using System;

​

public class Example

{

    public static void Main()

    {

        DateTime myUTCDate1, myUTCDate2, myUTCDate3, myUTCDate4;

        TimeZoneInfo tzLocal = TimeZoneInfo.FindSystemTimeZoneById("Romance Standard Time"); //I use this for Belgium

        TimeZoneInfo tzUTC = TimeZoneInfo.FindSystemTimeZoneById("UTC");

​

        try {

            //30 septembre 1990 1h UTC : +1h au lieu de 2h préalablement (OK)

            //28 octobre 1990 1h UTC : +1h au lieu de 2h préalablement (OK, mais pas au bon moment)

            myUTCDate1 = new DateTime(1990, 09, 30, 0, 0, 0, DateTimeKind.Utc);

            myUTCDate2 = new DateTime(1990, 09, 30, 1, 0, 0, DateTimeKind.Utc);

            myUTCDate3 = new DateTime(1990, 10, 28, 0, 0, 0, DateTimeKind.Utc);

            myUTCDate4 = new DateTime(1990, 10, 28, 1, 0, 0, DateTimeKind.Utc);

            //Console.WriteLine("localZone.StandardName: {0}", TimeZone.CurrentTimeZone.StandardName);

            //Console.WriteLine("myDate1.Kind: {0}", myUTCDate1.Kind);

            Console.WriteLine("{0} {1} -> {2}", myUTCDate1, myUTCDate1.Kind, TimeZoneInfo.ConvertTime(myUTCDate1, tzUTC, tzLocal));

            Console.WriteLine("{0} {1} -> {2}", myUTCDate2, myUTCDate2.Kind, TimeZoneInfo.ConvertTime(myUTCDate2, tzUTC, tzLocal));

            Console.WriteLine("{0} {1} -> {2}", myUTCDate3, myUTCDate3.Kind, TimeZoneInfo.ConvertTime(myUTCDate3, tzUTC, tzLocal));

            Console.WriteLine("{0} {1} -> {2}", myUTCDate4, myUTCDate4.Kind, TimeZoneInfo.ConvertTime(myUTCDate4, tzUTC, tzLocal));

        }

        catch (FormatException) {

            Console.WriteLine("Invalid format.");

            return;

        }

    }

}