Read Two Dates And Calculate The Period Between Them

using System;
using System.Globalization;

class ReadTwoDatesCalcPeriodBetweenThem
{
  //Write a program that reads two dates in the format: day.month.year and calculates the number of days between them. Example:
  //Enter the first date: 27.02.2006
  //Enter the second date: 3.03.2006
  //Distance: 4 days

  static DateTime ParseDate(string dateAsString)
  {
    DateTime date = DateTime.ParseExact(dateAsString, "d.M.yyyy", CultureInfo.InvariantCulture);
    return date;
  }

  static void Main()
  {
    Console.WriteLine("The format for the dates is day.month.year (e.g. 31.12.2012)");

    try
    {
      Console.Write("Enter the first date: ");
      string input = Console.ReadLine();
      DateTime startDate = ParseDate(input);

      Console.Write("Enter the second date: ");
      input = Console.ReadLine();
      DateTime endDate = ParseDate(input);

      double resultDistance = (endDate - startDate).TotalDays;

      Console.WriteLine("Distance: {0} day/s/", resultDistance);
    }
    catch (FormatException)
    {
      Console.WriteLine("Please enter the dates in the correct format 31.12.2012! Make sure that such a date exists!"); ;
    }
    catch (ArgumentNullException)
    {
      Console.WriteLine("Please provide a date. The date cannot be null!");
    }
  }
}