Try this fiddle
$(function() {
$('#datepicker').datepicker({
dateFormat: 'yy-dd-mm',
onSelect: function(datetext) {
var d = new Date(); // for now
var h = d.getHours();
h = (h < 10) ? ("0" + h) : h ;
var m = d.getMinutes();
m = (m < 10) ? ("0" + m) : m ;
var s = d.getSeconds();
s = (s < 10) ? ("0" + s) : s ;
datetext = datetext + " " + h + ":" + m + ":" + s;
$('#datepicker').val(datetext);
}
});
});