$(function () {

    $("#howfun").hide();

});

id();

<!-- Jquery link-->
<script type="text/javascript" src="jquery-3.3.1.js"></script>

<h1 id="howfun">how fun</h1>
<div class="clock">
    <div class="clock-face" id="setdate">
        <div class="hand hour-hand" id="setdate1"></div>
        <div class="hand min-hand"></div>
        <div class="hand second-hand"></div>
    </div>
</div>