Expected behavior I get date through AJAX with format yyyy/mm/dd (2021/05/05) , when I open the calendar I want see May 5, 2021 selected in the calendar

Actual behavior Always appear today date, if sent the form, hidden submit variable is empty.

Resources (screenshots, code snippets etc.) HTML

<div id="datepp" class="md-form md-outline input-with-post-icon datepicker">
<input placeholder="Select date" type="text" id="datep" name="datep" class="form-control">
<label for="example">Date</label>
<i class="fas fa-calendar input-prefix" tabindex=0></i>
</div>

JS

$('.datepicker').datepicker({format: 'yyyy/mm/dd', formatSubmit: 'yyyy/mm/dd', min: [2020,10,1], max: [2021,09,31]});
$("#datep").val("2021/05/05")  
$("#datep").datepicker("update", new Date(2021,05,05));

2021/05/05 is get from web server through AJAX, I put the value as example