[SOLVED] How to get the date difference between two jalali date (persianDatepicker) on clicking the second input date picker?

How to get the date difference between two jalali date (persianDatepicker) on clicking the second input date picker?

I use this https://github.com/behzadi/persianDatepicker script to show jalali date

I select date1 and date2 to from datepicker to my input

Code

$(document).ready(function() {
  $('.example').persianDatepicker({
    format: 'YYYY/MM/DD',
    observer: true,
    altField: '.observer-example-alt',
    autoClose: true,
  });
});

html,
body {
  font-family: sans-serif;
  padding: 0.5rem;
  margin: 0;
}

label {
  display: block;
  margin-top: 0.5rem;
}

<strong>Persian Date Difference</strong>
<label for="start-date">Start Date</label>
<input id="start-date" class="example" name="start-date" />
<label for="stop-date">Stop Date</label>
<input id="end-date" class="example" name="end-date" />
<label for="diff">Difference</label>
<input id="diff" class="diff" name="diff" />

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<!--  https://github.com/behzadi/persianDatepicker -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/Behzadi/persianDatepicker/css/persianDatepicker-default.css">
<script src="https://cdn.jsdelivr.net/gh/Behzadi/persianDatepicker/js/persianDatepicker.js"></script>

I want when I select date1 (id="start-date") and date 2 (id="end-date") it will immediately display in (id="diff") the difference between the two jalali dates

for example 1

date1= 1403/06/06 
date2= 1403/06/06

result:

1 day

example 2

date1= 1403/06/06 
date2= 1403/06/07

result:

2 days

i dont add what add in my javascript to earn my result

<script>
??????
??????
</script>

Solution