JSFiddle - React, Tailwind, and code Playground

HTML

<div class="details">
                        <a href="/pages/viewpage.action?pageId=78546703">08/19 - 12/31: EPP 20% (on GS8/S8+/S8 Active, Note8 &amp; CPO)</a>
                                         <span class="smalltext">(Merchandizing)</span>

            </div>

        <div class="details">
<a href="/pages/viewpage.action?pageId=78566946">08/20: SUNSETTING - App Exclusive - Inflated Trade-in Offer</a>
                                         <span class="smalltext">(Merchandizing)</span>
             
             </div>

JavaScript

$(function () {
    $('a:contains(": SUNSETTING")').css('background-color', 'LightCoral');
});


$(function () {
		var today = new Date();
var dd = today.getDate();
var mm = today.getMonth()
    $('a:contains("SUNSETTING")').text(mm + "/" + dd);
});

$(function () {
		var today = new Date();
var dd = today.getDate();
var mm = today.getMonth()
var test = mm + "/" + dd + ": SUNSETTING";
    $('a:contains(test)').css('background-color', 'Red');
});