java,时间比较大小

try {
			SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
//			System.out.println(sdf.format(new Date()));//00:49
			Date now = sdf.parse(sdf.format(new Date()));
			Date beforeSunRise = sdf.parse("06:00");
			Date sunRise = sdf.parse("08:00");
			Date sunNoon = sdf.parse("14:00");
			Date sunSet = sdf.parse("16:53");
			Date afterSunSet = sdf.parse("23:53");
			
			Long nowTime = now.getTime();
			Long beforeSunRiseTime = beforeSunRise.getTime();
			Long sunRiseTime = sunRise.getTime();
			Long sunNoonTime = sunNoon.getTime();
			Long sunSetTime = sunSet.getTime();
			Long afterSunSetTime = afterSunSet.getTime();
			
			System.out.println(nowTime);
			System.out.println(bef