java 判断日期是否是同一天

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));
    }