public static void main(String[] args) {
		try {
			String s1 = "2022-01-01";
			String s2 = "2022-01-03";
			// 算兩個日期間隔多少天
			SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
			Date date1 = format.parse(s1);
			Date date2 = format.parse(s2);
			String dateTimeStart = "";
			String dateTimeEnd = "";
			String dateStart = "";
			String dateEnd = "";
			int datelen
 
 = (int) ((date2.getTime() - date1.getTime()) / (1000 * 3600 * 24));
			Date sDate = format.parse(s1);
			// logger.info("-------------合併開始" + DateUtils.getNowString());
			for (int i = 0; i <= datelen; i++) {
				dateTimeStart = format.format(sDate) + " 00:00:00";
				dateStart = format.format(sDate);
				// 日期+1
				Calendar c = Calendar.getInstance();
				c.setTime(sDate);
				c.add(Calendar.DAY_OF_MONTH, 1);
 


				sDate = c.getTime();
				dateTimeEnd = format.format(sDate) + " 00:00:00";
				dateEnd = format.format(sDate);
				logger.info(dateTimeStart + "++++++" + dateTimeEnd);
			}
		} catch (java.lang.Exception e) { // java.lang.Exception
		}
		
	}

　　列印結果：