JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://www.kelvinluck.com/assets/jquery/datePicker/v2/demo/scripts/date.js"></script>
<script src="http://www.kelvinluck.com/assets/jquery/datePicker/v2/demo/scripts/jquery.datePicker.js"></script>
<input name="date2" id="date2" class="date-pick" value="Select date" />

CSS

table.jCalendar {
    border: 1px solid #000;
    background: #aaa;
    border-collapse: separate;
    border-spacing: 2px;
}
table.jCalendar th {
    background: #333;
    color: #fff;
    font-weight: bold;
    padding: 3px 5px;
}

table.jCalendar td {
    background: #ccc;
    color: #000;
    padding: 3px 5px;
    text-align: center;
}
table.jCalendar td.other-month {
    background: #ddd;
    color: #aaa;
}
table.jCalendar td.today {
    background: #666;
    color: #fff;
}
table.jCalendar td.selected {
    background: #f66;
    color: #fff;
}
table.jCalendar td.selected.dp-hover {
    background: #f33;
    color: #fff;
}
table.jCalendar td.dp-hover,
table.jCalendar tr.activeWeekHover td {
    background: #fff;
    color: #000;
}
table.jCalendar tr.selectedWeek td {
    background: #f66;
    color: #fff;
}
table.jCalendar td.disabled, table.jCalendar td.disabled.dp-hover {
    background: #bbb;
    color: #888;
}
table.jCalendar td.unselectable,
table.jCalendar td.unselectable:hover,
table.jCalendar td.unselectable.dp-hover {
    background: #bbb;
    color: #888;
}

/* For the popup */

/* NOTE - you will probably want to style a.dp-choose-date - see how I did it in demo.css */

div.dp-popup {
    position: relative;
    background: #ccc;
    font-size: 10px;
    font-family: arial, sans-serif;
    padding: 2px;
    width: 171px;
    line-height: 1.2em;
}
div#dp-popup {
    position: absolute;
    z-index: 199;
}
div.dp-popup h2 {
    font-size: 12px;
    text-align: center;
    margin: 2px 0;
    padding: 0;
}
a#dp-close {
    font-size: 11px;
    padding: 4px 0;
    text-align: center;
    display: block;
}
a#dp-close:hover {
    text-decoration: underline;
}
div.dp-popup a {
    color: #000;
    text-decoration: none;
    padding: 3px 2px 0;
}
div.dp-popup div.dp-nav-prev {
    position: absolute;
    top: 2px;
    left: 4px;
    width: 100px;
}
div.dp-popup div.dp-nav-prev a {
    float: left;
}
/* Opera needs the rules to be this specific otherwise it...

JavaScript

Date.prototype.formatMMDDYYYY = function(){
    return this.getDate() + 
    "/" +  (this.getMonth()+1) +
    "/" +  this.getFullYear();
}

$(document).ready(function(){
    var currentTime = new Date();
    var startDate = new Date(currentTime.getFullYear(), currentTime.getMonth(), 20).formatMMDDYYYY();
    var endDate = new Date(currentTime.getFullYear(), currentTime.getMonth()+1, 10).formatMMDDYYYY();
    $('.date-pick').datePicker({autoFocusNextInput: true,
                                startDate: startDate,
                                endDate: endDate});
});