Javaコンポーネント:2つの時間の間隔を取得する日数

	/**
	 * @Desc              
	 * @param startTimeStr
	 * @param endTimeStr
	 * @return
	 */
	protected String getBetweenDays(String startTimeStr, String endTimeStr) {
		int betweenDays = 0;
		Date startTime = strToDateLong(startTimeStr);
		Date endTime = strToDateLong(endTimeStr);
		
		long start = startTime.getTime();
		long end = endTime.getTime();
		
		betweenDays = (int) (Math.abs(end - start)/(24*3600*1000));
		
		return String.valueOf(betweenDays + 1);
	}
	
	protected static Date strToDateLong(String strDate) {
		SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
		ParsePosition pos = new ParsePosition(0);
		Date strtodate = formatter.parse(strDate, pos);
		return strtodate;
	}
	
	private Calendar getDate(String dateStr) {
		Date startDate = null;
		try {
			startDate = new SimpleDateFormat("yyyy-MM-dd").parse(dateStr);
		} catch (ParseException e) {
			throw new IllegalArgumentException("Invalid start date, startDateStr=" + dateStr);
		}
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(startDate);
		return calendar;
	}