Java 获取季度开始时间结束时间,获取日期所在月份,获取所在季度

/**
 根据季度数获取季度的开始时间结束时间
*/
public static Map<String, String> getQuarterStartEndTime(int quarter) {
        Map<String, String> result = new HashMap<>();
        Calendar start = Calendar.getInstance();
        Calendar end = Calendar.getInstance();
        try {
            if (quarter == 1 ) {
                start.set(Calendar.MONTH, 0);
                start.set(Calendar.DATE,1);
                end.set(Calendar.MONTH, 2);
                end.set(Calendar.DATE, 31);
            } else if (quarter == 2) {
                start.set(Calendar.MONTH, 3);
                start.set(Calendar.DATE,1);
                end.set(Calendar.MONTH, 5);
                end.set(Calendar.DATE, 30);
            } else if (quarter == 3) {
                start.set(Calendar.MONTH, 6);
                start.set(Calendar.DATE,1);
                end.set(Calendar.MONTH, 8);
                end.set(Calendar.DATE, 30);
            } else if (quarter == 4) {
                start.set(Calendar.MONTH, 9);
                start.set(Calendar.DATE,1);
                end.set(Calendar.MONTH, 11);
                end.set(Calendar.DATE, 31);
            }
            end.add(Calendar.DATE,1);
            result.put("startTime",DateUtils.format(start.getTime()));
            result.put("endTime",DateUtils.format(end.getTime()));
        } catch (Exception e) {
            log.error(e.getMessage(),e);
        }
        return result;
    }

/**
根据时间获取月份
*/
   private static int getMonth(Date date){
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        return c.get(Calendar.MONTH)+1;
    }

    /**
     * 获取季度
     * @param date
     * @return
     */
    private static int getSeason(Date date) {
        int season = 0;
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        int month = c.get(Calendar.MONTH);
        switch (month) {
            case Calendar.JANUARY:
            case Calendar.FEBRUARY:
            case Calendar.MARCH:
                season = 1;
                break;
            case Calendar.APRIL:
            case Calendar.MAY:
            case Calendar.JUNE:
                season = 2;
                break;
            case Calendar.JULY:
            case Calendar.AUGUST:
            case Calendar.SEPTEMBER:
                season = 3;
                break;
            case Calendar.OCTOBER:
            case Calendar.NOVEMBER:
            case Calendar.DECEMBER:
                season = 4;
                break;
            default:
                break;
        }
        return season;
    }