jquery add clss based on time

HTML

<div id="btn_1">Button 1</div>
<div id="btn_2">Button 2</div>
<div id="btn_3">Button 3</div>

CSS

.select {
   border: 2px solid red; 
}

JavaScript

$(function() {
    var hour = (new Date).getHours() -10;

    $('.select').removeClass('select');
    
    if (hour < 7) {
        $('#btn_1').addClass('select');
    } else if (hour < 11) {
        $('#btn_2').addClass('select');
    } else if (hour < 16) {
        $('#btn_3').addClass('select');
    }

})