C#: Add seconds to a DateTime value

Last update on August 26 2025 12:49:07 (UTC/GMT +8 hours)

Write C# Sharp Program to add 30 seconds and the number of seconds in one day to a DateTime value.

Note: It displays each new value and displays the difference between it and the original value. The difference is displayed both as a time span and as a number of ticks.

Sample Solution:-

C# Sharp Code:

using System;

public class Example13
{
    // Main method, entry point of the program
    public static void Main()
    {
        // Date format string for displaying dates without milliseconds
        string dateFormat = "MM/dd/yyyy hh:mm:ss";

        // Create a DateTime object 'date1' set to August 15, 2016, 4:00:00 PM
        DateTime date1 = new DateTime(2016, 8, 15, 16, 0, 0);
        Console.WriteLine("Original date: {0} ({1:N0} ticks)\n",
                          date1.ToString(dateFormat), date1.Ticks);

        // Create 'date2' by adding 30 seconds to 'date1'
        DateTime date2 = date1.AddSeconds(30);
        Console.WriteLine("Second date:   {0} ({1:N0} ticks)",
                          date2.ToString(dateFormat), date2.Ticks);
        Console.WriteLine("Difference between dates: {0} ({1:N0} ticks)\n",
                          date2 - date1, date2.Ticks - date1.Ticks);

        // Create 'date3' by adding 1 day (24 hours) to 'date1'
        DateTime date3 = date1.AddSeconds(60 * 60 * 24); // 60 secs * 60 mins * 24 hrs
        Console.WriteLine("Third date:    {0} ({1:N0} ticks)",
                          date3.ToString(dateFormat), date3.Ticks);
        Console.WriteLine("Difference between dates: {0} ({1:N0} ticks)",
                          date3 - date1, date3.Ticks - date1.Ticks);
    }
}

Sample Output:

Original date: 08/15/2016 04:00:00 (636,068,736,000,000,000 ticks)     
                                                                       
Second date:   08/15/2016 04:00:30 (636,068,736,300,000,000 ticks)     
Difference between dates: 00:00:30 (300,000,000 ticks)                 
                                                                       
Third date:    08/16/2016 04:00:00 (636,069,600,000,000,000 ticks)     
Difference between dates: 1.00:00:00 (864,000,000,000 ticks)

Flowcharts:

Flowchart: C# Sharp Exercises - Add seconds to a DateTime value

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C# Sharp Code Editor:

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