CSharp - Write program to Calculate Date Difference

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Requirements

You need to calculate the time span between two specific dates.

You need to know how many days or years have passed between the entered dates.

Read a user's date of birth.

The program displays how many days have passed.

Hint

You need to subtract the birth date from today's date.

When you subtract dates, the result is a TimeSpan object.

With TimeSpan, you can access its properties.

Demo

using System;
class Program{//  w  w w .j av a  2s.c  om
    static void Main(string[] args){
        // Input 
        Console.Write("Enter your date of birth: ");
        string input = Console.ReadLine();
        DateTime dateOfBirth = Convert.ToDateTime(input);

        // Today 
        DateTime today = DateTime.Today;

        // Date difference 
        TimeSpan difference = today - dateOfBirth;
        int numberOfDays = difference.Days;

        Console.WriteLine("Today is: " + today.ToShortDateString());
        Console.WriteLine("The world likes you for this number of days: " + numberOfDays.ToString("N0"));
    }
}

Result