SO - 15481326

by Arun P Johny

HTML

<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.9.2/jquery-ui.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.9.2/themes/redmond/jquery-ui.css">
<input id="p1"><input id="p2">

JavaScript

$('#p1, #p2').datepicker();

$('#p1').change(function(){
    $('#p2').datepicker('option', 'minDate', $('#p1').datepicker('getDate'))
})