LocalDate的简要使用demo,日期年月日加减

获取当前日期

LocalDate today = LocalDate.now(); //获取当前日期 年月日

LocalDate 与 String 之间的转换

        LocalDate today = LocalDate.now();
        DateTimeFormatter df= DateTimeFormatter.ofPattern("yyyy-MM-dd");
        String dateStr = today.format(df);

传入日期，获取指定范围日期demo

public static String getStartDate(String queryType, String newestDay) {
        // 根据查询类型获取日期
        DateTimeFormatter df = DateTimeFormatter.ofPattern(DateUtils.DATE_YYYYMMDD);
        LocalDate localDate = LocalDate.parse(newestDay, df);
        switch (IntervalEnum.getEnum(queryType)) {
            case M1:
                localDate = localDate.minusMonths(1);
                break;
            case M3:
                localDate = localDate.minusMonths(3);
                break;
            case M6:
                localDate = localDate.minusMonths(6);
                break;
            case Y1:
                localDate = localDate.minusYears(1);
                break;
            case Y3:
                localDate = localDate.minusYears(3);
                break;
            case ALL:
                return null;
            default:          
        }
        //起始日设置
        return localDate.format(df);
    }