A DESCRIPTION OF THE PROBLEM :
java.text.MessageFormat

the method: MessageFormat.format
see line 1272

 private StringBuffer subformat
....
} else if (obj instanceof Number) {
                    // format number if can
                    subFormatter = NumberFormat.getInstance(locale);
                } else if (obj instanceof Date) {
                    // format a Date if can
                    subFormatter = DateFormat.getDateTimeInstance(
                             DateFormat.SHORT, DateFormat.SHORT, locale);//fix
                } else if (obj instanceof String) {
                    arg = (String) obj;

                }
...

can't work with java.time.LocalDate and java.time.LocalDateTime
only with old java.util.Date


FREQUENCY : always