JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.5.0/js/bootstrap-datepicker.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.5.0/css/bootstrap-datepicker.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<input id="openDatepick"></input>

JavaScript

var onlyThisDates = ['12/12/2018', '12/13/2018', '12/14/2018'];


$('#openDatepick').datepicker({
    format: "mm/dd/yyyy",
    startDate: "today",
    autoclose: true,
    beforeShowDay: function (date) {
        var dt_ddmmyyyy = (date.getMonth() + 1) + '/' + date.getDate() + '/' +  date.getFullYear();
        if (onlyThisDates.indexOf(dt_ddmmyyyy) != -1) {
            return {
                tooltip: 'This date is enabled',
                classes: 'active'
            };
        } else {
            return false;
        }
    }
});