DateTimeOffset.AddMonths() Method in C#

This method is used to return a new DateTimeOffset object that adds a specified number of months to the value of the current instance.

Syntax: public DateTimeOffset AddMonths (int months);
Here, it takes a number of whole months. The number can be negative or positive.

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

Exception: This method will give ArgumentOutOfRangeException if the resulting DateTimeOffset value is less than MinValue or the resulting DateTimeOffset value is greater than MaxValue.

Below programs illustrate the use of DateTimeOffset.AddMonths(Int32) Method:

Example 1:

// C# program to demonstrate the
// DateTimeOffset.AddMonths(Double)
// Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        try {

            // creating object of DateTimeOffset
            DateTimeOffset offset = new DateTimeOffset(2007,
                    6, 1, 7, 55, 0, new TimeSpan(-5, 0, 0));

            // adding a specified number of whole and
            // fractional months to the value of this
            // instance using AddMonths() method
            DateTimeOffset value = offset.AddMonths(10);

            // Display the time
            Console.WriteLine("DateTimeOffset is {0}", value);
        }

        catch (ArgumentOutOfRangeException e) {
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

Output:

DateTimeOffset is 04/01/2008 07:55:00 -05:00

Example 2: For ArgumentOutOfRangeException

// C# program to demonstrate the
// DateTimeOffset.AddMonths(Double)
// Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        try {

            // creating object of DateTimeOffset
            DateTimeOffset offset = DateTimeOffset.MaxValue;

            // adding a specified number of whole and
            // fractional months to the value of this
            // instance using AddMonths() method
            DateTimeOffset value = offset.AddMonths(10);

            // Display the time
            Console.WriteLine("DateTimeOffset is {0}", value);
        }

        catch (ArgumentOutOfRangeException e) {
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

Output:

Exception Thrown: System.ArgumentOutOfRangeException

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.datetimeoffset.addmonths?view=netframework-4.7.2