"Consider following class:

import java.text.DateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;
 
public class Main
{
    public static void main( String[] args )
    {
        GregorianCalendar date = new GregorianCalendar( 2020, Calendar.JANUARY,1 );
        DateFormat formatter = DateFormat.getDateTimeInstance();
 
        String expected = "01.01.2020, 00:00:00";
        String formatted = formatter.format( date.getTime() );
 
        System.out.println(String.format( "expected: %s%nactual: %s", expected, formatted ) );
  }
}

When running this class java 14 and with VM arguments `-
Duser.country=DE -Duser.language=de -XX:StartFlightRecording`, `date`
will be formatted to `01.01.2020, 00:00:00`.

When running this class with java 14 and VM arguments `-
Duser.country=DE -Duser.language=de -XX:StartFlightRecording
-XX:FlightRecorderOptions=stackdepth=128`, `date` will be formatted to
`2020 Jan 1 00:00:00`.

I'd expect that in both cases, the formatted date is identical.

This scenario works as expected with latest java 11."
https://mail.openjdk.java.net/pipermail/hotspot-jfr-dev/2020-March/001313.html