日期比较，忽略时间

	public static void trimCalendarToDay(final Calendar cal) {
		cal.set(Calendar.HOUR_OF_DAY, 0);
		cal.set(Calendar.MINUTE, 0);
		cal.set(Calendar.SECOND, 0);
		cal.set(Calendar.MILLISECOND, 0);
	}

		final String DATE = "18.07.2012";
		DateFormat df = new SimpleDateFormat(DEFAULT_DATE_FORMAT);
		try {
			Date d = df.parse(DATE);
			Calendar cc = Calendar.getInstance();
			cc.setTime(d);
			Calendar c = Calendar.getInstance();
			trimCalendarToDay(c);
			if(cc.equals(c)){
				System.out.print(true);
			}
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}