Try compare dates changing to 00:00:00 its time (as this function do):
public static Date getZeroTimeDate(Date fecha) {
Date res = fecha;
Calendar calendar = Calendar.getInstance();
calendar.setTime( fecha );
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);
res = calendar.getTime();
return res;
}
Date currentDate = new Date();// get current date
Date eventDate = tempAppointments.get(i).mStartDate;
int dateMargin = getZeroTimeDate(currentDate).compareTo(getZeroTimeDate(eventDate));