how to disable the previous dates from boot strap datepicker

Question

<script type='text/javascript'>

$(window).load(function () {

$('#<%=txtDOE.ClientID%>').each(function () {

var $picker = $(this);

$picker.datepicker();

var pickerObject = $picker.data('datepicker');

$picker.on('changeDate', function (ev) {

$picker.datepicker('hide');

});

});

});

</script>