Contact Form 7 expiration date and time

var d = new Date();
var time = d.getHours() + “:” + d.getMinutes() + “:” + d.getSeconds();
if(time > 21 && time < 9 )
$(‘.wpcf7-submit’).prop(‘disabled’, true);
else {
$(‘.wpcf7-submit’).prop(‘disabled’, false);
}

where should i place this code

in custom js or under <script></script> tag

yes but in contact form editor or i have to make a new js page or in additional settings