public void testCustomIncompleteFormats_incompleteTime() {
        var formatter = DateFormatter.forPattern("yyyy-MM-dd mm");
        TemporalAccessor accessor = formatter.parse("1999-10-20 15");
        var parsed = DateFormatters.from(accessor).withZoneSameLocal(ZoneId.of("UTC")).toLocalDateTime();
        assertEquals(LocalDateTime.of(1999, 10, 20, 0, 15, 0), parsed);
        //                                             ^^
    }

    public void testCustomIncompleteFormats_incompleteDate() {
        var formatter = DateFormatter.forPattern("yyyy HH:mm");
        TemporalAccessor accessor = formatter.parse("1999 10:20");
        var parsed = DateFormatters.from(accessor).withZoneSameLocal(ZoneId.of("UTC")).toLocalDateTime();
        assertEquals(LocalDateTime.of(1999, 1, 1, 10, 20, 0), parsed);
        //                              ^^
    }