How to convert string into date in the format of yyyy-MM-dd and storing it in databse

Question

This is the code what I have done but the date is not getting stored in the same format as the manufacturing date in the database (yyyy-MM-dd)

This calculates the expiry date for the Item:

   public   void calculateExpiryDate(List<Item> items)//to calculate expiry date
   {
     System.out.println("Calculate expiry");

     try
     {// to get the data one by one and calculate its expiry date
       for(Item ob : items)
       {
       Item i1 = (Item)ob;
       Date dd = (Date)i1.getManufacturingDate();
       int  m = i1.getUseBeforeMonths();
       SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
       String date = sdf.format(dd);
       String d[] = date.split("-");
       d[1]=String.valueOf(Integer.parseInt(d[1])+m);
       // loop to calculate expiry date
       while(Integer.parseInt(d[1])>12)
       {
            d[1] = String.valueOf(Integer.parseInt(d[1])-12);
            d[0] = String.valueOf(Integer.parseInt(d[0])+1);
       }
       String d1 =d[0]+"-"+d[1]+"-"+d[2];


       Date dt = (Date)sdf.parse(d1);//converting string into date
       i1.setExpiryDate(dt);//setting the expiry date into the database
       System.out.println(i1.getExpiryDate());
       }
     }
     catch(Exception e)
     {
          e.printStackTrace();
     }



   }

Answer 1

A Date does not have a format, since it is a time measured since 1970. If we are speaking about format, then we speak about how date is displayed, which is a different issue. Naturally, you need to change the format of "yyyy-mm-dd" to "yyyy-MM-dd" , but, again: 1st July 2015 is the same date as 2015-07-01. The difference is being on the way it is displayed. Needless to say, a huge part of your code is not needed. You just need to create a date from the String, do whatever you need to do and then display the date in your preferred format.