Why is my date calculation not displaying anything?

I’m trying to use c# to get the number of days in-between two dates.

Here is my little program:

public class Program
{
    public static void Main()
    {
            DateTime today = DateTime.Now;
            DateTime futureDate = DateTime.Today.AddDays(3);
            int daysBetween = (int)Math.Round((futureDate - today).TotalDays);
            
            Console.WriteLine("Date testing\n\n");
        
            Console.WriteLine("Today: {0:MM/dd/yy H:mm}", today);
            Console.WriteLine("futureDate: {0:MM/dd/yy H:mm}", futureDate);
            Console.WriteLine("daysBetween: ", daysBetween);
    }
}

This is what I am getting.

Date testing
 
 
Today: 04/01/22 14:10 
futureDate: 04/04/22 0:00 
dateNumber:

For some reason, dateNumber is blank, but I am expecting it to be 3.

Is there a way to get that number?

Thanks!

>Solution :

You are printing a formatted string. The {0} means to insert the first parameter following the format string;

 Console.WriteLine("daysBetween: {0} ", daysBetween);