SimpleDateFormat - Timezone - SystemTime troubles

Question

Hi there,
I don't understand why the following little class produces the results it produces:
input timestamp = 1097670920739
formatted String #1 = 2004-35-13T14:35:20+0200
result timestamp = 1073997320000
formatted String #2 = 2004-35-13T13:35:20+0100
I would have expacted seeing two times the same timestamp and two times the same formatted String and have no idea where the problem is. Please Help.
Thanks
import java.util.Date;
import java.util.Locale;
import java.text.SimpleDateFormat;
public class TestDates {
private TestDates() {}
public static void main(String[] args) {
String input = "1097670920739";
// 1. Get Date-String from java-timestamp
SimpleDateFormat formatter1 = new SimpleDateFormat("yyyy-mm-dd'T'HH:mm:ssZ", Locale.GERMANY );
long timestamp1 = ( new Long( input ) ).longValue();
Date date1 = new Date( timestamp1 );
String string1 = formatter1.format( date1 );
// 2. Get back java-timestamp from Date-String
SimpleDateFormat formatter2 = new SimpleDateFormat("yyyy-mm-dd'T'HH:mm:ssZ", Locale.GERMANY );
Date date2 = null;
try { date2 = formatter2.parse( string1 ); } catch ( java.text.ParseException e ) {}
long timestamp2 = date2.getTime();
// 3. Get back Date-String form temp java-timestamp
SimpleDateFormat formatter3 = new SimpleDateFormat("yyyy-mm-dd'T'HH:mm:ssZ", Locale.GERMANY );
Date date3 = new Date( timestamp2 );
String string3 = formatter3.format( date3 );
System.out.println( "input timestamp = " + input );
System.out.println( "formatted String #1 = " + string1 );
System.out.println( "result timestamp = " + timestamp2 );
System.out.println( "formatted String #2 = " + string3 );
}

Answer 1

Well, one of your conversions isn't handling the daylight savings hour conversion properly.
Date date1 = new Date( timestamp1 );
Will convert the UTC / GMT long value into a date object for your default timezone on your pc.
Is your regional settings and timezone set up to German time on your pc ?
Sorry, haven't time to think this one through fully...
regards,
Owen