString("d"));
      
      
}
}

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Output:

04/17/2018
05/17/2018
06/17/2018
07/17/2018
08/17/2018
09/17/2018
10/17/2018
11/17/2018
12/17/2018
01/17/2019
02/17/2019
In Leap Years:
04/30/2016

Example 2:

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// C# program to demonstrate the
// DateTime.AddMonths(Int32) Method
using System;
  
class GFG {
  
// Main Method
public static void Main()
{
  
    // Creating a DateTime object
    // taking MaxValue
    DateTime d1 = DateTime.MaxValue;
  
    // taking a month MaxValue
    int m = 12005;
  
    // using the method will 
    // give an runtime error
    // as months parameter is
    // greater than 12000
    Console.WriteLine(d1.AddMonths(m).ToString("d"));
}
}

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Runtime Error:

Unhandled Exception:
System.ArgumentOutOfRangeException: The added or subtracted value results in an un-representable DateTime.
Parameter name: months

Note:

  • 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.
  • This 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.
  • The time-of-day part of the resulting DateTime object remains the same as this instance.

Reference:



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