JSFiddle - React, Tailwind, and code Playground

HTML

<div class="post" data-post_day="20160406">2015 04 22</div>
<div class="post" data-post_day="20150422">2015 04 22</div>
<div class="post" data-post_day="20150422">2015 04 22</div>
<div class="post" data-post_day="20150415">2015 04 15</div>
<div class="post" data-post_day="20150415">2015 04 15</div>
<div class="post" data-post_day="20150414">2015 04 14</div>
<div class="post" data-post_day="20150413">2015 04 13</div>
<div class="post" data-post_day="20150413">2015 04 13</div>
<div class="post" data-post_day="20150412">2015 04 12</div>
<div class="post" data-post_day="20150411">2015 04 11</div>

CSS

.post {
    background: #E9F7FF;
    border: 1px solid #9AC7E0;
    -webkit-border-radius: 2px;
    -moz-border-radius: 2px;
    border-radius: 2px;
    color: #4281A5;
    margin: 10px 5px;
    padding: 5px;
    position: relative;
    text-align: center;
    min-height: 50px;
}
.post.post_exclusive {
    background: #FEE1D3;
    border: 1px solid #FE6D1E;
    -webkit-box-shadow: 0 2px 2px rgba(0, 0, 0, 0.25);
    -moz-box-shadow: 0 2px 2px rgba(0, 0, 0, 0.25);
    box-shadow: 0 2px 2px rgba(0, 0, 0, 0.25);
    color: #C44002;
}
.ico_exclusive {
    background-image:...

JavaScript

$(document).ready(function () {
    $(function () {
        var date = new Date(),
            today = '',
            yaer = date.getFullYear().toString(),
            month = Number(date.getMonth()) + 1,
            day = date.getDate().toString();
        if (month < 10) {
            month = '0' + month;
        }
        month = month.toString();
        today = yaer + month + day;
        $('[data-post_day="' + today + '"]').addClass('post_exclusive').prepend('<div class="ico_exclusive"></div>');
    });
});