disable past dates on datepicker

How to disable past dates from the current date on a datetimepicker? I tried few posts for similar question but was unable to achieve it, Below is what I tried

<link href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap-combined.min.css" rel="stylesheet">
<link rel="stylesheet" type="text/css" media="screen"
 href="http://tarruda.github.com/bootstrap-datetimepicker/assets/css/bootstrap-datetimepicker.min.css">
<script type="text/javascript"
 src="http://cdnjs.cloudflare.com/ajax/libs/jquery/1.8.3/jquery.min.js">
</script> 
<script type="text/javascript"
 src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/js/bootstrap.min.js">
</script>
<script type="text/javascript"
 src="http://tarruda.github.com/bootstrap-datetimepicker/assets/js/bootstrap-datetimepicker.min.js">
</script>
<script type="text/javascript"
 src="http://tarruda.github.com/bootstrap-datetimepicker/assets/js/bootstrap-datetimepicker.pt-BR.js">
</script>
<script type="text/javascript">
$(function() {
  $('#datetimepicker2').datetimepicker({
    language: 'en',
    pick12HourFormat: true
  });
});
</script>

<div id="datetimepicker2" class="input-append">
<input data-format="MM/dd/yyyy" type="text"/>
<span class="add-on">
  <i  data-date-icon="icon-calendar">
  </i>
</span>

I also tried

$("datetimepicker2").datepicker({ changeYear: true, dateFormat: 'dd/mm/yy', showOn: 'none', showButtonPanel: true,  minDate:'0d' }); 

and

$("#datetimepicker2").datepicker({ minDate: 0 });

Give zero to mindate and it'll disabale past dates.

$( "#datepicker" ).datepicker({ minDate: 0});

here is a Live fiddle working example http://jsfiddle.net/mayooresan/ZL2Bc/

The official documentation is available here

Problem fixed :)

below is the working code

$(function(){
    $('#datepicker').datepicker({
        startDate: '-0m'
        //endDate: '+2d'
    }).on('changeDate', function(ev){
        $('#sDate1').text($('#datepicker').data('date'));
        $('#datepicker').datepicker('hide');
    });

})

minDate: dateToday Or minDate: '0' is the key here. Try to set the minDate property.

$(function() {
    $( "#datepicker" ).datepicker({
        numberOfMonths: 2,
        showButtonPanel: true,
        minDate: dateToday // minDate: '0' would work too
    });
});

Read more

try this,

$( "#datepicker" ).datepicker({ minDate: new Date()});

Here, new Date() implies today's date....