DateTime format and invariant culture.

using System;
using System.Text;
using System.Globalization;
class Sample
{
    public static void Main()
    {
        DateTime dt = new DateTime(2000, 1, 2);
        CultureInfo iv = CultureInfo.InvariantCulture;
        Console.WriteLine(dt.ToString(iv));
        Console.WriteLine(dt.ToString("d", iv));
    }
}