JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.6/themes/ui-lightness/jquery-ui.css">
<input id="start" type="text" />
<input id="end" type="text" disabled="disabled" />

CSS

body {
    font-size: 12px;
}

input {
    padding: 3px;
}

JavaScript

function enableEnd() {
    end.attr('disabled', !this.value.length).datepicker('option', 'minDate', this.value);
}

var end = $('#end_date').datepicker();

$('#start_date').datepicker({
    onSelect: enableEnd
}).bind('input', enableEnd);