Date Time C#

using System;
using System.Globalization;
using System.Text.RegularExpressions;
using System.Threading;
public class Example
{
    public static void Main()
    {
        HijriCalendar hijri = new HijriCalendar();
        Thread.CurrentThread.CurrentCulture = new CultureInfo("ar-SY");
        CultureInfo current = CultureInfo.CurrentCulture;
        current.DateTimeFormat.Calendar = hijri;
        string dFormat = current.DateTimeFormat.ShortDatePattern;
        current.DateTimeFormat.ShortDatePattern = dFormat;
        DateTime date2 = new DateTime(1431, 9, 9, hijri);
        Console.WriteLine(current);
        Console.WriteLine(hijri);
        Console.WriteLine(date2);
    }
}