Convert Json date to java date

by 
JSONObject store = new JSONObject(response);
if(store.has("CreatedOn")) {
  Timestamp stamp = new Timestamp(store.getLong("CreatedOn"));
  Date date = new Date(stamp.getTime());
  System.out.println(date);
}

or

JSONObject store = new JSONObject(response);
if(store.has("CreatedOn")) {
Integer datetimestamp = Integer.parseInt(store.getString("CreatedOn").replaceAll("\\D", ""));
 Date date = new Date(datetimestamp);
 DateFormat formatter = new SimpleDateFormat("HH:mm:ss:SSS");
 String dateFormatted = formatter.format(date);
}

consider using JSON methods instead of contains. JSON has “has()” which validate if key exists.

You should also make sure that you try {} catch {} the String first, to make sure its valid JSON.

Update:

Your Value is
/Date(1406192939581)/

which means it must be formatted first.
Get it by parsing the string with 

Integer datetimestamp = Integer.parseInt(store.getString("CreatedOn").replaceAll("\\D", ""));

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