间隔日期转换成:x天 x月 x年x月

实例：

String confirmDateString = hypertension.getConfirmDate();
    LocalDate today = LocalDate.now();

    LocalDate confirmDate = LocalDate.parse(confirmDateString, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));

    Period p = Period.between(confirmDate, today);
    System.out.println(p);

    String result = "";
    if (p.getDays() > 0) {
        result = p.getDays() + "天";
    }
    if (p.getMonths() > 0) {
        result = p.getMonths() + "月";
    }
    if (p.getYears() > 0) {
        result = p.getYears() + "年" + p.getMonths() + "月";
    }

    hypertension.setDeaseAge(result);
}