两个日期类相减得到相差天数的小函数

public int daysBetween(Date smdate, Date bdate) throws Exception {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		smdate = sdf.parse(sdf.format(smdate));
		bdate = sdf.parse(sdf.format(bdate));
		Calendar cal = Calendar.getInstance();
		cal.setTime(smdate);
		long time1 = cal.getTimeInMillis();
		cal.setTime(bdate);
		long time2 = cal.getTimeInMillis();
		long between_days = (time2 - time1) / (1000 * 3600 * 24);

		return Integer.parseInt(String.valueOf(between_days));
	}

<%
	int nowDate = Integer.parseInt(new java.util.Date().getDate() + ""); //获得当前日期
	int nowMonth = Integer.parseInt(new java.util.Date().getMonth() + 1 + ""); //获得当前月份
%>