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Calendar now = Calendar.getInstance();
String dt="31012013";
now.set(Integer.parseInt(dt.substring(4)),Integer.parseInt(dt.substring(2,4)),Integer.parseInt(dt.substring(0,2)));
now.add(Calendar.DATE, 89);
String matdate=Integer.toString(now.get(Calendar.DATE))+ "/"+ (now.get(Calendar.MONTH) ) +"/" + now.get(Calendar.YEAR);