code: @Nonnull
    public static GregorianCalendar getCalendarDefaultTimeZone (final long nMillis)
    {
      final GregorianCalendar aCalendar = new GregorianCalendar (PDTConfig.getDefaultTimeZone (),
                                                                 Locale.getDefault (Locale.Category.FORMAT));
      aCalendar.setTimeInMillis (nMillis);
      return aCalendar;
    }
docs: Get the passed milliseconds as {@link GregorianCalendar}.
  
  @param nMillis
  Milliseconds since 1.1.1970
  @return Never <code>null</code>.
  @since 9.1.8