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);
}

I have this code but where should i place it. The above code is for time period functionality.

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