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Calendar calendar1 = Calendar.getInstance();

SimpleDateFormat sdf1 = new SimpleDateFormat("yyyyMMdd");

calendar1.add(Calendar.DATE, -3);

String three_days_ago = sdf1.format(calendar1.getTime());

System.out.println(three_days_ago);

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Calendar calendar2 = Calendar.getInstance();

SimpleDateFormat sdf2 = new SimpleDateFormat("yyyyMMdd");

calendar2.add(Calendar.DATE, 3);

String three_days_after = sdf2.format(calendar2.getTime());

System.out.println(three_days_after);