using System.Globalization;
public static void Main()
var date = "14/07/2018 14:00:00 ق.ظ";
DateTime dt=DateTime.ParseExact(date.Remove(date.IndexOf(" ")), "dd/MM/yyyy", CultureInfo.InvariantCulture);
Console.WriteLine(dt.Day);
Console.WriteLine(dt.Month);
Console.WriteLine(dt.Year);