BetweenDates.java

public class Main {

    public static void main(String[] args) {

        List<String> afterdays = new ArrayList<String>();
        List<String> beforeDays = new ArrayList<String>();

        SimpleDateFormat df = new SimpleDateFormat( "dd-MM-yyyy" );

        // Set edilmediği sürece bugün tarihini döner.
        Calendar cal = Calendar.getInstance();
        int calday = (int) ( cal.getTimeInMillis() / ( 1000 * 60 * 60 * 24 ) );

        // After days
        Calendar sixMonthsLater = (Calendar) cal.clone();
        sixMonthsLater.add( Calendar.MONTH, 6 );
        int sixMonthsLaterDay = (int) ( sixMonthsLater.getTimeInMillis() / ( 1000 * 60 * 60 * 24 ) );

        for (int i = 0; i < sixMonthsLaterDay - calday; i++) {

            Calendar dayAfter = (Calendar) cal.clone();
            dayAfter.add( Calendar.DAY_OF_MONTH, i );
            afterdays.add( df.format( dayAfter.getTime() ) );

        }

        // Before days
        Calendar sixMonthsbefore = (Calendar) cal.clone();
        sixMonthsbefore.add( Calendar.MONTH, -6 );
        int sixMonthsBeforeDay = (int) ( sixMonthsbefore.getTimeInMillis() / ( 1000 * 60 * 60 * 24 ) );

        for (int i = 0; i < calday - sixMonthsBeforeDay; i++) {

            Calendar dayBefore = (Calendar) cal.clone();
            dayBefore.add( Calendar.DAY_OF_MONTH, -i );
            beforeDays.add( df.format( dayBefore.getTime() ) );

        }

    }
}