JSFiddle - React, Tailwind, and code Playground

HTML

<div id="blue-colum" class="monthly-coupon-column">
    <ul>
        <li><img class="month-offer" src="images/monthly-online-offers/coupon-may-2014.png" width="312" height="240" alt="May 2014 Coupon" /></li>
        <li><img class="month-offer" src="images/monthly-online-offers/coupon-august-2014.png" width="312" height="240" alt="August 2014 Coupon" /></li>
        <li><img class="month-offer" src="images/monthly-online-offers/coupon-november-2014.png" width="312" height="240" alt="November 2014 Coupon" /></li>
        <li><img class="month-offer" src="images/monthly-online-offers/coupon-february-2015.png" width="312" height="240" alt="February 2015 Coupon" /></li>   
    </ul>
</div>
<div id="pink-colum" class="monthly-coupon-column">
    <ul>
        <li><img class="month-offer" src="images/monthly-online-offers/coupon-june-2014.png" width="312" height="240" alt="June 2014 Coupon" /></li>
        <li><img class="month-offer" src="images/monthly-online-offers/coupon-september-2014.png" width="312" height="240" alt="September 2014 Coupon" /></li>
        <li><img class="month-offer" src="images/monthly-online-offers/coupon-december-2014.png" width="312" height="240" alt="December 2014 Coupon" /></li>
        <li><img class="month-offer" src="images/monthly-online-offers/coupon-march-2015.png" width="312" height="240" alt="March 2015 Coupon" /></li>    
    </ul>   
</div>
<div id="green-colum" class="monthly-coupon-column">
    <ul>
        <li><img class="month-offer" src="images/monthly-online-offers/coupon-july-2014.png" width="312" height="240" alt="July 2014 Coupon" /></li>
        <li><img class="month-offer" src="images/monthly-online-offers/coupon-october-2014.png" width="312" height="240" alt="October 2014 Coupon" /></li>
        <li><img class="month-offer" src="images/monthly-online-offers/coupon-january-2015.png" width="312" height="240" alt="January 2015 Coupon" /></li>
        <li><img class="month-offer"...

CSS

.red { color: red; }

JavaScript

var dt = new Date();
var m = ['January', 'February', 'March', 
               'April', 'May', 'June', 'July', 
               'August', 'September', 'October', 'November', 'December'];

var month = m[dt.getMonth()]; //you get the idea...
var y = dt.getFullYear();


$(".monthly-coupon-column ul li img").each( function(i,v) { 
       var result = $(this).attr("alt").split(" ");

    if(result[0] == month && result[1] == y){
        $(this).addClass("red");
    }

});