Hi sivanaidu,
It is not possible without ampm. You should use custom input time to do this work.
Use BootStrap TimePicker controll to do this.
HTML
<style type="text/css">
.bootstrap-timepicker-meridian, .meridian-column
{
display: none;
}
</style>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-timepicker/0.5.2/css/bootstrap-timepicker.min.css" />
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" />
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-timepicker/0.5.2/js/bootstrap-timepicker.min.js"></script>
<script type="text/javascript">
$(function () {
$('#timepicker').timepicker({
showMeridian: false,
showInputs: true
});
});
</script>
<input id="timepicker" type="text">
Demo