java比较两个时间字符串的大小

	@Test
	public void subStr() {
	    String dateStr = "2018-05-24 12:00:00";
            long longDate = Long.valueOf(dateStr.replaceAll("[-\\s:]",""));
            System.out.println(longDate);
	}

将时间字符串转成Long类型进行比较