1.Download necessary files from here

2.Copy all the required files to css,less and js of your codeigniter folder..

3. Add the following lines to your php file..

<link rel=”stylesheet” type=”text/css” href=”<?php echo base_url().’css/datepicker.css’?>”/>
<link rel=”stylesheet/less” type=”text/css” href=”<?php echo base_url().’less/datepicker.less’?>” />

<script src=”<?php echo base_url().’js/bootstrap-datepicker.js’?>”></script>

4. Add this code in php file..

<div class=”input-append date” id=”datepicker” data-date=”” data-date-format=”dd-mm-yyyy” >
<input class=”span2″ size=”16″ type=”text” value=”” disabled>
<span class=”add-on”><i class=”icon-th”></i></span>
</div>

<script>
$(‘#datepicker’).datepicker();
</script>

Now execute your php file and verify the date picker is working or not?? simple.. 😉

Try this too or use HTML5 date