verify.js

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>

<script>

var Webflow = Webflow || [];

Webflow.push(function () {

    let now;
    let expire;

    let permission = localStorage.getItem('wfPermission');
    let visitStamp = moment().format('YYYY-MM-DD');
    let getExpiry = localStorage.getItem('expiration');
    let comparison = moment(visitStamp).isBefore(getExpiry);

    if (permission == 'TRUE' && comparison == true) {
        $("#modal").hide();
    }
    else {
        $("#modal").show();
    }

    $("#btnYes").click(function () {

        now = moment().format('YYYY-MM-DD');
        expire = moment().add(30, 'days').calendar();
        expire = moment(expire).format('YYYY-MM-DD');

        localStorage.setItem('wfPermission', 'TRUE');
        localStorage.setItem('timestamp', now);
        localStorage.setItem('expiration', expire);

    });

    $("#btnNo").click(function () {
        now = moment().format('YYYY-MM-DD');

        localStorage.setItem('wfPermission', 'FALSE');
        localStorage.setItem('timestamp', now);

        $("#ageInfo").hide();
        $("#ageRestrict").show();
    });
    
});

</script>