Edit in JSFiddle

$(function () {
    $.livestamp.interval(30*1000);
    $('#add').click(function (e) {
        $('#stamps').append('<p><span data-livestamp="' + Math.round(Date.now()/1000) + '"></span></p>');
        $.livestamp.resume();
    });
});

<p><button id='add'>add</button> a live time stamp in the following div. </p>
<div id='stamps'></div>