DateTime.AddSeconds() Method in C#

The DateTime.AddSeconds() method in C# is used to add the specified number of seconds to the value of this instance. This returns a new DateTime.

Syntax

Following is the syntax −

public DateTime AddSeconds (double sec);

Here, sec is the seconds to be added. If you want to subtract seconds, then set a negative value.

Example

Let us now see an example to implement the DateTime.AddSeconds() method −

using System;
public class Demo {
   public static void Main(){
      DateTime d1 = new DateTime(2019, 10, 25, 6, 20, 40);
      DateTime d2 = d1.AddSeconds(25);
      System.Console.WriteLine("Initial DateTime = {0:dd} {0:y}, {0:hh}:{0:mm}:{0:ss} ", d1);
      System.Console.WriteLine("
New DateTime (After adding seconds) = {0:dd} {0:y}, {0:hh}:{0:mm}:{0:ss} ", d2);
   }
}

Output

This will produce the following output −

Initial DateTime = 25 October 2019, 06:20:40
New DateTime (After adding seconds) = 25 October 2019, 06:21:05

Example

Let us now see another example to implement the DateTime.AddSeconds() method −

using System;
public class Demo {
   public static void Main(){
      DateTime d1 = new DateTime(2019, 10, 25, 6, 20, 40);
      DateTime d2 = d1.AddSeconds(-10);
      System.Console.WriteLine("Initial DateTime = {0:dd} {0:y}, {0:hh}:{0:mm}:{0:ss} ", d1);
      System.Console.WriteLine("
New DateTime (After subtracting seconds) = {0:dd} {0:y}, {0:hh}:{0:mm}:{0:ss} ", d2);
   }
}

Output

This will produce the following output −

Initial DateTime = 25 October 2019, 06:20:40
New DateTime (After subtracting seconds) = 25 October 2019, 06:20:30