工具集_是否是同一天

 public static boolean isTheSameDay(Date d1,Date d2) {  
        Calendar c1 = Calendar.getInstance();  
        Calendar c2 = Calendar.getInstance();  
        c1.setTime(d1);  
        c2.setTime(d2);  
        return (c1.get(Calendar.YEAR) == c2.get(Calendar.YEAR))  
                && (c1.get(Calendar.MONTH) == c2.get(Calendar.MONTH))  
                && (c1.get(Calendar.DAY_OF_MONTH) == c2.get(Calendar.DAY_OF_MONTH));  
    }