różne wersje parsowania kwoty i daty (CultureInfo), C#

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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Globalization;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string kwS = "1316,1";
            double kwD = 0d;
            
            List<string> kultury = new List<string>() {"de-DE", "en-US", "pl-PL", "fr-FR", "it-IT"};
            foreach(string clt in kultury)
            {
                CultureInfo cltI = new CultureInfo(clt);
                double.TryParse(kwS, NumberStyles.Currency, cltI, out kwD);
                Console.WriteLine(string.Format("{0}: {1}",cltI.Name,kwD));
            }

string frm = "yyyy+MM+dd";
            string dt = "2013+12+31";
            DateTime wartosc;
            if(DateTime.TryParseExact(dt, frm, null, DateTimeStyles.AssumeLocal, out wartosc)) Console.WriteLine("Data - OK.");

foreach(string clt in kultury)
            {
                CultureInfo cltI = new CultureInfo(clt);
                Console.WriteLine(string.Format("{0}: {1}", cltI.Name, wartosc.ToString(cltI)));
            }
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0.16 sec, absolute running time: 0.08 sec, cpu time: 0.06 sec, average memory usage: 16 Mb, average nr of threads: 4