how to add number of days to the date given in a jtextfield with string data type

Question

Good Day . I just wanna ask about adding days in a given date. I have a jtexfield (txtStart) and another jtexfield(txtExpiry). I need to display in txtExpiry the date after 102 days from the date in txtStart. I am using KEYRELEASED event. after i input in txtStart, the date with additional 102 days shall appear in txtExpiry. here's my code but it's still erroneous. ``` private void txtStartKeyReleased(java.awt.event.KeyEvent evt) { // TODO add your handling code here: // set calendar to 1 Jan 2007 int a = Integer.parseInt(txtStart.getText()); Calendar calendar = new GregorianCalendar(a,a,a); calendar.add(Calendar.DAY_OF_MONTH,102); PrintCalendar(calendar); } private void PrintCalendar(Calendar calendar){ // define output format and print SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd"); String date = sdf.format(calendar.getTime()); long add = Date.parse(date); txtExpiry.setText(add); -----> this part here also has an error. } ``` my code still won't generate the date in txtEx…

Accepted Answer

Use

```
yyyy-MM-dd
```

Note: Capital MM

See : `SimpleDateFormat`

Now, once you have the date instance you could use `Calendar` to do the days arithmetic

```
Calendar cal = Calendar.getInstance();
cal.setTime(parsedDate);
cal.add(Calendar.DATE, 102);
String expDateString = dateFormatter.format(cal.getTime());
```

how to add number of days to the date given in a jtextfield with string data type

Solution

Problem