DateTime.Add() Method in C# Last Updated : 18 Jan, 2019 Comments Improve Suggest changes Like Article Like Report This method is used to return a new DateTime that adds the value of the specified TimeSpan to the value of this instance. Syntax: public DateTime Add (TimeSpan value); Here, value is a positive or negative time interval. Return Value: This method returns an object whose value is the sum of the date and time represented by this instance and the time interval represented by value. Exceptions: This method will give ArgumentOutOfRangeException if the resulting DateTime is less than MinValue or greater than MaxValue. Below programs illustrate the use of DateTime.Add(TimeSpan) Method: Example 1: csharp // C# program to demonstrate the // DateTime.Add(TimeSpan) Method using System; using System.Globalization; class GFG { // Main Method public static void Main() { try { // creating object of DateTime DateTime date1 = new DateTime(2010, 1, 1, 8, 0, 15); // creating object of TimeSpan TimeSpan duration = new TimeSpan(36, 0, 0, 0); // adding the TimeSpan of 36 days // using Add() method; DateTime date2 = date1.Add(duration); // Display the date1 System.Console.WriteLine("DateTime before "+ "operation: {0:y} {0:dd}", date1); // Display the date2 System.Console.WriteLine("\nDateTime after"+ " operation: {0:y} {0:dd}", date2); } catch (ArgumentOutOfRangeException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } } Output: DateTime before operation: 2010 January 01 DateTime after operation: 2010 February 06 Example 2: For ArgumentOutOfRangeException csharp // C# program to demonstrate the // DateTime.Add(TimeSpan) Method using System; using System.Globalization; class GFG { // Main Method public static void Main() { try { // creating object of DateTime // and initialize with MinValue DateTime date1 = DateTime.MinValue; // Display the date1 Console.WriteLine("DateTime before "+ "operation: {0:y} {0:dd}", date1); // creating object of TimeSpan TimeSpan duration = new TimeSpan(-36, 0, 0, 0); // adding the TimeSpan of 36 days // using Add() method; DateTime date2 = date1.Add(duration); // Display the date2 Console.WriteLine("\nDateTime after"+ " operation: {0:y} {0:dd}", date2); } catch (ArgumentOutOfRangeException e) { Console.WriteLine("\nThe resulting DateTime"+ " is less than the MinValue "); Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } } Output: DateTime before operation: 0001 January 01 The resulting DateTime is less than the MinValue Exception Thrown: System.ArgumentOutOfRangeException Note: The Add method takes into account leap years and the number of days in a month when performing date arithmetic. This method does not change the value of this DateTime. Instead, it returns a new DateTime whose value is the result of this operation. Reference: https://docs.microsoft.com/en-us/dotnet/api/system.datetime.add?view=netframework-4.7.2 Comment More infoAdvertise with us Next Article DateTime.Add() Method in C# rohitprasad3 Follow Improve Article Tags : C# CSharp-method CSharp DateTime Struct Similar Reads DateTime.AddDays() Method in C# This method is used to return a new DateTime that adds the specified number of days to the value of this instance. Syntax: public DateTime AddDays (double value); Here, the value is the number of whole and fractional days. The value parameter can be negative or positive. Return Value: This method re 2 min read DateTime.AddYears() Method in C# This method is used to returns a new DateTime that adds the specified number of years to the value of this instance. 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