public static Long getDaysBetween(long startDate, long endDate) {

Calendar fromCalendar = Calendar.getInstance();

fromCalendar.setTimeInMillis(startDate);

fromCalendar.set(Calendar.HOUR_OF_DAY, 0);

fromCalendar.set(Calendar.MINUTE, 0);

fromCalendar.set(Calendar.SECOND, 0);

fromCalendar.set(Calendar.MILLISECOND, 0);

Calendar toCalendar = Calendar.getInstance();

toCalendar.setTimeInMillis(endDate);

toCalendar.set(Calendar.HOUR_OF_DAY, 0);

toCalendar.set(Calendar.MINUTE, 0);

toCalendar.set(Calendar.SECOND, 0);

toCalendar.set(Calendar.MILLISECOND, 0);

return (toCalendar.getTime().getTime() - fromCalendar.getTime().getTime()) / (1000 * 60 * 60 * 24);

}