How to add days into the date in android

Question

In my database I am getting start date like 2011-11-30(yyyy/mm/dd)format.and duration date like 40 days.How can i calculate the days and get new date format of mm/dd/yyyy.

Answer 1

Step-1 Get Calendar instance from the specified string

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Calendar c = Calendar.getInstance();
            c.setTime(sdf.parse(dateInString));

Step-2 use add() to add number of days to calendar

c.add(Calendar.DATE, 40); 

Step-3 Convert the dtae to the resultant date format

sdf = new SimpleDateFormat("MM/dd/yyyy");
            Date resultdate = new Date(c.getTimeInMillis());
            dateInString = sdf.format(resultdate);

Source Code

String dateInString = "2011-11-30";  // Start date
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.setTime(sdf.parse(dateInString));
        c.add(Calendar.DATE, 40);  
        sdf = new SimpleDateFormat("MM/dd/yyyy");
        Date resultdate = new Date(c.getTimeInMillis());
        dateInString = sdf.format(resultdate);
        System.out.println("String date:"+dateInString);