Date generate from start to end date in java

Question

I am trying to generate a list of dates from a given start and end date. I found the solution in stack overflow . But, the code gives the distribution starting from the month of January. I am unable to find why. Please help me out.

starting , ending are String with format 'yyyy-mm-dd' . duration is the Arraylist I am using to store the dates.

List<Date> duration = new ArrayList<Date>();
         List<Date> date_req = new ArrayList<Date>();
            Calendar start = Calendar.getInstance();


        DateFormat formatter = new SimpleDateFormat("yyyy-mm-dd");
        Date date_st = formatter.parse(starting);
        Date date_en = formatter.parse(ending);

            int init=0;
            start.setTime(date_st);
            Calendar end = Calendar.getInstance();
            end.setTime(date_en);
            end.add(Calendar.DAY_OF_YEAR, 1); //Add 1 day to endDate to make sure endDate is included into the final list
            while (start.before(end)) {
                duration.add(init,start.getTime());
                start.add(Calendar.DAY_OF_YEAR, 1);
                init=init+1;
            }
          System.out.println(duration); 

Thanks.

Answer 1

Your format should be DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd")

Using mm for Month is the reason you get your year starting from JAN

Answer 2

mm代表分钟，几个月则必须使用MM 。

Answer 3

Your code works with minor changes as below:

public static void main(String[] args) throws ScriptException,
            FileNotFoundException, ParseException {
        List<Date> duration = new ArrayList<Date>();


        String starting = "2014-04-01";
        String ending = "2014-04-30";

        DateFormat formatter = new SimpleDateFormat("yyyy-mm-dd");
        Date date_st = formatter.parse(starting);
        Date date_en = formatter.parse(ending);

        int init = 0;
        Calendar start = Calendar.getInstance();
        start.setTime(date_st);
        Calendar end = Calendar.getInstance();
        end.setTime(date_en);
        end.add(Calendar.DAY_OF_YEAR, 1); // Add 1 day to endDate to make sure
                                            // endDate is included into the
                                            // final list
        while (start.before(end)) {
            duration.add(start.getTime());
            start.add(Calendar.DAY_OF_YEAR, 1);
        }

        for (Date date : duration) {
            System.out.println(date);
        }

    }