using System.Globalization;
public static void Main()
CultureInfo myCI = new CultureInfo("en-US", false);
CultureInfo myCIclone = (CultureInfo)myCI.Clone();
myCIclone.DateTimeFormat.AMDesignator = "a.m.";
myCIclone.DateTimeFormat.DateSeparator = "-";
myCIclone.NumberFormat.CurrencySymbol = "USD";
myCIclone.NumberFormat.NumberDecimalDigits = 4;
DateTime dateTime = DateTime.Parse("11/19/2000", myCIclone);
Console.WriteLine(dateTime);