How to put dynamic datepicker value?

Question

Working with date/time

Trying to write a script for the minimum date datepicker:

var newdate = parseInt(document.getElementById('nmber1').value);
$( "input#shipping_data" ).datepicker({
dateFormat: "dd.mm.yy",
minDate: newdate,
});


from this field:

<Input class="did" value="06/06/2020" id="nmber1"/>

should pull out value and substitute it for minDate, but it doesn't work((
What's wrong?