Remove the quotes surrounding 0
and it will work.
Working Code Snippet:
// set minDate to 0 for today's date_x000D_
$('#datepicker').datepicker({ minDate: 0 });
_x000D_
body {_x000D_
font-size: 12px; /* just so that it doesn't default to 16px (which is kinda huge) */_x000D_
}
_x000D_
<!-- load jQuery and jQuery UI -->_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>_x000D_
_x000D_
<!-- load jQuery UI CSS theme -->_x000D_
<link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/smoothness/jquery-ui.css">_x000D_
_x000D_
<!-- the datepicker input -->_x000D_
<input type='text' id='datepicker' placeholder='Select date' />
_x000D_