I'm getting different values in milliseconds for the same date in past while using JodaTime lib and java.util.Calendar. For example for the first year AD

void test() {
    int year = 1;
    DateTime dt = new DateTime(year, 1,1,0,0,0,0);
    dt = dt.toDateTime(GregorianChronology.getInstance());

    Calendar cal = Calendar.getInstance();
    cal.clear();
    cal.set(year, 0, 1, 0, 0, 0);

    DateTime endDate = new DateTime(cal.getTimeInMillis());
    endDate = endDate.toDateTime(GregorianChronology.getInstance());

    System.out.println("JodaTime: " + dt);
    System.out.println("JodaTime, ms: " + dt.getMillis());
    System.out.println("Calendar: " + cal.getTime());
    System.out.println("Calendar, ms: " + cal.getTimeInMillis());
    System.out.println("JodaTime by Calendar: " + endDate);
}

By default DateTime use ISOChronology and Calendar is GregorianCalendar (except TH and JA locales). So I set GregorianChronology, but nothing changed. Result of execution is

JodaTime:       0001-01-01T00:00:00.000+01:34:52
JodaTime, ms:   -62135602492000
Calendar:       Sat Jan 01 00:00:00 EET 1
Calendar, ms:   -62135776800000
JodaTime by Calendar:   0000-12-29T23:34:52.000+01:34:52

Could someone suggest am I wrong with something?